程序结果图
但是保存下来梯度图竟然变成了这样
请问是怎么回事,我程序代码是:
I = imread('1灰度图.jpg');
hy = fspecial('sobel');
hx = hy';
Iy = imfilter(double(I), hy, 'replicate');
Ix = imfilter(double(I), hx, 'replicate');
gradmag = sqrt(Ix.^2 + Iy.^2);
figure('units', 'normalized', 'position', [0 0 1 1]);
subplot(1, 2, 1); imshow(I,[]), title('灰度增强图');
subplot(1, 2, 2); imshow(gradmag,[]), title('梯度幅值图像');
imwrite(gradmag,'2梯度幅值图像.jpg')%保存图像为文件
求梯度时,已经转成了double了,所以结果要转回unit8 程序修改后
clear all
close all
I = imread('1灰度图.jpg');
hy = fspecial('sobel');
hx = hy';
Iy = imfilter(double(I), hy, 'replicate');
Ix = imfilter(double(I), hx, 'replicate');
gradmag = sqrt(Ix.^2 + Iy.^2);
figure('units', 'normalized', 'position', [0 0 1 1]);
subplot(1, 2, 1); imshow(I,[]), title('灰度增强图');
subplot(1, 2, 2); imshow(gradmag/255,[]), title('梯度幅值图像');
imwrite(gradmag,'2梯度幅值图像.jpg')%保存图像为文件
追问请问除以255是什么意思呢
追答结果要转回unit8
请问是什么函数呢,我没找到,请您告诉我,谢谢