Re: [WM]: medical image watermarking

[Patrice Rondao Alface <rondao@tele.ucl.ac.be>]

Dear all,

Filtering an image is of course useful to detect tumors, highlight some fea= tures, or register images from different modalities
etc  But I am really not sure whether modifying a medical image (for example wit= h the insertion of a watermark) and then
replacing the original by this mod= ified version is legal.
I know that some countries prohibit it.
IMHO, reversible watermarking seems to be one good solution to this difficu= lt issue.
It means that if you have the secret key, you can retrieve the original wit= h no losses from the watermarked image. 

Best regards,

Patrice

> it really depends on the reason for research. Mathematical
> morphological filtering has been used to filter out sickle cells, cells
> infected with malaria parasites, it has been used to show some
> infected bones, to improve visibility in the veins/ arteries, to
> locate tumours etc. 
> 
> in otherwords, the filtering operation can be used to highlight an
>aspect or attribute of the imgae which will be interpreted
> meaninfully. 
> 
> florence 
> 
> 
> diwu8@cs.tamu.edu writes: 
> 
> > 
> > I am also hoping to know which image processing operations are
> >allowed 
> > with medical images for watermarking purposes, meaning that
> >medical   images processed by these operations still preserve their
> >qualities   for diagnosis?
> > 
> > If mathematical morphological filteringi is applied to images for 
> >segmentation, it will change the images and the embedded
> >watermarks.   Geomettric transformations (rotation, scaling and
> >translation), on the 
> > other hand, don't change the image content, and the watermark in
> >the   image if the watermark is designed to be robust to these 
> >transformations. The transformed images therefore, I think, can
> >still   be used for original purposes.
> > 
> > Although the following distortions were tested for robustness of 
> >watermking in some papers, I am not sure if it is reasonalbe to let
> >a   watermarking system robust to them too, when watermarking
> >medical   images?
> > additive noise (salt-pepper, gaussian, etc); low-pass filtering 
> >(gaussian, mean, etc); Jpeg compression (with different quality 
> >factor); and/or others.
> > 
> > I am looking forward to hearing your comments. Thank you very
> >much.     Di      Quoting F Tushabe
> ><tushabe@cit.mak.ac.ug>:   
> >> these are very good questions. i would like to hear the answers.
> >> What i know is that mathematical morphological filtering is
> >> veery  popular in medical images.
> >> florence Frank Luck writes:
> >>> hi,
> >>>   I am new in this field and I'll need your help.
> >>> Does anyone know which image processing operations are allowed
> >>> with  medical images? By this I mean on compression, filtering,
> >>> geometric  distortion etc..
> >>>  Which requirements should watermark satisfy  to be applied for 
> >>> medical image watermarking?
> >>> Thank you in advance,
> >>>     Frank

Patrice Rondao Alface
PhD student
Université catholique de Louvain
Laboratoire de Télécommunications et Télédétection Place du Levant, 2
B-1348 Louvain-La-Neuve
Belgium

phone: +32 (0)10 47 85 51
fax :  +32 (0)10 47 20 89
email: rondao@tele.ucl.ac.be
office: a.147


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