DCT Digital Image Watermarking Algorithm with Source Code Implementation

This document provides the complete source code implementation of the DCT (Discrete Cosine Transform) digital image watermarking algorithm. The code implements both watermark embedding and extraction functionalities. The algorithm employs DCT transformation to embed watermark information into the frequency domain of images, achieving lossless watermark processing. Key implementation features include: - DCT coefficient modification for watermark embedding in selected frequency bands - Inverse DCT transformation for watermark extraction - Robust embedding strategy that maintains image quality while ensuring watermark durability Through this algorithm, users can embed personalized watermark information into images to protect copyright and establish ownership. The watermark extraction process is straightforward, requiring only inverse transformation of the watermarked image to recover the embedded information. This algorithm has broad application prospects in digital image processing, particularly in copyright protection, authentication systems, and digital rights management. The implementation includes optimized functions for handling various image formats and watermark patterns, making it suitable for practical deployment in image security applications. By utilizing this algorithm, users can effectively safeguard their creative works and enhance information security.