MATLAB Answers

Impoly to choose all the ROI

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Ann G
Ann G on 2 Oct 2015
Commented: Image Analyst on 6 Oct 2015
Hello! I would like to ask, how can I use impoly to choose all the ROI and not just the polygon that is around it!

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Accepted Answer

Adam
Adam on 2 Oct 2015
Edited: Adam on 2 Oct 2015
mask = createMask( hROI, hIm );
should give you a binary mask for the region, where hROI is your impoly and hIm is the handle of image on which it was drawn.

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Ann G
Ann G on 6 Oct 2015
Thank u for your help but unfortunately i still have a problem because i dont want a mask. Using mask as a return I get 0s and 1s and I need the elements of the ROI as they are!
Image Analyst
Image Analyst on 6 Oct 2015
This will apply the mask to the original image to erase the original pixels everywhere outside the mask:
% Initialize output to be same as input.
maskedImage = grayImage;
% Now erase pixels outside the mask.
maskedImage(~mask) = 0;

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