Gradient information serves several purposes. It can relate the structure of objects in an image, identify features of interest for recognition/classification directly or provide the basis of further processing for various computer vision

matlab灰度图像的边缘提取：直方图均衡化，canny算子实现一阶偏微分，计算梯度幅值和方向-matlab Gray Image Edge Extraction: histogram equalization, canny realization of first-order partial differential operator, calculate the gradient magnitude and direction

this gradient magnitude code in matlab-this is gradient magnitude code in matlab