Image filter processing apparatus and method

Details Image filter processing apparatus and method Image filter processing apparatus and method

2006-08-01

2006-08-01

Couso, Yon J. (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S264000, C382S270000

Reexamination Certificate

active

07085427

ABSTRACT:
A memory stores an output value as a filter processing result. A first calculator calculates a difference between an input value of an image signal and the output value stored in the memory. The output value is the filter processing result of a previous input value. A lookup table stores a plurality of difference values and change values, and outputs the change value corresponding to the difference calculated by the first calculator. The change value is a product of the difference and a value which is above “0” and below “1” if an absolute value of the difference is below a threshold, and the change value is a product of the difference and a value which is above “−1” and below “0” if the absolute value is above the threshold. A second calculator outputs a difference between the input value and the change value.

REFERENCES:
patent: 5202764 (1993-04-01), Ida et al.
patent: 5581371 (1996-12-01), Spaulding et al.
patent: 6347161 (2002-02-01), Mancuso
patent: 6681054 (2004-01-01), Gindele

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