利用图像识别的车速测量系统

介绍了一种基于CCD牌照识别的车速测量系统．该系统主要依据CCD抓拍同一车牌不同时刻的两幅图片，将它们的位置、大小及像素等信息送入车速计算模块，此模块充分应用图片中车牌大小变化、CCD成像系统的车牌与CCD空间位置间关系的几何特征，得出速度计算的实用公式，该车速讣算模块完全可以用软件实现，不依附额外硬件，误差在5％左右。

A Speed-Test System Using Image Recognition

Speed-test system based on plate recognition from CCD images is introduced in this paper. The essential principle in the system is as follows: From two pictures of the same vehicle, the movement speed could be derived by a calculation module. The module fully uses of the size change of the plate, the geometry between the plate and the CCD in the imaging system. The velocity can be calculated without any special hardware, and the error ratio of the recognition is about 5%.