从摄像头提取视频文件，并显示每个图像帧的灰度直方图与一维RGB彩色直方图，并且比较上述直方图的距离。有四种比较方法一一实现了。-Extract the video file from the camera and display each image frame of gray-scale histogram and the one-dimensional RGB color histogram, and compare the histogram distance. There are fou