HEVC (High Efficiency Video Coding) compressed video quality improvement method used in combination with QP (Quality Platform) detection

Abstract

The invention discloses an HEVC compressed video quality improvement method used in combination with QP detection. The method mainly comprises the step of detecting QP of a decoded video frame, and selecting a corresponding network model according to a detection result to improve the quality of the video frame. According to the invention, a space-time network structure is adopted for a video post-processing model, an improved U-Net layered network structure is adopted in space, and by reducing the size of feature mapping, a data volume is reduced and the size of a compression effect is reduced; in addition, multi-scale space prior information of the video frame is extracted by combining a plurality of different convolution kernels; and in terms of time, due to correlation and quality fluctuation characteristics between video frames, motion flow graph information between a target frame and a plurality of adjacent frames is extracted, so missing detail information of the target frame can be made up, and high-frequency details of the target frame are recovered in combination with an enhanced I frame. Experimental results show that the method can effectively suppress the compression effect of the video, improve video quality and obtain a better visual effect.

Description

technical field [0001] The invention relates to QP detection and compressed video quality improvement technology, in particular to a method for improving HEVC compressed video quality combined with QP detection, belonging to the field of image communication. Background technique [0002] The video coding standard HEVC has become more and more widely used on the Internet to generate video streams. Like previous video coding standards, HEVC compressed video will also produce compression effects, such as blocking effects, ringing effects, blurring, etc. The existence of these compression effects seriously affects the user experience. In order to weaken the impact of the compression effect, HEVC adopts the loop filter technology, including two loop post-processing modules, the deblocking filter DF and the sample point adaptive compensation SAO, which can restore the subjective and objective quality of the damaged video, and also help to improve Compression efficiency. Although...

AI Technical Summary

Problems solved by technology

However, since the quantization parameter QP of the actual compressed video may be unknown, in this case, practical video decompression methods are also required

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