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Filtering-wave method of removing blocking-effect in video-frequency picture and loop filter

A video image and block effect technology, applied in the multimedia field, can solve the problems of video image block effect and subjective quality degradation of video image, etc.

Inactive Publication Date: 2006-08-09
TENCENT TECH (SHENZHEN) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the quantization operation introduced in the video compression process is a lossy compression, it is easy to cause the block effect of the video image, that is, the so-called "mosaic" phenomenon may appear in the received image, resulting in the subjective quality of the video image. decline

Method used

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  • Filtering-wave method of removing blocking-effect in video-frequency picture and loop filter
  • Filtering-wave method of removing blocking-effect in video-frequency picture and loop filter
  • Filtering-wave method of removing blocking-effect in video-frequency picture and loop filter

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Embodiment 1

[0074] The method described in this embodiment divides the blocking effect between adjacent small blocks into 5 levels, and uses the block effect value Bs parameter to represent the blocking effect level between adjacent small blocks, and the value range of this parameter is 0 to 4, where the larger the Bs value, the more serious the block effect between adjacent small blocks, and the stronger the smoothing filter processing is required.

[0075] The filter decision method described in this embodiment includes the following steps:

[0076] Step 11: Perform edge detection on the input two adjacent small blocks according to the pixels of the input two adjacent small blocks, and judge whether there is a real edge on the boundary of the adjacent small block, if there is a real edge, then It is determined that filtering is not required for the input adjacent small blocks, and then the filtering decision process is ended; otherwise, step 12 is performed.

[0077] In this step, desc...

Embodiment 2

[0113] In order to solve the above problems and reduce the complexity and calculation amount of the smoothing filtering algorithm, this embodiment provides a simplified filtering method for removing video image block effects, which simplifies the filtering method described in Embodiment 1. This method divides the block effect between adjacent small blocks into three levels, which are also represented by the block effect value Bs parameter. The value range of this parameter is from 0 to 2, corresponding to the three levels of smoothing filter strength, respectively. That is no filtering, weak filtering and strong filtering. Among them, for the adjacent small block whose blocking effect value Bs is 0, no filtering will be performed; for the adjacent small block whose blocking effect value Bs is 1, weak filtering will be performed, and the corresponding blocking effect value Bs is 2, strong filtering will be performed.

[0114] The filtering method of the present invention also ...

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Abstract

The method includes two parts: filtering decision and filtering execution. The filtering decision includes steps: based on pixels of received image and coding information to determine whether there is real edge existed on borderline of two adjacent small blocks; determining value of block effect of each two adjacent small blocks; there is one-to-one correspondence between different values of block effect and different filtering strengths. The filtering execution includes steps: not carrying out filtering operation for adjacent small blocks of containing real edge on borderline; carrying out filtering operation for adjacent small blocks of not containing real edge on borderline by using selected filtering method corresponding to filtering strength based on values of block effect. Filtering inputted video images, the disclosed method removes block effect caused by blocked encoding so as to raise quality of video image.

Description

technical field [0001] The invention relates to video image smoothing and filtering technology in the multimedia field, in particular to a filtering method for removing block effects in video images and a loop filter for realizing the method. Background technique [0002] In the process of video compression coding, in order to eliminate the spatial correlation of video image data frames, the pixels of each frame are usually divided into several N×N pixel blocks, called macroblocks. Generally, N is 16. Among them, each macroblock can be further divided into one 16×16 or several 8×8, 16×8, 8×16 or 4×4 small blocks, and in the encoding process of the video image, the The divided small block is the basic unit of video coding and motion estimation. The above-mentioned method for encoding pixels in blocks can reduce the information redundancy in the space of the video image data frame, and realize the compression of the amount of data required for video image transmission. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/117H04N19/80
Inventor 文强
Owner TENCENT TECH (SHENZHEN) CO LTD
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