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The instructions to control the motion platform
are supplied by the serial board of the
computing unit. Image capture and line camera
motion are synchronized by the ‘Timing-
Generator’ [Ebben, 1992], which is also a part of
the computing unit.
(c) Computing unit
The two main tasks of this unit are the control of
the overall system and image storage. These
are managed by the central processing unit
which currently is a Pentium 90 processor.
The "Timing-Generator, responsible for
synchronization and support of the linear CCD-
array with the necessary timing signals, is
designed as a PC-interface board. The analog
data signals, sequentially read out from the
CCD-line, are converted to the corresponding
digital words by the ADC PC-interface board.
Thus, every pixel is represented as a 24-bit
digital value (8-bit per color) which is stored in
the standard PPM-format on the disk for further
processing. During the recording time the image
captured is shown on a 17“ color monitor.
(d) Supply unit
This unit supports the scanning, motion and
computing unit with electrical power.
scanning unit computing unit
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256 color
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POWER: 36V, BV, +/-12V
Figure 3: Block diagram of the indoor room imaging
system
A picture of our implemented experimental
recording platform is shown in figure 4.
5 RESULTS
This paper presents a status report of a project to
build an automated indoor imaging and modeling
system. We introduced a new electronic imaging
system. The innovation of this system is the line
sensor of high geometric resolution and the image
57
acquisition by rotating this sensor. The costs of a
line sensor are quite low in relation to an area
sensor offering the same geometric resolution.
Further more, line sensors with up to 8000 pixels
are commercially available.
Our experimental electronic imaging system is
functional and initial experiments have begun to
scan indoor scenes across an angle of 360° with
high geometric resolution. Of course, given proper
focoussing, we can generate panoramic images of
outdoor scenes as well. Figure 5 represents two
180° indoor sweeps from different recording
locations. No geometric nor radiometric corrections
were applied to these electronic images. One
problem is the camera focusing when the object
distance varies in a wide range. This can be seen in
figure 5.
Figure 4: Experimental recording platform for indoor
room image acquisition
6 FURTHER PLANS AND OUTLOOK
Intrinsic and extrinsic parameters of the imaging
system must be calibrated, resulting in
investigations of the accuracy of this imaging
system. The next step is then to create algorithms
to reconstruct the geometry of indoor scenes. This
will be accomplished using knowledge about
straight lines, planes, perpendicular angles etc. and
using stereo images. Finally the geometry of
models will be augmented by photographic textures
to support a computerized virtual environment.
7 ACKNOWLEDGEMENT
Financial support for this project was provided by
Osterreichische Nationalbank
(Jubiläumsfondsprojekt Nr: 4871). Technical
support by Dr. C. Jorde of Vexcel Imaging GmbH is
gratefully acknowledged.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996
