A Study on Illumination Condition for Optical-digital Water Marking

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  • 光透かしにおける透かしパターンの投影条件の検討(視知覚とその応用,一般)
  • 光透かしにおける透かしパターンの投影条件の検討
  • ヒカリ スカシ ニ オケル スカシ パターン ノ トウエイ ジョウケン ノ ケントウ

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Abstract

This paper describes the degree of invisibility in optical-digital watermarking that we propose to prevent the illegal use of captured images of objects such as paintings in museums. As it uses illumination that contains watermarking to illuminate an object, a photograph of the object also contains watermarking. The key to this technique is to make watermarking invisible when it is projected onto objects. We conducted a subjective test where optical images of watermarking produced by discrete-cosine and Hadamard transforms were projected onto the printed image. The results from the test demonstrated that we could make the watermarking pattern invisible in a practical situation where we applied this technique although this depended on the contrast in the pattern. We also confirmed our technique was feasible.

Journal

  • ITE Technical Report

    ITE Technical Report 33.45 (0), 11-14, 2009

    The Institute of Image Information and Television Engineers

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