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Method for reducing image blocking effect

A block effect and image block technology, applied in the field of network communication, can solve the problems of feasibility, compression and coding efficiency, etc.

Inactive Publication Date: 2006-12-20
HUAWEI TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0047] The biggest problem with this type of method is efficiency. Imagine that if 8×8 blocks overlap 4 pixels between adjacent blocks, then there will be nearly 300% more blocks in the entire image than when the blocks do not overlap. 2 pixels are overlapped between the blocks, and the increase of the block is also nearly 80%, so that the compression coding complexity of the entire image increases in an approximate square relationship with the increase in the number of overlapping pixels between the blocks. Therefore, the feasibility of this method There is a big problem in compression coding efficiency

Method used

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Embodiment Construction

[0093] It can be seen from the description of the prior art that the essential reason for the block effect in the current B-DCT video compression coding method is that each image block independently performs the DCT coefficient quantization process, so that the size of the DCT coefficient quantization error introduced by each image block and its The distribution properties are independent of each other, resulting in discontinuities at the boundaries of adjacent image patches.

[0094] Continuing with the example in the prior art, if the two blocks f adjacent to the left and right in the above example 1 and f 2 The DC coefficient in the DCT quantization coefficient of is:

[0095] F ^ f 1 , Q ( 0,0 ) = 1 , F ...

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Abstract

The invention relates to a method for reducing the image block effect, which is characterized in that: fixing the value range of image block DCT; based on the pixel information of nearby blocks and said value range, adjusting the DCT of image block; based on the adjust result, compressing and coding the image block. The invention can relate the DCT error of nearby blocks with its distribution character, to connect the edges of nearby blocks, without hurting the detail of image while reducing the block effect. The invention can distinguish the edge caused by the image pattern edge and the block effect. And it can be compatible compression code technique based on B-DCT technique, to improve the quality of video.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for reducing image square effects. Background technique [0002] Block Artifacts (Block Effects) is a phenomenon artificially introduced in the process of video compression and encoding of digital images, which is not found in natural images, so it is also called block artifacts. [0003] The current mainstream video compression coding technologies such as MPEG-1 / MPEG-2 / MPEG-4 part2, part 10, H.261 / H.263 / H.263+ / H.263++ / H.264 and other international standards are Based on the DCT (Discrete Cosine Transform) method, the DCT method is also called the B-DCT (Block-based DCT) compression coding method. This method transforms the space domain (Space Domain) image information into the frequency domain (Frequency Domain) through DCT transformation. Therefore, the energy of the image signal is concentrated on a few DCT coefficients such as DCT direct current coeffi...

Claims

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Application Information

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IPC IPC(8): H04N7/26
CPCH04N19/00593H04N19/527
Inventor 罗忠杨付正万帅常义林
Owner HUAWEI TECH CO LTD
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