no sorry, i've never needed to implement something like this. i honestly only just thought of this after taking a look at the OP's project.
you'd need to be somewhat clever about constructing the filter(s) though. you want to make sure that the output still resembles the input. my guess is that it isn't a trivial problem and would depend on the font and alphabet.
if it turns out that you can do this with a linear filter, then you just need to convolve the two images. as far as implementing 2d convolution... that's easy:
http://www.mathworks.com/help/techdoc/ref/conv2.html
http://docs.scipy.org/doc/scipy/refe...onvolve2d.html
if you could use different filters (or sets of filters) to mimic different personality profiles that would be nifty. try and fool a handwriting analyzer
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