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EP1184808A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for detection of skew angle and border of document images in a production scanning environment

Assignee: Eastman Kodak Co
•
Filing: 2001-08-17
•
Granted: —
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Expires: 2021-08-17
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Abstract

Abstract A method for detection of a skew angle and a border of a document scanned by a production scanner comprise the steps of: (a) detecting a page start signal; (b) capturing an image line; (c) checking for an end of page signal; (d) if an end of page signal is detected go to step (h), if no end of page signal is detected go to step (e); (e) detecting image edge pixels; (f) performing a single pass connected contour pixel component analysis; (g) go to step (b); (h) collecting the connected contour pixel components; (i) selecting a largest component; and (j) analyzing the largest component to obtain the skew angle and border of the document.

Inventors

  • 👤 Yongchun Lee
  • 👤 Peter Rudak

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 13:27
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/387; H04N1/3877; H04N1/3878; G; G06; G06T; G06T7/00; G06T7/70; G06T7/73; G06V; G06V30/00; G06V30/10; G06V30/14; G06V30/146; G06V30/1475; G06V30/1478

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 116 words
A method for detection of a skew angle and a border of a document scanned by a production scanner comprising the steps of: (a) detecting a page start signal; (b) capturing an image line; (c) checking for an end of page signal; (d) if said end of page signal is detected go to step (h), if no end of page signal is detected go to step (e); (e) detecting image edge pixels; (f) performing a single pass connected contour pixel component analysis; (g) go to step (b); (h) collecting said connected contour pixel components; (i) selecting a largest component; and (j) analyzing said largest component to obtain said skew angle and said border of said document.
Claim 2
Dependent Claim 41 words
A method as in claim 1 wherein said step of detecting image edge pixels is comprised of: computing an image intensity gradient in a 3x3 moving window; and thresholding said intensity gradient data to extract an edge bitmap of image objects.
Claim 3
Dependent Claim 46 words
A method as in claim 1 wherein said step of performing said single pass connected contour pixel component analysis is comprised of: extracting said image edge pixels in a moving 3x3 local window by means of look up table method and a sequence of template commands.
Claim 4
Dependent Claim 32 words
A method as in claim 1 wherein said skew angle is obtained by: detecting an orientation of said largest contour component; and calculating a skew angle based on said largest contour orientation.

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