Remote sensing image blind watermark scheme capable of effectively resisting affine transformation

Abstract

The invention discloses a remote sensing image blind watermark scheme capable of effectively resisting affine transformation, which comprises the following steps: firstly, extracting feature points with affine invariance in an image through an ASIFT algorithm, screening a proper amount of stable feature points according to a feature scale, and constructing a corresponding feature region; then, performing normalization processing on the feature region by using an affine invariant moment; then performing Arnold transformation on the watermark image to obtain scrambled watermark information; and finally, embedding the watermark into a sub-region positioned by the centroid of the feature region according to a quantization rule, carrying out reverse normalization on a difference image of the feature region before and after the watermark is embedded, and finally, superposing the reverse normalization difference image on the feature region of the original image to complete embedding of the watermark. The watermark scheme has good invisibility, has strong robustness to attacks such as affine transformation including rotation, translation and scaling, cutting and the like, and can resist conventional signal attacks such as Gaussian noise, salt and pepper noise, median filtering and the like.

Description

technical field [0001] The invention belongs to the field of surveying and mapping science and technology, and relates to a remote sensing image blind watermarking scheme that effectively resists affine transformation. Background technique [0002] Remote sensing imagery is an important basic and strategic information resource of the country, and an important tool for the country to carry out scientific planning, environmental protection, resource development, and military operations. With the rapid development of computer network technology, sharing and easy copying of remote sensing data has become more and more common. These factors can improve the quality of geographic information services, but at the same time increase the insecurity of remote sensing data. Digital watermarking technology is a cutting-edge information security technology developed in recent years. It not only has an important application in the copyright protection of ordinary images, but also provides ...

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Problems solved by technology

Based on this scheme, Chengyou W et al. proposed a robust watermarking scheme based on ASIFT against geometric attacks, using ASIFT feature point matching for geometric distortion correction, which significantly improves the ability of watermarks to resist geometric attacks, but this type of scheme belongs to non-blind watermarking scheme, the original carrier is needed when detecting the watermark, and its application is greatly limited; (2) The method based on the affine invariant field

It is more common to use methods such as Fourier-Mellin transform, DFT transform and normalization to improve the robustness of watermarking. Sridevi T et al. proposed a robust watermarking scheme based on normalization and DC coefficients, which can resist different contrast images. geometric deformation and histogram equalization, noise and other attacks, but currently such schemes can only resist RST attacks, and are not robust to clipping attacks; (3) methods based on feature regions

Extract stable feature points of the image, and repeatedly embed the watermark into the area around a small number of stable feature points. Zhou Lin et al. proposed a robust watermarking scheme based on Blob-Harris feature area combined with CT-SVD. It has good robustness and a certain degree of compound attack, but it does not take into account the influence of affine transformation on the robustness of watermarking.

The above watermark scheme can better resist translation, rotation and other attacks, but it does not involve the research of watermark anti-affine transformation

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