SOME SPECIAL CASES OF CLOSE RANGE PHOTOGRAMMETRY APPLICATION
Dusan Joksié, Milos Vojinovié
Institute of Geodesy, Faculty of Civil Engineering, University of Belgrade
Bulevar revolucije 73, 11000 Belgrade, Yugoslavia
Commission V, Working Group 2
KEY WORDS: Close_Range, Non-metric, Photography, Video
ABSTRACT:
Photo and video cameras have become irreplaceable in a modem man’s life. Millions of these cameras register all important
events that happen. From the photogrammetric point of view these are non-metric cameras. Utilization of photos made by
these cameras for measurement pupooses can be invaluable in many situations. This has been subject of interest at the
Laboratory for Photogrammetry , Institute of Geodesy , Faculty of Civil Engineering Belgrade , since 1987. An experiment and
three characteristic examples of photography made by non-metric cameras are presented in the paper.
INTRODUCTION
In various circumstances, a Irage number of photos is made
by using ordinary photo camera, without previously planned
taking of photographies. On the other side, the standard
application of closerange photogrammetry usually
assumes:
- utilization of the professional photogrammetric
equipment which provides that difference between
projection at the moment of film exposure and central
projection is as small as possible, and
- calculation of the photography disposition which is
going to provide the required accuracy for final results,
considering the selected equipment and field
conditions.
Introduction of analytical photogrammetric methods
enabled the needs of a large number of users who do not
use standard photogrammetric methods to be satisfied
(Wong 1975, Kager 1976, Fraser 1982). This also enabled
utilization of photos made by non-metric cameras for
measurement purposes (Waldhaeusl, 1988).
Possession of adequate software and interesting problems
that appeared in practice had enabled investigations in this
field at the Laboratory for Photogrammetry since 1987. The
paper presents a brief overview of few selected experiments
and projects where one or both of the above mentioned
conditions were not satisfied.
EXPERIMENT
In 1987, Laboratory for Photogrammetry at the Faculty of
Civil Engineering in Belgrade and Crime Investigation
Service of the Belgrade Police Department have carried out
a specially prepared experiment (Mihajlovi¢ et al, 1994). A
traffic accident was simulated at the street crossing (Figure
1). The aim of the experiment was to confirm possibilities of
utilization of non-metric photos for traffic accident
274
investigation. It should be an alternative method of
investigation in cases where the standard photogrammetric
procedure failed for any reason, or it could not provide all
the necessary information. The traffic scene accident was
registered using the following methods:
1. precise geodetic surveying (electrooptical tacheometer
Carl Zeiss EOT 2000),
2. standard photogrammetric procedure (camera Wild
C120, autograph Wild A40),
3. photography using non-metric cameras (Mamia
6x6cm, Yashica 6x6cm, Practica 24x36mm, Minolta
24x36mm i Mamia 24x36mm).
Precise surveying measurements were carried out to serve
as control measurements, since they provide considerably
higher accuracy of object coordinates then
photogrammetric methods. Using precise tacheometry, the
positions of 100 object points were determined from
specialy developed geodetic network. The same points
were measured on photos made by non-metric cameras
and by the Wild photogrammetric camera. Photo
measurements were carried out on monocomparator, and
the data were processed using software packages BINGO
and FotoSoft. The photos were processed in series, where
one series included all photos made by one camera and
with the same photo material.
Coordinates for object points from five independent series,
acquired by photography using different types of non-metric
cameras, different format and different photo material, have
been compared with the results of the geodetic survey and
shown in Table 1. General information on data adjustments,
important for drawing conclusions, have been presented in
the same table. The results and conclusions were
encouraging. Only those which concem the achieved
accuracy will be herby emphasized:
1. All camera types, regardless of format and photo
material, provide the required accuracy. For the realised
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996
expe
axis.
2. The
accul
3. Rege
meas
consi
the :
elimir
Table 1
compare
Came
Filn
Form
MAM
black &
60x60 |
YASHI
colot
60x60 |
PRACT
black&v
60x60 |
MINOI
black&v
24x36 |
MAM
colot
24x36 |
At the €
(Mihajlovi
same sce
to measu
MR2 syst
photo me
made ph
extension
questions
1. /s
(Whic
meas
2 7o
partic
6006
mein
2/5 8
proce
Proce
In additioi
the followi
1. The |
photc
expla
meas
meas
accur
not p
plann
