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De-block effect method based on block effect detection

A technology to remove block effect and block effect, which is applied in the field of video processing, can solve the problems of limited application and high computing overhead, and achieve the effects of improving search speed, removing block effect, and overcoming "occlusion" and "revealing" effects

Inactive Publication Date: 2011-02-09
CHONGQING UNIV
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Problems solved by technology

[0006] Moreover, the disadvantages of the blockiness detection algorithm based on the spatial domain are: first, false detection and missed detection often occur in practical applications, and the robustness of the algorithm needs to be improved; second, due to the need for every two adjacent macroblocks Performing spatial domain calculations and high computational overhead limit the application of this type of block effect detection algorithm in real-time video processing systems

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  • De-block effect method based on block effect detection
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  • De-block effect method based on block effect detection

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Embodiment Construction

[0033] like figure 1 As shown: the invention proposes a deblocking method based on blockiness detection. First, each frame of the input video image is re-blocked, so that the divided block B k Contains block boundary information in each frame of the original video sequence; then, for each re-blocked image block B in the current frame k Use the downsampling four-step method mentioned in the patent (application number: 200810148033.5) in the previous frame or the next frame to find the matching block B k_match .

[0034] Next, by comparing image block B in the current frame k Match block B with it k_match The pixel value characteristics in the image are used to detect whether there is block effect in the image block; finally, the smoothing function is used to perform adaptive smoothing based on the block effect intensity on the image block with block effect to remove the block effect. Below in conjunction with accompanying drawing and specific embodiment the present inventio...

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Abstract

The invention discloses a block effect removing method based on block effect detection. The method includes: using the information of a former frame and a post frame in the video sequence during upon block effect detection, which can accurately detect the block effect and effectively avoid false detection and leak detection; using a down-sampling four-step method to match the block search algorithm, greatly improving the search speed, and using the former frame and the post frame as reference frames which not only overcomes the 'shelter' and 'exposure' effect, but also makes the detected block effect to be more accurately by using inter-frame information; adopting block effect intensity self-adapting smoothing function to effectively remove the block effect. The invention only performing block effect removing process to the image content in which block effect exists in the video, thereby better maintaining the visual quality and peak signal-noise ratio PSNR of digital video.

Description

technical field [0001] The invention belongs to the field of video processing, and mainly relates to a method for deblocking effect based on block effect detection, which is suitable for digital video image processing, digital video image display and the like. Background technique [0002] In recent years, the application of digital video has shown a rapid development trend. It originated from the digital video transmission technology in the computer field. It also plays a very important role in research fields such as aerial reconnaissance, remote sensing, resource exploration and biomedical engineering. With the wide application of digital video, people have higher and higher requirements for video image quality, so digital video image processing has become the most important aspect of video technology research. Since various current video image processing algorithms, such as video denoising and frame rate enhancement, are all processing algorithms based on image macroblo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/24H04N19/105H04N19/172H04N19/176H04N19/36H04N19/533H04N19/55
Inventor 田逢春张鑫谭洪涛胡致远任晓羽龙红梅黄扬帆
Owner CHONGQING UNIV