Nov 30, 2021 16:44
2 yrs ago
50 viewers *
French term
United States
ponctuelle
French to English
Science
Physics
corrective lens optics / point spread function
"Ponctuelle" is used to describe a point spread function that gives the best optical quality as follows:
La PSF représente la répartition spatiale de l’intensité lumineuse dans le plan image d’un système optique, formée à partir d’un point source objet.
Plus la PSF est *ponctuelle*, meilleure est la qualité optique.
La PSF représente la répartition spatiale de l’intensité lumineuse dans le plan image d’un système optique, formée à partir d’un point source objet.
Plus la PSF est *ponctuelle*, meilleure est la qualité optique.
Proposed translations
(English)
| 2 +3 | compact |
Bourth
|
| 3 | focused /centered |
Drmanu49
|
| 3 | punctiform; point-perfect |
Adrian MM.
|
| 4 -3 | anastigmatic |
Johannes Gleim
|
Proposed translations
+3
6 hrs
Selected
compact
I'm expressing low confidence not because I don't think there is every chance this might be the term you're looking for but because I know zilch about the matter.
After full recovery from surgery, aberrations of the corrected eye were much smaller compared with the presurgical eye, which implied a more COMPACT point-spread function and CLEARER RETINAL IMAGES.
Point spread QUALITY (PSQ) n A measure to give of the “COMPACTNESS” of the PSF - Point spread quality - the concentration fo the point spread within a specified subtended angle space
A more COMPACT PSF over a range of defocus values would mean BETTER VISUAL PERFORMANCE over a larger range of focus.
A PERFECT OPTICAL SYSTEM images a point object into a COMPACT, high-contrast retinal image as illustrated in Figure 5. The image of a point object is called a pointspread function (PSF).
Measures of IMAGE QUALITY FOR POINT OBJECTS are based on contrast and cOMPACTNESS of the image
After full recovery from surgery, aberrations of the corrected eye were much smaller compared with the presurgical eye, which implied a more COMPACT point-spread function and CLEARER RETINAL IMAGES.
Point spread QUALITY (PSQ) n A measure to give of the “COMPACTNESS” of the PSF - Point spread quality - the concentration fo the point spread within a specified subtended angle space
A more COMPACT PSF over a range of defocus values would mean BETTER VISUAL PERFORMANCE over a larger range of focus.
A PERFECT OPTICAL SYSTEM images a point object into a COMPACT, high-contrast retinal image as illustrated in Figure 5. The image of a point object is called a pointspread function (PSF).
Measures of IMAGE QUALITY FOR POINT OBJECTS are based on contrast and cOMPACTNESS of the image
Peer comment(s):
| agree |
Daryo
: I know a bit more than "zilch" about this matter, and still can't see how to express it better.
3 hrs
|
| agree |
Tony M
: I think this does actually best describe it, and if those references you've found are to be trusted, then it certainly sounds right: 'ponctuel' > 'having the nature of a point'
8 hrs
|
| agree |
Jennifer Levey
: I know quite a lot more than "zilch" about this matter and, like Daryo, I can't see how to express it better.
13 hrs
|
4 KudoZ points awarded for this answer.
Comment: "Thank you, this makes sense."
5 mins
focused /centered
A suggestion
Point spread function out of focus
Out-of-focus point spread functions. There are many ways in which the performance of a lens can be characterized, most of which measure properties of the in-focus image. ... The image created by imaging a point of light is commonly known as the point spread function (PSF).7 mars 2014
Point spread function out of focus
Out-of-focus point spread functions. There are many ways in which the performance of a lens can be characterized, most of which measure properties of the in-focus image. ... The image created by imaging a point of light is commonly known as the point spread function (PSF).7 mars 2014
Peer comment(s):
| agree |
philgoddard
: I don't agree with "centered", though - that's something completely different. And Philippe's idea of "smaller" works, too.
2 hrs
|
| disagree |
Daryo
: "focused" is more the characteristic of the light beam producing a "punctual image", you can't really apply that to a "distribution function" // OTOH this PSD is always "centered" - the point is more in how small is the standard deviation.
