Shutter Methods - THORLABS DCU223x Operation Manual And Sdk

DCx Cameras

2.3.5 Shutter Methods

Global shutter
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Rolling shutter
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Rolling shutter with global start
Note
Note on the schematic diagrams: These illustrations show a schematic view of the image capture sequence. The
sensor exposure and readout times and the transmission times depend on the camera model and settings.
For more information on flash timing see the
General
The image is recorded in the sensor in four phases:
Reset pixels of the rows to be exposed
Exposure of pixel rows
Charge transfer to sensor
Data readout
The sensor cells must not be exposed during the readout process. The sensors of the DCx Cameras have no
mechanical shutters, but work with electronic shutter methods instead. Depending on the sensor type, either the
rolling shutter method or the global shutter method is used.
Global shutter
On a global shutter sensor, all pixel rows are reset and then exposed simultaneously. At the end of the exposure,
all rows are simultaneously moved to a darkened area of the sensor. The pixels are then read out row by row.
Exposing all pixels simultaneously has the advantage that fast-moving objects can be captured without geometric
distortions. Sensors that use the global shutter system are more complex in design than rolling shutter sensors.
All CCD sensors as well as some CMOS sensors use the global shutter method.
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Digital In-/Output (Trigger/Flash)
Global shutter sensor in live mode
chapter.
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