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Aspect ratio invariant visual cryptography by image filtering and resizing

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Abstract

In visual cryptographic scheme (VCS), each secret pixel is expanded to m subpixels in shadow images to encrypt a secret image. Apparently, we should put these m subpixels as a rectangle such that the blocks can be arranged compactly with each other. However, if the aspect ratio is viewed as important information of the secret image, the distortion occurs at the case that m is not a square. An aspect ratio invariant VCS (ARIVCS) was accordingly proposed to address the arrangement of subpixels. However, the existing ARIVCSs relied on adding dummy subpixels to the shadow images. In addition, their method needs a mapping pattern that reduces the number of dummy subpixels, but how to design a mapping pattern is a huge challenge. In this paper, we propose an easy solution to construct ARIVCS by image filtering and resizing.

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Acknowledgments

This work was supported in part by Testbed@TWISC, National Science Council under the Grants NSC 100-2219-E-006-001.

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Authors and Affiliations

  1. Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien, Taiwan

    Ching-Nung Yang, Pin-Wei Chen & Hsiang-Wen Shih

  2. Department of Computer Engineering, Sejong University, Seoul, Korea

    Cheonshik Kim

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  1. Ching-Nung Yang
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  2. Pin-Wei Chen
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  3. Hsiang-Wen Shih
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Correspondence to Ching-Nung Yang.

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Yang, CN., Chen, PW., Shih, HW. et al. Aspect ratio invariant visual cryptography by image filtering and resizing. Pers Ubiquit Comput 17, 843–850 (2013). https://doi.org/10.1007/s00779-012-0535-0

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