Watermarking Algorithm for Digital Grid Map Based on Integer Wavelet Transformation

We proposed a new watermarking algorithm for the digital grid map based on integer wavelets transformation.The digital grid map was decomposed by integer wavelets transformation firstly.Then the watermark was embedded into low frequency section and high frequency section respectively.The watermark was adaptively embedded into low frequency section according to the luminance,and embedded into part of high frequency section as well.Which is selected by the characteristics of human visual systems and the intrinsic relations of wavelet coefficients.The experiments show that the proposed algorithm is robust against various vicious attacks such as JPEG compression,sharpening,cutting.