一个高速图象数据采集系统

A High Speed Image Data Acquisition System

介绍视频图象印相机中所采用的高速图象数据采集系统。该系统用来完成图象信号的视频处理，高速数据采集，并将采集到的高速图象数据流存入图象存贮阵列。系统主要由梳状滤波器、视频放大、同步分离、模数变换、图象存贮器以及有关的微机控制部分组成。文中着重讨论了快速Ａ／Ｄ变换，采用象素缓冲技术的快速存贮以及整个系统的同步和控制等关键技术。实验结果表明，系统能达到上述每点采集时间的要求，对于图片的６４０×６０８空间分辨率要求，一幅图象的采集时间约为３１．５ｍｓ。

A high speed image data acquisition system used in the video graphic copier is introduced.The system is used to perform necessary processing of the video signal,high speed data acquisition,and to store the image data acquired into the image memory. The system mainly consists of a comb filter,a synchronous seperator,a flash A/D converter,the image memory and some concerned synchronous control components of the microcomputer.This system is possessed of obvious features of high speed analog-to-digital conversion and image storage.The pixel time is only sins. The analog-to-digital coversion,pixel buffering technique and system synchronization are discussed emphatically. Finally, experimental results show that the requirements mentioned above for the pixel time can be satisfied in the system,and the acquisition time of an entire picture frame is about 31.5ms when the spatial resolution is 640×608.