Fill in boundaries in Image

How can I fill in the red regions in the image below given by:

%DrawRegions from Binary onto raw image:
    labeledImage = bwlabel(Back, 8);     % Label each blob so we can make measurements of it
    blobMeasurements = regionprops(labeledImage, ROI, 'all');     %ROI is original image
    numberOfBlobs = size(blobMeasurements, 1);
    hold on;
    boundaries = bwboundaries(Back);  
    numberOfBoundaries = size(boundaries);
    subplot(4,5,[1,2,6,7])
    hold on
    for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
   plot(thisBoundary(:,2), thisBoundary(:,1), 'r.', 'LineWidth', 1);
    end
    hold off;

i.e. the red boundaries in the image.

[Mohammad Abouali]

What do you want to fill it with?

And a side question, the red region apparently comes from the bwlabel of Back. Isn't Back already filled red region then?

[Jason]

Hi. I want everything inside the red region to be red. Back is binary image representing my calc of background. I then transfer this these regions on the original gray image

[Pete sherer]

any solutions to this? I am trying to do the same

[Image Analyst]

Mohammad's code worked for Jason. Doesn't it work for you? If not, post your image and code in a new question.

Answer 1

[Mohammad Abouali]

Ok, but the red lines is pretty much the boundary of the regions in the binary image stored in the variable called back, right?

If that is the case, and assuming your raw-image is a one layer gray scale image, i.e. size of raw_image is NxMx1 (based on your past posts then 101x101) then here is what you should do

RGB(:,:,1)=min(double(Back)+double(raw_image)./max(double(raw_image(:))),1);
RGB(:,:,2)=double(raw_image)./max(double(raw_image(:)));
RGB(:,:,3)=double(raw_image)./max(double(raw_image(:)));

Of course Back needs to be the same size as of raw_image.

[Jason]

Perfect, thankyou.