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Method of cross color intra prediction

A technology of intra-frame prediction and intra-frame prediction mode, which is applied in the field of coding technology and can solve problems such as increasing computational complexity and increasing buffer requirements

Active Publication Date: 2015-08-26
MEDIATEK INC
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although zhang's method significantly improves performance, it also increases computational complexity and buffer requirements

Method used

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  • Method of cross color intra prediction
  • Method of cross color intra prediction
  • Method of cross color intra prediction

Examples

Experimental program
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Effect test

example 1

[0035] Example 1: Fine-grained weighted LM predictor. In this example, each sample to be predicted has its own weight value based on its position.

[0036] w = ( 1 - x c x c + y c ) .

example 2

[0037] Example 2: Switching weight LM predictors. Using only two weight values, and switching between the two values ​​by comparing the distance between the top block border and the left block border,

[0038]

[0039] In yet another embodiment of the invention, the multi-LM chroma mode uses multiple lines to increase the accuracy of the LM parameters and also uses the distance weighted LM chroma mode.

[0040] Although linear model-based inter-color (also known as cross-color) is shown for chroma intra prediction using reconstructed luma samples, linear model-based inter-color can also Applies to other color systems. For example, the color components may correspond to red (R), green (G) and blue (B).

[0041] The above described intra prediction of one color component using a linear model based on another encoded color component can be extended to scalable video coding or 3D / multi-view coding. For example, the current block in the dependent view may be based on intra pr...

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Abstract

A method for cross-color Intra prediction using the LM Intra mode using multi-row or multi-column neighboring reconstructed pixels for LM parameter derivation or using only top pixels or left pixels of neighboring pixels is disclosed. Multiple LM Intra modes can be used. For example, three LM Intra modes can be used and the LM parameters for the three LM Intra modes can be determined based on only the top pixels, only the left pixels and both the top pixels and left pixels of neighboring reconstructed pixels respectively. To remove the need for additional buffer requirement for deriving the LM parameters based on using multi-row or multi-column neighboring reconstructed pixels, the current method re-uses existing buffers, where the buffers are used for deblocking. A syntax element can be used to indicate one of the multi-LM modes selected.

Description

[0001] cross reference [0002] This application claims priority to US Provisional Patent Application No. 61 / 805,310, filed March 26, 2013, entitled "Improved Chroma LM Mode." These US Provisional Patent Applications are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to video coding, and in particular to coding techniques related to intra-frame prediction using inter-color linear patterns of reconstructed pixels based on another color. Background technique [0004] Motion compensated interframe coding has been widely used in various coding standards, such as MPEG-1 / 2 / 4 and H.261 / H.263 / H.264 / AVC. Although motion-compensated inter-frame (inter-frame) coding can effectively reduce the bit rate of compressed video, intra-frame (Intra) coding is required to compress regions with large motion or scene changes. In addition, intra coding is also used in the processing of initial pictures or periodically inserting I-pictu...

Claims

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Application Information

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IPC IPC(8): H04N19/159
CPCH04N19/00H04N19/593H04N19/186H04N19/59H04N19/11H04N19/159H04N19/182H04N19/597H04N19/82
Inventor 陈庆晔徐志玮蔡家扬黄毓文
Owner MEDIATEK INC
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