Printer and image processing device for the same

Details Printer and image processing device for the same Printer and image processing device for the same

2007-10-23

2007-10-23

Lee, Thomas D. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003100, C358S534000

Reexamination Certificate

active

10616454

ABSTRACT:
A printer is capable of expressing halftones by forming halftone spots in cells each having a plurality of pixels by irradiating an exposure beam. The printer comprises a halftone processing section for converting M-bit image data into N (M>N)-bit drive pulse width data for driving the exposure beam. The halftone processing section includes a threshold matrix including a plurality of threshold values corresponding to the plurality of pixels, and a converter circuit which compares a plurality of threshold values output from the threshold matrix with image data, and generates drive pulse width data in accordance with the comparison result. Random noise is superposed on the plurality of threshold values or the image data, and the resultant is subjected to the comparison, whereby generation of tone jump is suppressed. The halftone processing section further includes pulse position determining means for determining a position of a drive pulse for a pixel under processing in accordance with drive pulse width data of pixels adjacent to the pixel under processing, and a pulse width modulator for generating a drive pulse signal at the determined drive pulse position according to the drive pulse width data.

REFERENCES:
patent: 5729663 (1998-03-01), Lin et al.
patent: 5757976 (1998-05-01), Shu
patent: 6-253134 (1994-09-01), None
patent: 7-250240 (1995-09-01), None
patent: 11-328357 (1999-11-01), None
patent: 2000-341524 (2000-12-01), None

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