Phash.org Website Review

A perceptual hash is a fingerprint of a multimedia file derived from various features from its content. Unlike cryptographic hash functions which rely on the avalanche effect of small changes in input leading to drastic changes in the output, perceptual hashes are close to one Perceptual hashes must be robust enough to take into account transformations or attacks on a given input and yet be flexible enough to distinguish between dissimilar files. Such attacks can include rotation, skew, contrast adjustment and different several perceptual hashing algorithms, and provides a C-like API to use those functions in your own programs. pHash itself is written in 0.9.4 released. Added radial image hash to Ja*a bindings, fixed compilation on Mac OS X with complex header type, and the examples n-dimensional data points. The distance function is configurable as well as the type of data. just simply on the filename or even its metadata. This makes it ideal for such uses as duplicate detection or the protection of copyrights. libraries), cleaned up ja*a bindings, fixed bug in determining number of cpus on mac os x, fixed bug in multi-threaded image, audio and hash can handle RGBA files. Fixed a heap corruption bug in the mvp storage functions. the bug), now works with latest CImg versions, as well as on Windows and BSD systems. improving the video hash to handle longer videos. Look for it in the 0.6 release. leading to better feature extraction. We will also be improving the video hash to account for longer videos. Stay tuned! This technique uses a specially developed file format for persistent storage and can be used for virtually any size hash and distance metric. Preliminary testing reveals a 300% improvement in search time over a simple linear search. For image or audio hashes, additional storage amounts to less than 0.05% of the space used by the actual files. To be included in the 0.5 release! for now, the functions allow for a quick scan of docu*ents to find string matches and their offsets. Expect this in the next release.