摘要
为实现计算机视频泄漏信号的实时采集,设计了以DSP为核心、USB2.0为传输通道的泄漏信息采集系统。重点描述了高精度同步信号发生器的软、硬件实现方法和泄漏信号的实时传输方案,主机由采集到的数据提取泄漏视频的行、场同步参数,并通过USB接口传给DSP。提出一种抖动细调校正方法,DSP在接收到的同步参数基础上由细调算法对同步信号进行实时调整,产生精度可达7ps的视频信息同步信号;提出了一种以场为单位分块传输的实时视频图像传输方案,同步信号参数在视频图像的场消隐期间进行传输,实现了视频、参数的双向传输。实验采集了行周期为15.625kHz、场频为50Hz的CCD视频信号和行周期为48.656kHz、场频为60Hz的计算机视频泄漏信号,截获图像显示稳定,证明本系统方案切实可行。
A system for computer video leaking information capture is designed, which employs DSP as the kernel and USB2.0 as data transfer channel. High precision synchronization generator is realized and the system runs real - time. The host computer extracts the line and field synchronization parameters from the captured data, which are transferred to DSP via USB channel. Synchronization signals are adjusted dynamicly based on the parameters. DSP generates high precision synchronization of 7ps and achieves steady capture and display. A real - time video image transmission scheme is also presented, which is based on bulk transmission with one field image as a unit. Successful acquisition and display of stochastic video signals with a line - period of 15. 625 kHz and field - frequency of 50Hz and the video leaking signals of computer display with a line - period of 31. 656 kHz and field - frequency of 60Hz respectively demonstrate that this plan is feasible.
出处
《计算机仿真》
CSCD
2007年第8期205-208,共4页
Computer Simulation
基金
国家"863"技术项目(2002AA783050)
