scholarly journals Retinex-Based Perceptual Contrast Enhancement in Images Using Luminance Adaptation

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 61277-61286 ◽  
Author(s):  
Qingtao Fu ◽  
Cheolkon Jung ◽  
Kaiqiang Xu
Keyword(s):  
Contrast Enhancement ◽  
Perceptual Contrast

Perceptual contrast enhancement in visual rendering of astrophotographs

2017 ◽  
Vol 26 (3) ◽  
pp. 031205 ◽  
Author(s):  
Daniele L. R. Marini ◽  
Cristian Bonanomi ◽  
Alessandro Rizzi
Keyword(s):  
Contrast Enhancement ◽  
Perceptual Contrast

scholarly journals Ideal-observer models of perceptual contrast enhancement

2013 ◽  
Vol 14 (S1) ◽  
Author(s):  
Jonathan Platkiewicz ◽  
Hannah Michalska ◽  
Vincent Hayward
Keyword(s):  
Contrast Enhancement ◽  
Ideal Observer ◽  
Perceptual Contrast

Contrast enhancement as motivation for closed syllable laxing and open syllable tensing

Phonology ◽  
2019 ◽  
Vol 36 (2) ◽  
pp. 303-340
Author(s):  
Benjamin Storme
Keyword(s):  
Contrast Enhancement ◽  
Linguistic Variation ◽  
Perceptual Cues ◽  
Place Of Articulation ◽  
Perceptual Contrast

This paper proposes that closed syllable laxing and open syllable tensing of non-low vowels are motivated by conflicting strategies of contrast enhancement in vowel–consonant sequences. Laxing enhances the distinctiveness of consonant contrasts by allowing for more distinct VC formant transitions, in particular in sequences involving a non-low vowel followed by an oral labial/coronal/velar consonant (e.g. [p t k]). Tensing enhances the distinctiveness of vowel contrasts by providing more distinct formant realisations for vowels. Linguistic variation results from different ways of resolving the tension between maximising vowel dispersion and maximising consonant dispersion. Laxing typically applies before coda consonants as a way to compensate for the absence of good perceptual cues to place of articulation. The hypothesis that laxing enhances the distinctiveness of postvocalic place contrasts is supported by a study of mid-vowel laxing in French, which corroborates the general claim that perceptual contrast plays a role in shaping phonotactic restrictions.

scholarly journals Perceptual contrast enhancement with dynamic range adjustment

Optik ◽  
2013 ◽  
Vol 124 (23) ◽  
pp. 5906-5913 ◽  
Author(s):  
Hong Zhang ◽  
Yuecheng Li ◽  
Hao Chen ◽  
Ding Yuan ◽  
Mingui Sun
Keyword(s):  
Contrast Enhancement ◽  
Dynamic Range ◽  
Perceptual Contrast

scholarly journals Hue-preserving perceptual contrast enhancement

2016 ◽  
Author(s):  
Fabien Pierre ◽  
Jean-Francois Aujol ◽  
Aurelie Bugeau ◽  
Gabriele Steidl ◽  
Vinh-Thong Ta
Keyword(s):  
Contrast Enhancement ◽  
Perceptual Contrast

An Energy Analyser for Contrast Enhancement in STEM

1974 ◽  
Vol 32 ◽  
pp. 434-435
Author(s):  
H.T. Pearce-Percy
Keyword(s):  
Contrast Enhancement ◽  
Bending Angle ◽  
Magnetic Sector ◽  
Conventional Design ◽  
Bending Radius ◽  
Sector Type

Recently an energy analyser of the uniform magnetic sector type has been installd in a 100KV microscope. This microscope can be used in the STEM mode. The sector is of conventional design (Fig. 1). The bending angle was chosen to be 90° for ease of construction. The bending radius (ρ) is 20 cm. and the object and image distances are 42.5 cm. and 30.0 cm. respectively.

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