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Method and apparatus for improved intra prediction mode coding

A technology of prediction mode and coding method, applied in the field of coding technology

Active Publication Date: 2013-09-18
HFI INNOVATION INC
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Problems solved by technology

Although motion-compensated inter-frame coding can effectively reduce the bit rate of compressed video, intra-mode coding is still required to process original images, or to periodically insert I-pictures or I-blocks for Random access or mitigation of error propagation

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  • Method and apparatus for improved intra prediction mode coding

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[0014] H.264 / AVC and the intra-mode coding in HEVC under development are more advanced than older coding standards such as MPEG-1 / 2 / 4. Intra mode coding in H.264 / AVC and HEVC can perform prediction in the spatial domain based on adjacent processed blocks. For the luma component in H.264 / AVC, it allows 3 three division methods, namely, intra 4×4, intra 8×8 and intra 16×16. For the chrominance component, the intra prediction size is fixed at 8×8. For each block size, multiple prediction modes are also allowed. For example, a 4×4 luma block has 9 prediction modes corresponding to vertical prediction, horizontal prediction, DC prediction and 6 off-axis predictions. Each 8×8 chroma component of a macroblock is predicted from the previously coded and reconstructed upper chroma samples and / or left chroma samples. For H.264 / AVC, there are four intra-frame chroma prediction modes: DC mode (mode 0), horizontal mode (mode 1), vertical mode (mode 2), and planar mode (mode 3). The use ...

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Abstract

A method and an apparatus for coding intra chroma prediction mode of a chroma block are provided. The method comprises: receiving a set of chroma mode symbols associated with the intra chroma prediction mode of the chroma block, wherein the set of chroma mode symbols includes one entry associated with a Luma_mode to allow the chroma block to use an intra luma prediction mode of a corresponding luma block or an selected intra luma prediction mode of several corresponding luma block as the intra chroma prediction mode; determining the variable length codes for the set of chroma mode symbols, wherein a shortest length code is assigned to the Luma_mode; receiving a current intra chroma prediction code for a current chroma block; and determining a chroma prediction mode for the current intra chroma prediction mode of the current chroma block according to the variable length codes. A method and an apparatus for decoding intra chroma prediction mode of a chroma block are also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 61 / 430,701, filed January 7, 2011, entitled "Improved Intra Prediction Mode Coding Method," and filed January 31, 2011 U.S. Provisional Application No. 61 / 437,910, entitled "Improved Intra Prediction Mode Coding Method". The entire contents of said application are hereby incorporated by reference. technical field [0003] The present invention relates to video coding, and in particular to coding techniques related to intra chroma prediction mode. Background technique [0004] Motion compensated inter-frame coding (motion compensated inter-frame coding) is widely adopted by various coding standards, such as MPEG-1 / 2 / 4 and H.261 / H.263 / H.264 / AVC. Although motion-compensated inter-frame coding can effectively reduce the bit rate of compressed video, intra-mode coding is still required to process original images, or to periodically insert I-pictures or ...

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Application Information

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IPC IPC(8): H04N7/32
CPCH04N19/11H04N19/13H04N19/182H04N19/186
Inventor 国玫郭峋雷少民
Owner HFI INNOVATION INC
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