基于OpenCV的视频放大，vfw获取相机图像，进行背景积分平均后放大显示-Based on OpenCV enlarge video, vfw access to camera images, after background integral average zoom

int GetImage(int number, unsigned char** buffer, unsigned long* psize, IMAGE_RESOLUTION resolution, float zoom, int dx, int dy) Returns camera image in jpeg format. Note that for zoom = 1 the returned image size is determined by the values of c