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2017-07-29 15:27:13 -0500 commented answer What is ConstPtr&?

but what does & means? If msg is already a pointer, why do we take the address of msg? Or does that & means pass

2017-07-04 09:02:15 -0500 commented answer How to save camera image when needed?

It turns out that wait_for_message actually implement this subscribe once and unregister scheme as you mentioned.

2017-07-03 12:34:04 -0500 asked a question A strange behavior of rospy.wait_for_message

A strange behavior of rospy.wait_for_message I write a node which provide image saving service during object manipulatio

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2017-06-27 12:01:04 -0500 commented answer Problem of saving depth image

Hi Andy thanks for your answer. I also run into the nan with cv_bridge. I then decrease the pointcloudcutoff from 0.5 to

2017-06-27 11:58:43 -0500 commented answer Problem of saving depth image

Hi Andy thanks for your answer. I also run into the nan problem with cv_bridge. I then decrease the pointcloudcutoff par

2017-06-26 16:41:30 -0500 commented question Problem of saving depth image

I run into the same problem. The difference is that I cannot even visualize the depth image using image_view. Have you r

2017-06-26 04:34:35 -0500 marked best answer How to save camera image when needed?

I am currently following this tutorial to publish image messages using the camera plugin. I can totally subscribe the image_raw topic and save every published image message, but that's not what I need.

I am using gazebo to collect image dataset of object manipulation. So ideally I need to capture (save to file) one image after some manipulation actions, then continue with the next round of manipulation and image capturing. So it is like a service request to save the image when needed rather than save images all the time. However, the only source of image I know in gazebo is the image topic. Does anyone have a better idea on how to do that?

Thanks!

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2017-06-26 04:27:41 -0500 commented answer How to save camera image when needed?

Thank you for your answer. It is totally an option write a node which start and stop other nodes.

2017-06-26 04:15:43 -0500 commented answer How to save camera image when needed?

Thank you! Work like a charm.

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2017-06-22 07:28:17 -0500 asked a question How to save camera image when needed?

How to save camera image when needed? I am currently following this tutorial to publish image messages using the camera