Image processing apparatus and method

Details Image processing apparatus and method Image processing apparatus and method

1990-01-02

1992-09-01

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 358458, H04N 140

Patent

active

051444569

ABSTRACT:
An image processing apparatus includes a comparator which determines whether input gradation levels of pixels included in a predetermined matrix are equal to or higher than a reference gradation level. The apparatus further includes a converter which converts the input gradation levels of the pixels equal to or higher than the reference gradation level into a predetermined gradation level less than the reference gradation level and for passing the input gradation levels of the pixels less than the reference gradation level as they are, and an averaging circuit which averages the predetermined gradation level of each of the pixels having the input gradation levels equal to or higher than the reference gradation level and the input gradation levels of the remaining pixels other than the pixels relating to the reference gradation level to thereby output an averaged gradation level of a pixel of concern. Moreover, the apparatus includes an output circuit which derives a background corrected gradation level of the pixel of concern from the predetermined gradation level relating to the pixel of concern and the averaged gradation level.

REFERENCES:
patent: 4298895 (1981-11-01), Arai et al.
patent: 4760464 (1988-07-01), Sakano
patent: 4851920 (1989-07-01), Sakano
patent: 4984283 (1991-01-01), Sakano

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