通过计算图像的面积和周长，可以与所存图像对比，从而识别出图像所代表的含义。如，输入一个字母A的图像，通过比较，识别出是字母A。-By calculating the area and perimeter of the image, and the image contrast, we can identify the meaning of image. Such as, enter a image like letter A, you can identify the letter A by c