Method and system for removing self-adaptive block effect
A block effect and self-adaptive technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of blurred details and loss of image content, achieve the effect of flexible processing and accurate video results
Inactive Publication Date: 2014-12-03
RICOH KK
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For different image contents, the degree of block effect is actually different in human eyes. Therefore, if a unified smooth deblock effect strategy is adopted without considering the content of block effect, it will lead to excessive blurring of image content or loss of detail information. lost
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[0024] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to embodiments and drawings.
[0025] figure 1 Shown is a flowchart of an adaptive deblocking method based on time domain and space domain according to the present invention. The adaptive deblocking method based on the time domain and the spatial domain of the present invention runs in an image processing system, which is also referred to as a deblocking system hereinafter. Such as figure 1 As shown, according to the time domain and spatial domain-based adaptive deblocking method of the present invention, first, at step S10, the input video is received, and the currently input video frame is re-blocked. Usually a frame of image is composed of multiple image blocks. Generally, an image block is composed of 8×8 pixels. figure 2 Shown is a schematic diagram of the process of re-dividing an input...
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The invention provides a method for removing self-adaptive block effect, which includes partitioning a current frame of input video again to enable two central axes of each novel block which is divided again to right be borders of original blocks in the horizontal direction and the vertical direction of four adjacent original blocks; calculating difference value of pixels on two sides of the borders of the original blocks and difference value of pixels in the original blocks on two sides; and determining whether the calculated the difference value of the pixels on two sides of the borders of the original blocks is larger than the difference value of the pixels in the original blocks on two sides of the borders of the original blocks and whether the difference value of the pixels on two sides of the borders of the original blocks exceeds a predefined threshold. If the difference value of the pixels on two sides of the borders of the original blocks is larger than the e difference value of the pixels in the original blocks on two sides of the borders of the original blocks and the difference value of the pixels on two sides of the borders of the original blocks does not exceed the predefined threshold, an optimal matching novel block is sought in adjacent frames before and after the current frame, and the found optimal matching novel block in the adjacent frames is adopted to update the novel block in the current frame.
Description
Technical field [0001] The present invention relates to a method and a system for removing blockiness in the fields of video compression and video enhancement, and in particular, provides a method and system for removing blockiness in a video signal adaptively based on time domain and space domain. Background technique [0002] In the process of video compression and video enhancement in which video is divided into blocks, the video frame will produce a block effect between blocks, that is, a mosaic phenomenon can be seen by the human eye. In order to eliminate this blocking effect, the prior art proposes various ways to eliminate the blocking effect, including technical means based on the time domain and spatial domain to eliminate the blocking effect. [0003] US Patent US5512956A proposes a post-processing method for low bit rate image sequences based on time domain and spatial domain to eliminate block effects. In this patent, a separable three-dimensional filter structure bas...
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IPC IPC(8): H04N19/86H04N19/159H04N19/176H04N19/182
Inventor 王晓萌刘丽艳宫卫涛
Owner RICOH KK