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I think this is sensible to merge, since it does not affect the workings of the package and it removes some confusion, so merging

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Simultaneous Localization and Mapping Using Fiducial Markers

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This package implements a system that uses ceiling mounted fiducial markers (think QR Codes) to allow a robot to identify its location and orientation. It does this by constructing a map of the ceiling fiducials. The position of one fiducial needs to be specified, then a map of the fiducials is built up from observing pairs of markers in the same image. Once the map has been constructed, the robot can identify its location by locating itself relative to one or more ceiling fiducials.

Documentation is at

Recording A Bag File

Sometimes for trobleshooting purposes it is useful to record a bag file to capture the exact data on the topics going into and out of fiducials.

To do this, while the system is running, run rosbag record -a. You can upload this bag file to a file sharing service like Google Drive and link to it in your issue, this will help us diagnose the problem.