_mask_filter_result function

[Ankit Agrawal]

Hi Umesh,

           The function `_mask_filter_result` assigns all the boundary
pixels to a 0 value. The reason for this is that applying filter kernels or
edge-detection operators on an image may result in inconsistent values at
boundary pixel because of padding mode used by
scipy.ndimage.filters.convolve<http://scipy.ndimage.filters.convolvehttp://docs.scipy.org/doc/scipy/reference/generated/scipy.ndimage.filters.convolve.html>.
I hope that clears your doubt. Thank you.

Regards,
Ankit Agrawal,
Communication and Signal Processing,
IIT Bombay.
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