what is the best method for resizing a binary mask to preserve its shape?

i hame a binary mask that whwn i multiply it with the CT scan image it gives me the tumor part of the image. now i want to resize the mask and CT image to another scale and then multiply them, but i want the shape of the mask to be preserved. im using a cubic interpolation for resizing the original CT image but im not sure whats the best method for resizing the mask. can anyone help?

Answer 1

[KALYAN ACHARJYA]

Have you tried with any approach, resizing the binary mask doesnot effect on its shape?

#Simple way

mask_modified=mask(1:2:end,1:2:end);
image_modified=image_gray(1:2:end,1:2:end);

Request you to see imresize and apply both images (mask & original) with same method.

Why are you doing such a way? You can do the same in original image before processed for mask may be easier way.

[mehdi amini]

yes i have resized the binary mask with three nearest, bilinear, and cubic methods and resulted shapes are different. the original mask was 512*512 and i downsammpled it to 256*256

[mehdi amini]

and im doing it because i want to segment a registered pet scan with this mask that is 256*256

[KALYAN ACHARJYA]

Can you show us these two images 512*512 and 256*256 ?