Generate SoftwareTrigger

Programming Questions
1

Im currently trying to start a aquistion with a softwaretrigger in Python. I set nodes to the right values (this values work with the vb.net grabberocx example. The documentation is a bit lacking in cvbpy regarding softwaretrigger ( what does softwaretrigger.send_trigger return and how does it work with stream.start()?)
Can anybody provide me a minimal working example for this?
My regards Mucki

2

Hi @Mucki

to send a softwaretrigger you have to configure the camera a certain way that might differ from camera to camera:

grafik
grafik.jpg1161Ă—470 169 KB

Basically the following Nodes have to be set:
TriggerMode -> “On”
TriggerSource -> “Software” (If you use an external trigger change this accordingly)

Now you can acquire a new image by just clicking the “Execute”-Button in the TriggerSoftware node.

Note:
Some nodes write property depend on their parents state.
You can not set the TriggerSource as long as the TriggerMode is “Off”.
Keep that in mind while programming.

I have written a small example using CVBpy to achieve what you are aiming for:

import os
import cvb

device = cvb.DeviceFactory.open(os.path.join(cvb.install_path(), "drivers", "GenICam.vin"), port=0)
dev_node_map = device.node_maps["Device"]

triggerModeNode = dev_node_map["TriggerMode"]
triggerModeNode.value = "On"

triggerSourceNode = dev_node_map["TriggerSource"]
triggerSourceNode.value = "Software"

softwareTrigger = dev_node_map["TriggerSoftware"]

I hope this is what you were looking for.

Cheers
Chris

1 Like
3

Thanks for your answer, but i think that is not what im looking for. I set the nodes to on and software already. I dont want to execute the Softwaretrigger in the GenicamBrwoser but in Python using CVBpy. your working example sets the noddes to the right values ( i did that too) and you initialized a node softwaretrigger. But how do i send the trigger and save an image afterwards?

4

Hi @Mucki,

the softwareTrigger is a CommandNode, you can execute this node with the following call:

softwareTrigger.execute()

Before doing so, you might want to start the stream, thus you can call stream.wait() after triggering a new image:

stream = device.stream
stream.start()
// softwaretrigger here
image = stream.wait()

You can save the image with:

image.save("ImagePath")

So the complete working example :

import os
import cvb

device = cvb.DeviceFactory.open(os.path.join(cvb.install_path(), "drivers", "GenICam.vin"), port=0)
dev_node_map = device.node_maps["Device"]

triggerModeNode = dev_node_map["TriggerMode"]
triggerModeNode.value = "On"

triggerSourceNode = dev_node_map["TriggerSource"]
triggerSourceNode.value = "Software"

softwareTrigger = dev_node_map["TriggerSoftware"]

stream = device.stream
stream.start()
softwareTrigger.execute()
image = stream.wait()
image.save("ImagePath")

If you need further introduction or examples for pixel access or async streaming, you might want to have a look into your tutorialsfolder:

C:\Program Files\STEMMER IMAGING\Common Vision Blox\Tutorial\Image Manager\CVBpy

Cheers
Chris

1 Like
5

Thank you for the fast answer. I didnt know, that softwaretrigger could be executed via .execute(). Now it is working as i intended

1 Like