6 Camera Control for the pco.edge
pco.edge User Manual V1.03 © PCO AG, Germany
21
In [External Exposure Control] trigger mode the external signal controls start
of image acquisition and duration of the exposure. 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.
In this mode, the exposure starts always after the readout of the dark image
is completed. The length of the exposure has been detected by the sensor
from the trigger input. The exposure is stopped by global charge transfer to
the diffusion nodes after the respective time. 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 and
the exposure cannot start during readout time of the dark image, this
specific global shutter mode provides less than half of the frame rate of the
rolling shutter mode.
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