Method and apparatus for image processing utilizing pulse width

Details Method and apparatus for image processing utilizing pulse width Method and apparatus for image processing utilizing pulse width

1995-03-21

1997-08-12

Fuller, Benjamin H.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347131, B41J 247, G01D 1514

Patent

active

056570716

ABSTRACT:
A method of processing image data to reproduce an image having good half-tone reproduction, sharpness, and details, through pulse modulation of a laser beam. In the method, the laser beam is turned on and off in accordance with the result of comparing an input image signal with a reference signal which has been frequency modulated in accordance with a shape feature of the input image signal. In the case of an image having low input contrast, the tone performance of an image output unit is improved by the mesh dots of the low spatial frequency. In the case of an image having high input contrast, an image having high sharpness and details is reproduced by the mesh dots of the high spatial frequency.

REFERENCES:
patent: 5485534 (1996-01-01), Takemoto et al.

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