Method and device for removing block effect in video coding-decoding system

A technology for video coding and block removal, which is applied in the field of video coding and decoding systems, can solve problems such as image distortion and inability to remove block effects, and achieve the effects of reducing the chance of distortion, small space-time complexity, and good visual effects

Inactive Publication Date: 2005-12-28
XIAMEN OVERSEAS CHINESE ELECTRONICS ENTERPRISE
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Problems solved by technology

[0006] The present invention provides a method and device for removing block effect in a video encoding and decoding system, the purpose of which is to overcome the existing method for removing block effect and make the original image smooth even when there is indeed a discontinuity at the edge of the block. As a result, new distortions are generated in the image, and it cannot really remove the defect of block effect.

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  • Method and device for removing block effect in video coding-decoding system
  • Method and device for removing block effect in video coding-decoding system
  • Method and device for removing block effect in video coding-decoding system

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Embodiment Construction

[0033] The specific embodiment of the present invention, refer to figure 2 , is a structural schematic diagram of the device of the present invention, which includes a DCT coefficient matrix norm calculation device 1, a quantization matrix DCT transform norm calculation device 2, a relative quantization step size calculation device 3, a comparator 4 and a smoothing processing device 5, wherein the relative Quantization step size calculation device 3 is connected to DCT coefficient matrix norm calculation device 1 and quantization matrix DCT transformation norm calculation device 2, comparator 4 is connected to relative quantization step size calculation device 3, and comparator 4 is also connected to smoothing processing device 5 The DCT coefficient matrix norm calculation device 1 is provided with a DCT coefficient matrix input terminal 11 , and the quantization matrix DCT transformation norm calculation device 2 is provided with a quantization matrix DCT transformation input...

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Abstract

The method includes following steps: after decoding, acquires norm NDCT of DCT coefficient matrix of current macro block / sub block; calculates the transformed norm Nq of quantify matrix set by the current macro block / sub block; calculates relevant quantify step size of DCT coefficient matrix being relative to transformation of quantify matrix DCT, a=Nq / NDCT; compares a with experience-threshold k; if a<k, then ends the process. If a>k, then makes smoothing process for current macro block / sub block and their neighboring pixels. The unit used in video encode and decode system consists of DCT coefficient matrix norm calculating device, quantify matrix DCT transformation calculation device, relevant quantify step size calculation device, comparator and smooth-processing device.

Description

technical field [0001] The present invention relates to a method and a device adopted by a video coding and decoding system, and more specifically refers to a method and a device for removing block effects in a video coding and decoding system. Background technique [0002] There are many kinds of video coding and decoding standards, and the video coding and decoding standards that have become industry standards include H.261, H.263, H.264, MPEG-1, MPEG-2, and MPEG-4. These standards all adopt the method of dividing the video image to be coded into several macroblocks, and each macroblock is divided into several subblocks, and each subblock is subjected to discrete cosine transform, that is, DCT transform, to generate a set of DCT coefficients, and then Then quantize the set of DCT coefficients. [0003] The DCT transform approximates the optimal transformation of energy concentration, that is, the characteristics of the K-L transform. Its energy concentration characteristi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/86
Inventor 贾天旭田东红苏钟人
Owner XIAMEN OVERSEAS CHINESE ELECTRONICS ENTERPRISE
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