DCT Coefficient-Based Video Watermark Embedding Algorithm

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Resource Overview

A video watermark embedding program based on DCT coefficients that reads YUV files, extracts multiple frames, performs DCT transformation on each frame, modifies mid-low frequency coefficient values, applies inverse DCT, and reconstructs frames into YUV format for playback.

Detailed Documentation

This text introduces a video watermark embedding program based on Discrete Cosine Transform (DCT) coefficients. The program begins by reading YUV files and extracting multiple video frames from the input stream. For each extracted frame, the system performs DCT transformation using block-based processing (typically 8x8 blocks), where mid-low frequency coefficients are strategically modified to embed watermark information. The implementation employs coefficient quantization techniques to ensure robustness while maintaining visual quality. Following the watermark embedding process, Inverse Discrete Cosine Transform (IDCT) is applied to reconstruct each frame. The modified frames are then reassembled into YUV format, preserving the original video structure while incorporating the digital watermark. This approach enables seamless watermark embedding without compromising normal video playback quality, making it suitable for copyright protection applications.

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