Digital Watermarking Algorithm Based on Wavelet Transform

The work is focused on the key techniques of digital watermarking for images, which include robustness and invisibility. In this paper, we propose a novel digital watermarking algorithm based on wavelet transform which employs the Arnold transformation to scramble watermarking. It embeds watermark into mid-frequency sub-band of original image discrete wavelet transform and adjusts the embedding strength adaptively with the property of human visual system. Experimental results demonstrate that the proposed algorithm has good robustness.