An adaptive steganography for index-based images using codeword grouping

  • Authors:
  • Chin-Chen Chang;Piyu Tsai;Min-Hui Lin

  • Affiliations:
  • National Chung-Cheng University, Chiayi, Taiwan ROC;National United University, Miaoli, Taiwan ROC;Providence University, Taichung, Taiwan ROC

  • Venue:
  • PCM'04 Proceedings of the 5th Pacific Rim conference on Advances in Multimedia Information Processing - Volume Part III
  • Year:
  • 2004

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Abstract

Hiding secret messages into index-based images is difficult because it suffers from an amount of image degradation and a limited hiding capacity. In this paper, an adaptive steganographic scheme for index-based images is proposed. The codewords are grouped into sub-clusters according to the relationship among codewords. Also, the size of the sub-cluster determines the hiding capacity of the proposed scheme. The experimental results show the performance of the proposed steganography. In comparison with the least significant bit modification method (LSB), a better stego-image quality is obtained by the proposed scheme. In comparison with Jo and Kim's and Fridrich's methods, a higher hiding capacity is provided by the proposed scheme while the near image quality remains. Furthermore, an adaptive hiding capacity is achieved by the proposed method.