Frame Memory And Deferred Image Transport; Deferred Image Transport - Allied Vision Technologies AVT Marlin Technical Manual

Controlling image capture

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 Marlin 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.
Marlin cameras are equipped with 8 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
Marlin F-033
Marlin F-046
Marlin F-080
Marlin F-131
Marlin F-145
Marlin F-146
Marlin F-201
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.
Note
Configuration
To configure this feature in an advanced register: See
109: Advanced register: Deferred image transport
215.
Memory Size
17 frames
13 frames
7 frames
4 frames
3 frames
3 frames
2 frames
MARLIN Technical Manual V2.4.0
Table
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