Digital Watermarking - MATLAB Source Code Collection

This collection provides MATLAB source code for various digital watermarking techniques, including Discrete Cosine Transform (DCT) and Wavelet Transform methodologies. Digital watermarking represents a sophisticated technique for embedding hidden information within images or videos, primarily utilized for copyright protection and data authentication purposes. The implementation includes key algorithms where DCT-based watermarking utilizes frequency domain embedding through coefficient modification in discrete cosine transformed blocks, while wavelet transform methods employ multi-resolution analysis for robust watermark insertion across different frequency bands. These MATLAB implementations feature core functions including image preprocessing, transformation domain selection, embedding strength optimization, and extraction algorithms. Through these comprehensive source codes, researchers and developers can effectively study and practice digital watermarking technology, gaining deeper insights into fundamental principles and practical applications of information hiding techniques while maintaining acceptable visual quality of host media.