Blended look-up table for printing images with both pictorial an

Details Blended look-up table for printing images with both pictorial an Blended look-up table for printing images with both pictorial an

1996-02-29

1998-03-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

395102, 395114, 358462, 358515, 358518, 358520, G06F 1500, H04N 140, G03F 308

Patent

active

057348022

ABSTRACT:
A method and apparatus for blending pictorial and graphical look-up tables is provided. The blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal. Printer signals output by both the graphical and pictorial look-up tables are weighted in accordance with the proportions of graphical and pictorial character container in the desired image signal, determined from the difference in saturation between the desired image signal and the selected graphical and pictorial image signals. The weighted printer signals are added and mapped to the desired image signal, the mapping being stored in an image signal translator.

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"Gamut Mapping Computer Generated Imagery", by William E. Wallace and Maureen C. Stone, SPIE vol. 1460 Image Handling and Reproduction Systems Integration (1991) (The year of publication of this reference is sufficiently earlier than the effective U.S. filing date so that the particular month of publication is not an issue).
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