Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-06-07
1997-07-15
Evans, Arthur G.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358518, 358504, G06K 1500, G03F 308, H04N 146
Patent
active
056490720
ABSTRACT:
A color correction table (10) is generated which converts colorimetric RGB locations into device RGB color space. The conversions are determined based on a printer response of a printer (12) by inputting a set of device RGB values to be printed. The printer (12) prints a corresponding set of RGB color patches. A measuring device (14) measures each color patch and determines a colorimetric RGB location for each color patch. A transformer (16) determines a transformation for each colorimetric RGB location and its corresponding device RGB value which are then stored in the RGB locations of the color correction table (10). The table (10) is then refined by inputting the originally measured colorimetric RGB locations to the table (10) and recovering table device RGB values. A comparator (18) compares the table device RGB values with the originally printed device RGB values and determines a residual error for each colorimetric RGB location. An interpolator (18) interpolates the found residual errors to the other RGB locations of the color correction table based on a weighted sum of the found residual errors and a Euclidean distance between the RGB locations. A refining means (22) refines each of the table device RGB values with the interpolated residual errors. The refinement steps are then repeated until the residual errors are within a selected tolerance.
REFERENCES:
patent: 4500919 (1985-02-01), Schreiber
patent: 5065234 (1991-11-01), Hung et al.
patent: 5107332 (1992-04-01), Chan
patent: 5491568 (1996-02-01), Wan
patent: 5528386 (1996-06-01), Rolleston et al.
patent: 5539522 (1996-07-01), Yoshida
Evans Arthur G.
Legree Tracy M.
Xerox Corporation
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