Distinctness of image

Distinctness of image
  • See also

Visual_appearance

Distinctness of image, DOI, is a quantification of the deviation of the direction of light propagation from the regular direction by scattering during transmission or reflection. DOI is sensitive to even subtle scattering effects; the more light is being scattered out of the regular direction the more the initially sharp (well defined) image is blurred (that is, small image details are being lost). In polluted air it is the sum of all particles of various dimensions (dust, aerosols, vapor, etc.) that induces haze.

DOI is measured to characterize the visual appearance of polished high-gloss surfaces such as automotive car finishes, mirrors, beyond the capabilities of gloss.

Distinctness of Image and Blur
Blur-by-Scattering-1307-E.png
The blur induced by a scattering layer (here: frosted glass) increases with the distance between the information (ruler scaling) and the scattering layer. The scattering layer is close to the ruler surface on the left side and the distance increases to the right as does the blur. The distinctness of image decreases with increasing blur.

Other appearance phenomena are: gloss, haze, and orange peel

References

  • ASTM Standards on Color & Appearance Measurement
  • Richard S. Hunter, The Measurement of Appearance, John Wiley & Sons (1987).

External links

Instrumentation for measurement and evaluation of appearance characteristics is available from:


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Visual appearance — The visual appearance of objects is given by the way in which they reflect and transmit light. The color of objects is determined by the parts of the spectrum of (incident white) light that are reflected or transmitted without being absorbed.… …   Wikipedia

  • Matte Displays — This article describes the effect of reflections from display screens, their ergonomic effects and ways to characterize and control such reflections.From CRTs to LCDs ISO 9241 7:1998 [ISO9241 7 Ergonomic Requirements for Office Work with Visual… …   Wikipedia

  • DOI — or DoI may refer to: Doi (surname), a Japanese surname The Bengali term for Yoghurt Doi (retailer), or Camera no Doi, a Japanese company Digital object identifier, a persistent identifier given to objects United States Department of the Interior …   Wikipedia

  • Haze (disambiguation) — Haze may refer to:*Haze, the atmospheric condition * Haze (appearance), scattering of light out of the regular direction during reflection or transmission, reducing gloss, transparency and distinctness of image. *ASEAN Agreement on Transboundary… …   Wikipedia

  • Appearance — may refer to:* In physiognomy, Human physical appearance. * The visual appearance of objects is given by the way in which they reflect and transmit light. The color of objects is determined by the parts of the spectrum of light that are reflected …   Wikipedia

  • Haidinger's brush — is an entoptic phenomenon first described by Austrianphysicist Wilhelm Karl von Haidinger in 1844.Many people are able to perceive polarization of light.It may be seen as a yellowish horizontal bar or bow tie shape (with fuzzy ends, hence the… …   Wikipedia

  • philosophy, Western — Introduction       history of Western philosophy from its development among the ancient Greeks to the present.       This article has three basic purposes: (1) to provide an overview of the history of philosophy in the West, (2) to relate… …   Universalium

  • Jesus Christ — 1. Jesus (def. 1). 2. Jesus (def. 5). * * * Introduction also called  Jesus of Galilee  or  Jesus of Nazareth   born c. 6–4 BC, Bethlehem died c. AD 30, Jerusalem  founder of Christianity, one of the world s largest religions, and the incarnation …   Universalium

  • theism — theist /thee ist/, n., adj. theistic, theistical, adj. theistically, adv. /thee iz euhm/, n. 1. the belief in one God as the creator and ruler of the universe, without rejection of revelation (distinguished from deism). 2. belie …   Universalium

  • Our Lady of Guadalupe — This article is about the Mexican icon. For the Spanish icon, see Our Lady of Guadalupe, Extremadura. Our Lady of Guadalupe Location Tepeyac, Mexico City, Mexico Date …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”