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Video surveillance as an important means of security has been a long history of development . Now , digital video surveillance has become a key development areas of video surveillance , and its products is toward systematic , network-based, high-definition , intelligent direction . This real-time video image acquisition , image the quality and the amount of data , as well as the transmission of convenience , etc. , give us a higher demand and more demand . The traditional computer peripheral interface there are many shortcomings , or inconvenient to use , poor anti-interference ability , either the data transmission speed is too slow , has been unable to meet the needs of the modern computer . Universal Serial Bus USB, a series of advantages due to the fast, flexible and easy to use , easy to expand , plug-and-play support , low cost , thereby obtaining a wide range of applications . The proposed external video capture box with USB interface , use the the WIS latest digital audio and video compression chip GO7007SBUABX01 multi - video compression format ( MPEG-4/MPEG-2/MPEG-1 ) , high - definition large-size screen capture, editing and processing . In this paper, the characteristics of the Universal Serial Bus (USB) , bus specification and protocol is described in detail . Detailed description of the USB bus - based video image compression and transmission systems throughout the development process . Comprising: a video decoding , video capture , and a digital video image compression and USB interface . Also describes the design principles and methods of the various parts of the circuit . Final test results show that the proposed analysis and design method is effective and feasible.
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