A KVM video content change detection method based on compressed domain
A technology of video content and change detection, which is applied in the direction of TV, color TV, color TV parts, etc., can solve the problems of inability to detect changes in KVM video content, increase the amount of calculation, and high computational complexity
Active Publication Date: 2021-04-09
ZHEJIANG UNIV OF TECH
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[0005] The above method is mainly to detect changes in video content in the pixel domain, and the overall computational complexity is relatively high. In addition, for KVM video, decoding and reconstruction in the pixel domain is required, which further increases the amount of calculation, so it is not suitable for KVM video content. change detection
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[0029] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto. The video decoder used in this embodiment is FFmpeg, and the version number is 3.2.4; the input video source is the video recorded by the KVM switcher from the VGA port, the resolution is 1080P, the recorded target code rate is 4Mbps, and the frame rate is 30fps , the encoding prediction structure is IPPP mode, and the I frame interval is 150; the recorded KVM video content includes scenes such as mouse movement, pop-up windows, inputting Chinese characters, sliding word documents, and rapid and large changes in the overall desktop. like figure 1 Shown, a kind of KVM video content change detection method based on compressed domain, comprises the following steps:
[0030] (1) Input the KVM video code stream of an image group;
[0031] (2) Analyzing the video code stream to obtain the compressed domain c...
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The present invention relates to a KVM video content change detection method based on a compressed domain, comprising the following steps: (1) inputting a KVM video code stream of an image group; (2) analyzing the video code stream to obtain a P frame compressed domain coding information; (3) Macroblock bit number filtering; (4) Use multi-level encoding information to judge whether the content of the current frame has changed; (5) Save or discard the image group according to the content change flag. The present invention makes full use of the coding information generated in the video coding process, without rebuilding the image, and can effectively detect the change of the KVM video content in units of image groups, which greatly reduces the computational complexity compared with the processing method in the complete pixel domain, and at the same time It also effectively reduces the storage amount of KVM video.
Description
technical field [0001] The invention relates to the field of digital video processing, in particular to a compression domain-based KVM video content change detection method. Background technique [0002] Keyboard (Keyboard), monitor (Video) and mouse (Mouse) remote switching management system, that is, KVM system, also known as multi-computer control system, is mainly used for remote control of various computers in the computer room. KVM video is the data collected and compressed from the original video output by computer screen in the digital KVM system. It brings great inconvenience to storage and management. In order to reduce the storage capacity of KVM video and facilitate management, the change detection of KVM video content is very important. There are many redundant parts without content changes in KVM video. By detecting content changes, only the parts with video content changes can be stored, and the redundant parts with no change in video content can be discarde...
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IPC IPC(8): H04N5/14
Inventor 朱威荣意朱浩琪吴远何德峰郑雅羽
Owner ZHEJIANG UNIV OF TECH