how can fill gaps in binary image?

how can I fill gaps (red)in this binary image? I've used this method but I dont know how can fill gaps here!!

http://uk.mathworks.com/matlabcentral/answers/111131-how-to-fill-the-region-of-interest-by-white-color

Answer 1

[Image Analyst]

What do you want to fill the gap with? A uniform color, like white? If so...

grayImage(row1:row2, col1:col2) = 255;

[Abo]

thank you for your answer. yes, uniform color (white), but I dont know how can I use 'grayImage(row1:row2, col1:col2) = 255;' in the mentioned demo?

[Image Analyst]

What is the name of your image variable? Replace my "grayImage" with your variable name. What rows and columns do you need replacing? Just assign them to row1, row2, col1, and col2.