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

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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