MATLAB Implementation of Various Digital Watermarking Algorithms

This MATLAB routine package implements various digital watermarking algorithms with practical code examples for reference. Digital watermarking is a crucial technology for protecting digital content security by embedding imperceptible information into digital media such as images, audio, and video files. The implementation covers both frequency-domain and spatial-domain approaches, demonstrating different algorithmic strategies. Key implementation aspects include: - Discrete Cosine Transform (DCT) based watermarking for frequency domain embedding - Least Significant Bit (LSB) substitution techniques for spatial domain operations - Robust watermarking algorithms resistant to common image processing attacks - Fragile watermarking methods for tamper detection Each algorithm is implemented with clear MATLAB functions containing detailed comments explaining the mathematical operations and embedding/extraction processes. The code demonstrates proper matrix operations for image processing, transformation functions for domain conversions, and error-handling mechanisms for robust performance. Through studying this routine collection, you will gain comprehensive understanding of digital watermarking principles and their practical applications. The package serves as valuable reference material for research projects and practical implementations, providing insights into algorithm selection, parameter optimization, and performance evaluation in MATLAB environment.