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Reversible watermarking for authentication of DICOM images
J M Zain1, L P Baldwin, M Clarke
1Department of Information Systems and Computing, Brunel University, Uxbridge UB8 3PH, United Kingdom.
Summary
A novel watermarking scheme embeds image integrity data in ultrasound images. This method allows for the recovery of original DICOM images, ensuring authenticity and detecting alterations.
Area of Science:
- Medical Imaging
- Digital Watermarking
- Image Forensics
Background:
- Digital medical images, particularly DICOM, require robust integrity verification.
- Existing methods may not adequately preserve image data or allow for full recovery.
- Ultrasound (US) imaging generates large datasets where authenticity is critical.
Purpose of the Study:
- To develop a novel watermarking scheme for DICOM images.
- To ensure the integrity and authenticity of ultrasound images.
- To enable the recovery of the original image from a watermarked version.
Main Methods:
- Embedding SHA-256 hash of the image into the least significant bits (LSBs) of the Region of Non-Interest (RONI).
- Utilizing 800x600x8 bits ultrasound images for experimental validation.
- Implementing a watermarking process that allows for original image reconstruction.
Main Results:
- Successful embedding and extraction of watermarks in US images.
- Demonstrated recovery of the original image from the watermarked version.
- Verification of image integrity through SHA-256 comparison.
Conclusions:
- The proposed watermarking scheme effectively verifies DICOM image integrity and authenticity.
- The method allows for the complete recovery of original ultrasound images.
- This technique enhances the trustworthiness of medical imaging data.
