Apparatus and method for gray and edge enhancement

Details Apparatus and method for gray and edge enhancement Apparatus and method for gray and edge enhancement

1991-05-08

1994-06-14

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

H04N 121

Patent

active

053214307

ABSTRACT:
An apparatus and method for improving the printing and edge enhancement of laser printers comprises a video clock counter, an input selector, a calibration selector, a mode selector, a decoding array, a register, memory and an address counter. The gray and edge enhancement circuit modifies the data received from the laser print controller to smooth edges in the image sent to the laser. The present invention compares each pixel and surrounding pixels in an area seven pixels wide and seven pixels long to correction bit patterns. If a match is found the pixels are modified to enhance any edges defined by the pixels. The gray and edge enhancement circuit also includes an operating mode in which shades of gray may be printed with a resolution of 150 dpi. The circuit uses the decoding array to pulse width modify the input data to various shades of gray.

REFERENCES:
patent: 4951159 (1990-08-01), Van Beck
patent: 4963989 (1990-10-01), Morton
patent: 4987484 (1991-01-01), Ikeda et al.
patent: 5157773 (1992-10-01), Matsumoto et al.

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