THE COMPONENT DEVELOPMENT OF DIGITAL CLOSE RANGE
PHOTOGRAMMETRY FOR THE CONSTRUCTION STRUCTURE DISPLACEMENT ANALYSIS
Sangho BAE, Korea
Key words: DCRP, Segmentation, Ellipse Fitting,
Displacement.
Abstract
The 3D measurement method using digital images is expected to be
applied widely in displacement measurement and monitoring area for the
safety of various construction structure by automatization of data
acquisition and process and developing real time digital image
analysis with high accuracy.
The possibility of Digital Photogrammetry to be referred to as
Vision Metrology is being increased by making the synthetic,
systematic foundation of image analysis.
In this study, image analysis routine was designed with object
oriented concept to increase the efficiency of displacement analysis
of construction by the digital image analysis.
For the hierarchical connection management of analysis routine, the
object inheritance of photogrammetry was made by making classes such
as target management, coordinate transformation of scan image, bundle
adjustment and direct linear transformation. And sub-pixel coordinate
measurement was performed efficiently by producing additional function
module, such as target recognition, grouping, image segmentation,
image coordinate measurement routine including location measurement,
the size decision of sub-pixel and recognized target indication.
Analysed errors of sub-pixel coordinate measurement, the image
segmentation (T-3) method using the value of mean and standard
deviation in search window, and the ellipse fitting(EL1) method by the
edge detection and the edge thinning could be produced for the
development of digital photogrammetry components enabling the
high-accuracy sub-pixel measurement, and it was known that the
measurement accuracy was increased according to the increase of
threshold values.
As the result of this study, the displacement measurement of
structures could be done more efficiently by developing components of
classes designed with the subject of image analysis process by object
oriented concept. The displacement measurement of a sham bridge and
the relocation measurement of an auto-control robot were done for the
test of this.
Hereafter, if a lot of studies on practical use of digital
photogrammetry are performed, the possibility of it's application is
expected to be enlarged as a means of displacement measurement in
various industry including civil engineering.
CONTACT
Sangho Bae
Full Time Lecturer, Civil Eng.
Daelim College
526-7 Bisan Dong
Dongan Gu
Anyang
KOREA
Tel. + 82 31 467 4912
Fax + 82 31 467 4910
E-mail: shbae@daelim.ac.kr
23 March 2001
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