LAUSR

AbstractWith the rapid development of communication technology and multimedia technology, digital watermark has played an important role in the protection of various forms of digital media works. In this paper, digital watermarking algorithms of wavelet domain are studied. Firstly, we apply discrete wavelet transform with different levels on the host images and combine them with corresponding discrete cosine transform. Next, we introduce the spread transform quantization index modulation algorithm to implement the watermark embedding. Then, we propose orthogonal matching pursuit compression reconstruction algorithm for the watermarking algorithm to optimize the watermark extraction through denoising-attacked watermarked images. We conduct several experiments and compare performance of different algorithms using statistical parameters such as peak signal-to-noise ratio and bit error rate. The experiments and comparisons prove the effectiveness of the proposed algorithms.