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Perceptual hashing library

Unlike cryptographic hash functions which rely on an avalanche effect of changes in input leading to drastic changes in the output, perceptual hashes are "close" to one another if the inputs are visually or auditorily similar.

Perceptual hashes have applications in searching, identifying potential copyright infringement, locating duplicates etc. - since a fingerprint of a file is usually less than 1% of the original media file's size, the fingerprint can be stored in a database and used for semantic searching, such as finding all images that look like another.

pHash implements several perceptual hashing algorithms and provides a C++ API to use those functions in your own programs.

Package version:0.9.0-2+b1


libphash (0.9.0-2+b1) unstable; urgency=low

  * Binary-only non-maintainer upload for i386; no source changes.
  * Rebuild against new libjpeg to pick up versioned symbols

 -- i386 Build Daemon (murphy) <>  Sun, 05 Sep 2010 00:29:55 +0000

libphash (0.9.0-2) unstable; urgency=low

  * Added patch 01_build_on_kfreebsd.dpatch: testing libc variant rather than


03.27.2010 added multithreaded image, video and audio hash functions to take advantage of
	   multiple cores/cpus.
03.24.2010 fix heap corruption error in mvp functions. fix ph_readaudio to read ogg and flac
	   audio files in addition to .wav and .mp3.
	   Fix bug in ph_dct_image hash to handle rgba images.
03.18.2010 add example files: build_mvptree_dctimage.cpp , add_mvptree_dct.cpp, query_m


update design docs with new video algorithm and api
add optimized dct
create one pass hash
pHash Pro (detailed comments, support, one-pass hash?, multi-threaded/process, tcp/ip service?)
pHash Forensics (signature, iris, fingerprint) & gui app



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