Digital halftoning combining dot size modulation screen with dot

Details Digital halftoning combining dot size modulation screen with dot Digital halftoning combining dot size modulation screen with dot

1997-10-02

1999-04-06

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 395109, H04N 140, B41J 1500

Patent

active

058925880

ABSTRACT:
An apparatus and method of producing enhanced digital imaging for printing data or reproduction process data (digital camera data) from the combination of dot size (amplitude) and dot density (frequency) halftone screens, whereof each halftone screen represents continuous "gray tone" (grey tone) input image levels. The method includes creating a dot frequency modulation (FM modulation--dispersed dot technique) in lighter areas which otherwise would require a dot size which is below user definable "dot size limit". This dot frequency modulation randomly deletes dots from the dot area modulation screen (AM modulation--cluster dot technique) in these lighter areas. The percentage of frequency modulation is graduated over the range of gray values which reduces objectionable visual transitions. Enhanced overall definition over the gray scale range of 0 to 100 percent (i.e., where 100 is equal to "255" in 8-bit environment), specifically over the more visually perceptive gray scale range of 0 to 20 (i.e., out of 0-255 value) is achieved. The apparatus which implements the method is positioned intermediate a desktop publishing system and an image setter.

REFERENCES:
patent: 5625755 (1997-04-01), Shu
patent: 5694224 (1997-12-01), Tai
patent: 5726722 (1998-03-01), Parker et al.

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