Allied Vision Technologies Pike Manual de instrucciones descargar pdf (Pagina 186)

Controlling image capture

PIKE Technical Manual V4.0.0

186

Multi-shot

Setting multi-shot and entering a quantity of images in Count_Number in

the 61Ch register enables the camera to record a specified number of images.

The number is indicated in bits 16 to 31. If the camera is put into

ISO_Enable mode (see Chapter ISO_Enable / Free-Run on page 186), this flag

is ignored and deleted automatically once all the images have been recorded.

If multi-shot mode is activated and the images have not yet all been cap-

tured, it can be cancelled by resetting the flag. The same result can be

achieved by setting the number of images to 0.

Multi-shot can also be combined with the external trigger in order to grab a

certain number of images based on an external trigger. This is especially

helpful in combination with the so called Deferred_Mode to limit the num-

ber of grabbed images to the FIFO size.

ISO_Enable / Free-Run

Setting the MSB (bit 0) in the 614h register (ISO_ENA) puts the camera into

ISO_Enable mode or Continuous_Shot. The camera captures an infinite series

of images. This operation can be quit by deleting the 0 bit.

Asynchronous broadcast

The camera accepts asynchronous broadcasts. This involves asynchronous

write requests that use node number 63 as the target node with no acknowl-

edge.

This makes it possible for all cameras on a bus to be triggered by software

simultaneously - e.g. by broadcasting a One_Shot. All cameras receive the

One_Shot command in the same IEEE 1394 bus cycle. This creates uncer-

tainty for all cameras in the range of 125 µs.

Inter-camera latency is described in Chapter Jitter at start of exposure on

page 187.

The following screenshot shows an example of broadcast commands sent with

the Firedemo example of FirePackage:

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Allied Vision Technologies Pike Manual de instrucciones Pagina 186