Controlling image capture
STINGRAY Technical Manual
V4.4.2
190
Controlling image capture
Shutter modes
The cameras support the SHUTTER_MODES specified in IIDC V1.31. For all
models this shutter is a
global pipelined shutter
; meaning that all pixels are
exposed to the light at the same moment and for the same time span.
Pipelined
Pipelined means that the shutter for a new image can already happen, while
the preceding image is transmitted.
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.
Software trigger
Stingray cameras know also a trigger initiated by software (status and control
register
or in SmartView by
Trig/IO
tab,
Stop trigger
button).
Camera I/O
The external trigger is fed as a TTL signal through
Pin 4
of the camera
I/O connector.
Trigger modi
Stingray cameras support IIDC conforming Trigger_Mode_0 and
Trigger_Mode_1 and special Trigger_Mode_15 (bulk trigger).
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 59: Trigger modi