[Measured Results]
EN
Measurement Error RMS ( mm)
X Y Z
Case À 0.531 0.389 0.987
Case B 0.711 0.706 0.996
3.6. Example of 3D Measurement (Superimposition)
By using IMS orientation, example of 3D plotting
of our office is as shown below:
Fig.8 Photograph on the Left
Used in the Measurement
Fig.9 Example of the Measured Data,
superimposed on the left Image
by Using the Line Command
4. CONCLUSION
Our concepts on the configuration of a practical
system for close-range photogrammetry are
described below:
(D Easy operating devices for photography and
orientation processing
© Automatic measuring system based on the
extraction of features (edge) on the object
© Development of on-line plotting by using the
3D CAD system wire frame models
@ Direct image input by using high resolution
CCD camera
Our experimented orientation by the IMS was
processed to obtain orientation angles by
collimating a specified reference point by using
transits. Originally this orientation, however,
is a method of determing exterior orientation
parameters just observing the angle of
collimating direction directly and its purpose
is to establish a most fundamental problem © in
close-range photogrammetry.
In this experiment, many observation discrepancy
were seen owing to the target sizes which were
big, but the measuring accuracy was almost
reached to the theoretical values that allows us
to say this method is near the practical level.
Furthermpore, algorism to obtain the exterior
orientation parameters has been confirmed.
For the future, after finding methods of
improving the adapter's stability and its
calibration, we plan to establish a
configuration that is more accurate and simple
measurement for a base line of cameras than the
IMS (for example, a high accurate total station)
and develop a high resolution CCD camera system.
REFERENCES:
(19) Hattori, S., S. Murai, R. Shibasaki, He
Ohtani, 1989 "A Semi-Automatic Terrain
Measurement System for Earthwork "Control",
Photogrammetric Engineering and Remote
Sensing, Vol. 55, No.5, pp. 373-579,
(2) Hattori, Se, S. Murai, R. Shibasaki, He.
Ohtani, 1988 ISPRS Kyoto. "Stereo Matching
Project in Japan", Commission No.2, pp,
149-159.
(3) Manual of Photogrammetry. 1980, fourth
Edition, ASP
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