Improving color calibration accuracy by reiterative mapping

摘要

A color image reproduction system is able to reproduce high-fidelity replicas of original color images by using a color calibration transformation that is obtained by reiteratively deriving refined mapping functions. In one aspect of the invention, an initial reverse transformation is derived that by itself provides poor-quality calibration for a device that is characterized by a forward mapping transformation. One or more second reverse transformations are derived reiteratively for composites of the forward transformation and all reverse transformations derived thus far. A high-accuracy calibration transformation is obtained by combining the all of the derived reverse transformations. In a second aspect of the invention, an initial calibration transformation is derived that by itself provides poor-quality calibration for a device that is characterized by a forward transformation. A refined calibration transformation is derived by reiteratively applying calibration transformations to selected points in a color space to determine the relationship between the selected points and the corresponding points mapped by the forward transformation. <IMAGE>