In recent years, a growing scientific and industrial interest
on perceptual hashing technology has been seen. Many perceptual
hashing algorithms have been developed to establish
the perceptual equality of multimedia objects. Such algorithms
have been developed for different media types, such as
image[l][2], video[3], audio[4] [5], etc. Based on these perceptual
hashing algorithms, different commercial application
schemes have been adopted to provide the ability of forensic
tracking against the illegal use or distribution of multimedia
content.