ImageJ，Java：如何将红色像素所包围的像素设置为红色（避免出现孔）

Question

I have the following problem:

I have written a plugin for ImageJ, which sets specific pixels (the blue ones = cells) to the color red.

Result after setting the blue pixels red

Now I also want to set also all the pixels, which are inside a marked area, to red.

So I don't want to have any holes .

Example for a hole:

I searched the web for hours, but I didn't find anything. I hope somebody knows how I should deal with this issue.

Answer 1

Perhaps it is because the value of blue pixels varies. A better way would be to detect edges and then use flood fill algorithm to fill in the regions inside the boundary.

Found one sample code here http://imagej.net/Level_Sets with github source https://github.com/fiji/level_sets/ .