6 Camera Control for the pco.edge
pco.edge User Manual V1.03 © PCO AG, Germany
19
6.2.2 Global Shutter – Timing Details
First, all pixels are globally reset and these reset values are shifted into so-
called diffusion nodes. From there, they are non-destructively read out into
memory as reset dark images. The exposure starts after transfer of the reset
dark image to the diffusion nodes, where they are stored on the chip. The
exposure is stopped by global charge transfer to the diffusion nodes. Then,
the exposure image is read out to the memory, where the former reset dark
image is subtracted to perform an external correlated double sampling,
which reduces the noise. Since two images have to be read out to receive
one resulting image, the sCMOS image sensor’s global shutter mode has
only half of the frame rate of the rolling shutter mode.
Reset Exposure Readout
Timing
The exposure and delay time can be adjusted in steps of 10µs.
[FPS based] The camera will optimize the image recording to achieve the
selected frame rate with chosen exposure time as close as possible.
Note: • Only for [Auto Sequence] trigger mode
• “FPS based” mode only available with Camera Link Interface
First the frame rate is set. If the time required for readout of the image is
longer than 1 / frame rate, then the frame rate will be reduced to 1 / treadout.
The frame rate can be adjusted in steps of 1 mHz (global shutter).
If the selected exposure time would require a lower frame rate, the
exposure time is cut to the maximum possible time at that frame rate.
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