DCT-Based Digital Video Watermarking

This MATLAB-based source code implements digital video watermarking using Discrete Cosine Transform (DCT) methodology. The program features a complete video processing pipeline that includes frame-by-frame analysis, DCT coefficient manipulation for watermark embedding, and inverse transformation to reconstruct the watermarked video. Key functions handle video I/O operations, frame extraction, DCT computation using built-in MATLAB functions, and intelligent watermark insertion in mid-frequency DCT coefficients to balance visibility and robustness. The implementation allows users to embed watermarks into video content effectively while maintaining video quality and clarity through optimized quantization parameter selection. The algorithm operates by dividing each video frame into 8x8 blocks, applying DCT transformation, and modifying specific frequency components to embed watermark information. This approach ensures copyright protection and content integrity verification without significant visual degradation. Suitable for both personal and commercial applications, this source code provides a straightforward yet powerful solution for digital video protection. The modular code structure includes configurable parameters for watermark strength, block size selection, and embedding positions, allowing customization based on specific requirements. The program outputs the watermarked video file with embedded copyright information that can be detected using corresponding extraction algorithms.