Allied Vision Technologies F-131B, Technical Manual, Page: 91 / 183

Controlling image capture
9 Controlling image capture
The cameras support the SHUTTER_MODES specified in IIDC V1.3. For all models this shutter is a
continuous modes the shutter is opened shortly before the vertical reset happens, thus acting
ombined with an external trigger, it becomes asynchronous in the sense that it occurs whenever
recorded when an external trigger impulse is
ensu st m an be g d with
minimal image blur.
The external trigger is fed as a TTL signal through Pin 4 of the HiRose conn
Normally a rolling curtain shutter is used to
orten the expos e or integration ti curtain’s widt fines the d
curtain sweeps with the frame readout time over the image. Although this is appropriate for
ill images, image istortion will be c moving ob us part
scanned earlier than the lower image part. Fo
nly. A side effect of global sh n or shutter time is added to the
readout time, thus affecting the frame rates to be achieved.
and special
igger_Mode_0 sets the shutter time according to the value set in the shutter (or extended
utter) register. Trigger_Mode_1 sets the shutter time according to the active low time of the
pulse applied (or active high time in the case of an inverting input).
global shutter; meaning that all pixels are exposed to the light at the same moment and for the
same time span.
In
in a frame-synchronous way.
C
the external trigger occurs. Individual images are
present. This
res that even fa oving objects c rabbe no image lag and with
ector.
For CMOS sensors, a global shutter is not common.
sh
ur me. The h de integration time an
the
st
d reated with
r this reason the MF-131 features global shutter
jects, beca e the upper image
is
o
utter is that the integratio
9.1 Trigger modi
The cameras support IIDC conforming Trigger_Mode_0 and Trigger_Mode_1
Trigger_Mode_15.
Tr
sh
Figure 54: Trigger_mode_0 and 1
MARLIN Technical Manual
Page 91