Method for determining scan line misalignments

Details Method for determining scan line misalignments Method for determining scan line misalignments

2006-05-11

2010-06-01

Safaipour, Houshang (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S474000, C358S486000, C358S494000, C358S001900, C358S406000, C358S409000, C382S291000, C382S287000, C250S208100, C348S241000, C348S372000

Reissue Patent

active

RE041364

ABSTRACT:
A test image has a black bias on a white background. The black bias is a line set at about 45 degrees to the scan lines of a scanner. Boundary points of the scanned bias are found. A regression line is calculated from the positions of the boundary points. Differences in the positions of adjacent boundary points, together with the slope reciprocal of the regression line, are used to determine error values. The error values are compared with a gate value to determine if there are any occurrences of scan line misalignment.

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