User`s manual

STOC USER’S MANUAL ©2005 VIDERE DESIGN
motion blur. Indoors, the gain is usually set higher because of the
lower light levels.
• Adjust the manual iris of the lens to as small an opening as
possible for your application, without having to use gain. This
will increase the depth of field and give better optical performance.
Indoors, the iris usually is fully open. Outdoors, in bright
conditions, the iris can be partially closed.
There are automatic modes for both exposure and gain. In auto mode, gain
and exposure are controlled by the imager, which samples the incoming
image and sends changes the exposure and gain parameters. The auto
algorithm will try to reduce gain as much as possible, while still
maintaining overall light levels in the image.
Auto mode for gain and exposure can be set separately. For the STOC, if
there is relatively slow motion, it is recommended to use a manual mode for
gain, and auto mode for exposure. Indoors, set the gain to a higher value;
outdoors, set it to a low value. With exposure in auto mode, the light on the
image will be adjusted by changing the exposure.
For high-speed motion, it is better to set the exposure to a fixed, low value,
and then use auto-gain to keep reasonable light levels on the imager.
7.5 Subsampling
The STOC device does not perform subsampling operations. All images
are transmitted at a resolution of 640x480.
7.6 Frame Rates
Frame rates from the STOC/-C depend on the frame size. Table 6 shows the
frame rates available for each of the frame sizes. Note that a 50 Hz option
is available – see Section
3.3
7.7 Firmware Parameters
There is one firmware parameter that affects the overall behavior of the
STOC.
• 50 Hz operation
This parameter can be changed by using the Firmware Parameter dialog,
which is only available from the smallvcal menubar. Choosing this
menu brings up the dialog, which is shown in
Figure 7-3.
The dialog lists many of the internal parameters of the device, which are
fixed in the firmware. The one changeable parameter is for 50 Hz or 60 Hz
operation (Section
3.3).
The Firmware Parameter dialog is only available after the STOC has been
opened by pulling down the Video item of the Input chooser. To use 50
Hz operation, check the box, and then press the Save button. This choice
is downloaded and stored in the device, and will cause 50 Hz operation
every time the STOC is accessed. To change back to 60 Hz, uncheck the
box and again save it to the device.
It is also possible to clear any calibration parameters that are saved on the
STOC firmware. If the calibration parameters are present, the Clear
Calibration button will be activated. Pressing this button will clear the
parameters. See the SVS Users’ Manual for information on saving and
loading calibration parameters on the device.
Resolution Frame Bin on
imager
Bin on
PC
Frames per Second
640 x 480 Full no no 7.5, 15, 30
Table 6 Frame rates for the STOC.
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