era in a computer 
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. cases the offered 
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a functions driven by 
Software 
rent ways to get the 
computer. First of all 
out of the camera and 
way is to connect the 
nputer and let dImage 
i. Another interesting 
a digital camera. With 
there is established a 
ter. Afterwards you're 
amera offers. There is 
ze of functions to the 
/hile using the remote 
le to interchange any 
ol the camera settings 
umbnail. If the camera 
« dimage manages to 
amera. The graphical 
| shown on the monitor 
anipulation. 
2.2 Image manipulation 
DImage offers some basic functions for the manipulation 
of graphical files. The focal point is an optimisation of 
the raw data material and a concise concept of storing 
and finding data files. Storing a group of digital images 
in a virtual photo album offers the advantage of a clear 
storage management. For image manipulation and 
optimisation of graphical raw data material dImage 
supports the following functionality : 
alignment 
gamma-correction 
brightness & contrast 
histogram 
image definition 
cropping image parts 
Because some of these functions implicate a falsification 
of the raw data material they are not suitable to images, 
which are intended for photogrammetric use. 
3. PHOTOGRAMMETRIC NETWORK 
CONCEPTS 
Multi image photogrammetry is based on a triangulation 
concept. Camera stations, corresponding points and 
control points represent a network configuration that has 
to be calculated in a bundle adjustment procedure. In 
case of a static object, photographs can be taken with one 
camera from different positions accepting time delays 
between the exposures. In case of a dynamic object, the 
photographs must be taken with several cameras 
simultaneously. 
Industrial measurements or deformation analysis often 
require measurements which have to be repeated from 
time to time. A fixed camera set-up with remote 
controlled equipment is appropriate to solve such tasks. 
Cameras are permanently mounted on motor driven 
tripod heads in the production environment. Every 
camera can be remote controlled by its URL from any 
client connected to the Web at any time. It has to be 
mentioned, that comparison to Web cams will show 
much more sophisticated problems in photogrammetric 
applications. These can be for example the amount of 
image data or online algorithms for evaluation or event 
handling. Photogrammetric surveillance systems are 
another important field for digital photogrammetry and 
remote controlled camera configurations. 
4. IMPLEMENTATION OF A REMOTE 
CONTROL ENVIRONMENT 
Currently RolleiMetric follows up new concepts of 
realising a remote control of digital metric cameras. 
Previous solutions couldn't bridge a bigger distance than 
about 5 meters. The new development doesn't know a 
limitation in distances any more. A worldwide remote 
> 
control of digital Rollei cameras is realised. The 
application DNetControl provides operating a camera via 
a local area network or based on the TCPIP-protocol via 
Internet. 
A second new development of RolleiMetric is the 
software developer kid *RDCSDK". It provides an easy 
and elegant way to embed the full range of functionality 
of a remote control to external applications. 
4.1 Software design of DNetControl 
It's the first time an application provides the possibility 
to bridge bigger distances in order to control a digital 
camera. The full functionality of a digital metric camera 
is available either via an SCSI- or any kind of network - 
connection. DNetControl enables the user to operate a 
camera in a local area network or the World Wide Web. 
As the SCSI-solution is limited to a distance of about 5 
meters a remote control based on TCPIP just depends on 
the ability of an Internet connection. So there's no 
restriction of distance any more. 
To use DNetControl in a network you have to connect 
the camera to a computer via SCSI. Is this *camera 
system" known with its IP-address any other connected 
computers have full access to the camera by using 
DNetControl. The *client system" starts the connection 
and tells it's own IP-address to the camera system. So the 
foundations for a bi-directional communication are laid. 
If the user requires a service by clicking on any button on 
the graphical user interface the client system informs the 
camera system about the request. Afterwards the camera 
systems send its commands to the camera, and after 
getting an answer it submits the result back to the client 
system. 
The following chart exemplifies the communication 
between client, server and the camera : 
  
Clientrechner Serverrechner 
x. 
1 
| 
1 
1 
| 
1 
1 
1 
1 
= 
S5 
=, 
SLT 
— 
Send command 
api Send command 
„get focus 
1 
1 
I 
| 
I 
! 
1 
1 
1 
1 
1 
| 
! 
| 
I 
| 
! get focus“ 
1 
! —— 
| 
1 
1 
I | 
I 
i Send date 
+ = 
1 focus" 
1 
1 
1 
| 
! 
I 
1 
MI T 
Send date 
„focus“ 
| 
Show date 
„focus“ 
Figure 3: Example of network communication 
The application DNetControl supports any necessary 
operations to control a camera in a network. On one hand 
all needed operations for the communication between 
server and client and on the other hand the whole 
functionality to control the camera is implemented. It’s