Edge detection using sobel operator

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Milind Amga 2020-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/608136-edge-detection-using-sobel-operator

评论： J. Alex Lee 2020-10-9

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Can anyone point out what's causing the error in the code below?

Below is the code for detecting edge using sobel operator.

Thank you for your time and effort in advance.

function output = edgy(a)
a = double(a);
[row col] = size(a);
My = [-1 -2 -1;0 0 0;1 2 1];
Mx =[-1 0 1;-2 0 2;-1 0 1];
a3 =zeros(row,col);
for i =1:row-2
    for j=1:col-2
        Gx = sum(sum(Mx.*a(i:i+2, j:j+2)));
        Gy = sum(sum(My.*a(i:i+2, j:j+2)));
        filtered_image(i,j) = sqrt(Gx.^2 + Gy.^2);
    end
end
filtered_image = uint8(filtered_image);
thresholdvalue =100;
output = max(filtered_image,thresholdvalue);
end

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Image Analyst 2020-10-8

Try imfilter().

J. Alex Lee 2020-10-9

Ah ok. If you have access to full matlab (image processing toolbox), look into imfilter() as Image Analyst suggests, but also imgradientxy(). Then later you can look into conv2().

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