Patent application number | Description | Published |
20130107953 | RANDOM ACCESS WITH ADVANCED DECODED PICTURE BUFFER (DPB) MANAGEMENT IN VIDEO CODING | 05-02-2013 |
20130163668 | PERFORMING MOTION VECTOR PREDICTION FOR VIDEO CODING - In general, techniques are described for performing motion vector prediction for video coding. A video coding device comprising a processor may perform the techniques. The processor may be configured to determine a plurality of candidate motion vectors for a current block of the video data so as to perform the motion vector prediction process and scale one or more of the plurality of candidate motion vectors determined for the current block of the video data to generate one or more scaled candidate motion vectors. The processor may then be configured to modify the scaled candidate motion vectors to be within a specified range. | 06-27-2013 |
20130170553 | CODING MOTION VECTOR DIFFERENCE - The techniques described in this disclosure may be generally related to identifying when motion vector difference (MVD) is skipped for one or both reference picture lists. The techniques may further relate to contexts for signaling MVD values. The techniques may also be related to syntax that indicates when at least one of the MVD values is zero. | 07-04-2013 |
20130177070 | SIGNIFICANCE MAP SUPPORT FOR PARALLEL TRANSFORM COEFFICIENT PROCESSING IN VIDEO CODING - In an example, aspects of this disclosure relate to a process for video coding that includes determining that a set of support for selecting a context model to code a current significant coefficient flag of a transform coefficient of a block of video data includes at least one significant coefficient flag that is not available. The process also includes, based on the determination, modifying the set of support, and calculating a context for the current significant coefficient flag using the modified set of support. The process also includes applying context-adaptive binary arithmetic coding (CABAC) to code the current significant coefficient flag based on the calculated context. | 07-11-2013 |
20130177083 | MOTION VECTOR CANDIDATE INDEX SIGNALING IN VIDEO CODING - A video encoder generates a first and a second candidate list. The first candidate list includes a plurality of motion vector (MV) candidates. The video encoder selects, from the first candidate list, a MV candidate for a first prediction unit (PU) of a coding unit (CU). The second MV candidate list includes each of the MV candidates of the first MV candidate list except the MV candidate selected for the first PU. The video encoder selects, from the second MV candidate list, a MV candidate for a second PU of the CU. A video decoder generates the first and second MV candidate lists in a similar way and generates predictive sample blocks for the first and second PUs based on motion information of the selected MV candidates. | 07-11-2013 |
20130182757 | THROUGHPUT IMPROVEMENT FOR CABAC COEFFICIENT LEVEL CODING - This disclosure proposes various techniques for limiting the number of bins that are coded using an adaptive context model with context adaptive binary arithmetic coding (CABAC). In particular, this disclosure proposes to limit the number of bins that use CABAC for coding level information of transform coefficients in a video coding process. | 07-18-2013 |
20130188698 | COEFFICIENT LEVEL CODING - In one example, a device includes a video coder configured to code a first set of syntax elements for the coefficients of a residual block of video data, and code, using at least a portion of the first set of syntax elements as context data, a second set of syntax elements for the coefficients, wherein the first set of syntax elements each correspond to a first type of syntax element for the coefficients, and wherein the second set of syntax elements each correspond to a second, different type of syntax element for the coefficients. For example, the first set of syntax elements may comprise values indicating whether the coefficients are significant (that is, have non-zero level values), and the second set of syntax elements may comprise values indicating whether level values for the coefficients have absolute values greater than one. | 07-25-2013 |
20130188699 | CODING OF COEFFICIENTS IN VIDEO CODING - A video encoder performs multiple coding passes on coefficients in a coefficient block. During each coding pass, the video encoder encodes a different set of syntax elements for coefficients in the coefficient block. A video decoder uses the syntax elements for a coefficient to determine the value of the coefficient. When the video encoder performs a coding pass, the video encoder selects a coding context for a syntax element based at least in part on a syntax element generated in an earlier coding pass for a non-causal coefficient and based at least in part on a value of a syntax element generated during the current coding pass for a causal coefficient. The video encoder entropy encodes the syntax element based on the selected coding context. A video decoder performs a similar series of coding passes in which the video decoder selects coding contexts and entropy decodes the syntax elements. | 07-25-2013 |
20130188715 | DEVICE AND METHODS FOR MERGE LIST REORDERING IN VIDEO CODING - A video coding device configured according to some aspects of this disclosure includes a memory configured to store an initial list of motion vector candidates and a temporal motion vector predictor (TMVP). The video coding device also includes a processor in communication with the memory. The processor is configured to obtain a merge candidate list size value (N) and identify motion vector candidates to include in a merge candidate list having a list size equal to the merge candidate list size value. The merge candidate list may be a merge motion vector (MV) candidate list or a motion vector predictor (MVP) candidate list (also known as an AMVP candidate list). The processor generates the merge candidate list such that the merge candidate list includes the TMVP, regardless of the list size. | 07-25-2013 |
20130188716 | TEMPORAL MOTION VECTOR PREDICTOR CANDIDATE - The techniques of this disclosure may be generally related to temporal motion vector prediction candidate. A video coder may determine a temporal motion vector prediction candidate for a plurality of blocks only once. Each of the plurality of blocks may include different spatial motion vector prediction candidates, but the temporal motion vector prediction candidate for the plurality of blocks may be the same. | 07-25-2013 |
