Image Authentication Technique Based on DCT (IATDCT)

  • Nabin Ghosal
  • Anirban Goswami
  • Jyotsna Kumar Mondal
  • Dipankar Pal
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (volume 167)

Abstract

In this paper a novel steganographic technique based on Discrete Cosine Transform (DCT) is demonstrated for image authentication in frequency domain. The transformation is implemented on sub-image block called mask of size 2 x 2 of spatial components in row major order for the entire image. Single bit of authenticating secret message/image is fabricated in the real part of the frequency component of 2nd and 3rd carrier image byte of each sub-image block. A minor re-adjustment is incorporated only in the first component of each sub image block after embedding to keep the pixel values positive and non fractional in spatial domain. Robustness is achieved through embedding secret bits in variable positions of the carrier image byte determined by random function and subsequent masking. Experimental results depict enhanced performance of the proposed watermarking technique.

Keywords

Discrete Cosine Transform Source Image Image Block Secret Data Discrete Cosine Transform Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag GmbH Berlin Heidelberg 2012

Authors and Affiliations

  • Nabin Ghosal
    • 1
  • Anirban Goswami
    • 2
  • Jyotsna Kumar Mondal
    • 3
  • Dipankar Pal
    • 4
  1. 1.Dept. of Engineering and Technological StudiesUniversity of KalyaniKalyaniIndia
  2. 2.Dept of Information TechnologyTechno IndiaKolkataIndia
  3. 3.Dept. of Computer Science and EngineeringUniversity of KalyaniKalyaniIndia
  4. 4.Dept. of Computer Science and EngineeringTechno IndiaKolkataIndia

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