opencv参考手册：OpenCV是Intel® 开源计算机视觉库。它由一系列 C 函数和少量 C++ 类构成，实现了图像处理和计算机视觉方面的很多通用算法。-Opencv reference manual is Intel® opencv: Open-source computer vision. It consists of a series of C++ classes and a small amount of function, the image processing