说明：  提出一种基于改进Sobel算子的车牌定位算法，首先对已经通过预处理的车牌图像使用改进的Sobel算子进行运算，然后使用迭代求图像最佳分割阂值的算法二值化车牌图像最后结合水平投影和垂直投影算法对候选区域分析锁定车牌位置。
(Proposed based on improved Sobel operator license plate location algorithm, first pre-processing of the license plate image has adopted the use of the improved Sobel operator to conduct operations, and then demand the use of iterative thresholds the image segmentation algorithm for optimal binarization car At last, the level of brand image projection and vertical projection algorithm to the analysis of the candidate region locking plate position.)