184
See also
For detailed description about the trigger modes ( https://www.matrix-vision/manuals/ [mv←-
IMPACT Acquire API])
• C: TCameraTriggerMode
• C++: mvIMPACT::acquire::TCameraTriggerMode
1.19.1.3.2.2 Exposure aka Integration
After an active trigger, the exposure 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. Integration time is
adjustable by software in increments of t
readline
.
1.19.1.3.2.3 Readout
When exposure 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.
1.19.1.3.3 CCD Timing
Name Description Pixel clock
20 MHz 40 MHz
t
trig
Time from trigger
(internal or external) to exposure start
9.7us 4.85us
t
trans
Image transfer time
(move image to readout cells in CCD)
45us 22.5us
t
readline
time needed to readout a line 65.4us 32.7us
t
vshift
time needed to shift unused lines away 9.7us 4.85us
t
wait
minimal time to next trigger 116us 58us
t
exposure
Integration time 1us..10s 1us..10s
t
readout
Image readout time
(move image from readout cells to memory
t
readout
= (ActiveLines ∗ t
readline
) + (788 - ActiveLines) ∗ t
vshift
+ t
readline
1.19.1.3.3.1 Timings
Note
In partial scan mode (readout window ysize < 768 lines).
MATRIX VISION GmbH
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