Video coding method and device for suppressing intra-frame block respiratory effect in P/B frame

Abstract

The invention discloses a video coding method and device for suppressing an intra-frame block respiratory effect in a P / B frame, which relate to the technical field of video image coding. The video coding method comprises the following steps of: judging whether a coding mode of a current image unit is an intra-frame coding mode or not, performing respiratory effect pre-analysis on the image unit when the intra-frame coding mode is judged, performing inter-frame pre-coding on the image unit which can generate a respiratory effect, adjusting an inter-frame pre-coding quantization parameter according to corresponding respiratory effect intensity, and calculating an inter-frame pre-coding rate distortion cost, taking an inter-frame pre-coding result as a final coding result when the rate distortion cost is less than a set threshold, otherwise, replacing the original input image unit with the reconstructed image unit generated by the inter-frame pre-coding to perform final coding. Accordingto the video coding method provided by the invention, the respiratory effect generated by refreshing the intra-frame block in the P frame or the B frame can be solved, and the respiratory effect caused by discontinuous intra-frame prediction and inter-frame prediction modes can be effectively inhibited.

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 encoded 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 frame before the next I frame The loss of quality is relatively large, and the human eye will feel that the image in the surveillance video is periodically up and down, 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 movi...

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

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