compressed_depth_image_transport provides a plugin to image_transport for transparently sending depth images (raw, floating-point) using PNG compression.
compressed_depth_image_transport does not have a stable code API.
compressed_depth_image_transport contains an image tranport plugin for publishing and one for receiving depth images. These classes are not normally meant to be used directly, but are loaded automatically by image_transport classes.
The publisher and subscriber plugins communicate on an internal "compressed_depth" topic. See the wiki documentation.