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Conseils hygiéno-diététiques
Ministère des Classes Moyennes
Nov 7, 2008 14:33
15 yrs ago
French term

dé-réfraction

French to English Tech/Engineering Physics Iris imaging
and "une image dé-réfractée".

Thanks in advance!
Proposed translations (English)
3 +1 de-refraction
2 -1 refraction/refracted

Discussion

FannyMc (asker) Nov 11, 2008:
Apologies for the delayed response. Thanks a lot for all the help and particularly for consulting your physicist friend - I really appreciate it!

Unfortunately all I have is a one-sentence text that doesn't provide any more info than that given above, i.e. an iris synthesis method in which a "fonction de dé-réfraction" is applied to a photograph to produce an "image numérique dé-réfractée". No explanation is given as to what exactly this entails... So I guess I will go with "de-refraction" and retain the element of confusion! Thanks again!
Martin Cassell Nov 7, 2008:
... Chris, from the fragmentary examples given I am tempted to speculate that this is about post-processing of digital images to remove/reduce some effect of "refraction" (chromatic aberration?). Clearly fuller context would help, otherwise we are left like the proverbial blind men around an elephant: extrapolating riskily from scraps of information.
Martin Cassell Nov 7, 2008:
It would help enormously if you could illuminate more of the proverbial elephant than just its toes here -- what kind of system/device/instrument is this about? What is the significance of any refraction artifacts/effects in the images?
chris collister Nov 7, 2008:
... Context always helps, but it is possible that this is a process whereby the light is first refracted (eg through a convergent lens) and then refracted again (eg through a divergent lens). Generally speaking, de-refraction doesn't make a lot of sense in physics, and I have never come across it until now!
FannyMc (asker) Nov 7, 2008:
Hello! So here are a few examples:
"...synthèse d'une image en utilisant une fonction de dé-réfraction."
"...une image numérique dé-réfractée obtenue par le procédé..."
"...procédé pour dé-réfracter des images..."
Thank you!
Martin Cassell Nov 7, 2008:
I'm concerned that there's scope to get things the wrong way round here. Please can you provide examples of where these terms occur and how they are used: armed with that I will be able to consult a physicist who can hopefully cast some (direct) light!

Proposed translations

+1
1 hr
Selected

de-refraction

pending confirmation, I can only see that this must refer to a process to compensate for the effects of refraction.

Here's an example from a slightly different field:
"Ho' is the equivalent deep water wave height that can be derived from the local wave height after being “de-shoaled” and “de-refracted.” In other words, it is what the deepwater wave height would have been if it had not been modified by shoaling and refraction."


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Note added at 3 hrs (2008-11-07 18:16:11 GMT)
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Comment from a physicist with good knowledge of optics:
Q -- Terminology: can you talk about "de-refracting" an image?
A -- I certainly wouldn't...... do we have a context?
It could be "correcting the image for the effects of refraction"
Not quite sure what would be gained...... or are we talking about adaptive optics here, and so needing to correct the wavefronts for the effects of different amounts of refraction in different blobs of air.
Or do they really mean diffraction in place of refraction. Non-specialists often confuse these.
Then de-diffracting could mean deconvolving the image with the point spread function, 'deconvolve' is an accepted term, whereas the others are not to my knowledge.


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Note added at 4 hrs (2008-11-07 18:34:47 GMT)
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So, clearly this is a rare usage in either language, and raises some doubts about what exactly the author OUGHT to mean, but I think as translators we we should stop deconstructing the source text once we are reasonably confident of accurately transmitting what the author actually DID mean, even if that raises factual questions -- as long as it raises the SAME questions in the minds of both source and target readerships!
Peer comment(s):
agree chris collister : Indeed. See my comment above.
59 mins
thanks chris
disagree liz askew : I have to ask the question: why is there only one English hit for "de-refraction"?? This baffles me.. no references to this on any physics site, that I can find. Surely this is suspicious??
1 hr
indeed -- but apparently equally rare in FR ; however the construction de/dé+verb exists and is 'productive' (in the technical sense) in both languages, so the existing lexicon is not necessarily a guide
agree Attila Piróth : Yes, "a process to compensate for the effects of refraction" makes physical sense.
3 hrs
thanks Attila
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4 KudoZ points awarded for this answer. Comment: "Thanks for all the help."
-1
19 mins

refraction/refracted

Well, there are very few hits indeed in French for "dé-réfraction",

but plenty for


"de refraction"


so


refracted image

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Note added at 19 mins (2008-11-07 14:53:34 GMT)
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in fact there are 12 hits for

dé-réfraction

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Note added at 20 mins (2008-11-07 14:54:12 GMT)
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and usually

it comes with "indice ....."

