Examination of correction method to shadow in face image for iyashi expression recognition system

Toshiki Kanbayashi, Luis Diago, Tetsuko Kitaoka, Ichiro Hagiwara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In automobile industry, the research and development of ITS (Intelligent Transport Systems) is carried out leveraging technology to maximize safety as the first priority. As the fatigue and stress are easy to induce the driver to an accident, several ITS use the human facial expression to guess the driver's psychological condition. However, the detection accuracy of the facial characteristic points decreases greatly when there is a shadow on the face. The method of correcting only the shadow is not devised. This study automatically corrects the brightness of the shadow area, and improves the detection accuracy of the characteristic points. The proposed method and the method using histogram equalization were compared. A significant improvement is obtained by proposed method when the area of the shadow in the face image is 40% or less.

Original languageEnglish
Pages (from-to)28-35
Number of pages8
JournalJournal of the Institute of Image Electronics Engineers of Japan
Volume41
Issue number1
Publication statusPublished - 1 Jan 2012

Keywords

  • Correction of lightness
  • Facial expression
  • Image processing
  • Iyashi
  • Light-source direction

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