图形掩膜，提取感兴趣区,用预先制作的感兴趣区掩模与待处理图像相乘,得到感兴趣区图像,感兴趣区内图像值保持不变,而区外图像值都为0-Graphic mask, extracting regions of interest, ROIs with pre-made masks and images to be processed multiplied by the interest image, the region of interest image values ​ ​ rem