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Study on the Technology of Video and Pictures in Software-based Videoconference System

Author: XueHongWei
Tutor: HanHuiLian
School: University of North
Course: Communication and Information System
Keywords: Video conferencing software H.264/AVC Video image acquisition Zoom Interpolation Selective enhancement Hybrid coding RTP / RTCP Video Encryption
CLC: TN948.63
Type: Master's thesis
Year: 2009
Downloads: 113
Quote: 0
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Abstract


Software-based video conferencing system video conferencing is the future trend of development, and the future development of the primary video conferencing technology is more advanced video codec technology and a more professional image processing front-end technology? In this paper, the most influential video compression coding standard H.264/AVC, the software in the video conference video image technologies related research aspects: Firstly, to achieve a video conference video image data collection, including cameras capture video data stream and the desktop windows image acquisition; while optimizing fast from RGB to YCbCr format conversion program? advantages and disadvantages of co-ordinating the traditional interpolation algorithm based on the proposed hybrid model based on block interpolation algorithm optimization, optimization algorithm gives precise threshold calibration method; applications for the desktop image scaling, experimental results of the different sizes of block algorithms consuming way between; subsequently applied to the optimization algorithm in H.264, focusing on analysis of different threshold selection on image quality effect, experiments show that, in a video conference applications, compared to traditional algorithms, optimization algorithms can be interpolated amplified video quality generally improved 1 ~ 2B above; paper also carried the universal applicability of optimization experiments demonstrated? image for video Chinese unclear status of the content presented on Niblack Chinese color image enhancement algorithms selectivity of this content? Firstly, RGB primary colors on the color image based on the text of a preliminary determination; Then using the threshold range of options to further define the text content while filtering background noise; Finally, according to the brightness of the pixel itself, to enhance the strength of adaptive selection? Experiments show, the algorithm achieved a certain desired effect? ??IDR picture using the H.264 standard immediate refresh feature, proposed and designed to achieve a multi- mixed-resolution image sequence coding scheme? using this coding scheme, when the video source image resolution is changed, without restarting the entire system to ensure the continuity of operation of the system? addition, the paper RTP / RTCP Real-time Transport Protocol and post-processing error concealment techniques were analyzed through the channel simulation illustrates the importance of the overall design of the system? video conference papers also carried out a preliminary study encryption methods, programming two adapted H.264 video conferencing system Simple encryption?

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > TV > TV and television equipment > Television Center Management System > Video conferencing systems
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