Ultra-long image group code rate control method and device

Abstract

The invention discloses an ultra-long image group code rate control method and device, and the method comprises the steps: firstly distributing the code rate of each frame in an ultra-long image groupaccording to the set frame structure of the ultra-long image group and the resolution of a current video image through a preset initial distribution principle; then acquiring a video image and exposure gain information and motion information corresponding to the video image, segmenting the video image by taking macro blocks with preset sizes as units, and counting the motion information corresponding to each macro block; adjusting the code rate of each frame in the super-long image group according to the exposure gain information and the motion information corresponding to each macro block; finally, calculating a residual code rate according to the code rate of each frame in the super-long image group, and dynamically adjusting the code rate of each frame in the super-long image group according to the residual code rate. According to the method and the device provided by the invention, the total code rate of the GOP image group can be kept within a certain range, the code rate fluctuation is reduced, and the picture quality of the video image can be ensured.

Description

technical field [0001] The invention belongs to the technical field of video coding, in particular to a method and device for controlling the code rate of an ultra-long group of pictures. Background technique [0002] Video surveillance is an important part of the security system. Video surveillance is widely used in many occasions because of its intuition, accuracy, timeliness and rich information content. In recent years, with the rapid development of computer, network, image processing and transmission technology, the popularization trend of video surveillance has become more and more obvious. Video surveillance has undergone tremendous changes in recent years. Digitalization and high-definition have made the image definition comprehensively improved. This has higher requirements for network bandwidth. Now the mainstream 1080P has gradually been replaced by 5M, 8M or even 12M The resolution is replaced, followed by the problem of bandwidth. Under the limited bandwidth, i...

AI Technical Summary

Problems solved by technology

However, in the design of the technical solution, since the ROI is a rectangular area, it cannot be controlled too strongly, otherwise the area of ​​interest and other areas will have a serious sense of layering

[0004] In addition, simple ROI control cannot greatly reduce the bit rate while ensuring a high-quality overall effect. In particular, when there are many moving objects, it cannot reduce the bit rate well while ensuring quality.

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