| Video detection has an important role in transmission and broadcast of CATV signal. A video detection system based on video compression , image identification and MCU technology is developed to monitor the image and speech, and to give automatically warning to video fault of multicenter CATV or AV.Firstly, a brief introduction is gived about the structure and principle of video compression card. Main features of intraframe prediction and motion estimate of the H.264 standard are also analyzed. After this, the algorithms of image identification are detailedly researched such as pretreatment, threshold value segmentation, edge detection and feature extraction. Secondly, the multi-channel video detection system are designed and the software is programmed in Visual C++ platform, using the software many kinds of video errors are successfully recognized. Lastly, a MCS51 MCU circuit is developed for preventing illegal video signal, and the result of a series of experiments shows that it has superior sensitivity and accuracy. |
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