20130188720 | VIDEO CODING USING PARALLEL MOTION ESTIMATION - An example video encoder is configured to receive an indication of merge mode coding of a block within a parallel motion estimation region (PMER), generate a merge mode candidate list comprising one or more spatial neighbor motion vector (MV) candidates and one or more temporal motion vector prediction (TMVP) candidates, wherein motion information of at least one of the spatial neighbor MV candidates is known to be unavailable during coding of the block at an encoder, determine an index value identifying, within the merge mode candidate list, one of the TMVP candidates or the spatial neighbor MV candidates for which motion information is available during coding of the particular block, and merge mode code the block using the identified MV candidate. | 07-25-2013 |
20130195189 | IMPLICIT DERIVATION OF PARALLEL MOTION ESTIMATION RANGE SIZE - A method for decoding video data is described. The method may comprise receiving an indication of a size of a parallel motion estimation (PME) area, performing a motion vector prediction process on coding units having a size smaller than or equal to the PME area using a PME style candidate list construction process and the PME area, deriving an implicit PME area for coding units having a size larger than the PME area, and performing the motion vector prediction process on coding units having the size larger than the PME area using the PME style candidate list construction process and the implicit PME area. | 08-01-2013 |
20130230097 | SCAN-BASED SLIDING WINDOW IN CONTEXT DERIVATION FOR TRANSFORM COEFFICIENT CODING - A video coding process that includes defining a context derivation neighborhood for one of a plurality of transform coefficients based on a transform coefficient scan order. The process also includes determining a context for the one of the plurality of transform coefficients based on the context derivation neighborhood. The process also includes coding the one of the plurality of transform coefficients based on the determined context. | 09-05-2013 |
20130272380 | GROUPING BYPASS CODED SYNTAX ELEMENTS IN VIDEO CODING - A video encoding device is configured to generate a first group of syntax elements. Each syntax element in the first group indicates whether a prediction mode of a respective prediction unit (PU) is based on an index into a list of most probable modes. A second group of syntax elements is generated that correspond to respective syntax elements in the first group. The syntax elements in the second group identify either an index into the list of most probable modes or an intra-prediction mode. The first group of syntax elements are context adaptive binary arithmetic coding (CABAC) encoded, and the second group of syntax elements are bypass encoded. A video decoder is configured to receive the entropy encoded first and second groups of syntax elements. The video decoder CABAC decodes the first group of flags and bypass decodes the second group of flags. | 10-17-2013 |
20130272409 | BANDWIDTH REDUCTION IN VIDEO CODING THROUGH APPLYING THE SAME REFERENCE INDEX - Techniques for encoding and decoding video data are described. A method of coding video may include determining a plurality of motion vector candidates for a block of video data for use in a motion vector prediction process, wherein each of the motion vector candidates points to a respective reference frame index, performing the motion vector prediction process using the motion vector candidates to determine a motion vector for the block of video data, and performing motion compensation for the block of video data using the motion vector and a common reference frame index, wherein the common reference frame index is used regardless of the respective reference frame index associated with the determined motion vector. | 10-17-2013 |
20130272410 | MOTION VECTOR ROUNDING - A video decoder determines, based at least in part on a size of a prediction unit (PU), whether to round either or both a horizontal or a vertical component of a motion vector of the PU from sub-pixel accuracy to integer-pixel accuracy. The video decoder generates, based at least in part on the motion vector, a predictive sample block for the PU and generates, based in part on the predictive sample block for the PU, a reconstructed sample block. | 10-17-2013 |
20130272414 | GROUP FLAG IN TRANSFORM COEFFICIENT CODING FOR VIDEO CODING - A method of decoding data indicative of a subset of transform coefficients is described. The coefficients are indicative of a block of video data. The method may include determining that no transform coefficient in the subset of transform coefficients has an absolute value greater than one, and, based on the determining, skipping one or more decoding passes on the subset of transform coefficients, the decoding passes relating to decoding level information associated with the subset of transform coefficients. | 10-17-2013 |
20130272423 | TRANSFORM COEFFICIENT CODING - Techniques are described for determining a scan order for transform coefficients of a block. The techniques may determine context for encoding or decoding significance syntax elements for the transform coefficients based on the determined scan order. A video encoder may encode the significance syntax elements and a video decoder may decode the significance syntax elements based on the determined contexts. | 10-17-2013 |
20130272424 | SIGN HIDING TECHNIQUES FOR QUANTIZED TRANSFORM COEFFICIENTS IN VIDEO CODING - This disclosure proposes techniques for encoding and decoding transform coefficients in a video coding process. In particular, this disclosure proposes techniques determining whether or not to apply a sign data hiding process for a group of transform coefficients, and techniques for applying the sign data hiding process. In one example, this disclosure describes a method for decoding video data comprising determining a block of transform coefficients, determining whether to perform a sign data hiding process for at least one transform coefficient in the block of transform coefficients based on a single variable compared to a threshold, and decoding sign information for the block based on the determination of whether to perform the sign data hiding process. | 10-17-2013 |
20130322531 | EXTERNAL PICTURES IN VIDEO CODING - A video encoder generates a syntax element that indicates whether a video unit of a current picture is predicted from an external picture. The external picture is in a different layer than the current picture. Furthermore, the video encoder outputs a video data bitstream that includes a representation of the syntax element. The video data bitstream may or may not include a coded representation of the external picture. A video decoder obtains the syntax element from the video data bitstream. The video decoder uses the syntax element in a process to reconstruct video data of a portion of the video unit. | 12-05-2013 |
