Digital image forming apparatus

Details Digital image forming apparatus Digital image forming apparatus

1994-12-28

1998-03-17

Coles, Sr., Edward L.

Image analysis

Histogram processing

With pattern recognition or classification

382168, 358522, 358501, 358455, 358401, 358298, 358300, 358462, 358475, G03F 308, H04N 104

Patent

active

057296260

ABSTRACT:
In a digital image forming apparatus, a document image is read as digital data, and an image type of bi-level image or multi-level image is discriminated from the digital data. For a bi-level image, an intensity of laser beam for exposing a photoconductor is modulated according to the image data with a duty ratio of 100%. On the other hand, for a multi-level image such as a photograph image, the intensity of laser beam is modulated with a duty ratio in the unit of two or more dots according to the image data. The duty ratio and the laser output power are changed according to a type of document image or according to sensitivity characteristic of the photoconductor.

REFERENCES:
patent: 4574393 (1986-03-01), Blackwell et al.
patent: 4679057 (1987-07-01), Hamada
patent: 5189441 (1993-02-01), Fukui et al.
patent: 5255330 (1993-10-01), Huynh et al.
patent: 5333038 (1994-07-01), Mizoguchi et al.
patent: 5410619 (1995-04-01), Fujisawa et al.
patent: 5412737 (1995-05-01), Govrin
patent: 5414538 (1995-05-01), Eschbach
patent: 5420617 (1995-05-01), Fukui et al.
patent: 5438437 (1995-08-01), Mizoguchi et al.
patent: 5467196 (1995-11-01), Fukushima et al.

Affiliated with

Also associated with

Rating

Digital image forming apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital image forming apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital image forming apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-965211