Patent application number | Description | Published |
20100124285 | System and Method for Image Coding - A system and method for image coding with error feedback are provided, including a method comprising receiving image data containing at least one macro block of pixels, and computing an activity indicator for a macro block. The method further comprising computing prediction error values for pixels in the macro block, and scaling the prediction error values based on the activity indicator. | 05-20-2010 |
20110122942 | TECHNIQUES FOR PERCEPTUAL ENCODING OF VIDEO FRAMES - In a video encoder, pixel values of a macro-block are processed to determine an activity measure indicative of the type of content in the macro-block. Several techniques are employed for determining the activity measure of a macro-block. In an embodiment, a default quantization scale for quantizing a macro-block is modified based on the activity measure of the macro-block. In another embodiment, the macro-block is classified into one of multiple classes based on its activity measure. The default quantization scale for quantizing the macro-block is modified based on the classification of the macro-block. In yet another embodiment, an encoding mode to be used for encoding a macro-block is also determined on the basis of the class of the macro-block. Several of the techniques exploit the fact that the human visual system (HVS) has different sensitivities in perceiving a (rendered) macro-block or video frame, depending on the type of macro-block content. | 05-26-2011 |
20110235706 | REGION OF INTEREST (ROI) VIDEO ENCODING - A method of encoding an image frame in a video encoding system. The image frame has a region of interest (ROI) and a non region of interest (non-ROI). In the method, quantization scale for the image frame based on rate control information is determined. ROI statistics based on residual energy of the ROI and non-ROI is then calculated. Quantization scale for the image frame based on ROI priorities and ROI statistics is calculated. Further, quantization scales for ROI and non-ROI based on ROI priorities are determined. | 09-29-2011 |
20110235708 | Method and System for Detecting Global Brightness Change for Weighted Prediction in Video Encoding - A method of encoding a coding unit of a digital video sequence is provided that includes computing a brightness measure for each region in a plurality of regions in the coding unit, wherein the brightness measure indicates a relative brightness between the region in the coding unit and a corresponding region in a reference coding unit, determining a number of regions in the plurality of regions with significant brightness change by comparing each brightness measure to a region brightness change threshold, detecting whether there is global brightness change in the coding unit by comparing the number of regions to a global brightness threshold, and when global brightness change is detected, computing weighted prediction factors to be used for weighted prediction in encoding the coding unit. | 09-29-2011 |
20120008691 | METHOD AND APPARATUS FOR REGION-BASED WEIGHTED PREDICTION WITH IMPROVED GLOBAL BRIGHTNESS DETECTION - A method and apparatus for determining a region-based weighted prediction with improved global brightness detection. The method includes applying a global brightness change detection methods by computing the weighted prediction parameters, determining if the brightness change is different amount of change for the different regions, if the change is not different, calculate motion estimation and setting Refidx to 1 and setting Refidx is set to 0 when there is change, determining the best motion vector, motion vector cost and the best reference input, and determining a region-based weighted prediction with improved global brightness detection based on the motion vector data. | 01-12-2012 |
20120044323 | Method and Apparatus for 3D Image and Video Assessment - A method and apparatus for assessing 3 dimensional video. The method includes computing at least one of 3 dimensional quality and geometric quality, and combining two quality values for overall 3 dimensional quality assessment. | 02-23-2012 |
20120063516 | Motion Estimation in Enhancement Layers in Video Encoding - A method for encoding a video sequence in a scalable video encoder is provided that includes selecting a first search window configuration for coding a current picture of the video sequence in an enhancement layer encoder of the scalable video encoder based on motion vectors generated by a reference layer encoder when encoding the current picture, and coding the current picture in the enhancement layer encoder using the first search window configuration. | 03-15-2012 |
20120082392 | METHOD AND APPARATUS FOR FRAME CODING IN VERTICAL RASTER SCAN ORDER FOR HEVC - A method and apparatus for frame coding in adaptive raster scan order. The method includes encoding at least one of image or video utilizing input frames and at least one of a data related to the input frame to produce bitstream with raster scan order information and displacement information for producing compressed video bitstream, at decoding time, decoding at least one of the encoded bitstream with raster scan order information and displacement information for producing compressed video bitstream. | 04-05-2012 |
