Fig. 2

Schematic cell boarder dilation. The single white pixel in image a gets dilated in two steps: b first in vertical direction by a factor of five (c) and this operation is applied to the dilated image in horizontal direction also with a factor of five. In d a typical segment of the binary detected edges image is shown, in e a vertical dilation of all pixels (factor five) and in f an horizontal dilation of all pixels (factor five). g The eroded white areas. The suggest outline from the top left image is now clearly visible