[gdal-dev] New JP2Grok Driver for JPEG 2000

Even Rouault even.rouault at spatialys.com
Mon May 3 13:40:00 PDT 2021


my quick look at the JP2Grok driver code is that it doesn't generate the 
HTJ2K / Part 15 variant of JPEG2000, at least there's nothing suggesting 
that (didn't try running it). I guess that there would be a need for a 
dedicated creation option in the driver for that to happen, so there 
shouldn't be interoperability issues of the files it generates with 
other JPEG2000 capable drivers.

I'm not sure which support of HTJ2K the ECW and MrSID SDKs have. I 
believe there's such support Kakadu in recent releases, but might be 
subject to extra fees (or perhaps for  faster support)

There's a BSD 2 licensed implementation of HTJ2K in 
https://github.com/aous72/OpenJPH . From what I see, Grok HTJ2K support 
has incorporated some of that code.  So for a BSD 2 compatible use in 
GDAL, either a GDAL driver should be built from OpenJPH as a standalone 
library, or relevant parts of OpenJPH should be "ported" to OpenJPEG.


Le 03/05/2021 à 22:17, Sean Gillies via gdal-dev a écrit :
> Hi  Aaron, and everyone,
> It seems like interoperability could be harmed if we release GDAL with 
> a JP2 driver that writes JPEG 2000 files that the main open source JP2 
> driver can't read. Would it make sense to add compatibility to 
> OpenJPEG before the PR gets merged? Or are we already in a state of 
> inoperability between JP2ECW, JP2MRSID, and JP2OpenJPEG?
> On Mon, May 3, 2021 at 1:52 PM Aaron Boxer <boxerab at gmail.com 
> <mailto:boxerab at gmail.com>> wrote:
>     Hi Jean-Roc,
>     Good question - unfortunately OpenJPEG doesn't currently support
>     HTJ2K,
>     it only supports JPEG 2000 Part 1. I am sure that this will
>     eventually be integrated,
>     but it isn't there at the moment.
>     Cheers,
>     Aaron
>     On Mon, May 3, 2021 at 12:05 PM Jean-Roc Morreale (ml)
>     <jrmorreale_ml at enoreth.net <mailto:jrmorreale_ml at enoreth.net>> wrote:
>         Hi Aaron,
>         Is the HTJ2K's output still readable by a regular GDAL/OpenJPEG ?
>         Regards,
>         Jean-Roc Morreale
> -- 
> Sean Gillies
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