A new robust and fragile watermarking scheme for images captured by mobile phone cameras

摘要

This paper deals with a watermarking scheme for images captured by mobile phone cameras. The new scheme embeds two watermarks in the images for authentication checking and copyright protection. The mobile phone number including the international code is used as the first robust watermark. The number is embedded using the discrete wavelet transform. Hash code of the image is used as a fragile watermark and inserted in the spatial domain. The scheme is blind and does not require the original image in order to extract the watermarks. The fragile watermark is very sensitive to any kind of attacks or image manipulations. On the other hand, the robust watermark causes minimal distortion to the host images. The robustness of the proposed algorithm has been tested against several attacks and it survived cropping, scaling, filtering, additive noise and JPEG compression.