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Chroma Intra Prediction Method and Device

An intra-frame prediction and chroma technology, applied in the field of coding technology, can solve problems such as signal aliasing, and achieve the effect of flexible chroma intra-frame prediction

Active Publication Date: 2017-08-01
HFI INNOVATION INC
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  • Claims
  • Application Information

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Problems solved by technology

Subsampling processing can lead to signal aliasing, subsampling processing is used in some signal processing systems because of its simplicity

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  • Chroma Intra Prediction Method and Device
  • Chroma Intra Prediction Method and Device
  • Chroma Intra Prediction Method and Device

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Embodiment Construction

[0020] As mentioned above, the current LM mode is not flexible and does not work when the chroma pixels do not correspond to the 4:2:0 sampling format. Correspondingly, multiple embodiments of the present invention provide flexible luma-based chroma intra-frame prediction, which can adaptively support different chroma sampling formats.

[0021] In current HEVC, several different sampling formats are supported. For example, the sampling format can be selected from 4:2:0, 4:2:2 and 4:4:4. In some chroma sampling formats, the number of chroma sample values ​​is half the number of luma sample values ​​in the horizontal direction or both horizontal and vertical directions. In this case, the sampling positions of the chroma pixels may be aligned or offset from the sampling positions of the luma sampling values. In other words, there may be a phase difference between corresponding luma pixels and chroma pixels. figure 2 Schematic diagram of an example phase relationship for a 4:2...

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Abstract

A method and apparatus for luma-based chroma intra prediction for a current chroma block are disclosed. The chroma intra predictor is derived from reconstructed luma pixels of a current luma block according to the chroma sampling format. Depending on the chroma sampling format, either sub-sampling, down-sampling or no processing is applied to the reconstructed luma pixels in horizontal or vertical direction. The information associated with the chroma sampling format can be incorporated in the sequence parameter set (SPS), the picture parameter set (PPS), the adaptation parameter set (APS) or the slice header of a video bitstream.

Description

[0001] cross reference [0002] The present invention claims the priority of the PCT patent application No. PCT / CN2012 / 070009 filed on January 4, 2012 and the title of the invention is "Improvements of Luma-based Chroma Intra Prediction". The entire content of the PCT patent application is here Cite and incorporate references. technical field [0003] The present invention relates to video coding, and more particularly, the present invention relates to coding techniques related to chroma intra prediction based on reconstructed luma pixels. Background technique [0004] Motion-compensated inter-frame coding has been widely used in various coding standards, such as MPEG-1 / 2 / 4 and H.261 / H.263 / H.264 / AVC. Compared with motion-compensated inter-frame coding, which can effectively reduce the bitrate of compressed video, intra-frame coding (intra coding) is used to compress regions with large motion or scene changes. In addition, intra-frame coding is also used to process the ini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/593H04N19/59
Inventor 雷少民郭峋
Owner HFI INNOVATION INC