Method for smooth trap suppression of small graphical objects using run length encoded data
AssigneeXerox Corporation
InventorJon S. McElvain
Life of this patent
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Abstract
A method for smooth trapping of an object containing run length encoded image pixel data, includes collecting a number of scanlines of run length encoded pixel data equal to 2M in a buffer, wherein M is a line width trap threshold; determining those runs within the collected scanlines that require trapping, wherein a run is a portion of a scanline; if trapping is required in the fast scan direction and the length of the run requiring trapping is less than M, reducing the width of the trap region by a prorated percent. If trapping is required in the slow scan direction, and the number of runs above and below the run to be trapped is less than M, reducing the number of runs above and below the run to be trapped by a prorated percentage.
Claims7
A method for smooth trapping of an object containing run length encoded image pixel data, comprising:
- collecting a number of scanlines of run length encoded pixel data equal to 2M in a buffer, wherein M is a line width trap threshold;
- determining those runs within the collected scanlines that require trapping, wherein a run is a portion of a scanline;
- determining if a run requiring trapping is located in a fast scan direction or a slow scan direction;
- if trapping is required in the fast scan direction, determining the length of the run requiring trapping;
- if the length of the run requiring trapping is less than M, reducing the width of the trap region according to a predetermined relationship;
- and
- applying a trap correction to the trap pixel according to the reduced trap region width.
Dependencies are inferred from the claim text.