Research On Technique For Acquisition And Processing Of Videoconferencing Image

The videoconferencing makes use of multimedia communication networks and multimedia terminals, and lets participants who are at different place discuss the identical subject. The participants not only can hear speaker's voices, but also can see speaker's image and background, meanwhile can exchange related information such as data, text and diagram etc. It involves inevitably many related questions of acquisition and processing of video image, like video image capture, compression and encoding, encryption, watermark-inserting as well as interconversion of video image format etc. So the thesis researches and introduces the technique for acquisition and processing of videoconferencing image based on the application background of videoconferencing system deeply, it has positive significance in the science and technology research and the project application.Firstly, the main method, the feasible plan as well as the hardware equipment for acquisition of videoconferencing image are introduced in detail, and then the thesis determines the plan for acquisition of videoconferencing image.Secondly, two kind of video image processing techniques are researched deeply: the interconversion of video image format and the compression and encoding of video image, and then the thesis does simulation experiment for the interconversion of video image format and the compression and encoding of video image by taking the Visual C++6.0 platform and the PC as tool. In the part of the interconversion of video image format, the interconversion between RGB(24-bit color) and YUV(4:2:0) is realized; In the part of the compression and encoding of video image, the Huffman encoding of lossless compression and the DCT of lossy compression are realized.Lastly, the H.264 encoder is designed and implemented based on the H.264 reference verification model(JM10.1) by taking the PC as hardware environment and taking the Visual C++6.0 as development tool. Under the IDE of Visual C++6.0, we make processing of compression and encoding to different video sequences, and then make analysis to results of compression and encoding, it proves fully the high performance of encoder.