Video coding method and device for suppressing breathing effect

Abstract

The invention discloses a video encoding method and device for suppressing breathing effect, and relates to the technical field of video image encoding. A video encoding method for suppressing breathing effect, comprising the steps of: performing pre-analysis of breathing effect on an input image, obtaining the intensity of breathing effect produced by each coding unit in the image; performing inter-frame precoding on image units that can generate breathing effect, and When precoding the image unit, adjust the quantization parameters of the inter-frame precoding according to the result of the aforementioned breathing effect pre-analysis; replace the original input image unit with the reconstructed image unit generated by the inter-frame pre-coding for final encoding. The video encoding method provided by the present invention can be used to solve the breathing effect caused by I-frame and I-frame refreshing, and can effectively suppress the breathing effect caused by the discontinuity of intra-frame prediction and inter-frame prediction modes.

Description

technical field [0001] The invention relates to the technical field of video image coding. Background technique [0002] In surveillance video coding, in order to reduce the distortion caused by inter-frame predictive coding and the spread of mosaics caused by code stream transmission errors, and to support random playback at the decoder, it is necessary to insert I frames into the coded stream for refresh. When the video coding works at a low bit rate, the coded image quality of the generally inserted I frame is relatively good for the reference of the subsequent P frame or B frame, and as the transmission of the inter-frame prediction error expands, the P The loss of frame quality is relatively large, and the human eye will feel that the monitoring video has periodic ups and downs, that is, the breathing effect. This breathing effect is subjectively more obvious in the static area of ​​the image, but not easy to feel in the moving area. Since a large number of scenes and...

AI Technical Summary

Problems solved by technology

Although the above encoding scheme can alleviate the breathing effect, the mandatory first round of P slice encoding will lose the clarity of the input image and affect the compression efficiency of subsequent inter-frame predictive encoding frames.

In particular, it is necessary to maintain good coding quality for moving people and objects in the surveillance video, and the adoption of the above technical solutions will significantly affect the compression rate and subjective quality of the surveillance video

In addition, the computational complexity of the complete two-round encoding is very high, which has a great impact on the performance of the encoder

Images