改代码提供了raw格式图像的读取和写入的基本方法，实现了常见梯度算子的处理结果。是数字图像相关专业初学者很好的一个基础，希望对你们有所帮助！-Change the code to provide a raw format image read and write methods to achieve the outcome of the common gradient operator. Digital images specialized beginners a good foundation