p参数法对车牌号上的数字进行提取。里面附带一张图像，检验是可行的。-p parameter method to extract the numbers on the license plate number. Which comes with an image, the test is feasible.

用于提取并识别出车牌号，可以区分数字和字母(Used to extract and identify the number of the license plate, which can distinguish between numbers and letters)