System and method for automatically detecting edges of scanned documents
First Claim
Patent Images
1. A method for detecting an edge of a document being scanned, comprising:
- (a) scanning a portion of the document against a substantially light reflecting backing to obtain a first set of image data;
(b) scanning a portion of the document against a substantially light absorbing backing to obtain a second set of image data;
(c) calculating a set of first values from the first set of image data, each one of the first values being a first-order statistic;
(d) calculating a set of second values from the second set of image data, each one of the second values being a first-order statistic; and
(e) determining a detected edge of the document from the set of first values and the set of second values.
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Abstract
A method for identifying document edges collects a predetermined number scanlines of the document against a light backing and a dark backing. First-order statistics are calculated from the scanned data. A document edge is detected using the first-order statistics.
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Citations
17 Claims
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1. A method for detecting an edge of a document being scanned, comprising:
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(a) scanning a portion of the document against a substantially light reflecting backing to obtain a first set of image data;
(b) scanning a portion of the document against a substantially light absorbing backing to obtain a second set of image data;
(c) calculating a set of first values from the first set of image data, each one of the first values being a first-order statistic;
(d) calculating a set of second values from the second set of image data, each one of the second values being a first-order statistic; and
(e) determining a detected edge of the document from the set of first values and the set of second values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17)
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14. A method for detecting an edge of a document being scanned, comprising:
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(a) scanning a portion of the document against a substantially light reflecting backing to obtain a first set of image data;
(b) scanning a portion of the document against a substantially light absorbing backing to obtain a second set of image data;
(c) calculating a set of first values from the first set of image data, each one of the first values being a first-order statistic;
(d) calculating a set of second values from the second set of image data, each one of the second values being a first-order statistic;
(e) calculating a set of third values from the second set of image data, each one of the third values being a second-order statistic;
(f) calculating a set of fourth values from the second set of image data, each one of the fourth values being a fourth-order statistic;
(g) determining a first edge detection from the set of first values and the set of second values;
(h) determining a second edge detection from the set of first values and the set of second values;
(i) determining a third edge detection from the set of first values, the set of second values and the set of fourth values; and
(k) reconciling the first edge detection, the second edge detection and the third edge detection to obtain a document edge.
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Specification