Method of calibrating a scanner to a printer
AssigneeLexmark International, Inc.
InventorsYao Han, Xuan-Chao Huang, Brant Dennis Nystrom, Richard Lee Reel
Life of this patent
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Abstract
An electronic representation of the range of color combinations that can be displayed on the monitor is created and printed. The printed representation is then scanned by the scanner. A relationship is then identified between the monitor and the scanner. This relationship is then used as the basis to determine a relationship between the scanner and the monitor. Compensation is made for errors and the relationship is further developed. Finally, a scanner RGB to printer CMYK lookup table is built.
Claims9
A method of calibrating a scanner in a system having a printer, a monitor, a CPU and a monitor-to-scanner lookup table, the calibration method comprising the steps of:
- (a) creating an electronic representation corresponding to a range of color combinations of Red, Green and Blue, said range being consistent with a monitor color combination range of said monitor;
- (b) printing a printer image on said printer using said monitor-to-printer lookup table;
- (c) scanning said printer image with said scanner to create a scanner image;
- (d) creating a monitor-to-scanner relationship by relating said electronic representation to said scanner image;
- (e) creating a scanner-to-monitor relationship using said monitor-to-scanner relationship;
- (f) creating a scanner-to-printer relationship using said scanner-to-monitor relationship and said monitor-to-printer relationship, and
- (g) storing said scanner-to-printer relationship.
A computer program, on a computer usable medium for calibrating a scanner to a printer, the program comprising:
- means for creating an electronic representation of a range of color combinations;
- means for printing a printer image of said electronic representation using a pre-existing monitor-to-printer relationship;
- means for scanning said printer image to create a scanner image;
- means for creating a monitor-to-scanner relationship using said electronic representation and said scanner image;
- means for computing a scanner-to-monitor relationship;
- means for creating a scanner-to-printer relationship for correlating a scanner point to a corresponding printer point;
- and
- means for storing said scanner-to-printer relationship.
A method of calibrating a scanner in a system having a printer, monitor, and a monitor-to-printer relationship, the method comprising the steps of:
- (a) computing a scanner-to-monitor relationship for relating a scanner color space to a monitor color space, comprising:
- (1) selecting a plurality of points in a scanner color space;
- (2) associating said scanner color space points with a plurality of points in a monitor color space;
- (3) adjusting said plurality of monitor color space points using tri-linear interpolation;
- (4) adjusting said plurality of scanner color space points using tri-linear interpolation;
- and
- (5) adjusting said plurality of scanner color space points by error compensation;
- (b) creating a scanner-to-printer lookup table for relating a printer point to an identified scanner point;
- and
- (c) storing said scanner-to-printer lookup table for use by said system to create an accurate copy of a scanned image on said printer.
Dependencies are inferred from the claim text.