Blind Watermarking Algorithm Based on Quaternion for Double Color Image
Tao Yao, Qingtang Su, Dashun Que · Jisuanji gongcheng · 2013
This paper proposes a blind watermarking algorithm for double color image based on quaternion.Frequency matirx of the host image and watermark image are gained by using quaternion Fourier transform,and low frequency,middle frequency and high frequency are scrambled by the chaotic sequences.The scrambled watermark is embedded in low frequency,middle frequency and high frequency of host image by using Pulse Code Modulation(PCM).The watermarked host image are gained by using inverse Discrete Quaternion Fourier Transform(DQFT).Experimental results show that the algorithm has the property of perceptual transparency,and is robust to common image attacks,such as cropping image,noise,JPEG compression and so on.