Research on Technology of Image Watermark of Grid
网格图像水印技术的研究*

Aiming at the problem of copyright protection of digital multimedia documents in the gird environments,author proposed a meaningful digital watermarking algorithm which could be used in the gird environments.It decomposed and reconstructed a digital image using multi-resolution ratio of wavelet transform based on the discrete wavelet transform and digital spread spectrum technology.Experiments show that choosing frequency domain to embed watermarking can gain image fidelity better and have more robustness than watermarking embedded algorithm in space domain.