Invalid image from android_tutorial_camera?

asked 2011-10-05 04:33:14 -0500

Nathan
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updated 2011-10-05 05:09:26 -0500

I believe I have the latest code for rosjava and the android rosjava. But my ubuntu laptop will not display an image from the /camera/image_raw topic. I even tried changing the topic to /camera/image_raw/compressed. I have tried various ways of invoking image_view on the laptop but it always displays a blank window. I know the phone is sending images because I can view then using the android_image_transport app on another phone when all of them are tied to the same ubuntu ros master. I cannot rosbag the image topics from the android_tutorial_camera app either. The bag is empty/corrupted. Help please?

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answered 2012-01-27 03:59:51 -0500

damonkohler
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Copying from the comment:

Looking at the terminal running roscore, I saw I was victim of using my workstations hostname instead of its IP. Similar to another post in answers.ros.org, I did an "export ROS_IP='192.168.1.2'" in both terminals -- the one running roscore AND the one with image_view

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answered 2011-10-06 03:06:02 -0500

Daniel Canelhas
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Have you tried the following in your terminal:

To print the contents of one message on screen (ctrl-C to interrupt):

rostopic echo -n 1 /camera/image_raw

To check the bandwidth used by the topic:

rostopic bw /camera/image_raw

To check the frequency of publishing:

rostopic hz /camera/image_raw

Another thing you can do, after starting image_view like this:

rosrun image_view image_view image:=/camera/image_raw

is to open another terminal and typing

rxgraph

This should show if image_view is actually subscribing to the topic. Assuming that the previous rostopic tests revealed that data is in fact being published on the topic. As a last resort:

roswtf

If no data is being sent to the topic, there could be something wrong with the camera driver.

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Thank you for the debug tips. Looking at the terminal running roscore, I saw I was victim of using my workstations hostname instead of its IP. Similar to another post in answers.ros.org, I did an "export ROS_IP='192.168.1.2'" in both terminals -- the one running roscore AND the one with image_view

Nathan ( 2011-10-06 07:52:57 -0500 )edit

Could you please post your solution as an answer and accept the answer?

damonkohler ( 2011-10-08 04:18:53 -0500 )edit

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Invalid image from android_tutorial_camera?

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