Media-art employing virtual shadows with shape recognition

Sunao Hashimoto, Joo Kooi Tan, Hyoungseop Kim, Seiji Ishikawa

Research output: Contribution to journalArticle

2 Citations (Scopus)


This paper proposes an interactive computer system which creates 'virtual shadows'. A shadow, a familiar physical phenomenon, is a media which has the shape and motion information of an object. The color of a shadow is usually black, and a shadow has almost the same shape and motion as its owner. If the shadow is colorful, and it has motion different from the owner, it might give us surprise and even fantastic impression, and might catch our attention. The developed system realizes such phenomena by using the technique of computer vision. A virtual shadow is created by a projector system employing the extraction of a human from camera images. The developed system performs image recognition. The posture of a person or the shape of an object is recognized, and various video effects are given to the virtual shadow based on the result of the recognition. By using the shape recognition method which has its own data base, a specific compound shape can be recognized, and it is possible to build various kinds of interaction in the system. The proposed technique may have application to entertainment or to advertising medium.

Original languageEnglish
Pages (from-to)601-607
Number of pages7
JournalInternational Journal of Innovative Computing, Information and Control
Issue number3
Publication statusPublished - 1 Mar 2009


  • Media-art
  • Projector-camera system
  • Shape recognition
  • Virtual shadow

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