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Posted by Greg N. on 01/03/06 18:42
..:|:. wrote:
> Moreover, if so many sites create warped images in order to
> prevent OCR programs from reading text even from there, I
> wonder whether that's really a perfect solution.
I think, for the purpose of email address obfuscation, it currently is a
perfect solution.
Those pages that work with validation codes are somewhat predictable, a
junk bot knows how to analyze them, it knows exactly where the image is
that contains the validation code. For the bot, an OCR attempt would
make sense.
Consequently, those sites try to thwart OCR attempts by warping and
smudging their validation code images, often somewhat beyond human
readability.
An email address on an individual, unique web page is something else.
If you don't give obvious hints in the context or ALT annotation, the
spam bots don't know where to look and have no chance getting at your
email address, short of attempting to OCR each and every single image.
--
Gregor's Motorradreisen:
http://hothaus.de/greg-tour/
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