Phytec FireWire-CAM-011H, Руководство пользователя

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The Camera in Detail
© PHYTEC Messtechnik GmbH 2006 L-680e_1
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3.4.2.2 Camera Settings - Properties
The dialog
Properties
gives you access to all basic parameters that
can be used to set the function blocks of the camera described in the
introduction.
For additional information refer to section 3.6, „How to Maximize
Image Quality”.
Shutter/Exposer
(DCAM): sets the exposure time.
This parameter can be set manually or automatically (along with the
amplification
Gain
;
see below
). Technically this parameter is based on
an internal feedback loop. This loop takes 4048 gray level samples
from the picture and calculates a average brightness level from them.
Gain and shutter influence the picture in a similar manner. A reduction
in the gain can be compensated by an increase in the shutter and vice
versa. There are therefore many combinations of gain and shutter that
will result in an identical picture.
The gain, however, is the electrical amplification of the image signal,
while the shutter influences the exposure
time
.
A higher gain value will result in a noisy image. For this reason the
gain should not be set unnecessarily high.
On the other hand, longer exposure times may result in motion blur
and other picture distortions.
Practically, a balance between the two settings is preferable.
If satisfactory image quality cannot be achieved, a brighter light
source may be required.
The dialog
Auto Exposure/Gain
gives you access to all parameters
that determine the behavior of the regulation loop in automatic mode
of Shutter/Gain.
With that you can influence the behavior of the automatic exposure
regulation and adjust it to your exposure situation.
You can find further information in
section 3.6, „How to Maximize
Image Quality”.