Multipass image scans for increased measurement resolution...

Details Multipass image scans for increased measurement resolution... Multipass image scans for increased measurement resolution...

2008-08-04

2011-10-11

Williams, Kimberly A (Department: 2625)

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

C358S504000, C358S505000, C399S072000

Reexamination Certificate

active

08035863

ABSTRACT:
Systems and methods are described that facilitate calibrating a print engine using calibration data sets generated at at least two different L* levels to provide additional calibration measurement resolution toward the darker end of the grayscale spectrum. For instance a first, light grey (e.g., 70-90L*) calibration strip is scanned at a first resolution (e.g., 70-90L*) to generate a first calibration data set, and a second darker grey (e.g., 30-50L*) calibration strip is scanned at high resolution (e.g., 100L*) to generate a second calibration data set. The first calibration data set is used to calibrate the print engine for high L* values (e.g., 50-100) and the second calibration data set is used to calibrate the print engine for low L* values (e.g., 0-50). Alternatively, a single calibration strip having a known L* value can be scanned once at the known L* value and again at a higher L* value (e.g., 100L*) to generate two calibration data sets, which are used to improve calibration resolution in the darker part of the spectrum.

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