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Controlling image capture
OSCAR Technical Manual V2.4.0
117
In this case the camera can resynchronize the horizontal clock to the new
trigger event, leaving only a very short uncertainty time of the master clock
period.
Frame memory and deferred image transport
An image is normally captured and transported in consecutive steps. The
image is taken, read out from the sensor, digitized and sent over the 1394
bus.
As all Oscar cameras are equipped with built-in image memory, this order of
events can be paused or delayed by using the deferred image transport fea-
ture.
Oscar cameras, by standard, are equipped with 32 MB RAM (Oscar F-810C:
64 MB RAM). As an option, the memory can be extended at the factory to a
maximum of 256 MB.
The table below shows how many frames can be stored by each model. The
memory is arranged in a FIFO (First in First out) manner. This makes address-
ing for individual images unnecessary.
Deferred image transport is especially useful for multi-camera applications
where a multitude of cameras grab a certain number of images without hav-
ing to take available bus bandwidth, DMA- and ISO-channels into account.
Model Camera idle Camera busy
Oscar F-320C ± 3.35 µs ± 98 µs
Oscar F-510C ± 6.00 µs ± 134 µs
Oscar F-810C ± 7.85 µs ± 128 µs
Table 40: Jitter at exposure start
Note
L
• Jitter at the beginning of an exposure has no effect on
the length of exposure, i.e. it is always constant.
Model # frames (standard) # frames (256 MB)
Oscar F-320C 3 frames (32 MB) 31 frames (256 MB)
Oscar F-510C 2 frames (32 MB) 23 frames (256 MB)
Oscar F-810C 3 frames (64 MB) 15 frames (256 MB)
Table 41: FIFO memory size