Halftone independent correction of spatial non-uniformities

Details Halftone independent correction of spatial non-uniformities Halftone independent correction of spatial non-uniformities

2007-07-26

2011-12-06

Poon, King (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003010, C358S003020, C358S003090, C358S003100, C358S003110, C358S003260, C358S003270, C358S003300, C358S501000, C358S504000, C358S505000, C358S518000, C358S534000, C358S536000

Reexamination Certificate

active

08072648

ABSTRACT:
The predicted tone response curve for each color channel and halftone is predicted using a binary printer model and stored, wherein the “predicted tone response curve” provides a model based approximation of the actual response for the printer for each addressable pixel location in the spatial range. Also stored is an “average predicted tone response” by averaging the “predicted tone response curve” over the spatial range of the printer. With the “true average” tone response curve, the “predicted tone response curve”, and the “average predicted tone response curve”, an estimate of the true tone response curve for the color channel can then be mathematically obtained, wherein the true tone response curve defines a predicted actual response for the printer for each addressable print location in the spatial range. The “predicted” and “average” tone response curves are obtained using the 2×2 binary printer model.

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