Frame Memory And Deferred Image Transport; Deferred Image Transport - AVT Pike Technical Manual

Description of the data path

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.

Deferred image transport

As all Pike 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.
Pike cameras are equipped with 64 MB of RAM. The table below shows how
many frames can be stored by each model. The memory operates according
to the FIFO (first in, first out) principle. This makes addressing for individual
images unnecessary.
Model
PIKE F-032B/C
PIKE F-032B/C fiber
PIKE F-100B/C
PIKE F-100B/C fiber
PIKE F-145B/C
PIKE F-145B/C fiber
PIKE F-145B/C-15fps
PIKE F-145B/C fiber-15fps
PIKE F-210B/C
PIKE F-210B/C fiber
PIKE F-421B/C
PIKE F-421B/C fiber
PIKE F-505B/C
PIKE F-505B/C fiber
Table 49: FIFO memory size
Deferred image transport is especially useful for multi-camera applications:
Assuming several cameras acquire images concurrently. These are stored in
the built-in image memory of every camera. Until this memory is full, the lim-
iting factor of available bus bandwidth, DMA- or ISO-channel is overcome.
Image transfer is controlled from the host computer by addressing individual
cameras one after the other and reading out the desired number of images.
Memory size
105 frames
32 frames
22 frames
22 frames
15 frames
6 frames
5 frames
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