Semi-blind robust watermarking with dual complex tree wavelet based hybrid transform and SVD

This paper presents an intelligent scheme for robust digital watermarking of image. The inherent property of perfect reconstruction of dual complex tree wavelet transform and secret transform order in fractional Hartley transform is motivation to select these transforms. These transformation in 2D are used to generate a hybrid transform. The LL-sub band of this hybrid transform is further decomposed into SVD components for embedding watermark. Only LL-band of original image is required during watermark extraction and therefore is considered as semi- blind watermarking scheme. Experimental evaluation proves that the proposed scheme is robust against variety of attacks.