Only released in EOL distros:
Package Summary
 No API documentation 
cv_markers
- Author: James Bowman
 - License: BSD
 - Repository: ros-pkg
 - Source: svn https://code.ros.org/svn/ros-pkg/stacks/vision_opencv/tags/vision_opencv-1.6.13
 
vision_opencv: cv_bridge | cv_markers | image_geometry | opencv2 | opencv_tests
Package Summary
 Documented 
cv_markers
- Author: James Bowman
 - License: BSD
 - Source: git https://github.com/ros-perception/vision_opencv.git (branch: fuerte-devel)
 
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