Patent ID: 8542410

Claim:
A method for estimating an exposure modulation 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 to the image bearing surface, the method comprising: determining, using a processor, a banding profile for an image printing system at different area coverages of a Tone Reproduction Curve (TRC), wherein the procedure of determining the banding profile further comprises: obtaining image data across multiple measurement intervals for each area coverage by one or more sensors, combining the image data with timing information into a coherent signal, and analyzing the coherent signal for periodic and aperiodic components for each area coverage, wherein the periodic components represent the banding profile; determining, using the processor, an adjusted exposure modulation profile based on the determined banding profile using a least squares estimation; and printing an output based on the adjusted exposure modulation profile, wherein the adjusted exposure modulation profile is configured to provide an optimal banding correction across all the area coverages of the TRC.