An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 25 Search : image
blurred image
  تصویر ِ تار، ~ ِ ناتیگ   
tasvir-e târ, ~ nâtig

Fr.: image estompée, ~ floue   

An image which is dim, indistinct, or vague in appearance, for instance when the optics is not well-focused or when the seeing is poor. The same as → unsharp image, contrary to → sharp image.

Blurred, p.p. of → blur; → image.

co-added image
  تصویر ِ هم‌افزوده   
tasvir-e hamafzudé

Fr.: image intégrée   

An image made up of several individual images of relatively short exposure times which are added together in order to produce a final image of higher quality.

Co-added, from → co- "together" + added p.p. of → add; → image.

Tasvir, → image; hamafzudé from ham- "together", → com-, + afzudé p.p. of afzudan, → add.

deep image
  تصویر ِ ژرف   
tasvir-e žarf

Fr.: image profonde   

An image obtained using a deep exposure to reveal the weak features of the object.

deep; → image.

differential image motion monitor (DIMM)
  پهره‌گر ِ جنبش ِ دگرسانه‌ای ِ تصویر   
pahregar-e jonbeš-e degarsâneyi-ye tasvir

Fr.: moniteur de mouvements d'images différentiels, moniteur seeing   

A device that is commonly used to measure the → seeing at optical astronomical sites. The DIMM delivers an estimate of the → Fried parameter based on measuring the variance of the differential image motion in two small apertures, usually cut out in a single larger telescope pupil by a mask. The DIMM concept was introduced by Stock & Keller (1960, in Stars and Stellar Systems, Vol. 1, ed. G. P. Kuiper & B. M. Middlehurst, p. 138), whereas its modern implementation was first described by Sarazin & Roddier (1990, A&A 227, 294).

differential; → image; → motion; → monitor.

fuzzy image
  تصویر ِ پرزوار   
tasvir-e porzvâr

Fr.: image floue, ~ estompée   

Same as → blurred image.

fuzzy; → image.

image
  تصویر   
tasvir (#)

Fr.: image   

In an optical system, the point to which light rays are converged (real image) or from which they appear to diverge (virtual image) after reflection or refraction.
Math.: A number, point, or unique element of a space that corresponds to some other number, point, or unit element.

From O.Fr. image, from L. imaginem (nom. imago) "copy, picture, likeness " from stem of imitari "to copy, imitate," from im-, stem of imitare "to copy, imitate" + -ago noun suffix.

Tasvir, loan from Ar.

image co-adding
  هم‌افزایش ِ تصویرها   
hamafzâyeš-e tasvirhâ

Fr.: addition d'images   

The process of adding several usually low-exposure images to create an image having a significantly higher signal/noise ratio.

image; → co-; → add.

image deblurring
  تیگش ِ تصویر   
tigeš-e tasvir

Fr.: correction de l'image brouillée   

A technique using a mathematical model of the blurring process to recover the original, sharp image. See also → blurred image.

image; → deburring.

image formation
  دیسش ِ تصویر   
diseš-e tasvir

Fr.: formation de l'image   

The meeting of light rays emanating from an object after crossing an optical system.

image; → formation.

image intensifier
  تنوگر ِ تصویر   
tanugar-e tasvir

Fr.: intensificateur d'image   

Device that produces an observable image that is brighter at output than the image at input.

image; → intensifier.

image plane
  هامن ِ تصویر   
hâmon-e tasvir

Fr.: plan d'image   

The plane in which is formed an image produced by an → optical system.

image; → plane.

image point
  نقطه‌ی ِ تصویر   
noqte-ye tasvir

Fr.: point image   

One of the points constituting an extended image formed in an → optical system.

image; → point.

image processing
  آمایش ِ تصویر   
âmâyeš-e tasvir

Fr.: traitement d'image   

The use of techniques to produce, extract, identify, and display images for evaluation, interpretation, and further interaction with the data.

image; → processing.

image quality
  چونی ِ تصویر   
cuni-ye tasvir

Fr.: qualité d'image   

1) The degree of visibility of relevant → information in an image.
2) The → full-width at half-maximum of a long exposure stellar image obtained by an instrument mounted on a telescope observing in the presence of → seeing.

image; → quality.

image resolution
  واگشود ِ تصویر   
vâgošud-e tasvir

Fr.: résolution d'image   

The separation between two detached but adjacent points in an image.

image; → resolution.

image restoration
  بازسازی ِ تصویر   
bâzsâzi-ye tasvir (#)

Fr.: restauration d'image   

The process by virtue of which the original image can be created by removing the blurring and the noise that occur during image formation.

image; → restoration.

image scale
  مرپل ِ تصویر   
marpel-e tasvir

Fr.: échelle de l'image   

The quantity that relates the length on the image to the angular or physical separations on the sky.

image; → scale.

image space
  فضای ِ تصویر   
fazâ-ye tasvir

Fr.: espace image   

In an → optical system, the space defined by the totality of → image points. The corresponding points in image space and → object space are called → conjugate points.

image; → space.

image tube
  لوله‌ی ِ تصویرگر   
lule-ye tasvigar

Fr.: tube imageur   

A device for amplifying faint images by electronic means. Electrons, released when the incident radiation forms a pattern on a photocathode, are accelerated by a magnetic field so that they form a second, brighter image when they strike a phosphor screen.

image; → tube.

real image
  تصویر ِ هسیا   
tasvir-e hasyâ

Fr.: image réelle   

In an optical system, the image of an object produced by the convergence of the light rays that make up the image. → virtual image; → real object.

real; → image.

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