Renowned Cox Digital Watermarking Algorithm Implementation

This repository contains the well-known Cox digital watermarking algorithm implemented in MATLAB, providing a powerful tool for digital content protection. The algorithm operates by embedding and extracting watermarks in digital images and audio through discrete cosine transform (DCT) coefficient modification in frequency domains. Key functions include watermark embedding using perceptually significant coefficients and extraction through correlation detection. The implementation maintains original data quality while hiding information through strategic coefficient selection and scaling factors. This approach enables embedding unique identifiers or authentication data without noticeable degradation, making it invaluable for digital rights management and content verification. The code structure includes modular components for preprocessing, DCT transformation, coefficient selection, and watermark recovery algorithms. For digital content creators and providers, this implementation offers reliable protection mechanisms through its robust statistical watermark detection methodology and perceptual transparency features.