Detecting photographic composites using shadows

  • Authors:
  • Wei Zhang;Xiaochun Cao;Jiawan Zhang;Jigui Zhu;Ping Wang

  • Affiliations:
  • School of Computer Science and Technology, Tianjin University, China;School of Computer Science and Technology, Tianjin University, China;School of Computer Science and Technology, Tianjin University, China;Tianjin University, China;Tianjin University, China

  • Venue:
  • ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
  • Year:
  • 2009

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Abstract

Image compositing technology has become popular for tampering with digital photographies. We describe how such composites can be detected by enforcing the geometric and photometric constraints from shadows. In particular, we explore (i) the imaged shadow relations that are modeled by the planar homology, and (ii) the color characteristics of the shadows measured by the shadow matte. Our approach efficiently extracts these constraints from a single image and makes use of them for the digital forgery detection. Experimental results on visually plausible images demonstrate the performance of the proposed method.