The digital watermark technology is now drawing attention as a useful method of protecting copyrights of digital contents such as audio, image, and video. Especially, efficient image watermarking methods have been developed in the DWT (discrete wavelet transform) domain. With the rapid development of ecommerce and internet technology, the applications of multimedia products (image, video and audio, etc.) are widely spread. Meanwhile the issue on the security of the copyright has been receiving more and more attention recently. Watermarking technology is an effective way to protect digital multimedia products by embedding a watermark into the target product to prove the owners right on the product. In this paper, the digital watermarking algorithm is explained. This algorithm uses images and different types of noise are also added. The PSNR for each image is used to measure the efficacy of the algorithm. This objective measure is also used to determine the influence of the better type of noise. In summary, the results support the concept that the simpler wavelet transforms and add noise to a signal. , e.g. the Haar wavelet and add white Gaussian noise to a signal. Consistently outperform the more complex ones when using a watermark.
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