hello eveyone
i am just new in image processing using matlab and i wrote a code to detect edge using sobel
and now i wanna implement conv2 algorithm fully and do not use matlab's function
would you please help me?
here is my code
A = imread('/home/debian/Pictures/Image.jpg');
I = rgb2gray(A);
imshow(I)
Z = [-1 0 1; -2 0 2; -1 0 1];
P = [-1 -2 -1; 0 0 0; 1 2 1];
Gx = conv2(I,Z);
Gy = conv2(I,P);
magnitude = sqrt(Gx.^2 + Gy.^2);
direction = atan(Gy/Gx);
thresh = magnitude < 135;
magnitude(thresh) = 0;
imshow(magnitude)
thanks
Follow:
https://www.mathworks.com/matlabcentral/answers/278353-2d-convolution-algorithm-error-vs-conv2-function
In Python:
https://stackoverflow.com/questions/3731093/is-there-a-python-equivalent-of-matlabs-conv2-function
Follow:
https://www.mathworks.com/matlabcentral/answers/278353-2d-convolution-algorithm-error-vs-conv2-function
In Python:
https://stackoverflow.com/questions/3731093/is-there-a-python-equivalent-of-matlabs-conv2-function
see link
https://www.mathworks.com/matlabcentral/answers/108868-edge-detection-using-sobel-operator
https://angeljohnsy.blogspot.com/2011/12/sobel-edge-detection.html
you may use this primitive and simplified code to achieve 2D convolution between an image and a given template.
[irows, icols] = size(image);
[trows, tcols] = size(template);
temporarry(1:irows,1:icols) = 0;
trhalf = floor (trows/2);
tchalf = floor (tcols/2);
for y = trhalf+1 : irows-trhalf
for x = tchalf+1 : icols-tchalf
sum = 0;
for jwin = 1:trows
for iwin = 1:tcols
sum = sum +image(y+jwin-trhalf-1, x+iwin-tchalf-1)*template(jwin, iwin);
end
end
temporarry(y, x) = sum;
end
end
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