摘要
以DSP芯片TMS320F206和USB接口芯片CY7C68013为核心,结合可编程逻辑器件CPLD,设计了基于USB2.0总线的非标准视频图像采集系统。该系统能自动分析被采集信号行、场同步特性,通过对采集图像的纹理特性进行分析,自动调整同步信号发生器的参数,逐步减小同步偏差,最终获得与实际信号时序一致的同步信号。实验结果表明,系统产生同步信号的时间短、精度高、适应范围宽,采集的图像没有扭曲变形,连续显示无滞后现象。
An intelligent nonstandard video image acquisition system based on USB2. 0 was designed. It consisted of DSP chip TMS320F206, USB interface chip CY7C68013, complex programmable logic device （CPLD） and an automatic algorithm to extract synchronous signal of nonstandard video image. The algorithm extracted tilt angle, phase difference and other features of the acquired images to recognize the direction of the synchronizing deviation. Then, the deviation was used to adjust synchronizer＇ s parameter and reduced the synchronizing deviation gradually. Finally the synchronous signal which was identical to the actual signal was obtained. The experiment results showed that the system could produce accurate synchronous signal in very short time, and it showed the ability of real-time transmission and display images with no distortion.
出处
《电子器件》
CAS
2008年第3期817-819,823,共4页
Chinese Journal of Electron Devices
