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Allied International AVT OSCAR V2.4.0 Manual Do Utilizador

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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
eTrans
arg
T
Dummy
T
Dump
T
Scan
+
+
+
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