Area recognizing device and gradation level converting device em

Details Area recognizing device and gradation level converting device em Area recognizing device and gradation level converting device em

1997-02-11

1999-06-29

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382254, 382260, 358448, 358458, 358464, G04K 940, H04N 138, H04N 140

Patent

active

059179554

ABSTRACT:
A first converting circuit converts K-level image data, and suppresses a diffusion range of data by an N-level converting circuit. The N-level converting circuit converts a K-level image into an N-level gradation image (K>N). An image memory stores the N-level gradation image. An estimating circuit converts the N-level gradation image into an M-level gradation image (N<M). A second converting circuit returns the M-level gradation image into the form before the conversion according to a conversion amount from the first converting circuit. Accordingly, density ripple can be suppressed even in a small scanning aperture. A control circuit sets a conversion table to the first converting circuit and the second converting circuit according to a setting signal from a control panel, and outputs a control signal to the estimating circuit, so that processing mode is set in responsive to different images, and image quality is adjusted.

REFERENCES:
patent: 4758897 (1988-07-01), Hiratsuka et al.
patent: 4841377 (1989-06-01), Hiratsuka et al.
patent: 5231677 (1993-07-01), Mita et al.
patent: 5333211 (1994-07-01), Kanda et al.
patent: 5392137 (1995-02-01), Okubo
patent: 5454052 (1995-09-01), Kojima

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