Edge Detection in Matrix Form

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can evkuran
can evkuran 2018-12-19
评论： can evkuran 2018-12-19
Hi my main problem is how can i detect edges in 3x3 matrix not image my values are
matrix 7 8 9;4 5 6;1 2 3
edge detector 1 2 3; 4 5 6; 7 8 9
please help me for detecting matrix edges with convolution

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回答（1 个）

Image Analyst
Image Analyst 2018-12-19
Try this:
grayImage = imread('moon.tif');
subplot(1, 2, 1);
imshow(grayImage, []);
impixelinfo
edgeDetector = [1 2 3; 4 5 6; 7 8 9]; % Not a good edge detector!
edgeDetector = [1 1 1; 0 0 0; -1 -1 -1]; % Better edge detector.
filteredImage = conv2(double(grayImage), edgeDetector, 'same');
subplot(1, 2, 2);
imshow(filteredImage, []);
impixelinfo
0000 Screenshot.png
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Image Analyst
Image Analyst 2018-12-19
So just replace the moon image with your image or matrix. I thought you'd understand to do that, but anyway, here it is:
matrix = [7 8 9; 4 5 6; 1 2 3]
subplot(1, 2, 1);
imshow(matrix, []);
impixelinfo
edgeDetector = [1 2 3; 4 5 6; 7 8 9]; % Not a good edge detector!
% edgeDetector = [1 1 1; 0 0 0; -1 -1 -1]; % Better edge detector.
filteredImage = conv2(matrix, edgeDetector, 'same');
subplot(1, 2, 2);
imshow(filteredImage, []);
impixelinfo
0000 Screenshot.png
Now, you know that the filter window can only fit complete inside your matrix at ONE location, don't you?
can evkuran
can evkuran 2018-12-19
I understand now thanks for your help. if i have a problem ı wıll type here regards

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