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IR Hiding: Use of Specular Reflection for Short-Wavelength-Pass-Filter Detection to Prevent Re-recording of Screen Images

  • Isao EchizenEmail author
  • Takayuki Yamada
  • Seiichi Gohshi
Chapter
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8948)

Abstract

We previously proposed using infrared (IR) LEDs to corrupt recorded content to prevent the re-recording of images displayed on a screen. This method is based on the difference in sensory perception between humans and devices and prevents re-recording by adding IR noise to the images displayed on the screen without it being detected by the human eye. However, it cannot prevent re-recording using digital camcorders equipped with a short wavelength pass filter to eliminate the noise. We have now improved our method by adding a simple countermeasure against such attacks. It detects IR light reflected off the filter by using the IR specular reflection properties of the filter and thereby detects re-recording using digital camcorders equipped with a short wavelength pass filter. We implemented this countermeasure by adding one of two types of IR LEDs (bullet type and chip type with lens) to our prototype re-recording prevention system, which is installed on a B3-size screen. Testing showed that this enhanced system can detect camcorders with an attached short wavelength pass filter.

Keywords

Short wavelength pass filter Infrared cut filter Infrared absorption filter Specular reflection Infrared camcorder 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Isao Echizen
    • 1
    • 3
    Email author
  • Takayuki Yamada
    • 3
  • Seiichi Gohshi
    • 2
  1. 1.Graduate University for Advanced StudiesKanagawaJapan
  2. 2.Kogakuin UniversityTokyoJapan
  3. 3.National Institute of InformaticsTokyoJapan

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