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REFLECTANCE DIFFERENCE [5 records]

Record 1 2016-09-30

English

Subject field(s)
  • Remote Sensing
  • Search and Rescue (Aircraft)
CONT

The first step in developing efficient and accurate algorithms for detecting skin in a hyperspectral image is understanding its reflectance properties. This article describes a simple model based on the layers and makeup of skin and how it absorbs and scatters light. Based on the insights gained from the modeled skin reflectance, we develop an efficient skin detection algorithm called the normalized difference skin index(NDSI), motivated by the normalized difference vegetation index(NDVI).

French

Domaine(s)
  • Télédétection
  • Recherches et sauvetages (Aviation)

Spanish

Save record 1

Record 2 - external organization data 2012-09-11

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
02.02.20 (19762)
ISO/IEC standard entry number
DEF

measure of the relative difference between the reflectance of light and dark elements

OBS

cf. reflectance difference(02. 02. 11)

OBS

PCS = (RL-RD)/RL, where RL and RD are the reflectance of light and dark elements, respectively.

OBS

print contrast signal; PCS: term, abbreviation and definition standardized by ISO/IEC [ISO/IEC 19762-2:2008].

French

Spanish

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Record 3 - external organization data 2009-08-04

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
02.02.11 (19762)
ISO/IEC standard entry number
DEF

difference between the reflectance of light and dark elements of a bar code symbol

OBS

reflectance difference : term and definition standardized by ISO/IEC [ISO/IEC 19762-2 : 2008].

French

Spanish

Save record 3

Record 4 2003-04-02

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Heat (Physics)
  • Plant and Crop Production
  • Remote Sensing
CONT

The Photochemical Reflectance Index: An optical indicator of photosynthetic radiation use efficiency across species, functional types, and nutrient levels ...

CONT

... a new suite of indices have been developed that exploits narrow band spectroradiometric data. The physiological reflectance index (PRI) introduced by Gamon et al. (1992) follows the form of equation 1 and is based on reflectances at 531 nm (band 1) and 570 nm (band 2) wavelengths. Gamon et al. (1997) renamed this the photochemical reflectance index and suggested that the index was a good predictor of photosynthetic radiation use efficiency at the leaf or canopy level, if the canopy is uniform and completely covers the soil background. The index has not shown sensitivity to nutrient stress, but it is affected by water stress with severe wilting ...

CONT

Heating treatments increase aboveground net primary production(detectable via the Normalized Difference Vegetation Index, a measure of green biomass) and enhance gross photosynthesis(detectable via the Photochemical Reflectance Index, a measure of xanthophyll cycle pigment activity and relative photosynthetic rate).... Heating enhanced the Photochemical Reflectance Index(PRI) slightly relative to that of controls. This enhancement was most visible near noon, and relaxed by 3 : 00 pm..., suggesting that this effect was a temporally dynamic one reflecting altered physiological activity towards midday.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Chaleur (Physique)
  • Cultures (Agriculture)
  • Télédétection
CONT

Dans le but d'évaluer la possibilité de mesurer les indices de vigueur des forêts à partir de la réflectance spectrale foliaire, [...] Nous avons mesuré la réflectance des pousses des sapins baumiers de chacun des traitements en laboratoire au moyen d'un spectroradiomètre portatif dont la gamme spectrale s'étendait de 350 nm à 2 500 nm. [...] La plupart des gammes d'ondes ont révélé que les traitements avaient eu des effets marqués, et les gammes d'ondes les plus significatives se trouvaient dans la région d'absorption de la chlorophylle entre 500 nm et 740 nm. [...] Les traitements ont influé sur les indices de réflectance, qui sont définis comme le rapport et l'écart normalisé entre la gamme d'ondes la plus significative à 711 nm et la gamme d'ondes la moins significative à 913 nm (P < 0,0001).

CONT

[...] nous avons montré que les variations de l'indice de réflectance PRI (physiological reflectance index) étaient liées aux mécanismes de dissipation thermique de l'excès d'énergie absorbée par la végétation et pouvaient être appliquées à la détection du stress hydrique chez la vigne.

CONT

Des mesures prises au radiomètre sur les tertres de la Butte aux Pierres permettront [...] de coupler les longueurs d'ondes obtenues au sol avec celles du satellite Spot - dont nous utilisons les «images» pour repérer les tertres sablo-terreux en contexte marécageux, et ce grâce aux indices de réflectance distincts selon les qualités de terrain analysées par le biais de l'informatique.

Spanish

Save record 4

Record 5 1997-12-23

English

Subject field(s)
  • Plastics Manufacturing
  • Ceramics (Industries)
DEF

A visible line in a moulding in the direction of, and caused by, flow. [Definition standardized by ISO.]

DEF

One or more ceramic streaks distinguished by a difference in light reflectance from the surrounding area, characteristic of injection-molded parts.

OBS

flow line: term standardized by ISO.

French

Domaine(s)
  • Plasturgie
  • Céramique (Industries)
DEF

Ligne visible sur un objet moulé, orientée dans la direction de l'écoulement et provoquée par celui-ci. [Définition normalisée par l'ISO.]

OBS

ligne d'écoulement; ligne de coulée : termes normalisés par l'ISO.

Spanish

Save record 5

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