Creation of reverse look-up table

Details Creation of reverse look-up table Creation of reverse look-up table

2005-07-19

2005-07-19

Coles, Edward (Department: 2722)

Facsimile and static presentation processing

Natural color facsimile

Color correction

C358S001900, C358S001150

Reexamination Certificate

active

06919975

ABSTRACT:
Creation of a reverse look-up table from a forward look-up table for a color device. Indexes to the forward look-up table span all possible color stimulus values for the color device in a device dependent color space. Outputs from the forward look-up table span a color gamut of corresponding color response values for the color device in a device independent appearance color space. The reverse look-up table maps a color response value in the device independent appearance color space to a color stimulus value in the device dependent color space. Indexes to the reverse look-up table span beyond the color gamut of color response values for the color device, and outputs from the reverse look-up table span beyond all possible color stimulus values for the color device. According to the invention, a first portion of the reverse look-up table, in which indexes fall within the color gamut, is populated by search and interpolation in the forward look-up table for color stimulus values corresponding to color response values of the indexes to the first portion of the reverse look-up table. A second portion of the reverse look-up table, in which indexes fall outside of the color gamut, is populated by extrapolation from extrapolation color stimulus values. The extrapolation color stimulus values are found by search and interpolation in the forward look-up table for color stimulus values corresponding to color response values near a boundary of the color gamut.

REFERENCES:
patent: 5296923 (1994-03-01), Hung
patent: 5299291 (1994-03-01), Ruetz
patent: 5323249 (1994-06-01), Liang
patent: 5412491 (1995-05-01), Bachar
patent: 5463480 (1995-10-01), MacDonald et al.
patent: 5608549 (1997-03-01), Usami
patent: 5625378 (1997-04-01), Wan et al.
patent: 5704026 (1997-12-01), Wan
patent: 5719965 (1998-02-01), Degi et al.
patent: 5721572 (1998-02-01), Wan et al.
patent: 5739928 (1998-04-01), Scott
patent: 5786908 (1998-07-01), Liang
“Example 1”, http://uranus.ee.auth.grlessons/1/examples/example1.html, 2 pp. visited Jun. 18, 1999.
“Example 2”, http://uranus.ee.auth.gr/lessons/1/examples/example2.html, 2 pp., visited Jul. 8, 1999.
P. Hung, “Colorimetric Calibration for Scanners and Media”, Camera and Input Scanner Systems, SPIE, vol. 1448, pp. 164-174, 1991.
P. Hung, “Color Rendition Using Three-Dimensional Interpolation”, Imaging Applications in the Work World, SPIE, vol. 900, pp. 111-115, 1988.
“Newton-Raphson Method using derivatives”, http://uranus.ee.auth.gr/lessons/1.5/html, 2 pp., visited Jun. 18, 1999.

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