  In this paper, a robust and blind watermarking method is proposed, which is
highly resistant to the common image watermarking attacks, such as noises,
compression, and image quality enhancement processing. In this method, Arnold
Cat map is used as a pre-processing on the host image, which increases the
security and imperceptibility of embedding watermark bits with a strong gain
factor. Moreover, two pseudo-noise strings with weak correlation are used as
the symbol of each 0 or 1 bit of the watermark, which increases the accuracy in
detecting the state of watermark bits at extraction phase in comparison to
using two random pseudo-noise strings. In this method, to increase the
robustness and further imperceptibility of the embedding, the Arnold Cat mapped
image is subjected to non-overlapping blocking, and then the high frequency
coefficients of the approximation sub-band of the FDCuT transform are used as
the embedding location for each block. Comparison of the proposed method with
recent robust methods under the same experimental conditions indicates the
superiority of the proposed method.
