image processing edge edge detection

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Mohammad abu aqoulah
评论： Ameer Hamza 2020-6-1
how can Apply edge detection to the original RGB image using the "Canny edge Operator"
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Mohammad abu aqoulah
Mohammad abu aqoulah 2020-6-1
i mean
i want to convert RGB image to R , G and B
after that convert R to canny edge
after that convert G to canny edge
after that convert B to canny edge
after that sum three pic
Mohammad abu aqoulah
Mohammad abu aqoulah 2020-6-1
that mean
i have image i want firstly split this image into R , G and B and show 3 images red , green and blue images
secondly apply edge canny in each 3 colore image
canny edge detection on green image (g_d)
canny edge detection on blue image (b_d)
canny edge detection on red image (r_d)
after that add (g_d)+(b_d)+(r_d) to have colore canny detection

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回答（1 个）

Image Analyst
Image Analyst 2020-5-31
Did you try edge():
rgbImage = imread('peppers.png');
subplot(1,2,1);
imshow(rgbImage);
grayImage = rgb2gray(rgbImage);
subplot(1,2,2);
edgeImage = edge(grayImage, 'Canny');
imshow(edgeImage, []);
Or you could do it on each color channel separately if you want.
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Mohammad abu aqoulah
Mohammad abu aqoulah 2020-6-1
the problem is
when i spilt the image into 3 image i mean each image has 1 color and i need the canny edge detection in this color as the folowing
Ameer Hamza
Ameer Hamza 2020-6-1
Mohammad, you can try this modified version of Image Analyst's code.
rgbImage = imread('peppers.png');
subplot(2,2,1);
imshow(rgbImage);
[R, G, B] = imsplit(rgbImage);
subplot(2,2,2);
edgeImageR = edge(R, 'Canny');
R(edgeImageR) = 255;
Rimage = zeros(size(rgbImage), 'uint8');
Rimage(:,:,1) = R;
imshow(Rimage, []);
title('Edge Image of Red', 'FontSize', 15)
subplot(2,2,3);
edgeImageG = edge(G, 'Canny');
G(edgeImageR) = 255;
Gimage = zeros(size(rgbImage), 'uint8');
Gimage(:,:,2) = G;
imshow(Gimage, []);
title('Edge Image of Green', 'FontSize', 15)
subplot(2,2,4);
edgeImageB = edge(B, 'Canny');
B(edgeImageR) = 255;
Bimage = zeros(size(rgbImage), 'uint8');
Bimage(:,:,3) = B;
imshow(Bimage, []);
title('Edge Image of Blue', 'FontSize', 15)

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