The KeJian Inquisitional System Based On MPEG-4 Protocol

In today's legal society, the diaphaneity of the course that inquisitorinquires suspect becomes more and more deep. In order to ensure the legal rightof inquiring and suspect as best as we can, the inquisitional systems of videoare widely used in the inquisitional course of the law executed departments allover the world.The Currently inquisitional systems of video in our nation mostly adopttranscribing video of the inquired room and use traditional video formats suchas MPEG-1, MPEG-2, AVI, JPEG, H.261. Though these systems can achievethe base task of inquisitional systems, the effect of kinescope is lower as wedesire on definition and compressibility. For inquisitional systems of video, thequality of kinescope is large and the quality desire is high. These current systems' video files can't manage conveniently. Thereby, adopting advancedtechnology to improve video files' effect on definition and compressibility isinquisitional system of video's developing trend.Along with the advancement of the science and technology, the more andmore new technology is widely used in inquisitional system of video andgreatly improves the system's quality and efficiency. MPEG-4 protocolstandard is the more important one of these new technology. The capability ofthe video and audio kinescope based on MPEG-4 is higher than the traditionalvideo format from quality to compressional effect. So inquisitional system ofvideo based on MPEG-4 protocol emerge as the times require and the KeJianinquisitional system is one of these.MPEG-4 is a sort of picture compressible code standard, it integratemultitudinous multimedia application into a integrated framework in order toprovide standard arithmetic and tools for multimedia communication andapplication condition. It is used to realizing avail code and universal accessaudio and video data. In order to realize based on content alternationMPEG-4's first work is dividing video/picture into different objects orseparating the moving objects from background, then it adopts correspondcoding method for different objects to realize high compression. The MPEG-4sufficiently makes use of human vision characteristic, catch hold of the essenceof picture information transmission, through the thought of figure and venation,hold out based on vision content's alternation function. It adapts multimediainformation's application from playing model to the development's trendvisiting and searching based on content. Compared with current other audio andvideo standard, the MPEG-4 standard has some characteristic the highcompression rate, saving memory space, better picture quality. The MPEG-4format video's picture quality is as same as the DVD.The hikvision's video condensable card named DS-4004H, is one of theaudio and video compressing cards which are based on MPEG-4 protocolstandard. It complete depend on hardware to realize video and audio real-timecoding and synchronization, realizes dynamic code rate, controllable frame rate,choice of frame type, dynamic picture's quality control, audio preview, and alsocan independently adjust every channel's parameters, therefore the capability isstable and credible .The KeJian inquisitional system that is introduced in this text usedDS-4004H video condensable card which is based on MPEG-4 protocol ,realized the necessary function of the inquisitional system such as audio andvideo supervise , kinescope. In this foundation, according actual requirementthis system add many correlative functional module, such as the textcommunication and command subsystem, the hardware device controlsubsystem, the informational managing subsystem. From integration of theseoriginal independent module and new management module, KeJianinquisitional system greatly improve the users work efficiency.At the base of technology introduce of the KeJian inquisitional system, inthis text we give the system's design module of theory and fact. According tothe system's module, we adopt c/s net structure, divide this system to client andserver, give detailed design and layout the server and client's function. By theway , we give the mainly functions using class chart.After obtaining the class graphs from the system design, we give thefunction's code of these classes using c++ language and the important module'sflow chart.As a new inquisitional system of video, the KeJian inquisitional system notonly satisfies the inquisitional system base requirement but also add a great dealof additional function which gives greatly convenient for using to users andimprove the system's efficiency. The system's correlative work satisfies currentrequirement, at the same time it establishes base for inquisitional system'sdevelopment later.