Halftone processing apparatus using distributing PWM method

Details Halftone processing apparatus using distributing PWM method Halftone processing apparatus using distributing PWM method

2005-03-22

2005-03-22

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S534000, C358S003060, C358S003090, C382S237000, C347S131000, C347S196000, C347S252000

Reexamination Certificate

active

06870638

ABSTRACT:
An image processing apparatus for a laser printer, wherein a halftone control through laser pulse modulation (PWM) is used in combination with distributed clustered-dot halftone processing which distributes a tone level over four clustered-dots, and the value represented by higher bits of a threshold are used to switch a PWM pulse pattern in a highlight area to a discontinuous pattern, thereby implementing the high density halftone processing, which provides a high highlight tone density and stability, only with a small scale memory and circuit.

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Yasuhiro Oda et al., “New Halftone Screening Technology focused on highlight image reproduction”,Japan Hardcopy '95 Transactions,pp. 143-146.

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