Cryptographic computer generated hologram watermarking technology based on DWT-SVD
Songxiao Liu,
Nana Yu,
Xiangxiang Ji
et al.
Abstract:To improve the security and invisibility of image encryption and concealment, an encrypted computer generated hologram (CGH) watermarking technology based on discrete wavelet transform (DWT) and singular value decomposition (SVD) is proposed. Firstly, the image to be encrypted is encoded and converted into a binary real-valued CGH. The encrypted CGH is then embedded into the host image as a watermark, implementing image encryption and concealment. During decryption, the encrypted CGH watermark is first extract… Show more
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