Sigma LBA-400 Manuel D’Utilisation

3.2.3.7  Pixel Scale, Pixel Units 

For analog cameras that use the Genlock sync source, only the V..ertical Pixel Scale is set.  

The pixel scale value is derived from your camera’s detector specifications, or is user 

programmable to match the characteristics of your optical system.  For the camera imager based 

scale setting, the value to enter is the minimum line pitch of the camera’s detector. 
For Interline and Full Frame transfer type cameras, the line pitch is the vertical element pitch 

of the CCD detector.  For pseudo-interlaced Frame transfer type cameras the line pitch is ½ the 

vertical element pitch.  Check your camera specifications to accurately determine the correct 

value to enter here.  This value is not always as obvious as it may seem. 
 

 

 

Figure 16 

           
The H..orizontal Pixel Scale setting is only used with Digital output style cameras.  For digital 

cameras the data is clocked by the camera’s element rate clock, and its focal plane array 

determines the horizontal pixel scale.  In this case you must enter a value that is the horizontal 

pixel pitch of the camera. 
Choose the Pixel Units that applies to your pixel scale value.  Camera detector pixel pitch is 

specified in micro-meters (µm), and all provided .cam files are specified in µm. 

 

3.2.3.8 Gamma 

Correction 

If your camera employs a solid state CCD or MOS style detector, then your camera’s detector 

responds linearly to monochromatic light.  For linearly responding cameras the Gamma setting 

should be set to 1. 
If you are using a vidicon tube style camera, or a phosphor coated imager, then your output 

response is less likely to be linear, and you may need to enter a Gamma correction number that 

matches the gamma of your camera.  Note: Correction is performed on the entered gamma value 

so enter the gamma value of the camera response, not the inverse gamma correction factor.  

Operator’s Manual 

 

LBA-PC 

 

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