中文摘要：

基于透射式液晶的电光特性，设计和开发了一套基于液晶和数字处理器（digitalsignalprocesso~DSP）的强光局部选通智能网络摄像机系统．系统基于透射式液晶和DSP开发板（核心芯片TMS320DM642）技术，利用DSP控制液晶驱动，实现液晶单个像素透过率的控制，将强光的透过率下降2个数量级；该系统利用另一块DSP开发板（核心芯片TMs320DM6437）实现将处理后的强光视频信号进行网络传输与实时存储到PC机中，实现选通智能网络摄像．该系统24h所需存储硬盘容量8．648Gbit，所用液晶的延迟时间25．5ms，电路延迟时间17¨s．在光强大于2．2×10’lx的强光照射下，得到系统的选通视频实验结果．结果表明该系统能解决强光下普通CCD高动态范围摄像机出现局部曝光过度而不能分辨细节的成像问题，实现了CCD的高动态范围成像．

英文摘要：

Based on the electro-optical characteristics of the transmission-type liquid crystal （LC） and DSP （Digital Signal Processor, chip TMS320DM642） technology, a smart network camera system for partial gating strong light intensity is developed. An LC display driver is controlled by DSP to achieve light intensity transmittance of every single pixel in this system; the light intensity transmittance can be decreased by two orders of magnitude. In addition, the smart camera of video signal processed under a strong light can be transmitted through network transmission and real-time storage to PC by another DSP （chip TMS320DM6437）. Thus the LC delay time is about 25.5 ms and the system circuit delay time is about 17 Its, while the storage hard disk capacity requires 8.648 Gbit in 24 h. Experimental images are taken by the prototype to shoot the simulated license plate illuminated by the strong light （greater than 2.2 x 105 lx）. Results show that the imaging problems, viz the ordinary CCD camera may give partially overexposed images and cannot distinguish details under the strong light, are all solved and achieved a high dynamic range imaging by the prototype.