Image processing apparatus having a high gradation mode and a high resolution mode of operation
March 7, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLaser recorder Laser recorder reproducing a picture having half-tones of high accuracy Image processing apparatus for combining image and character data Circuit for generating center pulse width modulated waveforms and non-impact printer using same Frostless interface supercooled VLSI system Image processing apparatus Apparatus for non-linear error diffusion thresholding of multilevel video images Image processing apparatus Scanning recording type printing method and apparatus for increasing image quality by controlling tone dot locations within image pixels Digital modulation technique InventorsAssigneeApplicationNo. 883173 filed on 05/15/1992US Classes:358/1.9, Attribute control358/1.13Emulation or plural modesExaminersPrimary: Popovici, DovAttorney, Agent or FirmForeign Patent References
International ClassG06F 015/00Foreign Application Priority Data1991-05-20 JPAbstractAn 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. | |
