为了提高非接触式测量的精度与实时性, 以FPGA为基础提出了一种基于CMOS图像传感器的实时二维相关测速法。介绍了二维相关测速的原理和实现方法, 推导出该方法的二维测速范围和测速精度。所采用的CMOS图像传感器具有1 280×1 024像素的分辨率,测量精度可达1个像素, 并在此基础上采用求重心法进行8细分将测量精度提高到1/8像素。利用FPGA将传统的数学运算转换为逻辑运算提高了运算速度和可靠性, 实现了实时性测量。通过实验验证了该方法的可行性。

In order to improve the accuracy and real-time performance of the non-contact measurement, a real-time two-dimensional correlation speed measurement was proposed on image processing using high speed CMOS based on FPGA. The principle and practical work method of the measurement were analyzed, the range and accuracy of this two-dimensional correlation speed measurement were deduced .The resolving power of the CMOS image sensor is one pixel, and it can be improved to 1/8 pixel by Subdivision Technology. The mathematical operation is converted to logical operation through FPGA .Finally,a preliminary test result is presented.