Hi folks,
in case you're interested, I completed the study of floating-point compression
algorithms on the OpenEXR image set, comparing the
compression performance of JPEG-HDR with that of the floating-point JPEG-XR
compression and a JPEG 2000 based floating point
compression format. Anyone interested in a pre-print might simply sent me a
note.
Short results for the impatient: In almost all cases, JPEG 2000 performs best
here. There is one interesting corner case, namely
the OpenEXR "StillLife" image where JPEG-HDR outperforms all other compression
schemes, which is due to the extreme nature of the
image - here JPEG-HDR profits from its adaptive tone-mapper. JPEG 2000/JPEG-XR
use a fixed mapping from floating point to integer,
offering the advantage of making lossless compression of floats possible.
So long,
Thomas
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