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Title:
METHOD, SYSTEM, AND PROGRAM FOR MEASURING GRAIN SIZE OF DEPOSITED GRANULAR MATERIAL
Document Type and Number:
Japanese Patent JP2014095644
Kind Code:
A
Abstract:

To provide a method and system capable of measuring, without a scale, grain sizes of individual granular materials in a deposit.

Stereo images GR and GL of a deposit 1 in which granular materials 2 having different grain sizes are stacked are captured; an outline 2p of each granular material 2 is extracted from both of the images GR and GL by outline extraction means 22; a plurality of corresponding points on the outlines 2p are detected by coordinate calculation means 23; three-dimensional coordinates are calculated from two-dimensional coordinates of respective corresponding points T by a stereo image method; and grain sizes d of the granular materials 2 are measured from a plurality of three-dimensional coordinates on the outlines 2p by grain size measurement means 26. Preferably, representative corresponding points C and inscribed radii Rp within outlines 2p are detected instead of the corresponding points T on the outlines 2p by the coordinate calculation means 23; three-dimensional coordinates and subject distances L are calculated from the two-dimensional coordinates of the respective representative points C by the stereo image method; and the grain sizes d of the granular materials 2 are measured by the grain size measurement means 26 from the subject distances L of the representative corresponding points C in the outlines 2p, the inscribed radii Rp of the outlines 2p, and a focal length f of an imaging device 30.


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Inventors:
YOKOTA YASUHIRO
AKOSHIMA MANABU
DATE KENSUKE
TAKAHASHI HIRONOBU
MIZUGUCHI YUJI
Application Number:
JP2012247964A
Publication Date:
May 22, 2014
Filing Date:
November 11, 2012
Export Citation:
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Assignee:
KAJIMA CORP
APPLIED VISION SYSTEMS CORP
International Classes:
G01N15/02
Domestic Patent References:
JP2009036533A2009-02-19
JP2000304511A2000-11-02
JP2009276073A2009-11-26
JPH08101035A1996-04-16
JP2012047613A2012-03-08
JP2003035527A2003-02-07
JP2010249553A2010-11-04
JP2002099902A2002-04-05
JP2009036533A2009-02-19
JP2000304511A2000-11-02
JP2009276073A2009-11-26
JPH08101035A1996-04-16
JP2012047613A2012-03-08
JP2003035527A2003-02-07
Attorney, Agent or Firm:
Atsushi Ichito
Reijiro Ichihigashi



 
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