中文说明：
实现简单的梯度算法，这是一个函数文件。调用函数的主程序文件以及实验用的lena图都一并上传了，使用简单，快捷。注：该程序可以直接处理彩色图像。
English Description：
Implement a simple gradient algorithm, which is a function file.The function of the main program files and Lena figure used in the experiment were posted, along with all the use simple and quick.Note: this procedure can be directly dealing with color images.