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Title
Proceedings, XXth congress

hul 2004
O
L30



3 PERFORMANCE EVALUATION BY OUTDOOR
EXPERIMENT
In order to evaluate more practical accuracy, experiment was
performed at outdoor using following 4 card size digital
cameras and armature digital camera (CP-900Z). 17 targets
were set on the test field which shown in figure 8. Circled 9
points were used for camera calibration, and other 8 points were
used as check points. 3D coordinates of each target are
measured by the total station (Accuracy of distance is Imm,
accuracy of angle is 2” ), and image coordinate were given
as center of area gravity by image processing procedures.
Stereo images were taken 5 times using the 5 cameras so that
base-height ration (0.34) might become the same condition
(distance from the center of camera to test field (H:23.617m),
and base line(B:8.029m)).

Figure 8 Test field
Table 3 R.M.S.E for the check points
Model 1 | Model 3 |Theoretical value
(mm) (mm) (mm)
a xy 2.3908 | 5.2041 2.2884
Oz 9.6100 | 8.3887 0.7258
MA a xy 6.0880 | 4.1435 2.8505
DMAGC X Oz 7.7025 | 8.8318 8.3848
a xy 6.7182 | 3.7829 2.8212


Product Name Accuracy


CP-900Z








Optes Oz: | 95808 | 75772 | 390i
oxy | 35554 | 33958 | 30289
ys Oz | 86083 | 74982 | 83091
EX Oxy | 7.7963 | 29354 | 2.8265
Oz 8.1479 | 10.1759 8.9297







e (ER ©
"i 11 KR
Where, H: altitude, f: focal length, B: base line
2 ,.pointing accuracy
Table3 shows R.M.S.E for 8 check points. Model 1 means the
results which were corrected by radial polynomial 3rd degrees
distortion model, model 3 means by radial and tangential model,
theoretical values means computed values using Eqs. (1) as
pointing accuracy for each camera was assumed 0.3 pixel.
It may be said from this results that lens distortion for the card
size digital cameras can be improved by radial and tangential
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B-YF. Istanbul 2004
distortion model as well as experiment on the above-mentioned,
in particular XY accuracy is considerably improved by model 3.
The accuracy for the card size digital cameras which were
corrected by Modl 3 showed almost same accuracy compare
with CP-900Z which were corrected by model 1. Furthermore,
the accuracy for the card size digital cameras which were
corrected by Modl 3 showed almost same accuracy compare
with theoretical accuracy.
Consequently, it can be concluded that card size digital cameras
are ushering in photogrammetric fields as an essential tool,
which have ability to promise convenient photogrammetry
4 CONCLUSIONS
Performance evaluation of the card size digital cameras for
digital photogrammetry were investigated. XY accuracy is
considerably improved by radial and tangential distortion model
(model 3), and lens distortion for the card size digital cameras
can be improved by model 3. Nevertheless lens distortion for
armature digital camera with more than 3 mega pixels can be
improved by radial polynomial 3rd degree distortion model as
usual.
On the other hand, from the results of the relationship with
accuracy and pixel numbers, it can be seen that accuracy for the
card size digital cameras which were corrected by model 3
shows almost same value with high resolution armature digital
cameras with more than 3 mega pixels and professional digital
cameras with 6 mega pixels
Furthermore, the accuracy for the card size digital cameras
which were corrected by Model 3 showed almost same
accuracy compare with CP-900Z which were corrected by
model 1 and with theoretical accuracy.
Consequently, it is expected that card size digital cameras are
popularly used in photogrammetric fields as a essential tool
which have ability to progress convenient photogrammetry.
Reference from Other Literature:
Y. KUNII and H. CHIKATSU, 2001, On the Application of 3
Million Consumer Pixel Camera to Digital Photogrammetry,
Proceedings of SPIE (Videometrics VII), Vol.4309, pp.278-287
H. CHIKATSU and Y. KUNII, 2002, Performance Evaluation
of Recent High Resolution Amateur Cameras and Application
to Modeling of Historical Structure, International Archives of
Photogrammetry and Remote Sensing, Vol.XXXIV, Part5,
pp.337-341, Corfu
R. NAKADA and H. CHIKATSU, 2003, Generating 3D Model
of "Meguro Residence" using Digital Armature Camera,
International Archives of Photogrammetry and Remote Sensing
(CD-Rom), Vol.XXXIV-5/W10, ISSN 1682-1777, Vulpera
Fryer J. G. and Brown D.C., 1986, Lens Distortion for Close-
Range Photogrammetry, Photogrammetric Engineering and
Remote Sensing, Vol.52, No.1, pp. 51-58.