How to change pixel value of boundary pixel?

Hi, I need to change the boundary pixel into value ('2') of my binary image, How can I do this?. After that, I need to do some operation on the internal line (junction). Thanks

Answer 1

[Image Analyst]

It won't be binary if you set a value of 2. Binary images are only true/false, or 1/0 if viewing as a number. However if you use an int32, uint8, or double image you can set the edges to 2. Assuming your definition of boundary is the top and bottom lines and the left and right columns, you can do this:

grayImage(:,1) = 2;
grayImage(:,end) = 2;
grayImage(1,:) = 2;
grayImage(end,:) = 2;

If, instead, you want to set the white pixels of the image to 2, assuming you can do this

binaryImage = grayImage > 0; % All white pixels.
grayImage(binaryImage) = 2; % Change from 1 or 255 or whatever, into 2.

[M.S. Khan]

Hi Community members;

i want to repeat the same question.

if i want to keep the boundary of closed binary image as 1 but want to fill the interior with any other number using imfil(bW,'holes').

Please anyone can help me.

Regards and greetings