Research on Digital Watermarking Algorithm Based on Discrete Cosine Transform

Digital image watermark technology plays a very critical role in the fields of copyright maintenance and information dissemination. This paper proposes discrete cosine transform digital watermark algorithm based on the frequency domain digital watermark image of watermark algorithm and human visual features of digital watermark algorithm. The watermark image loading, pretreatment, embedding, extraction, and attack of the dynamic watermark test is realized, and the block embedded watermark information is reached. The algorithm is to combine the DCT block method and the experiment result shows good robustness features, contribute to copyright information protection.