Reduce noise in the binary image using non linear spatial filtering of mode

Noise is a problem that is often encountered when separating the object from the background in the binary image. Noise may occur in the background and the object, can be spot or patchy and the tassel is connected to the object. The research segmentation of pupil object from eye image, tries to using non-linear spatial filtering of mode to reduce noise in the binary image. Using this filtering at the binary image, can be reduced the both of black noise at the background and the white noise at the object image. Also reduce spot noise and tassel noise.