Feature invariants based remote sensing image watermark method

Abstract

The invention discloses a feature invariant based remote sensing image watermark method which is directed at overcoming the incompatibility between anti-geometric attack and anti common image processing attack of the DCT algorithm and at the same time fully exhibits the advantages of 2D code, such as large storage information amount and strong error correction. The method includes the following steps: looking for invariants in 8 x 8 subblocks converted by the DCT algorithm, calculating embedded watermark information bits by using a mapping function in combination with the invariants, marking an initial position of each 8 x 8 subblock with intermediate frequency coefficients. In the process of watermark detection, image blocks containing watermark information can be located in a rapid and accurate manner through the determination of a feature location region. According to the invention, features of pixel digital numbers of remote sensing images before and after the geometric attack are fully utilized to address the problem of desynchrony of watermark information, which substantially increases robustness of the DCT algorithm, addresses the problem of inability of current remote sensing image digital watermark algorithm to resist cropping attacks, and effectively protects copyright of remote sensing image data.

Description

technical field [0001] The invention belongs to the field of geographic information copyright protection, and specifically relates to a digital watermark embedding and detection method for remote sensing image data using a feature watermark to mark the embedding position of the watermark, so as to improve the robustness of the remote sensing image digital watermark algorithm. Background technique [0002] In recent years, with the rapid development of the digital and network era, the storage, transmission and replication of digital remote sensing images have become very convenient and fast. Illegal copying and duplication of remote sensing data will not only cause huge economic losses to the owners of remote sensing images, but also endanger national security and national defense security. This makes data owners reluctant to disclose or release their products easily, unwilling to share, and afraid to share, which seriously hinders the development of geographic information in...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a digital watermark embedding and detection method for remote sensing image data using feature watermarks to identify copyright watermarks in view of the current remote sensing image watermarking technology that cannot solve the problems of watermark information location, difficulty in resisting arbitrary position cropping attacks, and poor robustness. method to realize remote sensing image copyright authentication with strong resistance to cropping, compression, translation, noise, filtering and other attacks

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