Patent ID: 7125094
Filing Date: 2006-10-24
Classification: G06K,H04N

Abstract:
1. A method for compensating for streak defects in an image formed using an image forming device that forms the image on a receiving material that is translated through the image forming device along a process direction, comprising: printing a compensation pattern usable to determine a difference in gray level between an actual gray level value and an intended gray level value at a cross-process-direction image-forming device pixel location in the image, comprising: scanning the compensation pattern to generate a set of scanned image data, the scanned image data defining an image value for each of a plurality of cross-process direction scanned image pixel locations; analyzing the scanned image data based on the cross-process direction scanned image pixel locations of the marks of the first and second sets of alignment marks to determine at least one actual gray level value for at least one of the plurality of gray level portions for at least one cross-process-direction image-forming device pixel location; generating, for each analyzed cross-process-direction image-forming device pixel location, for each analyzed gray level portion of that analyzed cross-process-direction image-forming device pixel location, a compensation parameter based on the determined actual gray level value for that analyzed gray level portion and the intended gray level value for that analyzed gray level portion, wherein: printing the first set of alignment marks adjacent to the first end of the plurality of gray level portions comprises printing a plurality of rows of marks extending along the cross-process-direction such that the marks of each row are offset from the marks of other ones of the plurality of rows of the first set and, for each row, each mark of that row is spaced apart from adjacent marks of that row by a number of cross-process-direction image-forming device pixel locations at least equal to the number of the plurality of rows of the first set; and printing the second set of alignment marks adjacent to the second end of the plurality of gray level portions comprises printing a plurality of rows of marks extending along the cross-process-direction such that the marks of each row are offset from the marks of other ones of the plurality of rows of the second set and, for each row, each mark of that row is spaced apart from adjacent marks of that row by a number of cross-process-direction image-forming device pixel locations at least equal to the number of the plurality of rows of the second set.