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.
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Notes
- 1.
The camcorder is positioned as close to the screen as possible, and the focus is set to infinity. As a result, the screen is blurred and the image recorded through the screen holes is sufficiently clear.
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Echizen, I., Yamada, T., Gohshi, S. (2015). IR Hiding: Use of Specular Reflection for Short-Wavelength-Pass-Filter Detection to Prevent Re-recording of Screen Images. In: Shi, Y. (eds) Transactions on Data Hiding and Multimedia Security X. Lecture Notes in Computer Science(), vol 8948. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46739-8_3
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