Automatic ROI selection in image

Question

venkat vasu 2014-1-20

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https://ww2.mathworks.cn/matlabcentral/answers/112961-automatic-roi-selection-in-image

评论： Image Analyst 2020-9-2

Hi every one...

 I am doing image processing project here i need automatic roi selection like i have segmented the 
image in that i have segmented tumor i need to crop automatically. for this any ready made matlab code 
or any help is fine.

Thanks in advance...

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Answer 1

Image Analyst 2014-1-20

1
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https://ww2.mathworks.cn/matlabcentral/answers/112961-automatic-roi-selection-in-image#answer_121489

See my Image Segmentation Tutorial. It goes over all that.

http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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Anita De Pisi 2020-9-1

Hi! I tried to do the same thing with my image but it doesn't work, I think because the background does not differ at all from the objects. How could I solve this? Thanks for your help.

Image Analyst 2020-9-2

在 MATLAB Online 中打开

Anita, first of all try a noise reduction method like median filter medfilt2(), or non-local means imnlmfilt(). Then I'd get an average vertical profile and divide the image by it to compensate for vertical shading

verticalProfile = sum(grayImage, 2);
verticalProfile = verticalProfile / max(verticalProfile); % Normalize 0-1
[rows, columns, numColorChannels] = size(grayImage)
shadingImage = repmat(verticalProfile(:), 1, columns);
imshow(shadingImage, []);
flattenedImage = double(grayImage) ./ shadingImage;

Then try thresholding the flattened image. Or if that doesn't work you can play around with CLAHE : adapthisteq() to flatten the background shading.

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