Quantization of the escape pixels of a video block in palette coding mode
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A color palette, pixel technology, applied in the field of video encoding and decoding, to maintain data accuracy, save computing resources and bandwidth requirements, improve efficiency and accuracy
Active Publication Date: 2016-11-02
QUALCOMM INC
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[0009] Spatial or temporal prediction leads to a predictive block of the block to be decoded
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[0032] This disclosure includes techniques for video coding and compression. Specifically, this disclosure describes techniques for palette-based coding of video data. In traditional video coding, images are assumed to be continuous-tone and spatially smooth. Based on these assumptions, various tools have been developed, such as block-based transforms, filtering, etc., and such tools have demonstrated good performance for natural content video.
[0033] However, in applications such as remote desktops, collaborative work, and wireless displays, computer-generated screen content (such as text or computer graphics, for example) may be the primary content to be compressed. This type of content tends to have discrete tones and is characterized by sharp lines and high-contrast object boundaries. The assumptions of continuous tone and smoothness may no longer apply to screen content, and thus, traditional video coding techniques may not be an efficient way to compress video data i...
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Abstract
In palette-based coding, a video coder may form a so-called "palette" as a table of colors representing the video data of a given block. The video coder may code index values for one or more pixels values of a current block of video data, where the index values indicate entries in the palette that represent the pixel values of the current block. A method includes determining a palette for a block of video data, identifying escape pixel(s) not associated with any palette entries, identifying a single quantization parameter (QP) value for all escape pixels of the block for a given color channel using a QP value for non-palette based coding of transform coefficients, dequantizing each escape pixel using the identified QP value, and determining pixel values of the block using the dequantized escape pixels and index values for any pixel(s) associated with any palette entries.
Description
[0001] This application claims the benefit of: [0002] U.S. Provisional Patent Application No. 61 / 923,163, filed January 2, 2014; [0003] U.S. Provisional Patent Application No. 61 / 924,141, filed January 6, 2014; and [0004] U.S. Provisional Application No. 61 / 969,759, filed March 24, 2014, [0005] The entire contents of each of these are incorporated herein by reference. technical field [0006] The present invention relates to video encoding and decoding. Background technique [0007] Digital video capabilities can be incorporated into a wide variety of devices, including digital television, digital broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, tablet computers, electronic book readers, Digital cameras, digital recording devices, digital media players, video game devices, video game consoles, cellular or satellite radiotelephones (so-called "smart phones"), video teleconferencing devices, video stream...
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