Patent ID: 7492485
Filing Date: 2009-02-17
Classification: G03G

Abstract:
1. 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 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.