读取指定帧并灰度化并canny边缘提取及灰度直方图及RGB值，借用OPENCV-Reads the specified frame and the graying and the canny edge detection and histogram and RGB value, using OPENCV

读取图片，提取rgb信息，做三种方式实现边缘检测，并输出图像-Read the image, extracting information rgb, three ways to do edge detection, and outputs an image