[OSGeo-Discuss] 'lossless' JPEG2000

[Michael P. Gerlek]

So that's 10GB of data, using tiles, at 100MB memory?  That's good, and maybe requiring tiles for larger images is something I could get used to.  What's the speed like?
 
We use both the GMLJP2 standard and the GeoTIFF-tag approach.
 
Gosh but I'd to get behind an open source geo-aware JP2 solution.
 
-mpg
 



________________________________

	From: discuss-bounces at lists.osgeo.org [mailto:discuss-bounces at lists.osgeo.org] On Behalf Of François-Olivier Devaux
	Sent: Wednesday, February 27, 2008 1:50 AM
	To: OSGeo Discussions
	Subject: Re: [OSGeo-Discuss] 'lossless' JPEG2000
	
	
	Hi Michael,
	
	We made some tests with tiles of 1000*1000 pixels, with 10000 tiles, and the memory used is about 112 MB for the encoding and 114 MB for the decoding.
	If you don't want to use tiles, I don't think OpenJPEG can beat the commercial applications like Kakadu.
	
	What standard do you follow for metadata ? OGC GMLJP2, or do you include GeoTIFF information in a JP2 file like Luratech suggested to the JPEG committee ?
	
	Cheers,
	
	François
	
	Michael P. Gerlek a écrit : 

		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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