Digital Image Watermarking Algorithm in Region of Interest
In this paper, a novel robust image watermarking algorithm in region of interest (ROI) is proposed,which can solve the problem that the structure characteristics of host image and the interested object region is not taken into account in most existing watermarking scheme. Firstly,the ROI are extracted in DWT domain by using the human visual characteristic and K-mean clustering.Secondly,the discrete wavelet transform (DWT) is performed on the ROI. Finally, the watermark is embedded by adaptively quantizing the low-frequency wavelet coefficients according to local image characteristics.Experimental results show that the proposed algorithm is robust to compression,noise adding,sharpening and various background attacks such as background cropping,ROI moving,background changing.