Information extraction from shadowed regions in images: an eye movement study

Frouke Hermens, Sunčica Zdravković

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Natural scenes often contain variations in local luminance as a result of cast shadows and illumination from different directions. When making judgments about such scenes, it may be hypothesized that darker regions (with lower relative contrast due to a lack of illumination) are avoided as they may provide less detailed information than well-illuminated areas. We here test this hypothesis, first by presenting participants images of faces that were digitally modified to simulate the effect of a shadow over half of the image, and second by presenting photographs of faces taken with side illumination, also resulting in the appearance of a shadow across half of the face. While participants viewed these images, they were asked to perform different tasks on the images, to allow for the presentation of the different versions of each image (left shadow, right shadow, no shadow), and to distract the observers from the contrast and illumination manipulations. The results confirm our hypothesis and demonstrate that observers fixate the better illuminated regions of the images.

Original languageEnglish
Pages (from-to)87-96
Number of pages10
JournalVision Research
Volume113
Issue numberPt A
DOIs
Publication statusPublished - Aug 2015
Externally publishedYes

Fingerprint

Information Storage and Retrieval
Eye Movements
Lighting

Keywords

  • Adolescent
  • Adult
  • Analysis of Variance
  • Eye Movements/physiology
  • Facial Recognition/physiology
  • Female
  • Fixation, Ocular/physiology
  • Humans
  • Judgment
  • Lighting
  • Male
  • Photic Stimulation/methods
  • Psychophysics
  • Young Adult

Cite this

Hermens, Frouke ; Zdravković, Sunčica. / Information extraction from shadowed regions in images : an eye movement study. In: Vision Research. 2015 ; Vol. 113, No. Pt A. pp. 87-96.
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title = "Information extraction from shadowed regions in images: an eye movement study",
abstract = "Natural scenes often contain variations in local luminance as a result of cast shadows and illumination from different directions. When making judgments about such scenes, it may be hypothesized that darker regions (with lower relative contrast due to a lack of illumination) are avoided as they may provide less detailed information than well-illuminated areas. We here test this hypothesis, first by presenting participants images of faces that were digitally modified to simulate the effect of a shadow over half of the image, and second by presenting photographs of faces taken with side illumination, also resulting in the appearance of a shadow across half of the face. While participants viewed these images, they were asked to perform different tasks on the images, to allow for the presentation of the different versions of each image (left shadow, right shadow, no shadow), and to distract the observers from the contrast and illumination manipulations. The results confirm our hypothesis and demonstrate that observers fixate the better illuminated regions of the images.",
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Information extraction from shadowed regions in images : an eye movement study. / Hermens, Frouke; Zdravković, Sunčica.

In: Vision Research, Vol. 113, No. Pt A, 08.2015, p. 87-96.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Information extraction from shadowed regions in images

T2 - an eye movement study

AU - Hermens, Frouke

AU - Zdravković, Sunčica

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N2 - Natural scenes often contain variations in local luminance as a result of cast shadows and illumination from different directions. When making judgments about such scenes, it may be hypothesized that darker regions (with lower relative contrast due to a lack of illumination) are avoided as they may provide less detailed information than well-illuminated areas. We here test this hypothesis, first by presenting participants images of faces that were digitally modified to simulate the effect of a shadow over half of the image, and second by presenting photographs of faces taken with side illumination, also resulting in the appearance of a shadow across half of the face. While participants viewed these images, they were asked to perform different tasks on the images, to allow for the presentation of the different versions of each image (left shadow, right shadow, no shadow), and to distract the observers from the contrast and illumination manipulations. The results confirm our hypothesis and demonstrate that observers fixate the better illuminated regions of the images.

AB - Natural scenes often contain variations in local luminance as a result of cast shadows and illumination from different directions. When making judgments about such scenes, it may be hypothesized that darker regions (with lower relative contrast due to a lack of illumination) are avoided as they may provide less detailed information than well-illuminated areas. We here test this hypothesis, first by presenting participants images of faces that were digitally modified to simulate the effect of a shadow over half of the image, and second by presenting photographs of faces taken with side illumination, also resulting in the appearance of a shadow across half of the face. While participants viewed these images, they were asked to perform different tasks on the images, to allow for the presentation of the different versions of each image (left shadow, right shadow, no shadow), and to distract the observers from the contrast and illumination manipulations. The results confirm our hypothesis and demonstrate that observers fixate the better illuminated regions of the images.

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KW - Male

KW - Photic Stimulation/methods

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