Fast response discrete time infinite impulse response (IIR)...

Details Fast response discrete time infinite impulse response (IIR)... Fast response discrete time infinite impulse response (IIR)...

2011-05-24

2011-05-24

Seth, Manav (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C345S204000

Reexamination Certificate

active

07949198

ABSTRACT:
An infinite impulse response (IIR) filter provides fast response time without significant effects of ringing or overshoot. In a first step, an input signal is received and a preliminary output signal is computed based upon at least the input signal and a prior output signal. The preliminary output signal is compared to the input signal, and if the preliminary output signal and the input signal differ by more than a significant amount, the input signal is provided as the output signal. Otherwise, the preliminary output signal can be provided as the output signal. Such a filter be readily implemented in software or other programmable logic, and may have particular utility in preserving the contrast in a filtered video image represented by discrete digital data within a display system.

REFERENCES:
patent: 6199084 (2001-03-01), Wiseman
patent: 6330371 (2001-12-01), Chen et al.
patent: 6459817 (2002-10-01), Matsushiro
patent: 6600495 (2003-07-01), Boland et al.
patent: 6671071 (2003-12-01), Kletter
patent: 6677994 (2004-01-01), Kobayashi

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