20130329782 | ADAPTIVE UPSAMPLING FILTERS - In one embodiment, a video coder for coding video data includes a processor and a memory. The processor selects a filter set from a multiple filter sets for upsampling reference layer video data based at least on a prediction operation mode for enhanced layer video data and upsamples the reference layer video data using the selected filter set. Some of the multiple filter sets have some different filter characteristics from one another, and the upsampled reference layer video data has the same spatial resolution as the enhanced layer video data. The processor further codes the enhanced layer video data based at least on the upsampled reference layer video data and the prediction operation mode. The memory stores the upsampled reference layer video data. | 12-12-2013 |
20130329806 | BI-LAYER TEXTURE PREDICTION FOR VIDEO CODING - In one example, an apparatus is configured to code video data. The apparatus comprises a processor configured to determine a base layer reference block for a current block. The base layer reference block may be located in the base layer. The processor is further configured to determine an enhancement layer reference block for the current block. The enhancement layer reference block may comprise a weighted sum of a first reference block located in the enhancement layer and a second reference block located in the enhancement layer. The processor is further configured to determine a reference block from the base layer reference block and the enhancement layer reference block. | 12-12-2013 |
20130336394 | INFERRED BASE LAYER BLOCK FOR TEXTURE_BL MODE IN HEVC BASED SINGLE LOOP SCALABLE VIDEO CODING - An apparatus for coding video data using a single-loop decoding approach may include a memory unit and a processor in communication with the memory unit. In an embodiment, the memory unit stores the video data, the video data including a base layer and an enhancement layer. The base layer includes a base layer block, a non-constrained INTRA mode block, and an INTER mode block. The base layer block includes a sub-block located at least partially within one of the non-constrained INTRA mode block or the INTER mode block. The enhancement layer includes an enhancement layer block located at a position in the enhancement layer corresponding to a position of the base layer block in the base layer. The processor approximates pixel values of the sub-block and determines, based at least in part on the approximated pixel values, pixel values of the enhancement layer block. | 12-19-2013 |
20140010280 | INTRA MODE EXTENSIONS FOR DIFFERENCE DOMAIN INTRA PREDICTION - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores difference video information associated with a difference video layer of pixel information derived from a difference between an enhancement layer and a corresponding base layer of the video information. The processor determines a DC prediction value for a video unit associated with the difference video layer while refraining from using pixel information from a neighboring area of the video unit, wherein the DC prediction value is equal to zero or is offset by an offset value. The DC prediction value is a prediction value used in intra prediction based at least on an average of neighboring video units of the video unit. The processor further determines a value of the video unit based at least in part on the DC prediction value. | 01-09-2014 |
20140010292 | SKIP TRANSFORM AND RESIDUAL CODING MODE EXTENSION FOR DIFFERENCE DOMAIN INTRA PREDICTION - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores difference video information associated with a difference video layer of pixel information derived from a difference between an enhancement layer and a corresponding base layer of the video information. The processor determines a value of a video unit based on the difference video layer. The processor is further configured to refrain from performing a transform and residual coding of the determined value of the video unit. | 01-09-2014 |
20140010300 | SMOOTHING OF DIFFERENCE REFERENCE PICTURE - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores difference video information associated with a difference video layer of pixel information derived from a difference between an enhancement layer and a corresponding base layer of the video information. The processor determines a value of a video unit based on a reference video unit or spatial neighboring video unit within the difference video layer and applies a smoothing filter to the reference video unit or spatial neighboring video unit. | 01-09-2014 |
20140010310 | MOTION VECTOR DIFFERENCE CODING EXTENSION FOR ENHANCEMENT LAYER - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores difference video information associated with a difference video layer of pixel information derived from a difference between an enhancement layer and a corresponding base layer of the video information. The processor determines pixel accuracy of motion predictor information, determines a motion vector based on the pixel accuracy of the motion predictor information, and determines a value of a video unit based at least in part on the motion vector. | 01-09-2014 |
20140015925 | GENERALIZED RESIDUAL PREDICTION FOR SCALABLE VIDEO CODING AND 3D VIDEO CODING - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores video information of a reference layer. The processor determines a value of a video unit based at least in part on a prediction value and an adjusted residual prediction value associated with the reference layer. The adjusted residual prediction value is equal to a residual prediction from the reference layer multiplied by a weighting factor that is different from 1. | 01-16-2014 |
20140044161 | ADATIVE UP-SAMPLING FILTER FOR SCALABLE VIDEO CODING - Methods and systems for video image coding are provided. Sets of filters may be selected and applied to video information at least partially based on the type of inter layer prediction implemented in coding the video information. Different filters, or filter sets, may be used for inter layer intra prediction, difference domain intra prediction, and/or difference domain inter prediction. Filter selection information may be embedded in the video bit stream. | 02-13-2014 |
