1.19 Appendix A. Specific Camera / Sensor Data 179
Mode Description
Continuous Free running, no external trigger signal needed.
OnDemand Image acquisition triggered by command (software trigger).
OnLowLevel As long as trigger signal is Low camera acquires images with own timing.
OnHighLevel As long as trigger signal is High camera acquires images with own timing.
OnFallingEdge Each falling edge of trigger signal acquires one image.
OnRisingEdge Each rising edge of trigger signal acquires one image.
OnHighExpose Each rising edge of trigger signal acquires one image, exposure time corresponds to pulse
width.
TriggerSource mvIMPACT Acquire TriggerSource GenICam(BCX)
GP-IN0 Line4
GP-IN1 Line5
See also
For detailed description about the trigger modes ( https://www.matrix-vision/manuals/ [mv←-
IMPACT Acquire API])
• C: TCameraTriggerMode
• C++: mvIMPACT::acquire::TCameraTriggerMode
Note
Trigger modes which use an external input (ctmOnLowLevel, ctmOnHighLevel, ctmOnRisingEdge,
ctmOnFallingEdge) will use digital input 0 as input for the trigger signal. Input 0 is not restricted to
the trigger function. It can always also be used as general purpose digital input. The input switching
threshold of all inputs can be programmed with write_dac(level_in_mV). The best is to set this to the
half of the input voltage. So for example if you apply a 24V switching signal to the digital inputs set the
threshold to 12000 mV.
1.19.1.2.2.2 Exposure aka Integration
After an active trigger, the integration phase starts with a maximum jitter of t
trig
. If flash illumination is enabled
in software the flash output will be activated exactly while the sensor chip is integrating light. Exposure time is
adjustable by software in increments of t
readline
.
1.19.1.2.2.3 Readout
When integration is finished, the image is transferred to hidden storage cells on the CCD. Image data is then shifted
out line-by-line and transferred to memory. Shifting out non active lines takes tvshift, while shifting out active lines
will consume t
readline
. The number of active pixels per line will not have any impact on readout speed.
1.19.1.2.3 CCD Timing
MATRIX VISION GmbH
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