Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for intra prediction using cross-component linear model

A linear model, component technology, applied in the field of video encoding and decoding, which can solve problems such as quality degradation

Active Publication Date: 2020-04-10
HUAWEI TECH CO LTD
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the higher the resolution of the video, the more bandwidth is usually required because the video has more information. To reduce bandwidth requirements, video coding standards involving video compression have been introduced. Or reduce the corresponding memory requirements when storing) This reduction usually results in a loss of quality Therefore, video coding standards try to find a balance between bandwidth requirements and quality

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for intra prediction using cross-component linear model
  • Method and apparatus for intra prediction using cross-component linear model
  • Method and apparatus for intra prediction using cross-component linear model

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0109] First embodiment: using samples in the adjacent row above the reconstructed luminance sample and samples in the adjacent column to the left

[0110] According to the first embodiment, the adjacent original reconstructed luminance samples in the upper adjacent row are A1[i] (i≥0 and ≤2W-1) and the adjacent original reconstructed luminance samples in the left adjacent column are L1 [i] (i≥0 and ≤2H-1).

[0111] The adjacent chroma samples in the upper row are A[i] (i≥0 and ≤W-1) and the adjacent chroma samples on the left are L[i] (i≥0 and ≤H-1).

[0112] If the maximum and minimum luma values ​​(collectively the max / min values) are in the upper adjacent row, and the index of the sample position is M, then the position of the corresponding chroma sample is M / 2, and the corresponding chroma value is A[M / 2].

[0113] If the max / min values ​​are in the left column and the index of the sample position is N, then the corresponding chroma sample is at position N / 2 and the cor...

no. 2 example

[0120] Second embodiment: using the adjacent row above and three adjacent columns to the left of the reconstructed luminance samples

[0121] According to the second embodiment, only 1 row of luminance reconstruction samples will be used to obtain maximum / minimum luminance values, while the three columns on the left can be used to obtain maximum / minimum luminance values. In other words, according to the second embodiment, the maximum / minimum luminance values ​​will be obtained in the original reconstructed luminance samples in the upper row and the downsampled luminance samples in the left column.

[0122] refer to Figure 12A , the adjacent original reconstructed luma samples in the upper row are A1[i] (i≥0 and ≤2W−1). refer to Figure 12B , the downsampled adjacent luma samples in the left column are L4[i] (i ≥ 0 and ≤ H−1).

[0123] refer to Figure 12C , the adjacent chroma samples in the upper row are A[i] (i≥0 and ≤W-1) and the adjacent chroma samples in the left col...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An method for encoding a video data block includes down-sampling a reconstructed luma block to obtain a down-sampled luma block, determining a max luma value and a min luma value from reconstructed neighboring luma samples above the reconstructed luma block or reconstructed neighboring luma samples left of the reconstructed luma block, deriving, based on positions of the max luma value and the minluma value, a first chroma value and a second chroma value corresponding to the respective max luma value and min luma value from reconstructed neighboring chroma samples of the target chroma block,calculating parameters of a cross-component linear model (CCLM) prediction mode based on the max and min luma values and the first and second chroma values, and generating predicted chroma values of the target chroma block based on the parameters and the down-sampled luma block.

Description

[0001] Related Applications Cross Application [0002] This application claims priority from an earlier application, U.S. Provisional Patent Application No. 62 / 698,279, filed July 15, 2018, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to video encoding and decoding, and more particularly to the technique of intra-frame predictive encoding using cross-component linear models. Background technique [0004] Digital video has been widely used since the advent of DVD discs. Digital video is first encoded and then transmitted using a transmission medium. The viewer receives the video and uses a viewing device to decode and display it. For high reasons, video quality has improved. This has brought about larger data streams, which are now commonly transmitted over the Internet and mobile communication networks. [0005] However, the higher the resolution of the video, the more bandwidth is usually required because...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/117H04N19/176H04N19/593
CPCH04N19/105H04N19/167H04N19/176H04N19/186H04N19/593
Inventor 马祥赵寅杨海涛陈建乐
Owner HUAWEI TECH CO LTD