20.1 mvBlueFOX-[Model]220 (0.3 Mpix [640 x 480]) 191
See also
For detailed description about the trigger modes (https://www.matrix-vision/manuals/ [mvI←-
MPACT Acquire API])
• C: TCameraTriggerMode
• C++: mvIMPACT::acquire::TCameraTriggerMode
20.1.2.2 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. Exposure time is
adjustable by software in increments of t
readline
.
20.1.2.3 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.
20.1.3 CCD Timing
20.1.3.1 Timings
Name Description Pixel clock
12 MHz 24 MHz
t
trig
Time from trigger
(internal or external) to exposure start
10us
t
trans
Image transfer time
(move image to readout cells in CCD)
64us 32us
t
readline
time needed to readout a line 64us 32us
t
vshift
time needed to shift unused lines away 3.15us 1.6us
t
wait
minimal time to next trigger 64us 32us
t
exposure
Exposure time 2uss - 128s
t
readout
Image readout time
(move image from readout cells to memory
t
readout
= (ActiveLines ∗ t
readline
) + (510 - ActiveLines) ∗
t
vshift
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