earticle

영어

In this paper, we propose a blind watermarking scheme based on dual transform domains of discrete wavelet transform and discrete fractional random transform. In order to achieve the robustness and security, we also use the visual secret sharing scheme to split the secret image into two shares and use hologram quantization to spread the watermark information and analyze the cover image detail. For the purpose of widely practical application, we use a QR code for the watermark information. The QR code is decomposed into two shares, the first share is generated by the random seed, and the second share is generated with the help of secret image and the first share. Firstly, the two shares are respectively transformed into a hologram by using the hologram quantization, and then a discrete fractional random transform is applied to them. The cover image is decomposed by two-dimension discrete wavelet transform. The subband generated watermark then is embedded into the intermediate frequency components of the cover image. The watermark extraction process is the reverse of the embedding process. Because of the spectrum characteristic and tear resistant of the hologram, the algorithm has good invisibility. The experimental results show that the proposed algorithm is effective and robust against JPEG loss compression, cropping, rotation and noise.