Video encoding and decoding method and device thereof

Abstract

The invention relates to the field of video compression, and discloses a video encoding / decoding method and device. The encoding method comprises the following steps: acquiring a background image, using intra-frame prediction to encode the background image to obtain a background frame, decoding the background to obtain a background frame reconstructed image; acquiring an input image as the first image, at least locally adopting the intra-frame prediction to encode the first image as a refresh frame according to the difference of the first image with respect to the background frame reconstructed image; acquiring the input image as the second image, at least locally adopting the intra-frame prediction to encode the second image as a normal frame according to the difference of the second image with respect to the background frame reconstructed image and the adjacent former frame reconstructed image, or the difference of the second image with respect to the adjacent former frame reconstructed image; and generating a video bitstream according to the background, frame, the refresh frame and the normal frame. According to the difference of the input image with respect to the background frame reconstructed image and / or the adjacent former frame reconstructed image, the intra-frame prediction is at least locally used for encoding, and the same image quality can be obtained through the adoption of lower code rate for the scene with a large number of redundancy background information.

Description

technical field [0001] The invention relates to the field of video compression, in particular to a video encoding and decoding method and device thereof. Background technique [0002] With the development of society, video surveillance systems are more and more widely used in life to solve the growing security needs. But at the same time, high-quality video data requires a large amount of storage resources, so video compression technology has been continuously developed to save storage costs. However, none of the existing video compression standards is formulated for monitoring scenes, and its compression technology still has large information redundancy for video surveillance, which is mostly static. Therefore, the present invention provides an encoding method, which can obtain the same image quality at a lower bit rate for monitoring scenarios, thereby reducing the cost of video storage. [0003] In a video coding system, an encoder can use a variety of different coding ...

AI Technical Summary

Problems solved by technology

[0005] The inventors of the present invention found that most of the video surveillance systems are static scenes. In the existing method, a large amount of background redundant information is encoded every time I frame is encoded, and there is still room for further improvement in the compression efficiency of the surveillance video.

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