Appendix 3: VDRPARAMS.INI File, Rev. 1.2
VDR-100G3/G3S Installation Manual 18/01/2009
6
A3.6 Video Parameters
Parameter Typical
Value
Remarks
numSources 1 1 to 4; default is 2
transferRate 15000 1 video=15000; 2=7500; 3=5000; 4=3750
blocks 4 Number of capture intervals per file.
This number should be equal to
60000ms/transferRate
maxColors 256 Maximum number of colours in output image
enhancedCompression 0 1=enable; 0=disable; default is 0
noiseClipping 0 1=enable; default is 1; ignored if
enhancedCompression is disabled
recordDuringPowerFail 0 To record Video during a power fail, set to 1;
default is 0
Table A3- 6 - Video Parameters
The video capture module captures a 24-bit image, converts it to an 8-bit image and compresses
it. The capture and conversion components can be configured depending on the data source.
The number of sources connected to the VDR-100G3 is read from the INI file – the numSources
field. Up to four sources are supported. The capture interval is also read from the INI file – the
transferRate field. The capture interval for each input channel is equal to numSources *
transferRate (if two sources are present and the transferRate is 7.5 seconds, each channel will be
sampled every 15 seconds).
The conversion of the captured image from 24 to 8 bits has several settings that affect the
process. Normally the conversion will generate a palette with 256 entries. This typically results in
an image that compresses least. If the source has less than 256 colours, the number of colours
generated by the conversion routine can also be limited.
In some instances even greater compression can be achieved by setting the
enhancedCompression field in the INI file. This feature will pre-process the data prior to
conversion, resulting in fewer colours. If the image is labelled RADAR format (which is the
default, unless an external indicator is provided), the number of output colours is restricted to 64;
otherwise it is 256.
If the captured image has a primarily black background, any noise at the low end of the captured
signal can be removed by setting the noiseClipping field in the INI field. This setting must be
used with care, as it may set most of the image to black if there is no noise near the black level.
This setting is only used if enhanced compression is enabled.
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