ALLIED Vision Technologies Oscar F-810 - Manual (Page 57)

Description of the data path
OSCAR Technical Manual V2.4.0
57
Frame readout implications
Frame readout has implications when shooting moving or stationary objects.
To compensate for this condition, two different shutter modes have been
introduced.
The so-called split shutter opens and closes the shutter per field. This mode
is suitable for shooting stationary objects only.
Split shutter can be used with continuous light or strobe light because the
camera outputs the IntEna signal accurately per field (this means that in the
case of an Oscar F-810C, a strobe would flash three times per image).
The so-called joint shutter opens the shutter for both fields concurrently.
When the first field is shifted into the shift register its integration ends, but
the integration of the second (or third) field continues until the previous
field(s) has(ve) been completely shifted out.
Consequently the shutter time can only be controlled for the first field; the
other field(s) always have an additional shutter time equivalent to the read-
out time of the first field.
Figure 24: Split shutter
Note
L
Using this mode with moving objects introduces red/blue
artefacts with the Oscar F-320C and Oscar F-510C, and jagged
artefacts with the Oscar F-810C.
Shutter first
field
Output first field
Output second field
Shutter
second field