说明：  单幅图像的平均梯度值计算 MATLAB源程序 【更新】2009-04-15 15:59说明：该程序的作用是计算输入图像img的平均梯度值AVEGRAD 平均梯度值可以衡量图像细节反差表达的能力，是图形融合结果的一个评价算子之一
(Single image, the average gradient value MATLAB source code [update] 2009-04-15 15:59 Description: The role of the program is to calculate the average gradient of the input image img to the value of the average gradient value can be measured AVEGRAD image detail contrast presentation skills, and is a graphic fusion of operator evaluation)