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

Intra-frame prediction method and device for image block

An intra-frame prediction and image block technology, applied in the field of image processing, can solve the problem of high encoding and decoding overhead

Active Publication Date: 2019-09-24
HUAWEI TECH CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a method and device for intra-frame prediction of image blocks to solve the problem of high encoding and decoding overhead

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
  • Intra-frame prediction method and device for image block
  • Intra-frame prediction method and device for image block
  • Intra-frame prediction method and device for image block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213] Embodiment one, see Figure 11A As shown, the first selection method is described in detail.

[0214] S1101. Obtain the prediction mode adopted by the chrominance component of the current block.

[0215] Specifically, if in the decoding process, the code stream information can be analyzed to obtain the index value of the coding mode of the chroma component of the current block, and the prediction mode of the coding of the chroma component of the current block can be obtained through the index value. For example, if the binary bit stream of the prediction mode encoded by the chroma component of the current block is analyzed to be 1110, then according to Table 3, it can be known that the prediction mode of the chroma component of the current block is Planar mode; if the prediction mode of the chroma component of the current block is If the binary code stream is 110, it can be seen from Table 3 that the prediction mode of the chrominance component of the current block is ...

Embodiment 2

[0227] Embodiment two, see Figure 12 As shown, the second selection method is described in detail. The difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, the luminance component prediction mode is not used for judgment, but by comparing the average gradient value of the upper template and the left template in the luminance block, the current Whether the block chroma component uses the LMA mode in the MDLM mode or the LML mode.

[0228] S1201-S1202, for details, refer to steps S1101-S1102, which will not be repeated here.

[0229] S1203, according to the average gradient value of the luminance component of the left reference pixel of the current block and the average gradient value of the luminance component of the upper reference pixel of the current block, determine the prediction adopted by the chrominance component of the current block The mode is the LMA mode or the LML mode.

[0230] Specifically, the downsampled luminance block rec' of the curr...

Embodiment 3

[0239] Embodiment three, see Figure 13 As shown, the third selection method is described in detail. The difference between Embodiment 3 and Embodiment 1 and Embodiment 2 is that in Embodiment 3, by comparing the width value and height value of the current block, it is adaptively judged whether the chrominance component of the current block uses the LMA mode or the LML in the MDLM mode. model.

[0240] S1301-S1302, for details, refer to steps S1101-S1102, which will not be repeated here.

[0241] S1303. Determine, according to the width value and the height value of the current block, that the prediction mode adopted by the chrominance component of the current block is the LMA mode or the LML mode.

[0242] Specifically, if the width value of the current block is greater than the height value, it is determined that the prediction mode adopted by the chrominance component of the current block is the LML mode. If the height value of the current block is greater than the width...

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

The invention discloses an intra-frame prediction method and device for an image block, which are used for solving the problem of high coding and decoding expenditure. The method comprises the following steps: determining a prediction mode adopted by a chroma component of a current block as an MDLM mode, wherein the MDLM comprises an upper template linear model LMA mode and a left template linear model LML mode; determining that the prediction mode adopted by the chroma component of the current block is an LMA mode or an LML mode according to a pre-configuration strategy, wherein the LMA mode is a mode of calculating a chroma component prediction value of the current block based on an upper side reference pixel of the current block, and the LML mode is a mode of calculating the chroma component prediction value of the current block based on a left side reference pixel of the current block; and obtaining a chrominance component prediction value of the current block according to the determined prediction mode adopted by the chrominance component of the current block.

Description

technical field [0001] The present application relates to the technical field of image processing, and in particular to a method and device for intra-frame prediction of image blocks. Background technique [0002] The intra-frame prediction technology is used in the existing video image coding and decoding technology. Intra-frame prediction refers to using reference pixels in the reconstructed block in the image where the current block is located to predict the current block. Generally, the pixels of the reconstructed neighboring blocks around the current block are used to obtain the predicted value of the pixels in the current block. [0003] Currently, a multi-direction linear model (multi-direction linear model, MDLM) mode is added when intra-frame prediction is performed on the chrominance component of an image. The difference between the MDLM mode and the linear model (LM) is that the LM mode uses the reconstruction value of the luminance component of the current bloc...

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
IPC IPC(8): H04N19/159H04N19/186
CPCH04N19/159H04N19/186
Inventor 马祥杨海涛陈建乐
Owner HUAWEI TECH CO LTD
PatSnap Eureka logo

PatSnap Eureka turns technology decisions into work you can execute. Powered by our Innovation Knowledge Graph, it runs expert workflows across engineering, life sciences, materials and intellectual property. Get your review-ready output in minutes.

X (Twitter)LinkedInYouTubeSubstack

© 2026 PatSnap. All rights reserved. 

Terms of Service

 | 

Privacy policy

 | 

Modern Slavery Act Transparency Statement