Low-complexity in-frame estimation mode selection method

An intra-frame prediction mode, low-complexity technology, used in television, electrical components, digital video signal modification and other directions, can solve the problems of large amount of calculation and low practicability, and achieve the effect of reducing the amount of calculation and improving real-time performance.

Inactive Publication Date: 2008-05-07
ZTE CORP
View PDF2 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to determine the magnitude and angle of the edge vectors of all pixels in the block, and...

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
  • Low-complexity in-frame estimation mode selection method
  • Low-complexity in-frame estimation mode selection method
  • Low-complexity in-frame estimation mode selection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The main idea of ​​the present invention is to process the intra-frame prediction mode selection by simplifying the calculation function of the cost value (Cost) and reducing the number of modes to be verified. Usually a 4×4 luminance block has less details, and the texture structure is relatively smooth, so the Cost value calculation function can be simplified by reducing the number of sample points that need to be calculated in the 4×4 luminance block. In addition, in intra prediction based on 4×4 luma blocks, the optimal prediction mode usually has a similar direction to the suboptimal prediction mode; and when the QP is large (such as 40), the penalty factor 4λ in other modes (QP) will increase, so the most probable prediction mode is usually the optimal prediction mode; especially, in areas where the image content is very mixed, it is impossible for any prediction mode to achieve good prediction results.

[0041] Taking the 4×4 block shown in Figure 1 as an example...

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 present invention discloses a low-complexity method of intraprediction mode selection, two groups of sample points representing texture characteristics are extracted from the current block, according to the cost values of adjacent blocks, a threshold is calculated. The method includes four steps; firstly, the method judges if the current block is located at the special position of an image frame, if yes, an optimal prediction mode at the special position is calculated and then exported, and calculation is finished; secondly, if not, the cost value of the current block under the most possible prediction mode is calculated, if the cost value is less than the threshold, then the mode is exported, and the calculation is finished; thirdly, otherwise, a mode with the least cost value is selected from all non most possible prediction modes and used as a temporary optimal prediction mode; fourthly, the cost value of the most possible prediction mode is compared with the cost value of the temporary optimal prediction mode, and the mode with the least cost value is used as an optimal prediction mode and exported. Because the present invention selects a characteristic point to replace the whole data block, on the premise that the video encoding quality is not obviously affected, the present invention notably reduces the calculation load of the intraprediction mode selection and increases the real-time performance of video encoding.

Description

technical field [0001] The invention belongs to the field of video information compression, and in particular relates to a low-complexity intra-frame prediction mode selection method. Background technique [0002] The current advanced video coding standards include the intra-frame prediction function, which uses the sample points of adjacent blocks to extrapolate to realize the prediction of the current block, so as to better eliminate the spatial redundancy in the single-frame image, so that only the The residual of the predicted block and the current block is encoded. Especially in the region where the change is flat, the bit rate can be greatly reduced by using intra prediction. [0003] When a macroblock is coded in intra-frame mode, a prediction block P is constructed using previously coded and reconstructed blocks. For the luma component, a prediction block P can be created for each block or macroblock. For example, in the H.264 encoding standard, there are 9 option...

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): H04N7/32H04N19/159H04N19/593
Inventor 梁立伟左雯王宁
Owner ZTE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap