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ensenso / ros_driver

Official ROS driver for Ensenso stereo cameras.
http://wiki.ros.org/ensenso_driver
BSD 3-Clause "New" or "Revised" License
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Camera does not support parameter Exposure #15

Closed tabelh closed 5 years ago

tabelh commented 5 years ago

I am currently walking trying to complete the tutorial for the ROS ensenso driver. When i try to run my client, with the code provided http://wiki.ros.org/ensenso_driver/Tutorials/Parameters, i get the error that i am trying to use an attribute that is not available. :~/ensenso_tutorials/ensenso_ws$ rosrun ensenso_camera ensenso_client.py Traceback (most recent call last): File "/home/thomas/ensenso_tutorials/ensenso_ws/src/ros_driver/ensenso_camera/src/ensenso_client.py", line 36, in result = ensenso_client() File "/home/thomas/ensenso_tutorials/ensenso_ws/src/ros_driver/ensenso_camera/src/ensenso_client.py", line 25, in ensenso_client exposure = get_parameter.get_result().results[0].float_value AttributeError: 'NoneType' object has no attribute 'results'

this i could "solve" by deleting the last part (results & float_val) of the following statement: exposure = get_parameter.get_result().results[0].float_value

When i run the code it returns None, which I recon could be because I altered the last part of the statement above, but it also returns that the camera does not support the reading of the exposure parameter. [ WARN] [1551961309.027018767]: Reading the parameter Exposure, but the camera does not support it! I added the bare minimum to the code provided in the tutorial. ensenso_client.txt

saierd commented 5 years ago

The message means that the current camera does not support the exposure setting (i.e. it doesn't have an Exposure node in the NxLib tree).

What type of camera are you using? If you open it in NxView, can you adjust the exposure slider in the parameter window?

tabelh commented 5 years ago

I am using a N35, to my memory adjusting the exposure in nxView was possible.

saierd commented 5 years ago

That sounds weird, the N35 should definitely have the exposure node.

I found an error in your script, though. After sending the goal, you need to wait for the result to arrive with

get_parameter.wait_for_result()

You can see a more complete example with waiting and error checking in the tests here.

Could you try if that fixes the problem? I don't know about the logged error message, though. That should not happen with your camera.