The Research Of Remote Sensing Based On Quaternary Wavelet Transform

Remote sensing image data is one of the national critical fundamental and strategic support resource, which has high scientific research and application value. With the rapid development of Internet technologies, Remote sensing image can be copied, revised and spread, which may lead the Remote sensing image owner's legitimate rights to be destroyed.Therefore, more and more people pay attention to how to add technology of copyright protection and information security into Remote sensing image.Digital watermarking technique provide an effective method to solve this problem.Wavelet transform has flexible time-frequency localization properties and has many wavelet base in transform domain of digital watermarking technique, makes the digital watermarking technique based on wavelet transform has a broad development space. However, the disadvantages of traditional wavelet transform is the translation sensitivity, lack of phase information and weak resistance to geometric attacks limiting its application in watermarking technology. Quaternions wavelet transform is a new multi-scale time-frequency analysis tool, this method not only has good translation stability, but also provide different scales of amplitude and phase information.Based on the study of digital watermarking technology and based on the theory of the quaternion wavelet transform, this paper constructs a method which based on quaternions wavelet transform digital watermarking technology, respectively applied to the single band in the remote sensing image and color remote sensing image. Paper main content includes the following several aspects:1. Introduce the basic theory about digital watermarking technology and the quaternion wavelet transform. The theoretical foundation of the digital watermarking technology includes the basic model of digital watermark technology, the typical algorithms of digital watermarking, attack methods, evaluation methods and the scrambling method application in the watermarking. And the quaternion wavelet transform theory part introduces the quaternion algebra, quaternion analytic signal, real number and complex wavelet transform.And mainly introduces the characteristics and filter design method of quaternion wavelet transform.2. Based on quaternion wavelet transform and singular value decomposition, a watermarking algorithm of single band remote sensing image is proposed. The experiment of no attack and attack experiment shows that the proposed watermarking algorithm has good transparency and robustness. Compared with other digital watermarking algorithm experiment, this algorithm shows better than the performance of other algorithm, especially in the half cutting and high-pass filtering attacks.3. Based on quaternion wavelet transform and tensor decomposition, a watermarking algorithm of color remote sensing image is proposed. This algorithm not only consider the three component R, G and B of color remote sensing image, but also consider the energy loss of tensor decomposition. The result through without attack and shows that this algorithm has good transparency and robustness. Compared with the traditional digital watermarking algorithm, our algorithm is superior to the traditional algorithm in invisibility. And when in the noise attacks, high-pass filtering attack, large scale cutting, scaling attack and compression attack, NC value is higher than the traditional algorithm. The superiority of the proposed algorithm is verified.