Container including matchings that would generally be possible, that is, each
node in the first skeleton is hypothetically matched to each node in the
second skeleton.
Prepare the image to make sure some conditions are fullfilled:
all pixel values are 0 or 255
tell imagej that this is a binary image
invert the image in case the foreground seems to be black, the
background seems to be white (by now, this is estimated on the pixel in
the upper left corner)
Before applying OSB, the matrix should be prepared: To allow skipping the
first and last elements in the matrix, additional rows and columns are
added.