Phytec eGrabber-4plus, Hardware Manual

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eGrabber-4plus
56 
PHYTEC Meßtechnik GmbH 2004 L-608e_4
Figure 29: Comb Effect That Occurs with Quick Moving Objects
The parameter described above can be changed in the demo program.
With vertical resolutions lower than 288 rows, it is easier to digitize a
field. The field1 (first, odd half frame) and field2 (second, even half
frame) buttons can be used to manipulate the digitization of half
frames.
If the number of rows is larger than 288, then both fields must be
digitized. To digitize both fields, click on full frame. If a number
larger than 288 is entered into Image Resolution, then the full frame is
automatically selected.
The field aligned button doubles the number of displayed fields per
second. This eliminates the 20 ms pause between the digitization of
fields.
Optically frames, the image contents shifts a half line up and down,
when consecutively displaying both fields.
This occurs because the two fields cannot be interlaced to form a full
frame. When configuring field aligned, the Grabber automatically
moves the second field one half row, so that the second field can
properly interlace with the first field, creating a frame.
This does not allow the jump effect to occur. This configuration for
field aligned is also helpful when the user wishes to consecutively
digitize images with a maximum of 288 rows, at a rapid pace (1 field
in aprox. 20 ms).