Codeword assignment for intra chroma mode signaling for hevc

Inactive Publication Date: 2012-07-19
SONY CORP
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[0006]Intra prediction is used in state-of-the-art video coding standards such as AVC. The intra prediction modes are coded into the bitstream. Luma and chroma components could potentially have different prediction modes. For chroma components, there are 5 different modes defined in AVC: vertical, horizontal, DC, diagonal down right, and “same as luma.” Statistics show tha

Problems solved by technology

However, the “same as luma” mode is assigned the longes

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  • Codeword assignment for intra chroma mode signaling for hevc
  • Codeword assignment for intra chroma mode signaling for hevc
  • Codeword assignment for intra chroma mode signaling for hevc

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[0014]Since the texture pattern of luma and chroma components are correlated, often times the mode used for the luma prediction is also good for the chroma prediction. Thus, the “same as luma” mode is likely to be the best mode. Therefore, a redefined binarization / Variable Length Coding (VLC) scheme is shown in Table 2. As shown, the “same as luma” mode has the shortest codeword (only 1 bit) in the improved scheme.

TABLE 2Standard Binarization / VLC codeword versusImproved Binarization / VLC codeword.StandardImprovedBinarization / Binarization / intra_pred_mode_chromaVLC CodewordVLC Codeword0 (vertical)0101 (horizontal)101102 (DC)11011103 (diagonal down right)111011114 (same as luma)11110

[0015]Furthermore, chroma intra modes are not mutually exclusive. For example, if the luma intra mode is vertical, then the “same as luma” is the same as vertical. Therefore, codeword space reduction is able to be used to further improve coding efficiency, such that if the luma mode is one of vertical, horiz...

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Abstract

Intra prediction is used in state-of-the-art video coding standards such as AVC. The intra prediction modes are coded into the bitstream. Luma and chroma components could potentially have different prediction modes. For chroma components, there are 5 different modes defined in AVC: vertical, horizontal, DC, diagonal down right, and “same as luma”. Statistics show that the “same as luma” mode is frequent used, but in AVC, this mode is encoded using more bits than other modes during entropy coding, therefore the coding efficiency is decreased. Accordingly, a modified binarization/codeword assignment for chroma intra mode signaling is able to be utilized for high efficiency video coding (HEVC), the next generation video coding standard.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]This application claims priority under 35 U.S.C. §119(e) of the U.S. Provisional Patent Application Ser. No. 61 / 432,970, filed Jan. 14, 2011 and titled, “CODEWORD ASSIGNMENT FOR INTRA CHROMA MODE SIGNALING FOR HEVC.” The Provisional Patent Application Ser. No. 61 / 432,970, filed Jan. 14, 2011 and titled, “CODEWORD ASSIGNMENT FOR INTRA CHROMA MODE SIGNALING FOR HEVC” is also hereby incorporated by reference in its entirety for all purposes.[0002]This application also claims priority under 35 U.S.C. §119(e) of the U.S. Provisional Patent Application Ser. No. 61 / 432,957, filed Jan. 14, 2011 and titled, “CODEWORD SPACE REDUCTION FOR INTRA CHROMA MODE SIGNALING FOR HEVC.” The Provisional Patent Application Ser. No. 61 / 432,957, filed Jan. 14, 2011 and titled, “CODEWORD SPACE REDUCTION FOR INTRA CHROMA MODE SIGNALING FOR HEVC” is also hereby incorporated by reference in its entirety for all purposes.FIELD OF THE INVENTION[0003]The present inven...

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Application Information

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IPC IPC(8): H04N7/26H04N19/593
CPCH04N19/00569H04N19/50H04N19/176H04N19/46H04N19/61H04N19/93H04N19/11H04N19/463H04N19/186H04N19/23H04N19/593H04N19/124H04N19/188
Inventor LIU, WEIDONG, LINA
Owner SONY CORP
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