Patent ID: 8565628
Filing Date: 2013-10-22
Classification: G03G

Abstract:
1. A method of compensating for non-uniformity in an electrophotographic printer, comprising: providing the electrophotographic printer with a rotatable imaging component having an intentional periodic variation; forming a test patch by depositing toner on a test surface using the rotatable imaging component, the test patch having a length; measuring the respective densities of a plurality of points along the length of the test patch using a density sensor; using a processor to automatically detect, using the measured densities, respective angular positions of the intentional periodic variation in the test patch and respective amounts of an unintentional periodic variation in the test patch at one or more of the plurality of points; using the processor to automatically produce a non-uniformity map that relates the detected angular positions with the detected amounts at one or more of the plurality of points receiving an image signal representing a print image to be deposited on a receiver by the printer, the image signal including a plurality of regions arranged around the rotatable imaging component; rotating the rotatable imaging component and, for each successive region in the image signal: