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An RGB colour image steganography scheme using overlapping block-based pixel-value differencing.

Shiv Prasad1, Arup Kumar Pal1

  • 1Computer Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand, India.

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Summary

This study introduces a novel steganographic scheme for RGB images using pixel-value differencing (PVD). The method enhances embedding capacity by employing overlapping color component blocks for secret data embedding.

Keywords:
colour image steganographyimage securitypixel-value differencingsteganography

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Area of Science:

  • Computer Science
  • Information Security

Background:

  • Steganography conceals secret data within cover media.
  • Traditional pixel-value differencing (PVD) is challenging for RGB images due to three color components.
  • Existing methods may compromise visual quality or embedding capacity.

Purpose of the Study:

  • To propose an improved steganographic scheme for RGB color images.
  • To enhance the embedding capacity of cover images.
  • To maintain the visual integrity of stego-images.

Main Methods:

  • A novel steganographic scheme is presented for RGB color images.
  • Secret message bits are embedded using a modified pixel-value differencing (PVD) technique.
  • RGB color components are processed using two overlapping blocks (Red-Green and Green-Blue) to improve embedding capacity.

Main Results:

  • The proposed scheme successfully embeds secret data into RGB color images.
  • Satisfactory embedding capacity was achieved.
  • The visual quality of the stego-images remained acceptable.

Conclusions:

  • The modified PVD technique with overlapping blocks offers improved embedding capacity for RGB images.
  • The scheme provides a viable solution for secure data hiding in color images.
  • The balance between embedding capacity and visual quality is effectively managed.