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Encoding method and device and decoding method and device

A technology of encoding method and decoding method, applied in digital video signal modification, electrical components, image communication, etc., to achieve the effect of improving encoding efficiency

Active Publication Date: 2016-05-11
HFI INNOVATION INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 the original image, or to periodically insert I-pictures (I-pictures) or I-blocks (I-blocks) for Random access or error propagation mitigation

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  • Encoding method and device and decoding method and device
  • Encoding method and device and decoding method and device
  • Encoding method and device and decoding method and device

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Embodiment Construction

[0015] 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

The present invention provides an encoding method and device for encoding an intra-frame chroma prediction mode of a chroma block. The method includes receiving a set of chroma mode symbols associated with an intra chroma prediction mode for a chroma block, the set of chroma mode symbols including entries associated with a luma mode to allow a chroma block to use a corresponding luma block The intra-frame luma prediction mode or the selected intra-frame luma prediction mode of a plurality of corresponding luma blocks as the intra-frame chroma prediction mode; determine a plurality of variable-length codes for this group of chroma mode symbols, the shortest possible A variable length code is assigned to the luma mode; a current intra chroma prediction mode for the current chroma block is received; and a chroma for the current intra chroma prediction mode for the current chroma block is determined according to the plurality of variable length codes predictive code. The invention also provides a decoding method and device for decoding an intra-frame chroma prediction mode of a chroma block. The above method and device can improve the coding efficiency of the intra-frame chroma prediction mode.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from U.S. Provisional Application No. 61 / 430,701, filed January 7, 2011, entitled "Improved IntraPrediction Mode Coding Method," and filed January 31, 2011, with Application No. US Provisional Application No. 61 / 437,910, entitled "Improved IntraPrediction 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 intrachroma prediction mode. Background technique [0004] Motion compensated inter-frame coding (motioncompensated inter-framecoding) 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 inse...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/50
CPCH04N19/11H04N19/13H04N19/182H04N19/186
Inventor 国玫郭峋雷少民
Owner HFI INNOVATION INC