Patent ID: 8351079
Filing Date: 2013-01-08
Classification: G03G,H04N

Abstract:
1. A method for estimating a banding profile in an image printing system comprising at least one marking engine, the at least one marking engine comprising a charging device for charging the image bearing surface, an exposing device for irradiating and discharging the image bearing surface to form a latent image, and a developer unit for developing toner onto the image bearing surface, the method comprising: obtaining image data across multiple measurement intervals by a sensor; combining the image data with timing information into a coherent signal by a processor; determining aperiodic components of the coherent signal by the processor; and determining the periodic component of the coherent signal using spline interpolation, wherein the periodic component represents a banding profile, by the processor; and printing an output print with a correction applied based on the banding profile.