admitted.
/stem for
sing the
1 a small
testfield
which 35
otwork of
roximately
posed by
3ustafson,
Accuracy
2.05 mm.
roximately
and image
-reflective
8 mm on
Ye centre (
nts). The
t camera
onvergent
sonic CCD
cale was
e average
to 2.4 m.
he targets
regard to
a images
for single
ng bundle
d exterior
jarameters
ipal point,
meters for
tangential
ned. Next,
onvergent
tion of all
oordinates
! common
signalized
y, on the
y in image
space corresponds to 0.5 of the pixel spacing. The
resulting standard deviations of the points of the
testfield after bundle adjustment lied in the range of 0.2
mm which is equivalent to a relative accuracy of
1:3000 in object space. Considering the applied
method of pixel coordinates measurement and the
functional model enhanced in small degree for
additional parameters, the obtained results can be
accepted as sufficient.
5. FINAL REMARKS
The digital system for close range photogrammetric
applications presented in this paper is in testing phase
now. The test comprise optimisation of conditions of
digital images sequences performing, studies of effects
of certain filtering methods and contrast correction on
measurement accuracy in the pixel coordinate system.
In current form, the system can be used for off-line 3D
data acquisition in the process of monitoring of non-
topographic objects in close range ,in such cases when
immediate extraction of information on the studied
object is not needed. The current architecture of the
system, i.e. its first stage of development, limits the
speed and accuracy of digital processing. The first,
experimental tests gave sufficient results of three
dimensional points determination, especially when the
simplified procedure of elaboration is regarded.
In the nearest future, the system will be developed in
the following directions :
e to apply automatic procedures of structural object
recognition on images, and automatic measurement
of pixel coordinates,
e to enhance the functional model of bundle method
with further, additional system calibration
parameters.
On the basis of gained experience, we perform
construction of video-thermal system (multi-media-
sensor system) within independent research project. In
this system, a new generation frame grabber board will
be coupled with AGEMA-880 infrared camera together
with CCD multicameras photogrammetric digital
System. Video-thermal system, in which all the sensors
will work parallel will designated for multi-purpose
industrial monitoring.
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