SVS-Vistek EC02 Series, Руководство пользователя, Страница: 50 / 131

SVS-VISTEK
Feature-Set 50
Figure 48: Figure of an unbalanced 2 tap image
7.2.4 Tap Reconstruction
The data coming from the camera have to be reconstructed to the
original image data structure. This task is done either by the frame
grabber hardware (Camera Link, CXP) or the driver software (GigE, USB).
The process is transparent, so it doesn’t matter whether the physical
interface is serial or parallel.
7.2.5 Tap Balancing
In sensors with multiple the tap structure, parts of the picture may appear
differently. Taps may display difference in dynamics and brightness.
To eliminate these differences,
tap balancing offers gain
adjustments separately for each
tap.
This is due to the requirement
for a dual or quad -ADC circuit
to handle the simultaneous
digitization of the two or more
channels of analog signal
coming from the CCD. The
fact that the separate analog
output channels not being
perfectly linear and the
separate output amplifiers
having physically different
slopes leads to the necessity to
sometimes manually or
automatically adjust the gain
levels of each channel
independently to obtain a
homogenous image.
Automatic Tap Balancing
Automatic Tap Balancing analyses a narrow strip at the border of the
taps. It adjusts the gain value to the average brightness value of these
strips.
Continuously Tap Balancing
Automatic Tap Balancing can be done continuously. Taps will be
balanced from one image to the next.
Tap Balancing once
When performing Tap Balancing once. Only one specific image will be
analyzed. The gain-correction values will be saved and applied to
subsequent images.
Manual Tap Balancing
Tap Balancing can be performed manually