[OSGeo-Discuss] 'lossless' JPEG2000

[Michael P. Gerlek]

François:

When you say "Mega-Images (-> geo-sized images)", just how big are you talking about?

If you are in the 10-100GB range, I/LizardTech would be very interested in talking with you about the project, and also about supporting some of the geo metadata conventions.  (Especially if you can do GB-sized data sets in less than 1GB of RAM without requiring the image be tiled!)  ((Do you have any benchmark data you can share?)

-mpg

 

> -----Original Message-----
> From: discuss-bounces at lists.osgeo.org 
> [mailto:discuss-bounces at lists.osgeo.org] On Behalf Of 
> François-Olivier Devaux
> Sent: Tuesday, February 26, 2008 12:47 AM
> To: discuss at lists.osgeo.org
> Subject: [OSGeo-Discuss] 'lossless' JPEG2000
> 
> Hi,
> 
> Norman Vine has pointed to me this discussion about JPEG 2000, and I 
> thought it might be interesting to give you a small overview on JPEG 
> 2000 and present the OpenJPEG library on which we are working.
> 
> --------
> FIELDS WHERE JPEG 2000 IS USED
> 
> JPEG 2000 is becoming the reference in image compression for 
> professional applications, where precision and flexibility is really 
> necessary.
> 
> The most know field using JPEG 2000 is Digital Cinema, where 
> JPEG 2000 
> has been favored against MPEG2 and H.264. Linked to that field, High 
> Quality Broadcast applications are also turning to JPEG 2000 
> because of 
> its quality and scalability (low resolution versions can be extracted 
> directly from a high resolution sequence without any re-encoding, and 
> JPEG 2000 sequences are encoded in intra which eases video editing).
> 
> More close to your field is Archiving, where we are feeling a 
> trend to 
> select JPEG 2000 as compression algorithm
> http://www.egov.vic.gov.au/index.php?env=-inlink/detail:m1780-
1-1-8-s-0:l-9669-1-1--
> 
> Medical imaging applications, where lossless compression is a 
> important 
> requirement, are also taking full advantage of JPEG 2000 
> remote browsing 
> possibilities (with the JPIP protocol)
> http://www.earthtimes.org/articles/show/aware-inc-to-demonstra
te-groundbreaking-medical-imaging-streaming-solution-at-> himss08,290686.shtml
> 
> ---------
> JPEG 2000 FEATURES
> 
> The JPEG 2000 features that are interesting for GeoSpatial 
> Imagery is of 
> course the ability to achieve lossless compression, the scalability 
> (lower quality and resolutions as well as spatial areas can 
> be extracted 
> from a compressed file, without the need of decompression the entire 
> file), the high precision (most codecs can at least handle 16 
> bits per 
> component, and up to 256 components) and the fact that the 
> core coding 
> system can be obtained free of charge.
> JPEG 2000 also has an inherent robustness higher than most 
> compression 
> schemes (JPEG, ...) and a great protocol to interactively remotely 
> browse images called JPIP.
> 
> -----
> OPENJPEG
> 
> OpenJPEG, is an open-source JPEG 2000 library. It has been 
> very recently 
> remodeled by the CNES and the french company CS to meet the 
> requirements 
> of applications using Mega-Images (-> geo-sized images). Independent 
> access to tiles has been improved, in order to increase the library 
> encoding and decoding performances. This new version should be made 
> accessible to users at the beginning of March. We are very 
> happy of the 
> performances of this new version, and are open to new contributions.
> Regarding other JPEG 2000 open source solutions in your 
> field, the GDAL 
> library has a JPEG 2000 module that is based on Jasper, which 
> is a great 
> library, but has unfortunately not evolved for the last years.
> 
> -------------
> 
> Cheers,
> 
> François
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