Method for trapping raster data in a run-length encoded form

Details Method for trapping raster data in a run-length encoded form Method for trapping raster data in a run-length encoded form

2005-01-18

2005-01-18

Wallerson, Mark (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001150, C358S518000, C382S167000

Reexamination Certificate

active

06844942

ABSTRACT:
A method of correction for toner misregistration in color printing systems, specifically for run length encoded image data. This method, called “trapping”, usually involves extending the color separations one or more pixels to overlay the edge. The color of the “trap zone” is chosen such that it is nearly imperceptible in the presence of the two initial colors. Our approach assumes the existence of a “trap generator”, which provides a trap color given two input colors.In run length encoded image format, the image is comprised of an array of “scanlines”, consisting of a string of “runs” that are specified by a minimum position in the fast (horizontal) direction, a length, and a color. We describe a method of trapping involving the following steps: 1) inspecting the run lengths in each scanline to determine the color edges of the image; 2) sending the colors at the boundaries to the trap generator to determine the trap color; and 3) modifying the intersecting runs with the trap color. The result is an efficient elimination of the edge defects at color boundaries, which is enabled by the run length encoded image format.

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U.S. Appl. No. 09/409,541, filed Sep. 29, 1999, David E. Rumph.

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