20140044162 | ADAPTIVE INFERENCE MODE INFORMATION DERIVATION IN SCALABLE VIDEO CODING - Systems and methods for determining information about an enhancement layer of digital video based on information included in a base layer of digital video are described. In one innovative aspect, an apparatus for coding digital video is provided. The apparatus includes a memory for storing a base layer of digital video information and an enhancement layer of digital video information. The apparatus determines a syntax element value for a portion of the enhancement layer based on a syntax element value for a corresponding portion of the base layer. Decoding devices and methods as well as corresponding encoding devices and methods are described. | 02-13-2014 |
20140044178 | WEIGHTED DIFFERENCE PREDICTION UNDER THE FRAMEWORK OF GENERALIZED RESIDUAL PREDICTION - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores video information associated with a reference layer. The processor determines a value of a current video unit based on, at least in part, a reconstruction value associated with the reference layer and an adjusted difference prediction value. The adjusted difference prediction value is equal to a difference between a prediction of a current layer and a prediction of the reference layer multiplied by a weighting factor that is different from 1. | 02-13-2014 |
20140044179 | MULTI-HYPOTHESIS MOTION COMPENSATION FOR SCALABLE VIDEO CODING AND 3D VIDEO CODING - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores video information of a reference layer and an enhancement layer. The processor determines a value of a current video unit of the enhancement layer based on, at least in part, explicit hypotheses and implicit hypotheses calculated from movement information from the reference layer. | 02-13-2014 |
20140044180 | DEVICE AND METHOD FOR CODING VIDEO INFORMATION USING BASE LAYER MOTION VECTOR CANDIDATE - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores enhancement layer and base layer video information and a completed merge candidate list. The processor is in communication with the memory and is configured to create the completed merge candidate list associated with the enhancement layer video information. The processor is further configured to add base layer motion vector information as a candidate into the completed candidate list after the completed merge candidate list has been created to create a final candidate list. | 02-13-2014 |
20140050261 | ENHANCEMENT LAYER SCAN ORDER DERIVATION FOR SCALABLE VIDEO CODING - An apparatus for coding video information includes a memory unit configured to store video information associated with a reference block; and a processor in communication with the memory unit, wherein the processor is configured to determine a value of a current video unit associated with the reference block based on, at least in part, a classification of the reference block and a scan order selected by the processor based upon the classification. The scan order indicates an order in which values within the reference block are processed to at least partially determine the value of the current video unit. | 02-20-2014 |
20140056361 | ALTERNATIVE TRANSFORM IN SCALABLE VIDEO CODING - An apparatus for coding video data according to certain aspects includes a memory and a processor in communication with the memory. The memory stores video block information. The video block information includes reference layer block information. The processor determines, based on a parameter of the video block information, a transform function that may be used to code the video block information. The processor may encode or decode the video block information. The transform function may be an alternative transform when the parameter is a predetermined value and a primary transform when the parameter is not the predetermined value. The alternative transform includes one of: a discrete-sine-transform (DST), a Type-I DST, a Type-III DST, a Type-IV DST, a Type-VII DST, a discrete-cosine-transform (DCT), a DCT of different types, and a Karhunen-Loeve transform (KLT). | 02-27-2014 |
20140064359 | INTRA PREDICTION MOST PROBABLE MODE ORDER IMPROVEMENT FOR SCALABLE VIDEO CODING - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores video information associated with a reference layer and a corresponding enhancement layer. The processor receives a mode list associated with the enhancement layer, the mode list comprising three entities, each entity identifying a different mode for determining a value of a video unit located at a position within the enhancement layer. The processor changes the mode list when a mode associated with a co-located video unit in the reference layer is not stored as the first entity in the mode list. The co-located video unit is located at a position in the reference layer corresponding to the position of the video unit in the enhancement layer. | 03-06-2014 |
20140064360 | INTRA PREDICTION IMPROVEMENTS FOR SCALABLE VIDEO CODING - An apparatus for coding video information according to certain aspects includes a memory unit and a processor in communication with the memory unit. The memory unit stores video information associated with a reference layer and a corresponding enhancement layer. The processor determines a value of a video unit positioned at a position within the enhancement layer based at least in part on an intra prediction value weighted by a first weighting factor, wherein the intra prediction value is determined based on at least one additional video unit in the enhancement layer, and a value of a co-located video unit in the reference layer weighted by a second weighting factor, wherein the co-located video unit is located at a position in the reference layer corresponding to the position of the video unit in the enhancement layer. In some embodiments, the at least one of the first and second weighting factors is between 0 and 1. | 03-06-2014 |
20140064386 | SIGNALING OF DOWN-SAMPLING LOCATION INFORMATION IN SCALABLE VIDEO CODING - Methods and systems for video image coding are provided. Sets of filters may be selected and applied to video information at least partially based on phase displacement information between a first and second layer of video information. For example, the phase displacement information may correspond to a difference between a position of a pixel in the first layer and a corresponding position of the pixel in the second layer. The selected filter set can be an up-sampling filter or a down-sampling filter. The phase displacement information may be encoded as a syntax element embedded in the video bit stream. | 03-06-2014 |
