216
Note
This means, the bottom lines of the sensor will be exposed to light longer! For this reason, this mode will
only make sense, if there is no extraneous light and the flash duration is shorter or equal to the exposure
time.
Furthermore, the sensor offers two operating modes:
• free running mode (Overlapping exposure and readout)
• snapshot mode (Sequential exposure and readout) in triggered operation
1.19.2.6.2.1 Free running mode
In free running mode, the sensor reaches its maximum frame rate. This is done by overlapping erase, exposure and
readout phase. The sensor timing in free running mode is fixed, so there is no control when to start an acquisition.
This mode is used with trigger mode Continuous.
To calculate the maximum frames per second (FPS
max
) in free running mode you will need following formula:
FrameTime = (ImageWidth + 900)
*
((ImageHeight + 9) / PixelClock)
If exposure time is lower than frame time:
FPS_max = 1
----------------------
FrameTime
If exposure time is greater than frame time:
FPS_max = 1
------------------------
ExposureTime
1.19.2.6.2.2 Snapshot mode
In snapshot mode, the image acquisition process consists off several sequential phases:
1.19.2.6.2.3 Trigger
Snapshot mode starts with a trigger. This can be either a hardware or a software signal.
The following trigger modes are available:
MATRIX VISION GmbH
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