Method and apparatus for converting a gray level pixel image to

Details Method and apparatus for converting a gray level pixel image to Method and apparatus for converting a gray level pixel image to

1997-09-16

2000-02-22

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

382237, 382252, 382270, 358456, 358466, 358298, G06K 1502, H04N 1405

Patent

active

060286776

ABSTRACT:
A dither method converts multi-bit grey level pixel values into an image array of binary level pixel values, wherein the image array is arranged as a raster of scan lines. The method includes the following steps: (i) for each line of grey level pixels, deriving an error value for each grey level pixel of the scan line by finding a difference between a variable threshold value and a grey value of the pixel; (ii) combining the error value with a next-in-line grey level pixel value before deriving an error value therefor; (iii) assigning a first binary value to the pixel if the error value is less than the variable threshold or assigning a second binary value to the pixel if the error value is greater than the variable threshold value; and (iv) deriving the variable threshold values that are compared with grey level pixel values in the scan line, by generating a random value to control generation of the variable threshold value at each pixel site, the random value for each one of a plurality of contiguous scan line evidencing a different value.

REFERENCES:
patent: 4449150 (1984-05-01), Kato
patent: 5201013 (1993-04-01), Kumagai
patent: 5337160 (1994-08-01), Jones
"Digital Halftoning", Ulichney, R., MIT Press, 1987, pp. 63-65, 233,239-243 and 265-271.

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