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A loop filter and filtering method

A loop filtering and thresholding technology, applied in the field of video coding and video image, can solve problems affecting coding efficiency and subjective quality

Inactive Publication Date: 2005-01-26
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0004] When using motion prediction, the block boundary of the reference image usually does not fall exactly on the block boundary of the current coded image, such as image 3 As shown, there is also a boundary effect inside the block in the coded reconstructed image, which seriously affects the coding efficiency and subjective quality

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Embodiment Construction

[0016] In order to improve the coding efficiency and the subjective quality of the reconstructed image, in the traditional hybrid coding process ( figure 1 ), after obtaining the reconstructed image, before putting it into the frame buffer Frame Buffer, perform deblocking filtering, such as Figure 4 shown. Since this filter is in the encoding loop, it can also be called a loop filter.

[0017] The specific process is as follows:

[0018] Divide the image frame to be encoded into blocks of equal size, use the encoded data of the current frame for intra-frame prediction, or use the previously encoded frame data; perform inter-frame prediction through motion compensation (MC: Motion Compensation), after obtaining the predicted value, the The current value is subtracted from the predicted value to obtain the residual value, and the residual value is subjected to discrete cosine transform (DCT: Discrete CosineTransform); the transformed coefficient is quantized (Quan: Quantify),...

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Abstract

This invention relates to video encoding and video image technology field, especially a kind of loop filter and its filtering method. The feature is that 1) filtering weighting is got according to block type and prediction motion vector judgment between frames. 2) Filtering valve value is got according to filtering weighting and the quantification of boundary both sides encoding block. 3) Filtering is decide according to the boundary both sides sample value and filtering valve value. This invention can be applied to video encoding design.

Description

technical field [0001] The invention relates to the technical fields of video coding and video images, in particular to a loop filter and a filtering method. technical background [0002] Modern video coding began in the late 1980s. From MPEG-1, H.261 to the current MPEG-4, H.264, there has been a long research history, and many international standards have been proposed, but the basic idea is still based on block transformation , hybrid coding of motion prediction and entropy coding, the basic process is as follows figure 1 shown. Divide the image frame to be encoded into blocks of equal size, use the encoded data of the current frame for intra-frame prediction, or use the previously encoded frame data to perform inter-frame prediction through motion compensation (MC: Motion Compensation). After obtaining the predicted value, subtract the current value from the predicted value to obtain the residual value, perform discrete cosine transform (DCT: Discrete CosineTransform) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/82
Inventor 彭聪樊建平黄晁宋磊
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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