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Video formats, modes and bandwidth
OSCAR Technical Manual V2.4.0
135
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.
Frame rates may be further limited by bandwidth limitation from the IEEE
1394 bus.
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: the curves
describe RAW8, RAW12/YUV411, RAW16/YUV422, RGB8 and max. frame
rate of CCD
• Table with max. frame rates as function of AOI by constant width
For the CCD models the following formula is used to calculate 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:
Frame rates may be further limited by longer shutter times and/or by band-
width limitation from the IEEE 1394 bus. This is not part of the formulae
below.
Details are described in the next chapter.
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 5: 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)
framerate
In
framerate
CCD
1
T
Ch eTransarg
T
Dummy
T
Dump
T
Scan
+++
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