Abstract: Image watermarking is a technology that embeds specific information into the carrier image for the purpose of copyright protection.A new image watermarking scheme based on quantum wavelet transform is studied,including scrambling process,embedding process and extraction process.The improved quantum Arnold scrambling method is used to scramble the binary image.The scrambled watermark image is applied to the least effective block qubit of the carrier image.For the carrier gray image,the quantum Haar wavelet transform and quantum least significant bit(LSB) blocking technology are used to embed the scrambled watermark image into the quantum wavelet coefficient.In the extraction process,firstly,the scrambled watermark image is extracted from the embedded image,and then the improved quantum Arnold inverse scrambling method is used to obtain the original watermark image.Simulation technology verifies the invisibility and high robustness of the watermark based on the quantum image watermarking method.The invisibility of the scheme is proved by peak signal-to-noise ratio(PSNR) test.The high robustness of the scheme is tested by bit error rate(BER) test and normalized correlation coefficient(NC).Simulation results show that the watermarking scheme not only has acceptable visual quality,but also has good resistance to different types of attacks.

Key words: Quantum wavelet transform, Image watermarking, Scrambling, Quantum least significant bit blocking, Invisibility, Robustnes