Parallel non-iterative method of determining and correcting...

Details Parallel non-iterative method of determining and correcting... Parallel non-iterative method of determining and correcting...

2006-01-10

2006-01-10

Shah, Sanjiv (Department: 2625)

Image analysis

Image transformation or preprocessing

Measuring image properties

C382S282000, C382S284000, C358S538000, C358S540000

Reexamination Certificate

active

06985640

ABSTRACT:
A method of determining image skew in a scanned document includes scanning the image and determining on a pixel-by-pixel basis whether or not pixels are ON or OFF on scan lines and columns along both the fast and slow scan directions for a particular document rotation angle. Through one read of the image, image data is sampled simultaneously at a plurality of predetermined document rotation angles From the sampled data, the second order moment of the number of ON pixels is calculated as a function of document rotation angle for scan lines along both the fast and slow scan directions, yielding two independent skew angle estimates Skew angle estimates corresponding to valid second order moment data sets are compared and combined to provide a resultant skew angle estimate for the document.

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“Measuring Document Image Skew and Orientation.” Bloomberg et al.SPIE Symposium in Document Recognition II, 1995.

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