Automatic ROI selection in image

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venkat vasu
venkat vasu 2014-1-20
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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回答（1 个）

Image Analyst
Image Analyst 2014-1-20
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
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
Image Analyst 2020-9-2
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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