Color black holes to white in binary image

Question

I've got the following image:

I want to fill in the black hole and make it white. How can I fill in this hole?

Thank you

Answer 1

You could floodfill with white starting at the top-left corner, which will leave you with this - which should allow you to locate the "hole" .

I have bordered artificially with red so you can see the extent of the image.

Answer 2

apply this method Anyone knows an algorithm for finding "shapes" in 2d arrays?

Images are basically arrays and you can apply this algorithm with little bit modification in order to find holes and set every black pixel in closed shape and set blacks to white