Method and apparatus for halftoning of images in a printer

Details Method and apparatus for halftoning of images in a printer Method and apparatus for halftoning of images in a printer

1997-06-17

1999-09-07

Popovici, Dov

Image analysis

Histogram processing

For setting a threshold

382224, 382251, 382237, 358534, 358456, 358429, 358462, 358467, G06F 1500

Patent

active

059499648

ABSTRACT:
A method for halftoning an image to be rendered onto a media sheet includes the steps of: classifying data portions of a received data stream into one of plural image types, each image type to be subjected to a particular halftone procedure; assigning to each data portion of a common image type, a common identifier and then converting the data portions into a raster representation; subjecting segments of the raster representation to individualized halftone procedures, each segment of the raster representation that is assigned a common identifier being subjected to an identical halftone procedure; and rendering the raster representation onto a media sheet, subsequent to the halftone process. The apparatus for performing the halftone method places the halftone operation subsequent to the rasterization operation and thereby avoids anomalies which occurred in the prior art. Further, the apparatus enables halftone tables which are utilized during the halftone procedure to be altered so as to enable improvements to the halftone method.

REFERENCES:
patent: 5337160 (1994-08-01), Jones
patent: 5542031 (1996-07-01), Douglass et al.
patent: 5704021 (1997-12-01), Smith et al.
Journal of Electronic Imaging, vol. 3(3)., Jul. 1994, pp. 257-275 Peter R. Jones, "Evolution of Halftoning Technology in the Unites States Patent Literature".

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