This package contains the actual ImageZero algorithm written by Christoph Feck. Some methods have been modified so that they are contained within namespaces, the build system has been rewritten to generate a catkin library, and irrelevant files have been removed.
If you are interested in using this algorithm to manipulate ROS images, you probably actually want to look in the imagezero_ros package for direct image manipulation or the imagezero_image_transport package for ROS image_transport plugins.