Image processing apparatus having a high gradation mode and a hi

Details Image processing apparatus having a high gradation mode and a hi Image processing apparatus having a high gradation mode and a hi

1992-05-15

2000-03-07

Popvici, Dov

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 113, G06F 1500

Patent

active

060347872

ABSTRACT:
An image processing apparatus includes an input device which inputs a digital input signal expressing a gradation, and a timing signal generator generates a predetermined timing signal. A delay device delays the timing signal in accordance with the gradation expressed by the digital input signal, and a pulse width modulation signal generator generates a pulse width generation signal having a pulse width in accordance with the gradation of the digital input signal, based upon the signal delayed by the delay device. An intermediate gradation is expressed by controlling on the ON/OFF time of a laser beam without the need for offset and gain adjustments which are characteristics of an analog circuit. In a first mode, one dot is formed in correspondence with one pixel of the digital input signal, and in a second mode one dot is formed in correspondence with a plurality of pixels of the digital input signal.

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