How to fill a ROI without affecting outside?

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

Answer 1

[Image Analyst]

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.

[Neda]

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.