An efficient multi-level encryption scheme for stereoscopic medical images based on coupled chaotic system and Otsu...

Area of Science:

• Medical Imaging
• Cryptography
• Image Processing

Background:

• Stereoscopic medical images require secure transmission and storage.
• Existing encryption methods may lack efficiency or robustness for medical data.

Purpose of the Study:

• To propose an efficient multi-level encryption scheme for stereoscopic medical images.
• To develop a robust watermarking algorithm for embedding doctor-patient information.

Main Methods:

• Utilizing coupled chaotic systems for encryption and Otsu threshold segmentation to divide images.
• Implementing a watermarking algorithm based on Meyer wavelet transform and singular value decomposition.
• Discarding background areas to improve encryption efficiency by approximately 40%.

Main Results:

• The proposed coupled chaotic system exhibits superior ergodicity and randomness (NIST SP800-22 test data > 0.01).
• Encryption achieves high sensitivity (NPCR ~99.6094%) and key sensitivity (UACI ~33.4635%).
• The watermarking algorithm successfully embeds 2D barcode information in regions of interest, demonstrating robustness to noise and clipping.

Conclusions:

• The proposed scheme offers efficient and secure encryption for stereoscopic medical images.
• The integrated watermarking ensures data integrity and authenticity.
• The method provides strong resistance to various attacks, suitable for clinical applications.