so this would =

refraction index

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Note added at 21 mins (2008-11-07 14:55:31 GMT)
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However, in English I have found

diffraction


[PDF]
Diffraction-enhanced imaging of a porcine eye
File Format: PDF/Adobe Acrobat
6 Sep 2007 ... 3—Diffraction-enhanced imaging (refraction image) of porcine. eyes illustrating cornea, lens, iris, retina, and optic nerve. Scattered ...
pubs.nrc-cnrc.gc.ca/cjo/cjo42/i07-132.pdf - Similar pages
by ME Kelly - 2007 - Related articles - All 2 versions

which =

refraction image

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Note added at 23 mins (2008-11-07 14:56:51 GMT)
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#
Metal iris influence on guided-mode diffraction. [J Opt Soc Am A ...
1: J Opt Soc Am A Opt Image Sci Vis. 2006 Jun;23(6):1333-9. Click here to read ... Metal iris influence on guided-mode diffraction. ...
www.ncbi.nlm.nih.gov/pubmed/16715151 - Similar pages
by PG Gerolymatos - 2006 - Cited by 1 - Related articles - All 30 versions
#
Light Microscopy: An Illustrated Guide - Google Books Result
by Ronald Jowett Oldfield, Ron Oldfield - 1994 - Medical - 160 pages
Identify the (superimposed) diffraction images, and complete the diagram below: (d) Insert the iris diaphragm into the slot of the collar. ...
books.google.co.uk/books?isbn=0723418764...
#
Olympus Microscopy Resource Center: Anatomy of the Microscope ...
In fact, the diffraction image of a point source extends periodically and symmetrically above and below this plane into a three-dimensional pattern that ...
www.olympusmicro.com/primer/anatomy/imageformationhome.html - 26k - Cached - Similar pages

so

diffraction image

is also a possibility

You will know which one suits, according to your context...

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Note added at 55 mins (2008-11-07 15:29:11 GMT)
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Hi

Well something is very fishy because if you do an advanced search in French in google with "fonction de dé-réfraction" you come up with nothing :-)

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Note added at 56 mins (2008-11-07 15:30:36 GMT)
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Certainly, there are google hits for "fonction de diffraction"..

# [PDF]
TD N°7 & 8 : Diffraction et réseaux
- [ Translate this page ]
File Format: PDF/Adobe Acrobat - View as HTML
est la « fonction réseau » de N fentes infiniment fines centrées sur les facettes réfléchissantes. ... fonction de diffraction F( ...
calys.obspm.fr/~fouchet/optiqueI/TD7&8%20LP343%2007-08.pdf - Similar pages
#
PII: S1251-8069(97)83263-0
- [ Translate this page ]
fonction d’etalement dans le plan focal recombine est le produit des transformees de ... fonction de diffraction. Si l’objet observe dans notre cas comporte ...
linkinghub.elsevier.com/retrieve/pii/S1251806997832630 - Similar pages
by A Labeyrie - 1997 - Cited by 1 - Related articles

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Note added at 19 hrs (2008-11-08 09:40:56 GMT)
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For the record I have written to this address to see if the Professor in question will answer my query:

#
More results from jobs.trovit.co.uk »
#
Aberdeen Biomedical Imaging Centre
Institute of Medical Sciences · University of Aberdeen · Foresterhill · Aberdeen · AB25 2ZD ... Director: Professor Ian Booth · Email: [email protected] ...
www.abdn.ac.uk/ims/imaging/ - 15k - Cached - Similar pages

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Note added at 19 hrs (2008-11-08 09:41:24 GMT)
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I would like my answer from an expert, then my mind will be put at rest.

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Note added at 2 days9 hrs (2008-11-09 23:36:39 GMT)
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Hi

I have just found this:

Dictionnaire Synonymique - Google Books Result
by Anthonny Guerronnan - 1979 - Photography - 175 pages
Le phénomène de la déviation est désigné sous le nom de réfraction (voir ce mot). 396. ... Cette disposition rappelle le fonctionnement de l'iris de l'œil, ...
books.google.co.uk/books?isbn=0405096208...

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Note added at 4 days (2008-11-11 17:27:41 GMT) Post-grading
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Here is the answer from Professor Fiona Gilbert:

thank you for your email. I have not heard of this term so probably should not comment.

Sorry I cannot help,

Regards,

Fiona Gilbert.

Professor Fiona J Gilbert FRCP,FRCR,
Roland Sutton Chair of Radiology,
Imaging Leader,
Aberdeen Biomedical Imaging Centre,
University of Aberdeen,
Foresterhill,
Aberdeen AB25 2ZD
tel/fax 01224 559718
Note from asker:
Hey there. Thanks for your help (yet again!). I'm pretty confident that it's not a typo because it's used quite a few times, including with "de", e.g. "fonction de dé-réfraction". I'll have a look through the other info you provided now. Thanks.
Peer comment(s):
neutral Martin Cassell : liz, I really feel this is a case where using google as a corpus can only mislead ...
3 hrs
See the reference from Professor Gilbert. I think a translator's note is a must here.
disagree Attila Piróth : diffraction has nothing to do with refraction
6 hrs
I am querying the correctness of the original French, and putting other possibilities. I am not at all convinced that the term in French is correct either, that it my whole point. The French sites with this term are littered with typographical errors..
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