Data compression and expansion of a digital information signal

Details Data compression and expansion of a digital information signal Data compression and expansion of a digital information signal

2002-12-18

2008-09-02

Alavi, Amir (Department: 2624)

Image analysis

Image compression or coding

Lossless compression

C341S107000

Reexamination Certificate

active

07421138

ABSTRACT:
A data compression apparatus receives a digital information signal, determines a probability signal from the digital information signal and at least one previously determined value of the probability signal, entropy encodes the digital information signal into a compressed digital information signal, in response to the probability signal, and transmits or records the compressed signal. Also, a data expansion apparatus receives the compressed signal and entropy decodes the compressed signal into a expanded replica of the digital information signal, in response to a second probability signal determined from the replica and at least one previously determined value of the second probability signal. Thus, complex division operations can be avoided.

REFERENCES:
patent: 6229463 (2001-05-01), Van Der Vleuten et al.
patent: 6269338 (2001-07-01), Bruekers et al.
patent: 6778965 (2004-08-01), Bruekers et al.
patent: 2005/0073449 (2005-04-01), Van Der Vleuten

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