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seuil de contraste

contrast threshold

sciences naturelles et appliquées / santé - iate.europa.eu

A partir de cette information image, on détermine des sections d'image qui présentent un contraste qui est supérieur à un seuil de contraste prédéterminé.

Those image segments comprising a contrast greater than a predetermined contrast threshold are determined from the image information.

informatique et traitement des données - wipo.int

Plus un seuil de contraste est bas, plus un objet est facile à détecter.

The lower the contrast threshold the easier it is to detect an object.

général - CCMatrix (Wikipedia + CommonCrawl)

Des instructions de suggestion de police de caractères déterminent un seuil de contraste de frappe, qui peut être utilisé pour décider si l'on doit préserver ou omettre le contraste de frappe au moment de la restitution de glyphe.

Font hinting instructions determine a stroke contrast threshold, which may be used to decide whether to preserve or omit stroke contrast when rendering the glyph.

informatique et traitement des données - wipo.int

S'il est déterminé que l'intensité maximale du signal d'interférence est inférieure / est inférieure ou égale au seuil de contraste prédéfini, la couche où se situe le terminal d'utilisateur est déterminée en fonction du seuil d'interférence prédéfini.

If it is judged that the maximum interference signal intensity is less than/is less than or equals to the pre-defined contrast threshold, the layer that the user terminal locates in is determined according to the pre-defined interference threshold.

électronique et électrotechnique - wipo.int

La BS reçoit l'intensité maximale actuelle du signal d'interférence signalée par le terminal d'utilisateur et effectue une détermination en fonction d'un seuil de contraste prédéfini.

The BS receives the current maximum interference signal intensity reported by the user terminal and performs the judgment according to a pre-defined contrast threshold.

électronique et électrotechnique - wipo.int

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Les canaux de fréquence spatiale sont-ils susceptibles de s'adapter ?

... Le seuil temporel de détection d'une trame varie lui aussi en fonction de la fréquence spatiale selon une fonction vraisemblablement similaire à celle du seuil de contraste (fonction de transfert de modulation).Goréa...

... It is also suggested that the temporal threshold for the detection of one grating depends on its Spatial Frequency in a similar manner as the contrast threshold depends on it (modulation transfer function).

général - core.ac.uk -

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Stroboscopic effect: contrast threshold function and dependence on illumination level... A power function is fitted through the aggregated results to develop a stroboscopic effect contrast threshold function for a “standard observer,” which can be used to normalize SVM....

général - core.ac.uk - PDF: www.loc.gov

Relationship between visual field loss and contrast threshold elevation in glaucomaAbstract Background There is a considerable body of literature which indicates that contrast thresholds for the detection of sinusoidal grating patterns are abnormally high in glaucoma, though just how these elevations are related to the location of visual field...

PDF: doaj.org

Effects of static and dynamic image noise and background luminance on letter contrast thresholdWe performed a pilot psychovisual experiment to determine the contrast threshold and slope of the psychometric function for a target embedded in two levels of static and dynamic external image noise....

PDF: biblio.ugent.be

seuil de contraste

threshold contrast

sciences naturelles et appliquées - iate.europa.eu

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Contrast facilitation in motion detection: evidence for a reichardt detector in human vision ... The threshold contrast for the first frame was determined for a range of contrasts of the second frame....

général - core.ac.uk -

Visibility of aperiodic patterns compared with that of sinusoidal gratings... Using experimental curves relating the threshold contrast of sinusoidal grating patterns to their spatial frequency, the expected threshold contrast curves for three aperiodic patterns, viz....

PDF: www.pubmedcentral.nih.gov

Suprathreshold vision in acute optic neuritis.The perception of contrast was measured in patients with acute unilateral optic neuritis by a technique of subjective suprathreshold contrast matching, and was compared with contrast sensitivity as defined by threshold measurements....

PDF: www.pubmedcentral.nih.gov

Contrast sensitivity functions.... Data points represent the mean of the threshold contrast at each spatial frequency for all eyes tested in each group (BCM carriers, n = 10; Controls, n = 20)....

PDF: figshare.com

The threshold contrast thickness evaluated with different cdmam phantoms and software... The European Commission recommends the CDMAM phantom as a tool to evaluate threshold contrast visibility in digital mammography [1, 2]....

PDF: doaj.org

luminance contrast threshold

santé - iate.europa.eu

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Deep brain stimulation of the pedunculopontine tegmental nucleus (ppn) influences visual contrast sensitivity in human observers.... Here we address this possibility by measuring the visual discrimination performance (luminance contrast thresholds) in a group of patients with Parkinson's Disease (PD) treated with deep-brain stimulation (DBS) of the PPN to control gait and postural motor deficits....

général - core.ac.uk - PDF: doaj.org

Contrast salience across three-dimensional chromoluminance space ... We find that: (i) observers can reliably match the perceptual contrast of gratings differing in chromoluminance irrespective of whether they lie along canonical axes or intermediate axes; (ii) the relative perceptual contrast of gratings in the isoluminant plane correlates well with a metric based on an ideal observer but added luminance results in a perceptual contrast lower than would be predicted by this model; (iii) contrast matches in the isoluminant plane can be modeled by simple combinations of the cone contrasts for the LM and S pathways; (iv) unipolar, non-opponent, mechanisms may subserve the perception of contrast; and (v) the relative salience of suprathreshold chromatic gratings varies in accord with contrast thresholds but the low spatial frequency increase in luminance contrast threshold is not manifest in a reduced suprathreshold salience for luminance gratings

Infant luminance and chromatic contrast sensitivity: optokinetic nystagmus data on 3-month-olds ... The infant chromatic-to-luminance contrast threshold ratio shows that infants are as sensitive or even more sensitive than adults to color, depending on the testing method used on adults....

Influence of spatial and chromatic noise on luminance discrimination... In this current study estimate of luminance contrast thresholds were conducted using a novel stimulus, based on the use of chromatic and spatial noise to mask the use of these cues in a luminance discrimination...

PDF: doaj.org

Key words：disability glare, road lighting system, luminance contrast threshold... To test the disability glare, an indoor laboratory was constructed and a variation of luminance contrast threshold was evaluated....

PDF: ocean.kisti.re.kr