20120287987 | Coding of Scene Changes Using Picture Dropping - A method for encoding a video sequence in a video encoder to generate a compressed bit stream is provided that includes coding a picture in the video sequence, detecting a scene change in the picture, and responsive to detecting the scene change, dropping the picture, signaling repetition of another picture in the compressed bit stream, and intra-coding a subsequent picture in the video sequence. | 11-15-2012 |
20130010871 | Method, System and Computer Program Product for Selecting a Motion Vector in Scalable Video Coding - From among blocks within a region of a first image, a search is performed for a highest scoring match to a block of a second image. Searching for the highest scoring match includes penalizing scores of blocks outside a portion of the region versus scores of blocks within the portion of the region. A motion vector is coded between the block of the second image and the highest scoring match. | 01-10-2013 |
20130011047 | Method, System and Computer Program Product for Switching Between 2D and 3D Coding of a Video Sequence of Images - A video sequence of images includes at least first and second images. In response to at least first and second conditions being satisfied, an encoding mode is switched between two-dimensional video coding and three-dimensional video coding. The first condition is that the second image represents a scene change in comparison to the first image. The second image is encoded according to the switched encoding mode. | 01-10-2013 |
20130011063 | METHOD, SYSTEM AND COMPUTER PROGRAM PRODUCT FOR CODING A REGION OF INTEREST WITHIN AN IMAGE OF MULTIPLE VIEWS - For coding at least one region of interest within an image of multiple views, disparities are identified between the multiple views. In response to the disparities, the at least one region of interest is identified. The at least one region of interest is encoded at lower quantization relative to a remainder of the image. The remainder of the image is encoded at higher quantization relative to the at least one region of interest. | 01-10-2013 |
20130051454 | Sample Adaptive Offset (SAO) Parameter Signaling - A method for sample adaptive offset (SAO) filtering and SAO parameter signaling in a video encoder is provided that includes determining SAO parameters for largest coding units (LCUs) of a reconstructed picture, wherein the SAO parameters include an indicator of an SAO filter type and a plurality of SAO offsets, applying SAO filtering to the reconstructed picture according to the SAO parameters, and entropy encoding LCU specific SAO information for each LCU of the reconstructed picture in an encoded video bit stream, wherein the entropy encoded LCU specific SAO information for the LCUs is interleaved with entropy encoded data for the LCUs in the encoded video bit stream. Determining SAO parameters may include determining the LCU specific SAO information to be entropy encoded for each LCU according to an SAO prediction protocol. | 02-28-2013 |
20130083163 | Perceptual Three-Dimensional (3D) Video Coding Based on Depth Information - A method for encoding a multi-view frame in a video encoder is provided that includes computing a depth quality sensitivity measure for a multi-view coding block in the multi-view frame, computing a depth-based perceptual quantization scale for a 2D coding block of the multi-view coding block, wherein the depth-based perceptual quantization scale is based on the depth quality sensitive measure and a base quantization scale for the 2D frame including the 2D coding block, and encoding the 2D coding block using the depth-based perceptual quantization scale. | 04-04-2013 |
20130114909 | Method and Apparatus for Image and Video Coding Using Hierarchical Sample Adaptive Band Offset - A method and apparatus for image coding using hierarchical sample adaptive band offset. The method includes decoding a signal of a portion of an image, determining a band offset type and offset of a portion of the image, utilizing the band offset type and offset to determine a sub-band, and reconstructing a pixel value according to the determined offset value. | 05-09-2013 |
20130120543 | Method, System and Computer Program Product for Adjusting a Convergence Plane of a Stereoscopic Image - First and second views of a stereoscopic image are received. In response to determining that the stereoscopic image has a predominance of foreground features, a convergence plane of the stereoscopic image is adjusted to improve a depth resolution of at least one foreground feature within the stereoscopic image for display to a human by a display device. In response to determining that the stereoscopic image has a predominance of background features, the convergence plane is adjusted to position at least most of the stereoscopic image as background features for display to the human by the display device. | 05-16-2013 |
20130128952 | Method and Apparatus for SSIM-Based Bit Allocation - A method and an encoder for SSIM-based bits allocation. The encoder includes a memory and a processor utilized for allocating bits based on SSIM, wherein the processor estimates the model parameter of SSIM-based distortion model for the current picture and determines allocates bits based on the SSIM estimation. | 05-23-2013 |
