Jpeg Encoder in VTK?

[David Gobbi]

Hi Julian, Sebastien,

I think that a more conservative approach might be better,
i.e. write a vtkJPEGWriter class that uses libjpeg.  That
will a) guarantee compliance with the JPEG standard and
b) be a lot easier than re-writing the JPEG code.

A jpeg CODEC would also be nice, but in my opinion it should
be separate from the JPEG writer.  

The current vtkTIFFWriter should also be replaced one of these
days... it doesn't even support the baseline TIFF standard!  It 
would be nice if there was a compile-time options to use libtiff.

Just to reiterate, any VTK image readers/writers for non-trivial
file formats should be based on existing standard libraries 
e.g. libtiff, libjpeg, libpng, libnetcdf, etc.  

 - David

--
  David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario

On Thu, 9 Mar 2000, Sebastien Barre wrote:

> At 11:16 09/03/00 +0800, Julian Chen a écrit:
> 
> >     Is there anyone who made a vtkJPEGWriter class?
> >
> >     If the answer is no, I may start building one. Thanks for information.
> 
> Cool :)
> 
> Well, if I may, I would first suggest you to write a kind of vtkJpegCodec 
> class that would be responsible for coding/decoding a JPEG stream into the 
> corresponding bytes/words/whatever, then write a vtkJpegReader/Writer based 
> on (or using) that class.
> 
> Then, we could use that vtkJpegCodec to support JPEG compression in the 
> TIFF reader, and in a future medical file reader (DicomReader). In that 
> context (medical) I would add that a "JPEG lossless" support would be great 
> (I'm not sure it's included in jpeg-6b, but there are patches).
> 
> Good luck :)
> 
> 
> --
> Sebastien BARRE
> IRCOM-SIC, UMR-CNRS 6615 - Université de Poitiers
> Bât. SP2MI, Bvd 3 - Téléport 2, BP 179 F-86960 Futuroscope Cedex
> Tel. : +33 (0)5 49 49 65 95 / 65 83, Fax : +33 (0)5 49 49 65 70
> http://www-sic.univ-poitiers.fr/barre/ ou  http://www.hds.utc.fr/~barre/
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