[Dcmlib] Jpeg Losless

[Jean-Pierre ROUX]

At 14:27 -0400 23/05/05, Mathieu Malaterre wrote:
>Aris,
>
>	No problem, it was just a misunderstanding...and some hot 
>french blood :)

Hi, every body!

I'm gonna add some comments in the 'allmost empty' source codes, in 
order not to confuse anybody any longer ...
;-)
Jean-Pierre Roux



>	Anyway this was also a problem for me until Jean Pierre Roux 
>explained me that lossless jpeg and JPEG-LS are completely two 
>different thing:
>
>http://www.creatis.insa-lyon.fr/pipermail/dcmlib/2005-January/001207.html
>
>and
>http://datacompression.info/JPEGLS.shtml
>[JPEG-LS is the basis for new lossless/near-lossless compression
>standard for continuous-tone images intended for JPEG2000. The standard
>is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression
>for Images) developed at Hewlett-Packard Laboratories]
>
>
>So yes gdcm has no JPEG-LS so far...propositions welcome. As a side 
>note I don't think you need the JPEG-LS for your application chance 
>is that the DICOM you are trying to read is some good ol' jpeg 
>lossless
>
>HTH
>Mathieu
>Ps: This is usually easier if you answer the mailing list instead of 
>personal email, thanks.
>
>
>Aris Basic wrote:
>>Im sorry you misunderstood me i say the gdcmJpegLS is saying this
>>bool gdcm_read_JPEGLS_file (std::ifstream *fp, void *image_buffer)
>>{
>> (void)fp;
>> (void)image_buffer;
>> gdcmWarningMacro( "Sorry JPEG-LS File not yet taken into account" );
>> return false;
>>}
>>
>>and ig gdcmjpeg i read that LS patch was applyed (i never said it 
>>was not :) )
>>so im wondering is support maybe transparent ? no need for special LS stub or
>>LS is not supported (as per stub)
>>
>>Mathieu Malaterre wrote:
>>
>>>Aris Basic wrote:
>>>
>>>>Hi is the jpeg losless supported ? according to the code stub in 
>>>>CVS its seams like tis not even though gdcmjpeg info talk about 
>>>>applyed jpeg ls patch
>>>
>>>
>>>
>>>Aris,
>>>
>>>   Could you please demonstrate how you reach the conclusion that 
>>>the lossless patch was not applied to the official ijg library ? 
>>>I'd love to hear it.
>>>
>>>Thanks,
>>>Mathieu
>>
>>
>>
>>
>
>_______________________________________________
>Dcmlib mailing list
>Dcmlib at creatis.insa-lyon.fr
>http://www.creatis.insa-lyon.fr/mailman/listinfo/dcmlib

   Jean-Pierre ROUX
   CREATIS - CNRS UMR 5515, INSERM U 630
   Laboratoire de Radiologie Experimentale
   Hopital Cardiologique
   28 Avenue du Doyen LEPINE
   B.P. Lyon-Montchat
   69394 Lyon Cedex 03
 
   Tel      : (+33) 04 72 35 74 12
   Fax      : (+33) 04 72 68 49 16
   URL      : http://www.creatis.univ-lyon1.fr
   e-mail   : jpr at creatis.univ-lyon1.fr