Impoly to choose all the ROI

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!

Answer 1

[Adam]

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.

[Ann G]

Thank you very much!!

[Ann G]

Could you explain to me a little bit more the jIm parameter?

[Walter Roberson]

http://www.mathworks.com/help/images/create-binary-mask-using-an-roi-object.html

[Ann G]

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]

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;