We turned on FuzzyOCR's experimental "hashdb" function, but had to
turn it off again after it tagged the following images (hashes) as
spam:
8:1:1:1::1:1:1:1:1
14:1:1:1::0:0:0:0:1
These appear to be "spacer.gif"-like images: small images commonly
used in HTML messages for formatting purposes.
Has anyone else run into this issue?
Related questions:
1. How does FuzzyOCR compute an image hash? Skimming FuzzyOcr.pm shows
this isn't a SHA1/MD5 of the image, but instead depends on ppmhist and
identify (ImageMagick)?
2. How do I FuzzyOCR-hash a given image? The naive way fails:
perl -le 'require "FuzzyOcr.pm"; ($foo, $bar) =
FuzzyOcr::calc_image_hash("filename.gif"); print "$foo,$bar"'
3. If a spammer attaches 1 spam image + 5 good images and the message
gets flagged as spam, do all *six* images get entered into the hashdb?
The log files imply so. Would this explain why commonly-used images
are in the hashdb?
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