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Method for improving image intraframe coding velocity

An image frame and intra-coding technology, applied in image communication, television, electrical components, etc., can solve complex pre-calculation problems

Inactive Publication Date: 2008-08-20
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods improve the speed of intra-frame coding to a certain extent, but at the same time introduce complex calculations in the early stage, so there are limitations. Among them, the algorithm proposed by FengPan is recognized as the best among many algorithms, and has been adopted by the JVT organization

Method used

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  • Method for improving image intraframe coding velocity
  • Method for improving image intraframe coding velocity
  • Method for improving image intraframe coding velocity

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Embodiment 1

[0079] 1. Texture direction estimation

[0080] As we all know, natural images have strong spatial correlation, and the texture direction between adjacent macroblocks is also very similar, especially for 4×4 small blocks, the correlation is stronger. like Figure 4 Shown is the first frame image of the Foreman (QCIF) sequence, Figure 5 is the 69th macroblock in the image, Image 6 What is shown in the middle white box is the 12th 4×4 small block of the 69th macroblock. It can be seen from the figure that the texture trends between adjacent macroblocks (or blocks) are very similar. The texture direction estimation is performed on the 4×4 luma, 16×16 luma and 8×8 chrominance blocks respectively in the following.

[0081] (1) 4×4 block texture direction estimation

[0082] First, the adjacent boundary pixels are extended into two lines, such as Figure 7 shown. According to the 9 prediction directions proposed in the standard, define 4 texture directions: 0°, 45°, 90° and...

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Abstract

The present invention discloses a method for increasing the encoding speed in the image frame basing on the H.264 standard. The method filters the estimating mode along the grain direction according to the grain direction of the image, and then executes RDO calculation thereby greatly reducing the calculating time of the RDO. The method of the invention effectively increases the image encoding speed on the base that the excellent image quality is kept.

Description

technical field [0001] The invention relates to video compression coding technology, in particular to a method for improving the intra-frame coding rate based on H.264 images. Background technique [0002] There are many methods of video / image coding, and its applications involve all aspects. In order to enable terminals produced by different manufacturers to exchange information with each other, or receive information from a common signal source, some international organizations began to work on video in the late 1980s. / Standardization of image coding. At the same time, major manufacturers are interested in this, and directly promote the research process of video / image coding standardization. Finally, in 1988, the International Telephone and Telegraph Consultative Committee (CCITT, International Telephone and Telegraph Consultative Committee, renamed ITU-T, International Telecommunication Union Telecommunications Standardization Sector in 1992) formulated the first video ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/124H04N19/13H04N19/176H04N19/513H04N19/593H04N19/61
Inventor 邓中亮段大高
Owner BEIJING UNIV OF POSTS & TELECOMM
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