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

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...

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