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CLC number: TP391.72

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Received: 2009-04-17

Revision Accepted: 2009-08-17

Crosschecked: 2009-08-31

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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.10 P.1450~1460

http://doi.org/10.1631/jzus.A0920214


A code-based approach for labeling in complex irregular regions


Author(s):  Zhi-long LI, Jun-jie CAO, Xiu-ping LIU, Zhi-xun SU

Affiliation(s):  School of Mathematical Sciences, Dalian University of Technology, Dalian 116024, China

Corresponding email(s):   zhilongli@gmail.com, xpliu@comgi.com

Key Words:  Labeling, Freeman codes, Region filling, Optimal direction, Shipbuilding


Zhi-long LI, Jun-jie CAO, Xiu-ping LIU, Zhi-xun SU. A code-based approach for labeling in complex irregular regions[J]. Journal of Zhejiang University Science A, 2009, 10(10): 1450~1460.

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author="Zhi-long LI, Jun-jie CAO, Xiu-ping LIU, Zhi-xun SU",
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year="2009",
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%A Xiu-ping LIU
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%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0920214

TY - JOUR
T1 - A code-based approach for labeling in complex irregular regions
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A1 - Jun-jie CAO
A1 - Xiu-ping LIU
A1 - Zhi-xun SU
J0 - Journal of Zhejiang University Science A
VL - 10
IS - 10
SP - 1450
EP - 1460
%@ 1673-565X
Y1 - 2009
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0920214


Abstract: 
labeling information in a complex irregular region is a useful procedure occurring frequently in sheet metal and the furniture industry which will be beneficial in parts management. A fast code-based labeler (FCBL) is proposed to accomplish this objective in this paper. The region is first discretized, and then encoded by the Freeman encoding technique for providing the 2D regional information by 1D codes with redundancies omitted. We enhance the encoding scheme to make it more suitable for our complex problem. Based on the codes, searching algorithms are designed and can be extended with customized constraints. In addition, by introducing a smart optimal direction estimation, the labeling speed and accuracy of FCBL are significantly improved. Experiments with a large range of real data gained from industrial factories demonstrate the stability and millisecond-level speed of FCBL. The proposed method has been integrated into a shipbuilding CAD system, and plays a very important role in ship parts labeling process.

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