20130223542 | Sample Adaptive Offset (SAO) Parameter Signaling - Techniques for signaling of sample adaptive offset (SAO) information that may reduce the coding rate for signaling such information in the compressed bit stream are provided. More specifically, techniques are provided that allow SAO information common to two or more of the color components to be signaled using one or more syntax elements (flags or indicators) representative of the common information. These techniques reduce the need to signal SAO information separately for each color component. | 08-29-2013 |
20130287099 | Block Artifact Suppression in Video Coding - A method for encoding a video sequence in a video encoder is provided that includes adapting a quantization parameter of a block of pixels in a picture of the video sequence based on a transform block size of the block of pixels to determine a final quantization parameter, and quantizing transform coefficients of the block of pixels using the final quantization parameter. | 10-31-2013 |
20130308696 | Method and Apparatus for Sample Adaptive Offset Without Sign Coding - A method and apparatus for sample adaptive offset without sign coding. The method includes selecting an edge offset type for at least a portion of an image, classifying at least one pixel of at least the portion of the image into edge shape category, calculating an offset of the pixel, determining the offset is larger or smaller than a predetermined threshold, changing a sign of the offset based on the threshold determination; and performing entropy coding accounting for the sign of the offset and the value of the offset. | 11-21-2013 |
20140185681 | Hierarchical Inter-Layer Prediction in Multi-Loop Scalable Video Coding - A method for encoding a video sequence in a scalable video encoder to generate a scalable bitstream is provided that includes encoding the video sequence in a first layer encoder of the scalable video encoder to generate a first sub-bitstream, encoding the video sequence in a second layer encoder of the scalable video encoder to generate a second sub-bitstream, wherein portions of the video sequence being encoded in the second layer encoder are predicted using reference portions of the video sequence encoded in the first layer encoder, combining the first sub-bitstream and the second sub-bitstream in the scalable bitstream, and signaling an indication of a highest temporal level of the first sub-bitstream comprising at least one of the reference portions in the scalable bitstream. | 07-03-2014 |
20140185691 | Signaling Decoded Picture Buffer Size in Multi-Loop Scalable Video Coding - A method for encoding a video sequence in a scalable video encoder to generate a scalable bitstream is provided that includes encoding the video sequence in a first layer encoder of the scalable video encoder to generate a first sub-bitstream, encoding the video sequence in a second layer encoder of the scalable video encoder to generate a second sub-bitstream, wherein portions of the video sequence being encoded in the second layer encoder are predicted using reference portions of the video sequence encoded in the first layer encoder, combining the first sub-bitstream and the second sub-bitstream to generate the scalable bitstream, and signaling in the scalable bitstream an indication of a maximum decoded picture buffer (DPB) size needed for decoding the second sub-bitstream and the first sub-bitstream when the second sub-bitstream is a target sub-bitstream for decoding. | 07-03-2014 |
20140301465 | Video Coding Using Intra Block Copy - A method for decoding encoded blocks of pixels from an encoded video bit stream is provided that includes decoding a block vector corresponding to an encoded block of pixels from the encoded bit stream, verifying that the block vector indicates a block of reconstructed pixels in a search area including reconstructed pixels of a largest coding unit (LCU) including the encoded block of pixels and N left neighboring reconstructed LCUs of the LCU, and decoding the encoded block of pixels, wherein the block of reconstructed pixels is used as a predictor for the encoded block of pixels. | 10-09-2014 |
20140334558 | SAMPLE ADAPTIVE OFFSET (SAO) PARAMETER SIGNALING - A method for sample adaptive offset (SAO) filtering and SAO parameter signaling in a video encoder is provided that includes determining SAO parameters for largest coding units (LCUs) of a reconstructed picture, wherein the SAO parameters include an indicator of an SAO filter type and a plurality of SAO offsets, applying SAO filtering to the reconstructed picture according to the SAO parameters, and entropy encoding LCU specific SAO information for each LCU of the reconstructed picture in an encoded video bit stream, wherein the entropy encoded LCU specific SAO information for the LCUs is interleaved with entropy encoded data for the LCUs in the encoded video bit stream. Determining SAO parameters may include determining the LCU specific SAO information to be entropy encoded for each LCU according to an SAO prediction protocol. | 11-13-2014 |
20140334559 | Sample Adaptive Offset (SAO) Parameter Signaling - Techniques for signaling of sample adaptive offset (SAO) information that may reduce the coding rate for signaling such information in the compressed bit stream are provided. More specifically, techniques are provided that allow SAO information common to two or more of the color components to be signaled using one or more syntax elements (flags or indicators) representative of the common information. These techniques reduce the need to signal SAO information separately for each color component. | 11-13-2014 |