[Insight-users] Dearth of 3D compression -3D SPIHT

[Invisible Human]

Hi Luis,

Yes i am looking for lossless compression only.  The best i have encountered so far is the jpeg part 2 compression provided by the kakadu library but even that compresses the 500MB 3D image to 50% of its original size which seems a little strange considering that the images have at least 30% 0-valued pixels.  My guess is that all algorithms are primarily for 2D slices but tweaked for 3D images.  No algorithm really exploits both spatial and temporal redundancies.

I have read good things about an algorithm called 3D SPIHT but havent been able to find any decent implementation for it.

Do you have any other pointers?

Regards,

IH

----- Original Message ----
From: Luis Ibanez <luis.ibanez at kitware.com>
To: Invisible Human <itk_at_stanford at yahoo.com>
Cc: Insight Users <insight-users at itk.org>
Sent: Thursday, May 3, 2007 10:37:05 PM
Subject: Re: [Insight-users] Dearth of 3D compression -3D SPIHT


Hi Invisible Human,

Yeap,
there are not many 3D compression algorithms ready to use out there.

Are you looking for lossless compression ?


    Regards,


        Luis


------------------------
Invisible Human wrote:
> Am i seriously mistaken or is there a genuine dearth of good image compression algorithms which consider redundancy in all 3 dimensions?
> 
> Does anyone have any experience with ITK and/or 3D SPIHT ?
> 
> IH
> 
> 
> 
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