用openCV编写的角点检测程序，其中第一个角点检测是从一缓冲区读入到图像，转换成IplImage后检测出角点；第二个角点检测函数是检测两副图像的角点，以便于进行匹配等运算操作。-used to prepare the corner detection procedures, the first one corner detection is a buffer to read images into IplImage after detect corner; the second corner