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Package Summary
compressed_image_transport provides a plugin to image_transport for transparently sending images compressed as JPEG or PNG.
- Author: Patrick Mihelich
- License: BSD
- Repository: ros-pkg
- Source: svn https://code.ros.org/svn/ros-pkg/stacks/image_transport_plugins/tags/image_transport_plugins-1.4.1
Package Summary
compressed_image_transport provides a plugin to image_transport for transparently sending images compressed as JPEG or PNG.
- Author: Patrick Mihelich
- License: BSD
- Source: svn https://code.ros.org/svn/ros-pkg/stacks/image_transport_plugins/branches/image_transport_plugins-1.4
Package Summary
compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: fuerte-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer: David Gossow <dgossow AT willowgarage DOT com>
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: groovy-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer: David Gossow <dgossow AT willowgarage DOT com>
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: hydro-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer status: maintained
- Maintainer: David Gossow <dgossow AT willowgarage DOT com>
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: indigo-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer status: maintained
- Maintainer: David Gossow <dgossow AT willowgarage DOT com>
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: indigo-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer status: maintained
- Maintainer: David Gossow <dgossow AT willowgarage DOT com>
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: indigo-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer status: maintained
- Maintainer: David Gossow <dgossow AT willowgarage DOT com>
- Author: Patrick Mihelich, Julius Kammerl
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: indigo-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer status: maintained
- Maintainer: Kenji Brameld <kenjibrameld AT gmail DOT com>
- Author: Patrick Mihelich, Julius Kammerl, David Gossow
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: melodic-devel)
Package Summary
Compressed_image_transport provides a plugin to image_transport for transparently sending images encoded as JPEG or PNG.
- Maintainer status: unmaintained
- Maintainer: Kenji Brameld <kenjibrameld AT gmail DOT com>
- Author: Patrick Mihelich, Julius Kammerl, David Gossow
- License: BSD
- Source: git https://github.com/ros-perception/image_transport_plugins.git (branch: noetic-devel)
Contents
Overview
compressed_image_transport is a plugin package for image_transport. It enables any node using image_transport classes to publish and subscribe to compressed image topics. Compression format (JPEG or PNG) and quality can be changed on the fly.
Before reading this page, make sure you understand the image_transport package
Tutorials
See image_transport/Tutorials for general instruction on using image_transport. compressed_image_transport is featured in the image_transport tutorial Examining the Simple Image Publisher and Subscriber.
ROS API
Publisher plugin
Published Topics
<base_topic>/compressed (sensor_msgs/CompressedImage)- Compressed transport subtopic.
Parameters
Searchable parameters
The plugin searches up the parameter tree starting from the <base_topic> namespace. For example, with topic /image, you could set parameter /compressed_image_transport_jpeg_quality to a global default, then override it for the specific topic by setting /image/compressed_image_transport_jpeg_quality.- Compression format to use, "jpeg" or "png".
- JPEG quality percentile, in the range [1, 100]. Lower values trade image quality for space savings.
- PNG compression level, in the range [1, 9]. Higher values trade computation time for space savings.
Parameters
Reconfigurable parameters
Starting in Diamondback, all publisher parameters are dynamically reconfigurable per-topic. See dynamic_reconfigure for details on dynamically reconfigurable parameters.- Compression format to use, "jpeg" or "png".
- JPEG quality percentile, in the range [1, 100]. Lower values trade image quality for space savings.
- PNG compression level, in the range [1, 9]. Higher values trade computation time for space savings.
Parameters
Reconfigurable parameters
Starting in Diamondback, all publisher parameters are dynamically reconfigurable per-topic. See dynamic_reconfigure for details on dynamically reconfigurable parameters.- Compression format to use, "jpeg" or "png".
- JPEG quality percentile, in the range [1, 100]. Lower values trade image quality for space savings.
- Enable compression to progressive JPEG. New in Noetic
- Enable JPEG compress optimization. New in Noetic
- JPEG restart interval in the range of [0, 65535]. New in Noetic
- PNG compression level, in the range [1, 9]. Higher values trade computation time for space savings.
Subscriber plugin
Subscribed Topics
<base_topic>/compressed (sensor_msgs/CompressedImage)- Compressed transport subtopic.
Publishing compressed images directly
Some cameras (particularly webcams) output their image data already in JPEG format. When writing a driver for such a camera, a quick and dirty approach is to simply copy the JPEG data into a sensor_msgs/CompressedImage message and publish it on a topic of the form image_raw/compressed. Then any ROS node using image_transport can subscribe to image_raw with transport compressed, just as if image_transport were used on the publisher side. Of course, the other transport topics (including image_raw itself) will not be available.
