Difference: JPEG2000 (14 vs. 15)

Revision 1512 Oct 2017 - MartinTurner

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  Lossless mode: Experiment from Forum. The compression is: 40421376 >> 15735885 (0.389 ratio) (in 10s) rearrange raw image to interleave all bayer components, and used -F 2752,1836,4,12,u , but the compression is worse: 19175592 (ratio 0.474) with Bzip2, the result size is 17934600 (0.444 ratio) (in 8.3s)
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"Lossless j2k is not magic. PNG will out-perform it with normal image sizes. Where j2k comes into its own is with massive images, like GIS datasets. j2k can efficiently decode a small section of the image, which PNG and such is not designed for." "Why not de-bayer it? Do you really expect to use the image without de-bayering it? Use the highest quality de-bayer you can find and be done with it."
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"Lossless j2k is not magic. PNG will out-perform it with normal image sizes. Where j2k comes into its own is with massive images, like GIS datasets. j2k can efficiently decode a small section of the image, which PNG and such is not designed for." "Why not de-bayer it? Do you really expect to use the image without de-bayering it? Use the highest quality de-bayer you can find and be done with it.
 
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  • OpenJPEG 2.1.0 has been released (April 2014):

https://sourceforge.net/projects/openjpeg.mirror/files/2.1.0/ (*)

"Compared to the 2.0.0 version, a huge amount of bugs has been fixed, the code has been cleaned, and the library is now much more stable than before. You’ll find more info about this release here: http://openjpeg.googlecode.com/svn/tags/version.2.1/NEWS and a detailed view of all the changes that have been made here: http://openjpeg.googlecode.com/svn/tags/version.2.1/CHANGES

Despite a few needed changes in the API, we strongly encourage you to switch to this new version to benefit from the new features and bug fixes. Moreover, this new release is in the process of becoming an official reference JPEG 2000 software of the JPEG committee (www.jpeg.org), and as such, it will be part of the JPEG 2000 standard (Part-5 : reference software). Official approval will be in October 2014. As you may have noticed, we have also released maintenance versions of OpenJPEG : 1.5.2 and 2.0.1. Please note that the 1.5.x and 2.0.x branches will not be improved in the future and will only receive critical bug fixes, if any. A lot of work is still to be done to make OpenJPEG faster and more robust so don’t hesitate to contribute and submit your comments and ideas (here : https://code.google.com/p/openjpeg/issues/list)."

  • From the open source sw point of view the OpenJPEG is releasing 2.1 now. This is planned to be an official JPEG2000 reference code to be ratified over the Summer.

http://sourceforge.net/projects/openjpeg.mirror/files/2.1.0/

They have mainly been fixing bugs etc but would be a good test reference place as well.

https://code.google.com/p/openjpeg/

http://www.openjpeg.org/

(Historical reasons they use both google code and source forge repositories)

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OpenJPEG 2.3.0 is released: https://github.com/uclouvain/openjpeg/releases/tag/v2.3.0
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