Scion Frame Grabbers
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I
have a Scion CG-7 frame grabber and my live image is not in
color. What could be wrong?
You need to make sure that you have 'Capture Color Images'
selected in the 'Video Control' dialogue box. Also, make
sure that your display is set to thousands (16 bit) or
millions (24 bit) of colors.
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Why is my color image green?
Some RGB cameras come from the factory with the sync signal
set to the green channel. The frame grabber needs to have
the sync signal on channel four. Having it set to the green
channel will make the color image overly green. Refer to
your camera manual to see how to turn the sync on green off.
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Why do I see a cross-hatched interference pattern in the
captured image?
You are probably trying to capture grayscale images from a
color (NTSC or PAL) camera. Scion frame grabbers are
designed to capture images from an RS-170 (or CCIR) video
source. RS-170 (CCIR) is grayscale video. Color video has
color information modulated on the grayscale portion of the
video signal. This color information causes the distortion
pattern in the captured image.
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I
am trying to do a color capture in the Scion Image program.
I have an RGB camera connected to the Scion frame grabber
with the four source cable, but I seem to be having
difficulty getting the frame grabber to sync to the camera.
What could be causing this?
You need to have the 'Separate Sync' box selected in the
'Video Control' dialog box. This dialog box is found under
the 'Special' menu. 'Separate Sync' tells the frame grabber
to look for sync information on channel four of the four
source cable.
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How can I capture grayscale images from an RGB camera?
There are two methods for capturing grayscale images from an
RGB camera. The first is to simply capture from the green
signal (source 2 in the 'Video Control' dialog box). The
green signal contains the majority of the grayscale
information of a color image. The second method is to use
Image's 'Capture Color' command. After the three color
slices are captured, choose the 'RGB to 8 Bit Color' command
with the existing palette option selected. If you were
currently working with a grayscale look-up table, then the
resulting image will be the correct grayscale image.
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Why is my captured image from a VCR jumpy?
Some consumer quality VCRs and camcorders exhibit large
time-base errors in the video signal. Scion frame grabbers
do not perform time-base correction on the incoming video
signal. In this case a time-base corrector is needed between
the VCR and the frame grabber board. Some VCR models have
time-base correctors built into the unit, they will be
labeled time base correction circuitry or full frame
buffering.
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Why am I having trouble doing a 'Print Video' on the VG-5 or
CG-7?
The VG-5 and the CG-7 do not have the ability to generate
their own sync signal. A camera must be connected and turned
on so the frame grabber can get a steady sync signal to
perform the 'Print Video'.
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I
have an integrating camera that can be controlled in the
Scion Image program. Why is the image grainy after doing an
integrate on-chip?
Make sure that the camera's Automatic Grain Control (AGC) is
off or turned to manual. When the AGC is on, a noisy image
can be produced because the gain is set so high. When you
integrate the image you create an even noisier image.
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