how to save the filled region to as an image

structBoundaries = bwboundaries(binaryImage);  
xy = structBoundaries{i};
fill(xy(:,2),xy(:,1),'w');

how to save the filled region to as an image? when i do

im = fill(xy(:,2),xy(:,1),'w'); 
% im is a patch object

i want "im" as a double datatype or image datatype

i even used poly2mask, but only one region comes at a time, i need 2 regions out of 5 regions from structBoundaries to come in the mask

Answer 1

[Rik]

You can create a binary mask in your desired resolution with this FEX submission. You can then use that mask to set the pixels in any color you like.

Edit:

If you have binary masks for one region at a time with poly2mask, you can just use the binary OR ('|') to merge multiple masks.