Mat srcImage = imread("D:\\photo\\花.png");
int deapth = srcImage.channels(); / /通道数，channels是函数，注意括号
int width = srcImage.rows; / /宽
int height = srcImage.cols; / /长
获取图像的长、宽、通道数
原文：https://www.cnblogs.com/YAO-a-YAO/p/11635626.html