19 hrs
|
-3
4 hrs
Johannes Gleim
Works in field
40 years Engineer, 20 years translations
Native in: German
Works in: English to German, German to English, French to German, and 6 more.
Related KudoZ points
:
2
French term (edited):
ponctuelle (ici)
anastigmatic
anastigmatic 'point-shaped'
anastigmatic
[ an-uh-stig-mat-ik, a-nas-tig- ]SHOW IPA
adjective Optics.
(of a lens) not having astigmatism; forming point images of a point object located off the axis of the lens; stigmatic.
https://www.dictionary.com/browse/anastigmatic
An anastigmat or anastigmatic lens is a photographic lens completely corrected for the three main optical aberrations: spherical aberration, coma, and astigmatism
https://en.m.wikipedia.org/wiki/Anastigmat
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Note added at 5 hrs (2021-11-30 21:49:04 GMT)
--------------------------------------------------
anastigmatic lens
QUICK REFERENCE
1. An objective lens for an optical instrument in which all aberrations, including astigmatism, are reduced greatly.
2. A spectacle lens designed to correct astigmatism. It has different radii of curvature in the vertical and horizontal planes.
https://www.oxfordreference.com/view/10.1093/oi/authority.20...
anastigmatic
[ an-uh-stig-mat-ik, a-nas-tig- ]SHOW IPA
adjective Optics.
(of a lens) not having astigmatism; forming point images of a point object located off the axis of the lens; stigmatic.
https://www.dictionary.com/browse/anastigmatic
An anastigmat or anastigmatic lens is a photographic lens completely corrected for the three main optical aberrations: spherical aberration, coma, and astigmatism
https://en.m.wikipedia.org/wiki/Anastigmat
--------------------------------------------------
Note added at 5 hrs (2021-11-30 21:49:04 GMT)
--------------------------------------------------
anastigmatic lens
QUICK REFERENCE
1. An objective lens for an optical instrument in which all aberrations, including astigmatism, are reduced greatly.
2. A spectacle lens designed to correct astigmatism. It has different radii of curvature in the vertical and horizontal planes.
https://www.oxfordreference.com/view/10.1093/oi/authority.20...
Peer comment(s):
| disagree |
Tony M
: Thats only describes one way in which the image might be 'ponctuelle', but is not the primary issue at stake here.
10 hrs
|
| disagree |
Daryo
: "anastigmatic" would describe the lenses, and even for some perfectly "anastigmatic" lenses, NOT ALL luminous points would be transformed into just a "point" on the other side of the lenses.
14 hrs
|
| disagree |
Jennifer Levey
: You're confusing cause and effect.
15 hrs
|
1 day 7 hrs
Adrian MM.
Austria
Austria
Native in English
Austria
Retd.T&I, Barrister & Austro-Advokat
Native in: English (Variants: Scottish, British) 
Works in: Spanish to English, English to Spanish, French to English, and 5 more.
French term (edited):
ponctuel
punctiform; point-perfect
One size, like one-off, doesn't fit all in this case.
'The more punctiform or point-perfect the PSF, the better the optical quality' > 'of the pinhole image'
Ponctuel: localis/zed; punctiform, FRE/ENG Dict. Gen. de la Technique Industrielle, Ernst.
'The more punctiform or point-perfect the PSF, the better the optical quality' > 'of the pinhole image'
Ponctuel: localis/zed; punctiform, FRE/ENG Dict. Gen. de la Technique Industrielle, Ernst.
Example sentence:
The ideal point spread function (PSF) is the three-dimensional diffraction pattern of light emitted from an infinitely small point source in the specimen
Upon penetration of the tissue, the incoming light, which is (approximately) punctiform, is dispersed.
Discussion
I see the opposite of this as being 'spread' — the trouble seems to me to find just the right antonym for that!
Diagnostic and Imaging Techniques in Ophthalmologyhttps://books.google.co.uk › books
Amar Agarwal, Samuel Boyd, Robert C Drews · 2011 · Medical
A tridimensional representation of the PSF is roughly shaped like a mountain peak: the higher and steeper (thinner), the better the optical quality.