- read image as 1-channel grayscale
- 3 trackers to control function parameters
- K allowed to go to negative values (usually to detect black text on white bg)

- no for-loops
- support all thresholding types
- support any input image depth
- add Doxygen comments

otherwise we get a failed assertion from OutputArray::create

This new tutorial shows how the Adelson checkerboard optical illusion can
be reproduced with the bioinspired module. It will be put aside the
already-existent bioinspired tutorial.
Also-by: Antonio Cuni <anto.cuni@gmail.com>

Signed-off-by: Konstantin Volokh <Konstantin.Volokh@transas.com>

Required for MSVC 2008, shouldn't affect results otherwise.

Required for MSVC 2008, shouldn't affect result otherwise.

Required for MSVC builds - shouldn't affect result otherwise.