Patent Document ID: 8314978
Application ID: 12356897
Patent Status: 1

Claim One:
1. A model-based, halftone independent method for characterizing a printer equipped with a plurality of halftone screens, comprising a static offline step and a dynamic online step, where the offline step includes: at reference time t 0 , printing a target set of color patches where the patches are halftone independent colorant overlap patterns and that each colorant assumes only values from a binary set, measuring the target of patches using a spectral measurement device; deriving a multi-color binary printer model of multiple color channels using said measurements; obtaining a predicted printer response for a given color halftone screen based on the said multi-color binary printer model; comparing a true measured response of the printer using the halftone screen with the predicted response to derive a correction factor corresponding to the halftone screen such that the correction factor maps the said predicted response to the true measured response including an accounting of colorant interactions; and the dynamic online step comprising at any time t n : printing a target set of color patches where the patches are colorant overlap patterns wherein each colorant assumes only values from a binary set; measuring the said target of patches using a spectral measurement device; deriving a binary printer model using said measurements; obtaining a multi-color predicted printer response for a given color halftone screen based on the said binary printer model; and applying the correction factor obtained in the said offline step to the said multi-color predicted printer response to obtain an estimate of a true printer response including an accounting of colorant interactions.