11
SHUTTER
6. ROLLING SHUTTER
The pco.edge 4.2 bi (UV) uses the rolling shutter mode. In this mode
the pixel reset and exposure start is carried out line by line. Each line
has the same exposure time, but a different start and end of
exposure. Within one line, the exposure starts simultaneously for all
pixels.
The exposure time of each line starts with the corresponding reset of
the line. Then after a predefined time (exposure time), the exposure is
stopped. The light induced accumulated charge carriers of the pixels
in a line are recorded into memory in a low noise (readout) mode. This
way the content of the pixels is assembled in the memory to form the
complete image.
The diagram shows different signal timing settings (see chapter 7.1).
During Show common time of ‘All Lines’ the image sensor is
completely exposed to light. The labels Show time of ‘First Line’
and ‘Last Line’ are the setting for the first / last exposed line and
Show overall time of ‘All Lines’ for the entire exposure period.
There are two different timing cases for rolling shutter mode, which
are explained on the following pages:
• exposure time > sensor readout time
• exposure time < sensor readout time
Rolling Shutter General Timing Diagram
Timing
Camera Exposure time Delay time Line time
USB 3.1
10 μs … 20 s 0 … 5 s 12.174 μs
The
exposure and
delay time can be
adjusted in steps of
one line time.
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