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Controlling image capture
GUPPY Technical Manual V4.0.1
123
Controlling image capture
Global shutter
The cameras support the SHUTTER_MODES specified in IIDC V1.3. For all mod-
els this shutter is a
global shutter ; meaning that all pixels are exposed to
the light at the same moment and for the same time span.
In continuous modes the shutter is opened shortly before the vertical reset
happens, thus acting in a frame-synchronous way.
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.
The external trigger comes in as a TTL signal through Pin 4 of the camera
I/O connector.
Pipelined global shutter
The CMOS Guppy F-036 (Micron CMOS sensor MT9V022) has a pipelined glo-
bal shutter with simultaneous integration and readout.