一种高精度图像采集系统的设计与特点

介绍了一种新型、高精度、实时伪彩色图像采集系统的原理、构成和特点。该系统采用１０ｂｉｔＡ／Ｄ转换器，使得高性能图像分析与处理成为可能。系统采样频率为１４．７５ＭＨｚ，对于标准ＰＡＬ制电视信号，可以保证采样后像素的横纵比为１∶１。由于采用最新ＥＰＬＤ编程技术，使得系统体积减小，可靠性显著提高。可输出标准ＰＡＬ制黑白全电视信号、ＲＧＢ分量彩色信号、Ｙ／Ｃ分量彩色信号及复合视频信号。该系统通过标准ＩＳＡ总线与计算机接口，帧存直接映射计算机内存地址空间，存取速度快。本系统特别适合于高精度的图像测量应用

The Design and Features of a New Type of High Precision Image Acquisition System

The principle, construction and features of a new type of high precision, real time, pseudo color image acquisition system is described. This system employs a 10bit A/D converter, which makes high performance image analysis and processing to be possible. The sample frequency is up to 14.75MHz, which can provide square pixels when the video source is a standard PAL. Because the new EPLD technology is applied, the system has small size and high reliability. The output can be configured as black and white video, RGB video, Y/C video (S Video) or a composite color video signal. The system has an interface to the computer via the standard ISA bus. The frame memory in the system is directly mapped to the computer′s memory address space. High speed memory read and write can be realized. Such a system is most suitable for the applications of high precision image measurement.