Patent ID: 7834900

Claim:
A method for correcting banding defects in a photoreceptor image forming apparatus, the method comprising: forming one or more images using one or more laser beams; checking the one or more images for one or more sets of image imperfections arising from an electric field attenuation in the photoreceptor; compensating for the electric field attenuation; wherein the compensating comprises generating a power distribution profile for the one or more laser beams, and modulating power to one or more laser beams based on the power distribution profile; and forming a compensated desired image, wherein the one or more sets of image imperfections is a set of luminance errors at location i of the luminance value ΔL i *, and wherein a laser beam j of the one or more laser beams is modulated to alter an exposure of the laser beam by Δp j , where Δp j is estimated by minimizing the formula ∑ i ⁢ ( Δ ⁢ ⁢ X i - Δ ⁢ ⁢ X i * ) 2 where Δ ⁢ ⁢ X i = Δ ⁢ ⁢ L i * S ⁡ ( X ) where Δ ⁢ ⁢ X i * = ∑ j = 1 N b ⁢ β ij ⁢ Δ ⁢ ⁢ p j ; and where: S(X) is a slope of a luminance to exposure intensity curve at exposure X, β ij is an exposure contribution for laser beam j at location i, and N b is the total number of laser beams.