Reversible Digital Watermarking for Image Integrity Authentication

This MATLAB source file implements image integrity authentication using reversible digital watermarking based on differential histogram shifting. The technique protects image integrity and verifies whether an image has been tampered with. By embedding digital watermarks into the image through histogram modification of pixel difference values, the algorithm enables detection of any modifications during subsequent verification processes, ensuring image authenticity and reliability. Key implementation features include: - Pixel difference calculation between adjacent pixels - Histogram bin shifting for watermark embedding - Capacity optimization through dynamic bin selection - Tamper detection via watermark extraction and comparison - Lossless image recovery after verification This method serves as an effective security measure applicable to various domains such as digital copyright protection and information security. The reversible nature allows complete restoration of original images after authentication, making it suitable for medical imaging and legal evidence preservation where data integrity is critical.