Patent Number: 6,166,758

Title: Led uniformity correction with improved uniformity distribution in a desired range of grey levels

Abstract: A method is disclosed for calibrating a grey level recording printhead having a plurality of recording elements. The method comprises measuring a parameter of each recording element, the parameter relating to a recording characteristic of the element, in response to measuring the parameter, defining a set of cells of clock periods having time boundaries to determine a set of K quantized clock periods; defining a subset of one or plural contiguous grey values within a set of J grey values recordable by the printhead for recalculation of a subset k of quantized clock periods wherein the number k of quantized clock periods is less than the number K, and recalculating at least some time period boundaries and clock periods for the grey levels j without changing the K total number of K clock periods.

Inventors: Ajewole; Isaac I. (Rochester, NY)

Assignee: Eastman Kodak Company

International Classification: G06K 15/12 (20060101); H04N 1/401 (20060101); B41J 002/47 ()

Expiration Date: 12/26/2013