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Patent Searching and Data


Title:
METHOD OF FLATTENING LASER-BASED IMAGE OF CURVED BOOK PAGE
Document Type and Number:
WIPO Patent Application WO/2017/185407
Kind Code:
A1
Abstract:
A method of flattening a laser-based image of a curved book page is applicable to an image acquisition device and a laser generation device in a scanning platform or fixed at a scanning platform. The method comprises the following steps: opening a book on a horizontally arranged scanning platform, and emitting to a book page a laser beam, the laser beam forming a horizontal laser line on the curved book page; acquiring a flat image of the curved book page having thereon the horizontal laser line, and acquiring a 2D planar coordinate (x, y) of each pixel on the laser line in the flat image; computing, according a y-coordinate in the 2D planar coordinate, a y-coordinate of an intersection of the laser beam and the scanning platform, and an angle at the intersection of the laser beam and the scanning platform, and by means of a tangent function, a height of each pixel on the laser line, or an actual spatial height; computing actual spatial heights of all pixels on each laser line, or z coordinates, to obtain a 3D spatial curve of the laser line; constructing, using the curve, an actual 3D curved surface of the acquired book page; and flattening the 3D curved surface after pixel transformation to complete flattening of the book page.

Inventors:
ZHOU KANG (CN)
Application Number:
PCT/CN2016/081571
Publication Date:
November 02, 2017
Filing Date:
May 10, 2016
Export Citation:
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Assignee:
DALIAN CZUR TECH CO LTD (CN)
International Classes:
H04N1/00
Foreign References:
CN101033953A2007-09-12
Other References:
ZHANG, ZHENG ET AL.: "Restoration of Curved Document Images through 3D Shape Modeling", PROCEEDINGS OF THE 2004 IEEE COMPUTER SOCIETY CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION (CVPR, 04, vol. 1, 31 December 2004 (2004-12-31), pages 10 - 15, XP010708982
ZHANG, ZHENG ET AL.: "CORRECTING DOCUMENT IMAGE WARPING BASED ON REGRESSION OF CURVED TEXT LINES", PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON DOCUMENT ANALYSIS AND RECOGNITION (ICDAR, 03, 31 December 2003 (2003-12-31), pages 589 - 594, XP010656830
Attorney, Agent or Firm:
DALIAN EAST PATENT AGENT LTD. (CN)
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