A system implements multiple coding formats for coding pixels within a picture. The formats may be selected based on one or more of the input picture and encoding variables. The coding formats may have varying chroma sampling densities. Filtering may be applied to convert among the various formats or to convert a sampled input to a specific chroma sampling density. The format associated with various groups within a coded bitstream may be changed to adapt to evolution of the one or more variables or inputs.

High-Throughput Image and Video Compression

An apparatus comprising a processor configured to receive a video frame comprising a current block, wherein the current block comprises a plurality of original pixels, compute a plurality of reconstructed pixels based on the original pixels, and use an intra prediction mode to generate a set of prediction pixels based on a set of reconstructed pixels in the plurality of reconstructed pixels.

Pixel-Based Intra Prediction for Coding in HEVC

A coder (e.g., an encoder or decoder) implements coding of two dimensional blocks of image data using two dimensional differential pulse code modulation (2D DPCM). The coder may switch between DPCM and other types of coding, such as transform coding on a block by block basis. The 2D DPCM may obtain a reconstructed pixel within the two dimensional bloc and code a second, different, pixel within the two dimensional block using the reconstructed pixel. The coder may also create a bitstream of entropy encoded residuals that supports hybrid implicit / explicit specification of coding parameters.

2D Block Image Encoding

A system adjusts the quantization parameter used to encode an image sample (e.g., pixel component). The system accesses a quantization parameter for encoding a current image pixel from an implicit rate control and obtains a measure of another image sample within a particular distance from the sample. When the measure meets a predetermined criterion, the system adjusts the quantization parameter, encodes the pixel after adjusting the quantization parameter, and explicitly indicates the adjusting of the quantization parameter to a decoding system.

Bounded Rate Near-Lossless And Lossless Image Compression

An encoder may implement an indexed color history that stores color values for previously encoded pixels. The encoder may obtain a current pixel or current group of pixels for encoding and determine whether to encode the current pixel using the indexed color history. In doing so, the encoder may compare a color value of the current pixel with color values of the previously coded pixels to determine whether the current pixel is sufficiently similar to a previously coded pixel color value, e.g., by satisfying one or more similarity criteria. When the similarity criteria are satisfied, the encoder may encode the current pixel as an index value referencing the entry in the indexed color history storing a color value that satisfies the similarity criteria. When the similarity criteria are not satisfied, the encoder may encode the current pixel using another encoding method or technique.

Indexed Color History In Image Coding

A method and system are provided in which a device can determine, for a current block of pixels, a first intra-prediction based on reconstructed neighboring pixels and a second intra-prediction based on a pattern match with a reconstructed block of pixels. One of the two intra-predictions may be selected to generate a compressed bit stream comprising information of the current block of pixels. The intra-prediction selection may be performed on a block-by-block basis. An indication may be generated as to which of the two intra-predictions was selected for a particular block of pixels. When pattern matching is selected, a positional relationship of the reconstructed block of pixels with the matching pattern may be encoded and embedded into the compressed bit stream. The same device or another device may be operable to receive a compressed bit stream comprising intra-prediction selection and/or positional relationship information to reconstruct a current block of pixels.

Method and System for Video and Image Coding Using Pattern Matching for Intra-Prediction

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Method and System for Video and Image Coding Using Pattern Matching for Intra-Prediction