THORLABS DCC1645C User Manual

92 DCx camera
© 2010 Thorlabs
7.2.3.1
Capture Modes
For more information on the DCx camera capture modes see also Camera: Freerun and Camera
Basics: Trigger .
Freerun Mode
In freerun mode, the camera sensor captures one image after another at the set frame rate.
Exposure of the current image and readout/transfer of the previous image data are performed
simultaneously. This allows the maximum camera frame rate to be achieved. The frame rate and the
exposure time can be set separately. The captured images can be transferred one by one or
continuously to the PC.
If trigger mode is active, you need to disable it with is_SetExternalTrigger() before activating
freerun mode.
Single frame mode (snap mode)
When is_FreezeVideo() is called, the next image exposed by the sensor is transferred. You
cannot use the DCx camera flash outputs in this mode.
Continuous mode (live mode)
When is_CaptureVideo() is called, images are captured and transferred continuously. You
can use the DCx camera flash outputs.
Trigger Mode
In trigger mode, the sensor is on standby and starts exposing on receipt of a trigger signal. A trigger
event can be initiated by a software command (software trigger) or by an electrical signal via the
camera’s digital input (hardware trigger). For the specifications of the electrical trigger signals, see
the Technical Data: I/O Interface: Trigger Input Wiring chapter.
The trigger mode is selected using is_SetExternalTrigger() .
Software trigger mode
When this mode is enabled, calling is_FreezeVideo() immediately triggers the capture of an
image and then transfers the image to the PC. If is_CaptureVideo() is called, the triggering
of image capture and the transfer of images are performed continuously.
Hardware trigger mode
When this mode is enabled, calling is_FreezeVideo() makes the camera ready for triggering
just once. When the camera receives an electrical trigger signal, one image is captured and
transferred.
If you call is_CaptureVideo() , the camera is made ready for triggering continuously. An
image is captured and transferred each time an electrical trigger signal is received; the camera is
then ready for triggering again (recommended procedure).
Freerun synchronisation
In this mode, cameras running in freerun mode (live mode, see above) can be synchronized with
an external trigger signal. The cameras still remain in freerun mode. The trigger signal stops and
restarts the current image capture process. You can use this mode to synchronise multiple
cameras that you are operating in the fast live mode. Not all camera models support this mode
(see is_SetExternalTrigger() ).
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THORLABS DCC1645C Specifications

General

Brand	THORLABS
Model	DCC1645C
Category	Security Camera
Language	English