Function close

In mathematical morphology, the closing of a set A by a structuring element B is the erosion of the dilation of that set (Wikipedia). In image processing, closing is, together with opening, the basic workhorse of morphological noise removal. Opening removes small objects, while closing removes small holes.

See

http://docs.opencv.org/2.4/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.html

In mathematical morphology, the closing of a set A by a structuring element B is the erosion of the dilation of that set (Wikipedia). In image processing, closing is, together with opening, the basic workhorse of morphological noise removal. Opening removes small objects, while closing removes small holes.

See

http://docs.opencv.org/2.4/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.html