www.gusucode.com > images 案例代码 matlab源码程序 > images/CalculateGradientMagnitudeAndGradientDirectionExample.m

    %% Calculate Gradient Magnitude and Gradient Direction
% 
%%
% Read image into workspace.
I = imread('coins.png');
%%
% Calculate gradients and display.
[Gmag, Gdir] = imgradient(I,'prewitt');

figure; imshowpair(Gmag, Gdir, 'montage');
title('Gradient Magnitude, Gmag (left), and Gradient Direction, Gdir (right), using Prewitt method')
axis off;