Allied Vision Technologies AVT Stingray Manual de instrucciones descargar pdf (Pagina 141)

Description of the data path

STINGRAY Technical Manual V2.2.0

140

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 Stingray cameras are equipped with built-in image memory, this order

of events can be paused or delayed by using the deferred image transport

feature.

Stingray cameras are equipped with 32 MByte of RAM. The table below shows

how many frames can be stored by each model. The memory operates accord-

ing to the FIFO (first in, first out) principle. This makes addressing for indi-

vidual images unnecessary.

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.

Model Memory size

Stingray F-033B/C

Stingray F-033B/C fiber

50 frames

Stingray F-046B/C

Stingray F-046B/C fiber

35 frames

Stingray F-080B/C

Stingray F-080B/C fiber

19 frames

Stingray F-145B/C

Stingray F-145B/C fiber

10 frames

Stingray F-146B/C

Stingray F-146B/C fiber

10 frames

Stingray F-201B/C

Stingray F-201B/C fiber

7 frames

Table 49: FIFO memory size

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 308 309

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Allied Vision Technologies AVT Stingray Manual de instrucciones Pagina 141