Here are some more comments about the format =) : JP4 is basically JPEG modified to effeciently compress raw Bayer mosaic ( http://community.elphel.com/jp4/jp4demo.php ), originally we developed it fro Google Books project, it is also used in hi-resolution Street View.
Ourselves we now use custom plugin for ImageJ where we do the processing ( http://blog.elphel.com/2010/12/zoom-in-now-enhance-results/ ). One of such the plugins reads the JP4 format (and it's flavors) converting it into monochrome 32-bit format, reading custom Exif MakerNote and un-applying analog gains and gamma-conversion (basically restoring the raw sensor pixel output) - it is http://elphel.git.sourceforge.net/git/gitweb.cgi?p=elphel/ImageJ-Elphel;a=blob;f=JP46_Reader_camera.java It would be nice to have a Free Software image processing tools to read the only completely open hardware cameras. If somebody could help us to implement such import, we could maintain it in the future, updating additional MakerNote field when they will be added. Oleg
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