32 
2. CAMERA SPECIFICATIONS 
The Rollei ChipPack has been concipated as a digital back for the well known Rollei middle format cameras (Fig. 1). Interchanging 
the film magazine and the ChipPack, the analogoues camera becomes a digital camera and vice versa. All standard components, 
especially the lenses, can be used with the ChipPack. Inside the ChipPack a CCD-sensor from Loral/Fairchild with 2048 x 2048 
sensor elements is used. Tab. 1 shows some technical data of the recording system. 
  
sensor resolution Sensor size pixel size exposure time transfer time 
  
  
Loral/Fairchild 2048x2048 pixels 31mm x 31mm 15pm x 15pm 1/1000 - 2sec 3 sec 
  
  
  
  
  
  
  
  
Tab. 1: Technical data of the ChipPack 
The ChipPack is available as color and black/white version. At the color version three images with the whole resolution are taken, 
using different filters. The black and white version, originally concipated for measuring purposes, is equipped without any filter. The 
camera is controlled by a SCSI-box, which is responsible for the camera control and the temporary storage of image data. This 
conception has a lot of advantages: 
- The camera can be used with different computer systems. 
- The recording system is fully controllable by the computer. This includes the image recording and the setup of important camera 
parameters like exposure time and aperture. This is important especially for industrial applications with cameras mounted at 
inaccessible recording stations. 
- With one SCSI controller up to seven cameras can be controlled. So it is possible to work simultaneously with a lot of cameras 
without any special hardware. All cameras connected to a controller can do the exposure within 1/10 of a second. Fig. 2 shows the 
principle of a multi-camera configuration. | 
- The transfer of image data is done via the SCSI interface, too. This allows a fast transfer of the data to the host computer. 
- Image data are aquired with a radiometric resolution of 12bit and are transformed to 8bit data. Depending on the application during 
the transformation any kind of gradation table can be programmed. 
- It is possible to work with areas of interest. This allowes the transfer of a smaller amount of data, if only a part of the image is 
important for the current measurement. 
- The camera is delivered with a library for the SCSI- interface. So the camera control can be integrated very easily in different kind 
of user defined software. 
  
   
  
    
PC/AT with 
standard 
SCSI-controller 
  
SCSI-Box 1 SCSI-Box 2 | SCSI-Box 3 
Camera 2 | Camera 3 
    
Fig. 2: Multi- camera configuration 
IAPRS, Vol. 30, Part 5W1, ISPRS Intercommission Workshop “From Pixels to Sequences”, Zurich, March 22-24 1995 
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