说明：  他的意思是在当前路径里把文件名为“凝视.jpg”的图片数据读取到A中保存，那我们可以看到在图片最右边Workspace区域放着一些数据，这就是A的数据，我们看到这张图片是340*593*3大小，意思是340行，593列，3通道（RGB）的图片，右边的UINT8表示8位无符号的整型类型。
(He means to read the image data named "gaze. JPG" in the current path and save it in A. then we can see that some data is placed in the workspace area on the far right of the image. This is the data of A. We can see that this image is 340 * 593 * 3 in size, which means 340 lines, 593 columns and 3 channels (RGB). Uint8 on the right represents 8-bit unsigned integer type.)