Implementing Sobel Gradient without image package

Question

scarlett05 2018-4-6

2
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/393114-implementing-sobel-gradient-without-image-package

回答： Andrew Davies 2018-4-6

I am supposed to apply a Sobel filter on an image in Octave, but I am not allowed to use any functions from the image package. I wrote the code but my output is just a black image. Here is what I have so far: (Thank you in advance!)

    kx= [1 ,0 ,-1; 2,0,-2; 1, 0 ,-1];
    ky= [1,2,1; 0,0, 0; -1, -2 ,-1];
    H = conv2(kx,im2double(my_img),'same');
    V = conv2(ky,im2double(my_img),'same');
    E = sqrtm(H.*H + V.*V);
    figure 4
    imshow(E, [])

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Answer 1

Andrew Davies 2018-4-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/393114-implementing-sobel-gradient-without-image-package#answer_313821

在 MATLAB Online 中打开

    kx= [1 ,0 ,-1; 2,0,-2; 1, 0 ,-1];
    ky= [1,2,1; 0,0, 0; -1, -2 ,-1];
    H = conv2(im2double(my_img),kx,'same');
    V = conv2(im2double(my_img),ky,'same');
    E = sqrt(H.*H + V.*V);
    imshow(E, [])