ALLIED Vision Technologies Marlin F-201 - Manual (Page 156)

Video formats, modes and bandwidth
MARLIN Technical Manual V2.4.0
156
The frame rates in video modes 0 to 2 are specified and set fixed by IIDC
V1.3.
Frame rates Format_7
In video Format_7 frame rates are no longer fixed but can be varied dynam-
ically by the parameters described below.
The following formula is used to calculate for the CCD models the highest
frame rate in Format_7:
It assumes that the maximum frame rate is the inverse of the sum of all
events in a CCD, which take time such as:
Details are described in the next chapters:
• Max. frame rate of CCD (theoretical formula)
• Diagram of frame rates as function of AOI by constant width
• Table with max. frame rates as function of AOI by constant width
Note
L
• Different values apply for the different sensors.
• Frame rates may be further limited by longer shutter
times and/or bandwidth limitation from the IEEE 1394
bus.
Formula 3: Frame rate calculation
Note
L
• The time to transfer the storage to the vertical shift
register (Charge transfer time)
• The time to shift out the dummy lines
• The time to dump the lines outside the AOI
• The time to shift out the lines of the AOI. (Scanning
time)
Note
L
Different parameters apply for different models.
framerate
In
framerate
CCD
1
T
Ch eTrans arg
T
Dummy
T
Dump
T
Scan
+ + +
----------------------------------------------------------------------------------------------- = =