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A Method of Intra-Color Prediction

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

Active Publication Date: 2018-03-16
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Method of Intra-Color Prediction
  • A Method of Intra-Color Prediction
  • A Method of Intra-Color Prediction

Examples

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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]

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). According to an embodiment of the present invention, the first color pixel corresponds to a luma pixel or a green color pixel, and the second color pixel corresponds to a chrominance pixel or a blue / red color pixel.

[0041] The above described intra prediction of one color...

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Abstract

The present invention proposes an inter-color intra prediction method using a linear model intra mode, which uses multiple rows or columns of adjacent reconstructed pixels or only uses the top or left pixels of adjacent pixels for linear model parameters derivation. The present invention also proposes that multiple linear model intra modes can be used. For example, three linear model intra modes and their linear model parameter derivation based on only the top pixel of neighboring reconstructed pixels, only on the left side of neighboring reconstructed pixels, and based on neighboring Reconstruct the top pixel and left pixel of the pixel. In order to obtain linear model parameters based on using multiple rows or columns of adjacent reconstructed pixels without requiring additional buffers, the method provided by the present invention reuses the existing buffers used for deblocking. Additionally, a syntax element may be used to indicate a selected one of a plurality of linear model modes.

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