Clear Filters
Clear Filters

Automatic ROI selection in image

22 views (last 30 days)
venkat vasu
venkat vasu on 20 Jan 2014
Commented: Image Analyst on 2 Sep 2020
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...

Answers (1)

Image Analyst
Image Analyst on 20 Jan 2014
See my Image Segmentation Tutorial. It goes over all that.
Anita De Pisi
Anita De Pisi on 1 Sep 2020
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 on 2 Sep 2020
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.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!