A Copyright Protection Scheme for Satellite Images Using Secret Sharing and Wavelet Transform

This paper considers weather satellite images as the protected host images and proposes a novel copyright protection scheme according to the property of the images. The scheme contains two phases: the share image generation phase and the watermark retrieval phase. In the generation phase, the proposed scheme first generates a cloud image from the host image using gray-level slicing and creates a special sampling plane image from the cloud image and the host image. Next, the scheme extracts the features from the sampling plane image using the discrete wavelet transform. Then, the scheme employs the features and the watermark to generate a principal share image. In the retrieval phase, an expanded watermark is first reconstructed using the features of the suspect image and the principal share image. Next, the scheme reduces the additional noise to obtain the recovered watermark, which is then verified against the original watermark to examine the copyright. The experimental results show that the proposed scheme can resist several attacks such as JPEG compression, blurring, sharpening, scaling, and cropping.