A colour image copyright protection scheme based on visual cryptography and discrete cosine transform

C. C. Chang, J. Y. Hsiao, J. C. Yeh

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

In this paper, a copyright protection scheme based on visual cryptography and discrete cosine transform for colour images is proposed. Note that the watermark emphasized here is a colour watermark. Instead of hiding a watermark in a colour image for identifying the ownership of the image, all that is required is to construct an ownership share according to a master share created from the colour image by applying discrete cosine transform plus a watermark used for copyright certification. By stacking the master share and the ownership share together, the watermark for ownership identification can be revealed through the utilization of visual cryptography plus a little additional computation. Additionally, the present scheme is also extremely suitable for multiple watermarking. The security of this scheme can be guaranteed via a pseudo random mechanism and the feature of visual cryptography. With substantial experimental results, the robustness of this scheme can be demonstrated against various image processing attacks.

Original languageEnglish
Pages (from-to)133-140
Number of pages8
JournalImaging Science Journal
Volume50
Issue number3
DOIs
Publication statusPublished - 2002 Jan 1

All Science Journal Classification (ASJC) codes

  • Media Technology
  • Computer Vision and Pattern Recognition

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