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Controlling image capture
OSCAR Technical Manual V2.4.0
100
Controlling image capture
Shutter modes The cameras support the SHUTTER_MODES specified in IIDC V1.3. For all mod-
els this shutter is a global (field) shutter; meaning that all pixels (in the
same field) are exposed to the light at the same moment and for the same
time span.
Continuous mode In continuous modes the shutter is opened shortly before the vertical reset
happens, thus acting in a frame-synchronous way.
External trigger Combined with an external trigger, it becomes asynchronous in the sense
that it occurs whenever the external trigger occurs. Individual images are
recorded when an external trigger impulse is present. This ensures that even
fast moving objects can be grabbed with no image lag and with minimal
image blur.
Camera I/O The external trigger is fed as a TTL signal through Pin 4 of the camera
I/O connector.
Trigger modi
Oscar cameras support IIDC conforming Trigger_Mode_0 and Trigger_Mode_1
(in progressive modes only) and special Trigger_Mode_15 (bulk trigger).
Edge mode (Trigger_Mode_0)
Trigger_Mode_0 sets the shutter time according to the value set in the shut-
ter (or extended shutter) register.
Trigger mode also known as Description
Trigger_Mode_0 Edge mode Sets the shutter time according to the value set in
the shutter (or extended shutter) register
Trigger_Mode_1 Level mode 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)
Trigger_Mode_15 Programmable mode Is a bulk trigger, combining one external trigger
event with continuous or one-shot or multi-shot
internal trigger
Table 30: Trigger modi