Patent application number | Description | Published |
20110222786 | CLASSIFYING AN IMAGE'S COMPRESSION LEVEL - A method of classifying a compressed input image's compression level, comprising applying inverse quantization to DCT coefficients extracted from the compressed input image, giving rise to dequantized DCT coefficients, applying a threshold to the dequantized DCT coefficients, and determining a compression level classification for the compressed input image according to a relation among the threshold and at least one of the dequantized DCT coefficients. | 09-15-2011 |
20120201475 | METHOD AND SYSTEM FOR PROCESSING AN IMAGE - There is provided according to an aspect the present invention a method and a system for processing a discrete input image to a reduced-size discrete output image. According to some embodiments, the system may include an interface, a quality parameter controller and an intra-prediction encoder. The quality controller is adapted to provide an encoding-quality parameter enabling a substantial size reduction of the discrete output image, wherein the parameter is related to a target quantitative-similarity measure between the output image and the input image. The intra-prediction encoder is adapted to re-encode the input image, wherein re-encoding includes intra-image prediction, and wherein the encoder is configured in accordance with the encoding-quality parameter. | 08-09-2012 |
20120201476 | APPARATUS AND METHODS FOR RECOMPRESSION OF DIGITAL IMAGES - A system and method for generating a second reduced size digital image from a first digital image, the method including iteratively compressing the first digital image to an extent determined by a quality measure comprising at least a blockiness measure quantifying added artifactual edges along coding block boundaries of the second image and/or use of a quantization matrix generated by computing a weighted average of the quantization matrix of the first digital image and a scaled second quantization matrix. | 08-09-2012 |
20130064466 | APPARATUS AND METHODS FOR RE-COMPRESSION HAVING A MONOTONIC RELATIONSHIP BETWEEN EXTENT OF COMPRESSION AND QUALITY OF COMPRESSED IMAGE - A computerized method for independent disjoint block-level recompression of a first image generated by independent coding of disjoint blocks in a precursor image, the first image having at least one first quantization matrix associated there-with, the method comprising performing at least one independent disjoint block-level compression operation, using a processor on the first image, thereby to generate a re-compressed second image including generating a new quantization matrix and using the new quantization matrix for the independent disjoint block-level compression, including computing a rounding error created by the quantization process utilizing the new quantization matrix and, if needed, adjusting at least one value of the new quantization matrix to reduce a rounding error created by the quantization process utilizing the new quantization matrix. | 03-14-2013 |
20130152767 | GENERATING PITCHED MUSICAL EVENTS CORRESPONDING TO MUSICAL CONTENT - A method of suggesting pitched musical events corresponding to provided digital musical content, comprising obtaining a frequency domain representation of the digital musical content, applying a pitch salience estimation over the frequency domain representation to provide a pitch salience time-frequency map; and grouping local frequency peaks along a time axis of the pitch salience time-frequency map which are substantially continuous in terms frequency and/or salience giving rise to a partial. | 06-20-2013 |
20130170764 | DOWNSIZING AN ENCODED IMAGE - There is provided a system, a computer program product, program storage device readable by machine, and a method of downsizing an input disjoint block level encoded image. According to examples of the presently disclosed subject matter, the method can include calculating a DCT downsize ratio for downsizing the input image in a DCT domain according to a target downsize ratio and according to a size of a DCT transform length associated with the input image; adapting an I-DCT according to the DCT domain downsize ratios; performing the adapted I-DCT; providing an intermediate image as output of a DCT domain process; and applying a pixel domain interpolation to the intermediate image according to dimensions of the intermediate image and according to dimensions of the target image. | 07-04-2013 |
20130182952 | METHOD OF CLASSIFYING A CHROMA DOWNSAMPLING ERROR - There is provided an apparatus and a method of evaluating an effect of chroma downsampling in a compression process of an input image. According to examples of the presently disclosed subject matter the method can include: computing an error for a target chroma downsampling (“CDS”) block based on characteristics of DCT coefficients in the U and/or V planes of a respective CDS candidates group in the input image, and further based on a diversity of the DCT coefficients in the U and/or V planes of the respective CDS candidates group in the input image; and computing an estimated perceptual effect of CDS over the input image based on a plurality of target CDS blocks error values. | 07-18-2013 |
20140177734 | CONTROLLING A VIDEO CONTENT SYSTEM - According to examples of the presently disclosed subject matter, a method of controlling a video content system can include: obtaining a current input frame and a preceding input frame from an input video sequence and obtaining a current degraded frame and a preceding degraded frame from a degraded video sequence corresponding to the input video sequence; computing a first differences value from the current input and the preceding input frames and a second differences value from the current degraded frame and the preceding degraded frame, comparing the first and second differences values, giving rise to an inter-frame quality score; computing an intra-frame quality score using an intra-frame quality measure that is applied in the pixel-domain of the current degraded frame and the current input frame and providing a configuration instruction to the video content system based on a quality criterion related to the inter-frame and the intra-frame quality scores. | 06-26-2014 |
20140211859 | CONTROLLING A VIDEO CONTENT SYSTEM - According to examples of the presently disclosed subject matter, a method of controlling a video content system can include: obtaining a current input frame and a preceding input frame from an input video sequence and obtaining a current degraded frame and a preceding degraded frame from a degraded video sequence corresponding to the input video sequence; computing a first differences value from the current input and the preceding input frames and a second differences value from the current degraded frame and the preceding degraded frame, comparing the first and second differences values, giving rise to an inter-frame quality score; computing an intra-frame quality score using an intra-frame quality measure that is applied in the pixel-domain of the current degraded frame and the current input frame and providing a configuration instruction to the video content system based on a quality criterion related to the inter-frame and the intra-frame quality scores. | 07-31-2014 |
20140355668 | Method and System for Controlling Video Frame Encoding - A method of enabling iterative encoding of a video frame by a video encoder, comprising obtaining a video-encoder-state resulting from encoding of a previous input video frame and previous to encoding of a current input video frame, copying the video-encoder-state giving rise to a reserved state and obtaining a candidate current encoded video frame from the video encoder, and in case the candidate current encoded video frame does not meet an encoding criterion, copying the reserved state back to the video encoder to enable the video encoder to re-encode the current input video frame. | 12-04-2014 |
20150063693 | CONTROLLING A COMPRESSION OF AN IMAGE ACCORDING TO A DEGREE OF PHOTO-REALISM - A method of controlling a compression of an image according to a degree of photo-realism in the image, comprising computing a value indicating a degree of photo-realism for an input image based on a distribution of pixel luminance values within the image, calculating a configuration parameter based on the photo-realism value for the image, and configuring an encoder to compress the image according to the configuration parameter. | 03-05-2015 |