Phytec eGrabber-4plus, Hardware Manual

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eGrabber-4plus
112 
PHYTEC Meßtechnik GmbH 2004 L-608e_4
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De-/Activation of the Interlaced Mode
void Set_Interlace(WORD nDevNo, WORD nInterlace);
nInterlace: 0 = Non-Interlace
1 = Interlace
2 = Field Aligned
This function indicates to the Grabber, that the incoming videosignal
is an interlaced or none interlaced signal. This will influence the
vertical scaling filter. For a whole frame the option Interlace and for a
field the option Non-Interlace should be selected in order to reduce
artifacts from the motion.
When displaying only fields, a 20 ms recess usually occurs between
the two digitization events. This is because the other field cannot be
displayed due to the field rastering delay. In the Field Aligned mode,
the second field is internally moved over by a half row, so that the
frame can fit onto the first field. This method allows a field to be
returned in a 20 ms rhythm.
Because the field is altered during the electronic filtering, this function
is only suitable in a range limited for measuring and automation tasks.