20140072041 | WEIGHTED PREDICTION MODE FOR SCALABLE VIDEO CODING - An apparatus for coding video data according to certain aspects includes a memory and a processor in communication with the memory. The memory is configured to store video information, such as base layer video information and enhancement layer video information. The processor is configured to determine a value of a current video unit of enhancement layer video information based at least on a weighted inter-layer predictor and a weighted intra-layer predictor of at least one color component of the current video unit. | 03-13-2014 |
20140098880 | PREDICTION MODE INFORMATION UPSAMPLING FOR SCALABLE VIDEO CODING - In one embodiment, an apparatus configured to code video data includes a processor and a memory unit. The memory unit stores video data associated with a first layer having a first spatial resolution and a second layer having a second spatial resolution. The video data associated with the first layer includes at least a first layer block and first layer prediction mode information associated with the first layer block, and the first layer block includes a plurality of sub-blocks where each sub-block is associated with respective prediction mode data of the first layer prediction mode information. The processor derives the predication mode data associated with one of the plurality of sub-blocks based at least on a selection rule, upsamples the derived prediction mode data and the first layer block, and associates the upsampled prediction mode data with each upsampled sub-block of the upsampled first layer block. | 04-10-2014 |
20140105299 | PERFORMING RESIDUAL PREDICTION IN VIDEO CODING - In general, techniques are described for performing residual prediction in video coding. As one example, a device configured to code scalable or multi-view video data may comprise one or more processors configured to perform the techniques. The processors may determine a difference picture, for a current picture, based on a first reference picture in a same layer or view as the current picture and a decoded picture in a different layer or view as the current picture. The decoded picture may be in a same access unit as the first reference picture. The processors may perform bi-prediction based on the difference picture to code at least a portion of the current picture. | 04-17-2014 |
20140140405 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a base layer and an enhancement layer. The video information comprises at least one enhancement layer (EL) block and at least one co-located base layer (BL) block. The co-located BL block has motion information associated therewith. The processor is configured to, in response to determining that the size of the EL block is smaller than a threshold size, either (1) use less than all of the motion information associated with the co-located BL block to code the EL block, or (2) refrain from using any motion information associated with the co-located BL block to code the EL block. The processor may encode or decode the video information. | 05-22-2014 |
20140161179 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION BASED ON HIGH EFFICIENCY VIDEO CODING - An apparatus configured to code video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with an enhancement layer having a first block and a base layer having a second block, the second block in the base layer corresponding to the first block in the enhancement layer. The processor is configured to predict, by inter layer prediction, the first block in the enhancement layer based on information derived from the second block in the base layer. At least a portion of the second block is located outside of a reference region of the base layer, the reference region being available for use for the inter layer prediction of the first block. The processor may encode or decode the video information. | 06-12-2014 |
20140177704 | MULTI-TYPE PARALLELIZED SAMPLE ADAPTIVE OFFSET IN VIDEO CODING - In general, techniques are described for performing multiple passes of sample adaptive offset (SAO) filtering when coding video data. A video decoding device comprising one or more processors may perform the techniques. The processors may determine a first SAO pixel classification for a block of video data and determine a first offset value based on the first SAO pixel classification and one or more pixel values of the block. The one or more processors may also determine a second SAO pixel classification for the block and determine a second offset value based on the second SAO pixel classification and the one or more pixel values of block of video data. The processors may then apply the first offset value and the second offset value to the block of video data to generate a block of SAO filtered video data. | 06-26-2014 |
20140185665 | HIGH-FREQUENCY-PASS SAMPLE ADAPTIVE OFFSET IN VIDEO CODING - This disclosure presents techniques for sample adaptive offset (SAO) filtering that focus on filtering the changed region of a picture or layer (e.g., the high frequency component of video blocks of a picture or layer). In general, the techniques of this disclosure may be referred to as High-Frequency-Pass SAO (HSAO) filtering. In one example, a method for coding video data comprises obtaining a decoded block of video data, separating the decoded block of video data into a low-frequency component and a high-frequency component, applying an SAO filter to the high-frequency component to generate a SAO filtered high-frequency component, and combining the SAO filtered high-frequency component and the low-frequency component to generate a filtered decoded block of video data. | 07-03-2014 |
20140185680 | DEVICE AND METHOD FOR SCALABLE AND MULTIVIEW/3D CODING OF VIDEO INFORMATION - An apparatus configured to code (e.g., encode or decode) video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a base layer and an enhancement layer. The processor is configured to up-sample a base layer reference block by using an up-sampling filter when the base and enhancement layers have different resolutions; perform motion compensation interpolation by filtering the up-sampled base layer reference block; determine base layer residual information based on the filtered up-sampled base layer reference block; determine weighted base layer residual information by applying a weighting factor to the base layer residual information; and determine an enhancement layer block based on the weighted base layer residual information. The processor may encode or decode the video information. | 07-03-2014 |
