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Color Image Zero-Watermarking on DCT Domain through Comparison of Two Channels

두 채널 비교를 통한 DCT 영역 컬러 이미지 제로-워터마킹

  • 김형도 (한양사이버대학교 경영정보학과)
  • Received : 2015.05.13
  • Accepted : 2015.06.11
  • Published : 2015.09.28

Abstract

Digital watermarking provides electronic means for proving the copyrights of distributed digital media copies. Research on digital watermarking for images is recently directed toward that for color images extensively used in real life, based on the substantial results in digital watermarking for gray-scale images. Color images have multiple channels, each of which corresponds to a gray-scale image. While there are some watermarking techniques for color images that just apply those for gray-scale images to one channel of the color images, the correlation characteristics between the channels are not considered in them. This paper proposes a zero-watermarking technique that makes keys via combining an image dependent watermark, created through comparing two channels of the color image and copyright watermark scrambled. Due to zero-watermarking, it does not change anything of cover(host) images. Watermark images are robust against some common attacks such as sharpening, blurring, JPEG lossy compression, scaling, and cropping.

Keywords

Color Image;Watermarking;Zero-Watermarking;DCT

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