MATLAB: Cropping a particular object in an image

cropcroppingdigital image processingimageimage analysisimage processingobject

Hello,

I need to crop a specific object from an image, I have the object annotated and I also have the pixels of the boundaries of the object. Now I want to crop that particular object and nothing else. Please help me out.

Thanks.

Best Answer

You said you " have the pixels of the boundaries of the object", so simply use them as indexes:

croppedImage = originalImage(row1:row2, col1:col2); % Gray scale.
croppedImage = originalImage(row1:row2, col1:col2, :); % If color RGB image.

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MATLAB: Cropping image

To crop you can use imcrop(), or simply use indexing:

croppedImage = fullImage(row1:row2, col1:col2);

MATLAB: How to remove white background from image

I'd use min() to get the min in all three color channels. Then use bwareafilt() to get just the largest blob. This will be the rectangle. You can use find to find the first and last row and column and finally crop the image, something like this untested code.

grayImage = min(rgbImage, [], 3);
binaryImage = grayImage < 200;
binaryImage = bwareafilt(binaryImage, 1);
[rows, columns] = find(binaryImage);
row1 = min(rows);
row2 = max(rows);
col1 = min(columns);
col2 = max(columns);
% Crop
croppedImage = rgbImage(row1:row2, col1:col2, :);

Best Answer

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MATLAB: Cropping image

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