20140192868 | INTER-LAYER REFERENCE PICTURE GENERATION FOR HLS-ONLY SCALABLE VIDEO CODING - An apparatus for coding video information may include a memory unit configured to store video information associated with a picture and a processor in communication with the memory unit configured to resample video information of a reference picture to obtain a resampled picture having a plurality of slices and a different picture size than a picture to be encoded. Further, the processor may determine slice definitions for slices in the resampled picture. The slices of the resampled picture may correspond to slices of the reference picture. The processor may determine, based on the slice definitions, whether a slice of the resampled picture satisfies one or more slice definition rules. In response to determining that the slice of the resampled picture does not satisfy at least one slice definition rule, the processor can modify the slice definition for the slice so as to satisfy the slice definition rule. | 07-10-2014 |
20140198846 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code (e.g., encode or decode) video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a base layer and an enhancement layer, the enhancement layer comprising an enhancement layer (EL) block and the base layer comprising a base layer (BL) block that is co-located with the enhancement layer block. The processor is configured to determine predicted pixel information of the EL block by applying a prediction function to pixel information of the BL block, and to determine the EL block using the predicted pixel information. The processor may encode or decode the video information. | 07-17-2014 |
20140241437 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a reference layer (RL) and an enhancement layer, the RL comprising an RL picture having an output region that includes a portion of the RL picture. The processor is configured to determine whether a condition indicates that information outside of the output region is available to predict a current block in the enhancement layer. The processor may encode or decode the video information. | 08-28-2014 |
20140247879 | Spatial Motion Vector Scaling for Scalable Video Coding - In one implementation, an apparatus is provided for encoding or decoding video information. The apparatus comprises a memory unit configured to store video information associated with a base layer and/or an enhancement layer. The apparatus further comprises a processor operationally coupled to the memory unit. In one embodiment, the processor is configured to determine a scaling factor based on spatial dimension values associated with the base and enhancement layers such that the scaling factor is constrained within a predetermined range. The processor is also configured to spatially scale an element associated with the base layer or enhancement layer using the scaling factor and a temporal motion vector scaling process. | 09-04-2014 |
20140254666 | PARALLEL PROCESSING FOR VIDEO CODING - In one example, a device for coding video data includes a video coder configured to code data representative of whether a tile of an enhancement layer picture can be predicted using inter-layer prediction, and predict data of the tile using inter-layer prediction only when the data indicates that the tile can be predicted using inter-layer prediction. | 09-11-2014 |
20140254667 | PARALLEL PROCESSING FOR VIDEO CODING - In one example, a device for coding video data includes a video coder configured to code data indicating whether tile boundaries of different layers of video data are aligned and whether inter-layer prediction is allowed along or across tile boundaries of enhancement layer blocks, code an enhancement layer block in an enhancement layer tile of the video data without using inter-layer prediction from a collocated base layer block for which inter-layer filtering or reference layer filtering across tile boundaries in a reference layer picture in an access unit including both the enhancement layer tile and the base layer block is enabled, and code the collocated base layer block. | 09-11-2014 |
20140254668 | PARALLEL PROCESSING FOR VIDEO CODING - In one example, a device for coding video data includes a video coder configured to code a value for a syntax element representative of whether any two reference layer samples, collocated with two respective enhancement layer picture samples within a common enhancement layer tile, must be within a common reference layer tile, and code the enhancement layer picture samples based at least in part on the value of the syntax element. | 09-11-2014 |
20140254669 | PARALLEL PROCESSING FOR VIDEO CODING - In one example, a device for coding video data includes a video coder configured to code, for a tile of an enhancement layer picture, data indicating a number of tiles in a base layer picture that need to be coded before the tile of the enhancement layer picture can be coded, code tiles of the base layer picture corresponding to the number of tiles, and, after coding the tiles of the base layer picture, code the tile of the enhancement layer picture substantially in parallel with at least one other tile in the base layer picture. | 09-11-2014 |
20140269939 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code video information comprises a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a reference layer (RL) and an enhancement layer (EL). The EL comprises an EL video unit and the RL comprises an RL video unit corresponding to the EL video unit. The processor is configured to perform upsampling and bit-depth conversion on pixel information of the RL video unit in a single combined process to determine predicted pixel information of the EL video unit, and determine the EL video unit using the predicted pixel information. | 09-18-2014 |
20140294062 | INTER-LAYER REFERENCE PICTURE RESTRICTION FOR HIGH LEVEL SYNTAX-ONLY SCALABLE VIDEO CODING - In one implementation, an apparatus is provided for encoding or decoding video information. The apparatus comprises a memory unit configured to store reference layer pictures associated with a reference layer, an enhancement layer, or both. The apparatus further comprises a processor operationally coupled to the memory unit. In one embodiment, the processor is configured to restrict usage of at most one reference layer pictures that has been resampled as an inter-layer reference picture, and predict a current picture using inter-layer prediction and the inter-layer reference picture. | 10-02-2014 |
20140294063 | INTER-LAYER REFERENCE PICTURE RESTRICTION FOR HIGH LEVEL SYNTAX-ONLY SCALABLE VIDEO CODING - In one implementation, an apparatus is provided for encoding or decoding video information. The apparatus comprises a memory unit configured to store reference layer pictures associated with a reference layer, an enhancement layer, or both. The apparatus further comprises a processor operationally coupled to the memory unit. In one embodiment, the processor is configured to restrict usage of at most one reference layer pictures that has a different spatial resolution than a current picture as an inter-layer reference picture, and predict the current picture using inter-layer prediction and the inter-layer reference picture. | 10-02-2014 |
