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How to fill a ROI without affecting outside?

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Steven
Steven on 17 Dec 2013
Commented: Neda on 15 Nov 2017
Hi
I want to specify an ROI (of a binary image) on screen (several times) and make its inside white but do not change the outside. How can I do so?
I used imfill, but it gives me only the choice of choosing one point.
How can I determine the locations (specified by the user on screen) for imfill?
I tried to use this simple code, but it does not do what I want:
Image=binaryImage;
ROI = imfreehand();
ROI_xy = floor(hFH.getPosition)
Image(ROI_xy)=1;
I also used
Image=imfill(Image,ROI_xy);
but it didn't work either.
Could someone help me please with this?
Thanks. Steven

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Accepted Answer

Image Analyst
Image Analyst on 17 Dec 2013
I thought I already showed you in a prior question where I attached my demo (attached again). Anyway, you need to get the binary mask:
hFH = imfreehand();
% Create a binary image ("mask") from the ROI object.
binaryImage = hFH.createMask();
Then use it to make the image white:
grayImage(binaryImage) = 255;
By the way, don't use Image as the name of a variable since image is the name of a built-in function and it will be confusing.

  1 Comment

Neda
Neda on 15 Nov 2017
I tried this to make a mask, but imfreehand isn't enough for me as it's not giving me the exact shape I need. any advice and suggestions will be greatly appreciated.

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