Title:
METHOD AND APPARATUS FOR DETECTING AND/OR ASSESSING THREE-DIMENSIONAL ELEVATED STRUCTURES ON A SURFACE OF A DOCUMENT
Document Type and Number:
WIPO Patent Application WO/2012/038321
Kind Code:
A3
Abstract:
The invention relates to an apparatus (1) and to a method for detecting three-dimensional elevated structures (2) on a surface (3) of a document (4). The method comprises the steps of: illuminating the surface (3) with light; capturing an image of the surface (3) during the illumination of the surface (3), and evaluating the captured image to ascertain the elevated structures (2), wherein the surface (3) is illuminated areally in at least two different ways and at least one areal image (71, 81) of the surface (3) is captured for each of the different illumination ways and the plurality of areal images (71, 81) of the surface (3) thus captured are evaluated together.
Inventors:
KRAMER THOMAS (DE)
KRAMER RALF STEFAN (DE)
GROTEHUSMANN ULF (DE)
RICHTER WERNER (DE)
RACKL CHRISTIAN (DE)
KRAMER RALF STEFAN (DE)
GROTEHUSMANN ULF (DE)
RICHTER WERNER (DE)
RACKL CHRISTIAN (DE)
Application Number:
PCT/EP2011/066023
Publication Date:
September 07, 2012
Filing Date:
September 15, 2011
Export Citation:
Assignee:
BUNDESDRUCKEREI GMBH (DE)
KRAMER THOMAS (DE)
KRAMER RALF STEFAN (DE)
GROTEHUSMANN ULF (DE)
RICHTER WERNER (DE)
RACKL CHRISTIAN (DE)
KRAMER THOMAS (DE)
KRAMER RALF STEFAN (DE)
GROTEHUSMANN ULF (DE)
RICHTER WERNER (DE)
RACKL CHRISTIAN (DE)
International Classes:
G06V10/145
Other References:
HENTZSCHEL T W ET AL: "An optical reading system for embossed braille characters using a twin shadows approach", JOURNAL OF MICROCOMPUTER APPLICATIONS, ACADEMIC PRESS, vol. 18, no. 4, 1 October 1995 (1995-10-01), pages 341 - 354, XP004914607, ISSN: 0745-7138, DOI: 10.1016/S0745-7138(05)80034-X
Attorney, Agent or Firm:
OBST, Bernhard (Potsdamer Platz 10, Berlin, DE)
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