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Issue to export images from rosbag file

asked 2017-10-29 10:51:38 -0600

ROSkinect
751 ●47 ●61 ●73

I'm recording images from /camera/image_raw to rosbag file but when I want to extract them I get gray images with little squares like a grid on them:

image description

I tried command line and launch file to record:

rosbag record -O subset /camera/image_raw

and launch file to extract the images but I get the same thing:

<launch>
  <node pkg="rosbag" type="play" name="rosbag" args="-d 2 $(find ownpackagereco)/bags/subset.bag"/>
  <node name="extract" pkg="image_view" type="extract_images" respawn="false" output="screen" cwd="ROS_HOME">
    <remap from="image" to="/camera/image_raw"/>
  </node>
</launch>

I can visualize the images from the topic while they're publishing and I can see the RGB image correctly

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1 Answer

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answered 2017-10-30 06:19:09 -0600

john.j.oneill

flag of United Kingdom of Great Britain and Northern Ireland

136 ●2 ●5

Have you tried image_saver? It includes an encoding parameter that could allow you to explicitly set it as RGB or BGR.

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image_saver works but I want to save all my topics in a bag file, it is more easy and practical

ROSkinect ( 2017-10-30 09:04:22 -0600 )edit

Couldn't image_saver work on a playing bag file? I guess I don't understand the difference between image_saver and extract_images, they seem almost interchangeable to me.