IplImage结构体及相关知识；理解IplImage结构体的一些重要成员；颜色3通道的理解，RGB颜色空间的理解，ROI区域的理解等知识。如果通过指针访问图像数据，与图像相关的一些基础知识-IplImage structure and knowledge　understanding the IplImage some important members of the structure　knowledge of color 3 channel understanding, the understanding of the RGB color space, and the understanding of ROI region. If the pointer to access the image data, and image related to some of the basics