Research of Digital Watermarking Based on DWT and Holography Image

Focusing on the copyright protection of digital museum image, one new method of digital watermarking combined the technology of discrete wavelet transform and digital holography is proposed. The digital watermark image is firstly changed into the digital holography image, which is the watermarking. Then the watermarking is embedded into the host image through the algorithm of DWT. The key is the wavelength of illuminating light and the distance between the object plane and the recording plan which is easy to choose. Experimental results show the watermarked image generated by the algorithm meets the requirements of invisible watermark which is robust against normal image processing and attacks.