20140301436 | CROSS-LAYER ALIGNMENT IN MULTI-LAYER VIDEO CODING - An apparatus for coding video information according to certain aspects includes a memory unit and a video processor in communication with the memory unit. The video processor is configured to identify a first picture included in the first set of pictures, wherein pictures within the first set of pictures having an output position after the output position of the first picture also have a decoding position after the decoding position of the first picture. The video processor is further configured to identify a second picture included in the second set of pictures, wherein pictures within the second set of pictures having an output position after the output position of the second pictures also have a decoding position after the decoding position of the second picture. The video processor is also configured to code the identified first picture and the identified second picture via one syntax element into one access unit. | 10-09-2014 |
20140301456 | INTER-LAYER PICTURE SIGNALING AND RELATED PROCESSES - In one implementation, an apparatus is provided for encoding or decoding video information. The apparatus comprises a memory configured to store inter-layer reference pictures associated with a current picture that is being coded. The apparatus further comprises a processor operationally coupled to the memory. In one embodiment, the processor is configured to indicate a number of inter-layer reference pictures to use to predict the current picture using inter-layer prediction. The processor is also configured to indicate which of the inter-layer reference pictures to use to predict the current picture using inter-layer prediction. The processor is also configured to determine an inter-layer reference picture set associated with the current picture using the indication of the number of inter-layer reference pictures and the indication of which of the inter-layer reference pictures to use to predict the current picture using inter-layer prediction. | 10-09-2014 |
20140301457 | MULTIPLE BASE LAYER REFERENCE PICTURES FOR SHVC - A method of coding video data can include receiving video information associated with a reference layer, an enhancement layer, or both, and generating a plurality of inter-layer reference pictures using a plurality of inter-layer filters and one or more reference layer pictures. The generated plurality of inter-layer reference pictures may be inserted into a reference picture list. A current picture in the enhancement layer may be coded using the reference picture list. The inter-layer filters may comprise default inter-layer filters or alternative inter-layer filters signaled in a sequence parameter set, video parameter set, or slice header. | 10-09-2014 |
20140301458 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code (e.g., encode or decode) video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a video layer comprising one or more temporal sub-layers. The processor is configured to determine presence information for a coded video sequence in a bitstream, the presence information indicating whether said one or more temporal sub-layers of the video layer are present in the bitstream. The processor may encode or decode the video information. | 10-09-2014 |
20140301466 | GENERALIZED RESIDUAL PREDICTION IN HIGH-LEVEL SYNTAX ONLY SHVC AND SIGNALING AND MANAGEMENT THEREOF - An apparatus for decoding video information according to certain aspects includes a memory unit and a processor operationally coupled to the memory unit. The memory unit is configured to store at least one reference picture list of an enhancement layer, the at least one reference picture list comprising residual prediction reference picture information. The processor is configured to: decode signaled information about residual prediction reference picture generation; generate a residual prediction reference picture based on an enhancement layer reference picture and the decoded signaled information such that the generated residual prediction reference picture has the same motion field and the same picture order count (POC) as the enhancement layer reference picture from which it is generated; and store the generated residual prediction reference picture in the at least one reference picture list of the enhancement layer. | 10-09-2014 |
20140314140 | INDICATION OF CROSS-LAYER PICTURE TYPE ALIGNMENT IN MULTI-LAYER VIDEO CODING - In one example, the disclosure is directed to techniques that include receiving a bitstream comprising at least a syntax element, a first network abstraction layer unit type, and a coded access unit comprising a plurality of pictures. The techniques further include determining a value of the syntax element which indicates whether the access unit was coded using cross-layer alignment. The techniques further include determining the first network abstraction layer unit type for a picture in the access unit and determining whether the first network abstraction layer unit type equals a value in a range of type values. The techniques further include setting a network abstraction layer unit type for all other pictures in the coded access unit to equal the value of the first network abstraction layer unit type if the first network abstraction layer unit type is equal to a value in the range of type values. | 10-23-2014 |
20140328398 | CONDITIONALLY INVOKING A RESAMPLING PROCESS IN SHVC - An apparatus for coding video information according to certain aspects includes a memory and a processor. The memory unit is configured to store video information associated with an interlayer reference picture for a current picture to be coded. The processor is configured to: receive information relating to a plurality of interlayer reference offsets that are configured to define a region of a resampled version of the interlayer reference picture, wherein the region is used to generate a prediction of the current picture, and wherein the plurality of interlayer reference offsets include a left offset, a top offset, a right offset, and a bottom offset that are each specified relative to the current picture; determine based at least in part on the plurality of interlayer reference offsets whether to resample the interlayer reference picture; and in response to determining to resample the interlayer reference picture, resample the interlayer reference picture. | 11-06-2014 |
