【摘要】 不均匀光照下的图像二值化是数字图像处理中的一个难题,汽车牌照自动识别系统工作在复杂的光照环境下,经常会出现车牌光照不均的现象,给图像二值化带来困难.为此,提出一种解决办法,首先使用同态滤波去掉车牌图像的不均匀光照的影响,然后使用改进的Bernsen算法对车牌图像进行二值化.实验表明,使用该算法能有效地克服不均匀光照的影响,二值化效果良好,车牌识别率得到显著的提高.更多还原

【Abstract】 It is a difficult task to binarize image under nonuniform illumination; and this problem is always met in license plate recognition system which must work under complex illumination. A new method is presented as follows:at first, it enhances the plate image quality by homomorphic filtering to eliminate the bad effect of the nonuniform illumination;then,binarizes the plate image by a improved Bernsen algorithm.Experimental results show that this algorithm is robust in dealing with nonuniform illuminated, degraded license plates. With the proposed method, the recognition rate of the system can be improved notedly.更多还原