Position:Current, video monitoring already was being installed prevent the wide application in the domain, but existence monitors in real time and image is answered put unsharpness appearance, bring about right identifying, obtain evidence, incident analysis causes difficulty. The article is compressed with respect to image of function of camera function, video wire cable, video and show equipment 4 much make an analysis, the integral system that puts forward to enhance video image definition devises an idea, in order to offer reference.
TV supervisory system has gained ground very much in our country, included bank, legionary, government, enterprise to had installed many camera. But according to preliminary understanding, the existence of TV supervisory system of great majority monitors in real time and answer put the issue with unsharpness image, bring about right identifying thereby, obtain evidence, incident analysis causes difficulty, make a suspect facial even the feature cannot identify.
The article analyses the foundation of technology and technology of processing of video information number to go up in frequency domain, image of function of the camera function to affecting definition, video wire cable, video is compressed and show 4 much to make an analysis, the integral system that puts forward to enhance video image definition devises an idea, in order to enhance the image definition of existing TV supervisory system, use instrument of quality of VQT-3000 video picture and market finally to be sent on a diplomatic mission the test result of definition of two kinds of commonly used camera, in order to offer reference.
Introductive
As the flying development of Chinese economy, each are big the city has been built have many TV supervisory system. But although installed numerous monitoring camera, the image after happening of details of a case is answered put put in the problem with unsharpness image, especially the suspect is facial the feature is unsharpness, identify hard, of the crack a criminal case that this gives the Ministry of Public Security the door, court obtained evidence to bring huge to bother. This project analyses the foundation of technology and technology of processing of video information number to go up in frequency domain namely, the key solves the problem that image clarity turns.
Cost very big fund to install TV supervisory system when us, the image that cannot get clarity however (specific graph requesting an audience 1, 2, 3) , this brings very big question to real work:
1, cannot differentiate spot detail;
2, cannot identify guilty suspect is facial feature;
3, cannot become the spot to obtain evidence data.
Quality of picture of video supervisory system is analysed
Analyse seriously according to us, image of influence video supervisory system shows the main factor of quality has:
1, camera lens;
2, camera;
3, video BNC connect;
4, video cable is transmitted;
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