Performance of visual tasks from contour information

Yitzhak Yitzhaky, Liron Itan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A recently proposed visual aid for patients with a restricted visual field (tunnel vision) combines a see-through head-mounted display (HMD) and a simultaneous minified contour view of the wide field image of the environment. Such a widening of the effective visual field is helpful for tasks such as visual search, mobility and orientation. The sufficiency of contours (outlines of the objects in the image) for performing everyday visual tasks by human observers is of major importance for this application, as well as for other applications, and for basic understanding of human vision. Due to their efficient properties as good object descriptors, contours are widely used in computer vision applications, and therefore many methods have been developed for automatic extraction of them from the image. The purpose of this research is to examine and compare the use of different types of automatically created contours, and contour representations, for practical everyday visual operations using commonly observed images. The visual operations include visual searching for items such as keys, remote control, etc. Considering different recognition levels, identification of an object is distinguished from detection (when it is not clearly identified). Some new non-conventional visual-based contour representations were developed for this purpose. Experiments were performed with normal vision subjects, by superposing contours of the wide-field of the scene, over a narrow field (see-through) background. Results show that about 85% success is obtained by for searched object identification when the best contour versions are employed.

Original languageEnglish
Title of host publicationApplications of Digital Image Processing XXXIII
StatePublished - 1 Dec 2010
EventApplications of Digital Image Processing XXXIII - San Diego, CA, United States
Duration: 2 Aug 20104 Aug 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceApplications of Digital Image Processing XXXIII
Country/TerritoryUnited States
CitySan Diego, CA


  • Low vision rehabilitation
  • augmented vision
  • contour appearance
  • edge detection
  • visual search

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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