车牌水平矫正中radon变换的应用，注意radon变换检测直线方向有几种，有基于投影最大值的，有基于车牌字符空隙的等。-The level of radon transform plate correction application, pay attention to radon transform to detect straight line there are several, with the maximum value based on the projection, there are gaps in the other characters on license plates.