[OSGeo-Discuss] 'lossless' JPEG2000

[Bruce.Bannerman at dpi.vic.gov.au]

IMO:

Thanks for the reply Traian,


I don't mean to be dismissive of this report, but I was hoping for 
something more definitive to prove that 'lossless' JPEG compressions did 
indeed protect the integrity of the data.. 

Perhaps its just my ignorance, but I was hoping for something along the 
lines of:

- a study of a range of typical spatial 'imagery'.

- evaluation of all spectral values for each pixel in each image before 
compression.

- 'lossless' compression  of the images

- restoration of the compressed images

- comparison of all spectral values for each pixel in each restored image 
against the original pre-compressed values.

- definitive statement with reference to the study results.


Bruce


> 
> JPEG2K supports lossless via a reversible wavelet transform with 
> integral coefficients (which make it reversible, and so lossless). 
> Here is a reference:
> 
> http://www.ece.uvic.ca/~mdadams/publications/pacrim2001.pdf
> 
> 
> 
> Traian
> 






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