Patent ID: 7492485

Claim:
A method for correcting a defect in an image by compensating for the defect, the method comprising: inputting a test image to an image path actuator; inputting an output of the image path actuator to a marking engine; creating a test output image; measuring test data on the test output image; inputting the test measurement data obtained from the test output image to a controller; storing previously printed images in an image buffer; inputting the previously printed images from the image buffer to the controller; inputting the current image to the controller; outputting an image correction factor from the controller based on the test measurement data, the previously printed images, and the current image to the image path actuator; and creating a corrected image based on the image correction factor output from the controller to the image path actuator, wherein the step of outputting an image correction factor includes implementing the formula Δ ⁢ ⁢ t in = - g ⁡ ( t in , s in ) ∂ ERC ∂ t in + ∂ g ∂ t in , wherein Δt in is the correction factor, t in is an input gray level, s in is a ghost source input gray level, ERC is an engine response curve, and g is the magnitude of the ghost defect.