This experiment uses the methods of median filter transform threshold and tessellate to preprocess the image to stand out the characters of it . Then pick-up the pixel of unique point according to the program edited by myself .

本实验采用中值滤波对图像进行预处理，然后进行阈值变换、 细化 使图像特征 点突出，通过自己编写的程序提取特征点象素 坐标 值。