pciGrabber-4x4
52
PHYTEC Messtechnik GmbH 2008 L-720e_0
Figure 28: Comb Effect That Occurs with Quick Moving Objects
The parameter described above can be changed in the demo program.
With vertical resolutions smaller 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 half frames
per second. This eliminates the 20 ms pause between the digitization
of half frames.
Optically frames, the image contents shifts a half line up and down,
when consecutively displaying both half frames.
This occurs because the two half frames cannot be interlaced to form
a full frame. When configuring
field aligned
, the Grabber
automatically moves the second half frame one half row, so that the
second half frame can properly interlace with the first half frame,
creating a full 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).
If the horizontal resolution is smaller than 360 Pixel the checkmark
came Lowpass should be set.