20140355676 | RESAMPLING USING SCALING FACTOR - An apparatus for coding video information according to certain aspects includes a memory and a processor. The memory unit is configured to store video information associated with a reference layer picture and an enhancement layer picture. The processor is configured to: store video information associated with a reference layer picture and an enhancement layer picture; receive a scale factor that indicates a proportion of scaling between the reference layer picture and the enhancement layer picture in a first direction; determine, without performing a division operation, a rounding offset value using the scale factor; and determine a coordinate in the first direction of a first sample located in the reference layer picture that corresponds to a second sample located in the enhancement layer picture using the scale factor and the rounding offset value. | 12-04-2014 |
20140362909 | DYNAMIC RANGE CONTROL OF INTERMEDIATE DATA IN RESAMPLING PROCESS - An apparatus for coding video information according to certain aspects includes a memory and a processor. The memory unit is configured to store video information. The processor is configured to: obtain reference layer video information; upsample the reference layer video information in a first dimension to generate an intermediate output; constrain the intermediate output to a predetermined bit depth; and upsample the constrained intermediate output in a second dimension, wherein the second dimension is orthogonal to the first dimension. | 12-11-2014 |
20140369426 | INTER-COMPONENT FILTERING - In one embodiment, an apparatus configured to encode video information includes a memory unit and a processor. The memory unit is configured to store an inter-layer reference picture comprising video information. The processor is operationally coupled to the memory unit. In addition, the processor is configured to partition the inter-layer reference picture into a quadtree structure having a plurality of leafs; determine inter-component filter parameters specific to each individual leaf based upon the video information in each individual leaf and signal the inter-component filter parameters for each of the leafs. | 12-18-2014 |
20150016502 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a current layer and an enhancement layer, the current layer having a current picture. The processor is configured to determine whether the current layer may be coded using information from the enhancement layer, determine whether the enhancement layer has an enhancement layer picture corresponding to the current picture, and in response to determining that the current layer may be coded using information from the enhancement layer and that the enhancement layer has an enhancement layer picture corresponding to the current picture, code the current picture based on the enhancement layer picture. The processor may encode or decode the video information. | 01-15-2015 |
20150016512 | INTER-COLOR COMPONENT RESIDUAL PREDICTION - A device for decoding video data includes a memory configured to store video data, and at least one processor. The at least one processor may be configured to: determine luma residual samples for a block of video data, determine predictive chroma residual samples for the block of video data, scale the luma residual samples with a scale factor to produce scaled luma residual samples, and determine updated chroma residual samples based on the predictive chroma residual samples and the scaled luma residual samples. | 01-15-2015 |
20150016543 | BITSTREAM RESTRICTIONS ON PICTURE PARTITIONS ACROSS LAYERS - Bitstream restrictions or constraints on the partitioning of pictures across layers of video data are described. In some examples, the number of tiles per picture for each layer of a plurality of layers is constrained based on a maximum number of tiles per picture for the layer. In some examples, the number of tiles per picture for each layer of the plurality of layers is no greater than the maximum number of tiles per picture for the layer. In some examples, a sum of the numbers of tiles per picture for the plurality of layers is no greater than a sum of the maximum numbers of tiles per picture for the plurality of layers. In some examples, a second largest coding unit (LCU) or coding tree block (CTB) size for a second layer is constrained based on, e.g., to be equal to, a first LCU size for a first layer. | 01-15-2015 |
20150023419 | DEVICE AND METHOD FOR SCALABLE CODING OF VIDEO INFORMATION - An apparatus configured to code video information includes a memory and a processor in communication with the memory. The memory is configured to store video information associated with a reference layer and an enhancement layer, the reference layer comprising a reference layer (RL) picture having a first slice and a second slice, and the enhancement layer comprising an enhancement layer (EL) picture corresponding to the RL picture. The processor is configured to generate an inter-layer reference picture (ILRP) by upsampling the RL picture, the ILRP having a single slice associated therewith, set slice information of the single slice of the ILRP equal to slice information of the first slice, and use the ILRP to code at least a portion of the EL picture. The processor may encode or decode the video information. | 01-22-2015 |
20150055703 | DETERMINING REGIONS WHEN PERFORMING INTRA BLOCK COPYING - In general, techniques are described for performing an intra block copying process to code video data. A video decoding device that includes a memory and one or more processors may perform the techniques. The memory may be configured to store a current block of a picture. The processors may be configured to perform an intra block copying process to decode the current block using a prediction block that is from a same slice or a same tile as that in which the coded current block resides, the prediction block restricted to be within a search region that only includes the same slice or the same tile as that in which the coded current block resides. | 02-26-2015 |
20150063440 | CONSTRAINED INTRA PREDICTION IN VIDEO CODING - A method of encoding video data includes determining that a current block of video data is to be encoded using an intra block copy (BC) mode and constrained intra prediction, determining one or more reference blocks that may be used for encoding the current block using the intra BC mode, wherein each of the one or more reference blocks is encoded with an intra prediction mode, and encoding the current block of video data using the intra BC mode and at least one of the determined one or more reference blocks. | 03-05-2015 |