有线电视视频图像故障监测系统设计开发

【作者】 郭军；

【导师】 吴亚锋；

【作者基本信息】 西北工业大学 ， 信号与信息处理， 2006， 硕士

【摘要】 有线电视视频监测系统对控制、提高有线电视系统的传播、播出质量,保证良好的收视效果有着重要的作用。本文利用视频压缩、数字图像识别理论和单片机技术,设计开发了一有线电视视频监测系统,该系统可同时监测多路CATV或AV电视节目的图像和伴音信号,实现了对图像、声音、非法信号入侵等故障的自动报警功能。 首先介绍了视音频压缩卡的工作原理和结构组成,分析了H.264标准的帧内预测、运动估计等算法的主要特点;讨论了数字图像识别的原理过程,对图像预处理、阈值分割、边缘检测、特征提取等算法做了详尽论述。其次,在Visual C++开发平台上,完成了多通道有线电视视频监测软件的系统框架和功能模块的设计。针对电视信号出现的视频图像故障现象设计了相应的检测算法,并将其用程序加以实现;应用本监测软件实时地进行了大量的监测测试,成功地实现了多种视频图像故障的监测和报警。最后,针对有线电视前端非法信号的入侵问题,设计了一种基于MCS51单片机的检测卡,详述了其检测原理和电路构成,多次测试结果表明该板卡有较高的检测灵敏度和准确率。更多还原

【Abstract】 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.更多还原