How can I make automatic crop?

2018 6 24
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更新时间：2018 6 25
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Hello
How can I make automatic crop around core? like
.

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Rik
Rik 2018-6-24
Have a read here (or here for more general advice) and here. It will greatly improve your chances of getting an answer.

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Image Analyst
Image Analyst 2018-6-24

0 个投票

Why do you need to crop it?
Anyway, if you do for some reason, you can just binarize and look for the min and max row and column.
binaryImage = imbinarize(grayImage);
[rows, columns] = find(binaryImage);
row1 = min(rows);
row2 = max(rows);
col1 = min(columns);
col2 = max(columns);
croppedGrayImage = grayImage(row1:row2, col1:col2);
imshow(croppedImage);

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wisam kh
wisam kh 2018-6-24
Thank you But the crop must be surround a specific point that varies from one image to another, I tried your suggestion and did not succeed
Image Analyst
Image Analyst 2018-6-24
Please post your original gray scale image and the code that you used to binarize and crop the image.
wisam kh
wisam kh 2018-6-24
编辑：wisam kh 2018-6-24
</matlabcentral/answers/uploaded_files/122639/imge_with%20core.jpg> this image after preprocessing and finde the core
</matlabcentral/answers/uploaded_files/122640/crop_img.jpg> this image after crop
I am currently using this code But crop measurements are not uniform for all images [X,Y]=get_core(binarize_img); % find core point
i1=X-30;
i2=X-30;
i3=Y-30;
i4=Y-30;
M = imcrop(original_img,[i1 i3 i2 i4]);
figure, imshow(M);title('crop Image');
Image Analyst
Image Analyst 2018-6-24
编辑：Image Analyst 2018-6-24
Well there's the problem. You totally ignored my code in my answer, and did it your own (wrong) way. Why?
http://www.mathworks.com/matlabcentral/answers/13205#answer_18099
wisam kh
wisam kh 2018-6-25
I am sorry sir, I did not ignore your answer, but I tried it and did not succeed.
BW=im2bw(img,0.8);
[rows, columns] = find(BW);
row1 = min(rows);
row2 = max(rows);
col1 = min(columns);
col2 = max(columns);
croppedImage = img(row1:row2, col1:col2);
figure, imshow(croppedImage);title('crop Image');
but the problem was here: BW=im2bw(img,0.8);
that should be : BW=~im2bw(img,0.8);
Now the problem has been solved
am sorry
Thank you so much for your time and effort
I apologize to you again

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