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Loop filtering method in image coding processing

A technology of loop filtering and image coding, which is applied in the field of image coding processing, and can solve problems such as single filter operator, difficulty in achieving filtering effect, and high-intensity smoothing filtering in uneven areas.

Active Publication Date: 2006-11-22
HUAWEI TECH CO LTD
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Problems solved by technology

[0017] It can be seen that the above-mentioned existing loop filtering process ignores the fact that the block effect is easier to be perceived by the human eye in the flat area, so it does not perform high-intensity smoothing filtering for the flat area
Moreover, in the above method, the filtering operator has only 3 levels (0, 1, 2). Since the filtering operator is too single, it is difficult to achieve a good filtering effect, which makes the corresponding method suitable for limited occasions.

Method used

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Embodiment Construction

[0080] The purpose of the present invention is to provide a loop filtering method, which can effectively remove the block effect, so that the subjective quality of the decoded image is improved, objectively, the peak signal-to-noise ratio is improved, and the code rate is reduced.

[0081] The specific implementation of the method provided by the present invention will be described below with reference to the accompanying drawings, wherein the encoding block boundary is an 8×8 block boundary, and the method is similar for the case of a 4×4 block boundary. like figure 2 As shown, it specifically includes the following processing procedures:

[0082] First, the block effect value strength needs to be calculated;

[0083] Step 21: Count the number num of similar points in the block boundary area;

[0084] The so-called similar points are points whose pixel value difference is less than a predetermined value, and the predetermined value can be set values ​​such as 2, 3, etc., a...

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Abstract

The invention relates to a loop filter method used in image code process. Wherein, it comprises: first, calculating the number of similar points in the margin of filtered code block, and according to said number and if there is frame internal block, to decide the block effective value of said code block; then according o the pixel difference between two sides of block margin, judging if the block margin is the real edge of picture; at last, processing filter treatment on the code block according to the block effective value, when it is false edge. The invention improves the flat area filtration, to obtain better effect on the block removal effect of flat area.

Description

technical field [0001] The present invention relates to the technical field of image coding processing, in particular to a loop filtering method in image coding processing. Background technique [0002] With the development of multimedia technology and the rapid promotion of multimedia applications, the H.264 video image compression standard formulated by JVT, a standard formulation working group jointly formed by MPEG and ITU, is characterized by its advanced technical characteristics and better compression It has been widely used in conference TV, videophone, streaming media, HD DVD, video surveillance, digital TV, 3G and other fields. [0003] H.264 compression processing framework such as figure 1 As shown, the basic processing unit is 16×16 macroblock, which adopts multi-frame reference, intra-frame prediction, multi-macroblock mode, 4×4 integer transformation and quantization, loop filtering, 1 / 4 pixel motion prediction, CAVLC ( Context-based variable length coding a...

Claims

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Application Information

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IPC IPC(8): H04N7/26
CPCH04N19/527H04N19/107H04N19/117H04N19/176H04N19/61H04N19/82
Inventor 熊联欢徐士麟喻莉朱光喜
Owner HUAWEI TECH CO LTD
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