Remote-sensing image digital watermarking embedding and extraction method based on QR codes

Abstract

The present invention discloses a remote-sensing image digital watermarking embedding and extraction method based on QR codes. The QR codes are taken as watermarking information and are embedded in a carrier image; in the generation process of the QR codes, on the basis of removing the corresponding fixed information, dividing the residual watermarking information into two parts of data encoding and error correction encoding. The carrier image is subjected to 8*8 blocking DCT transformation, on the premise of embedding the feature watermarking, based on the QR code self error correction principle, the error correction encoding part of the QR codes is embedded into the low-frequency coefficient with high robustness, and the data encoding part of the QR codes is embedded into the medium-frequency coefficient which has weak influence on the image quality. The present invention further discloses a watermarking information extraction method. Through adoption of the encoding mechanism and the self error correction principle of the QR codes, the remote-sensing image digital watermarking embedding and extraction method based on the QR codes can perform data compression and preprocessing of the watermarking information so as to reduce the embedding data volume; and moreover, the remote-sensing image digital watermarking embedding and extraction method based on the QR codes can effectively resist general attack such as compression, cutting and the like and combined attack on the basis of realizing the invisibility and the blind detection of the watermarking, and has high robustness.

Description

technical field [0001] The invention belongs to the field of geographic information security, and in particular relates to a QR code-based stamp embedding and extraction method for remote sensing image digital water. Background technique [0002] As an important basic and strategic information resource of the country, remote sensing images are widely used in various fields of our country. However, with the rapid development of big data and cloud computing, the exchange and dissemination of geospatial data is becoming more and more convenient, making it easy for infringers to copy and disseminate unauthorized remote sensing images. The lack of data information security will cause data producers and owners to suffer huge economic losses. In addition, the malicious modification of remote sensing images and random dissemination will not only affect the use value of the data itself, but also cause decision-making errors, affect government affairs, and endanger national geographi...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the watermark algorithm using QR code as the watermark information generation method has a large amount of embedded data, the algorithm is difficult to resist arbitrary position clipping attacks and compound attacks, and has poor robustness, a remote sensing image based on QR code is proposed. digital watermarking method

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