主要是完成真彩色图像的轮廓提取，包含将两幅图像进行差影，继而采用canny算子进行轮廓提取，包含了好几方面的知识，有彩色图像转换为灰度，差影法，canny算子轮廓提取-Notably the completion of true color image of the contour extraction, contains the difference between two video images, and then using canny operator for contour extr