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Wavelet-based color pathological image watermark through dynamically adjusting the embedding intensity.

Guoyan Liu¹, Hongjun Liu, Abdurahman Kadir

¹Department of Dermatology, Affiliated Hospital of Weifang Medical University, Weifang 261031, China.

Computational and Mathematical Methods in Medicine

|December 18, 2012

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This study introduces a robust blind watermarking technique for pathological images using discrete wavelet transform (DWT). The method effectively embeds and extracts watermarks, resisting common image distortions.

Area of Science:

Digital Image Processing
Medical Imaging Security
Information Hiding

Background:

Digital pathological images require secure watermarking for data integrity and authentication.
Existing watermarking schemes may lack robustness against common image processing operations.

Purpose of the Study:

To develop a dynamic and robust blind watermarking scheme for color pathological images.
To enhance the security and resilience of watermarked medical images.

Main Methods:

Utilizing discrete wavelet transform (DWT) for embedding.
Preprocessing watermark by Arnold cat map scrambling and chaotic map encryption.
Embedding into the higher frequency domain of the blue component.
Dynamically modifying wavelet coefficients based on mean and variance for threshold generation.

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Main Results:

The proposed scheme demonstrates robustness against JPEG compression, additive noise, brightening, rotation, and cropping.
Effective watermark extraction is achieved within a defined threshold range.
Dynamic threshold adjustment enhances detection accuracy.

Conclusions:

The developed blind watermarking scheme offers significant advantages in protecting pathological image data.
The technique provides a secure and reliable method for watermarking medical images, ensuring integrity against various attacks.