Medical image robust watermarking method based on Tetrolet-DCT

Abstract

The invention discloses a medical image robust watermarking method based on Tetrolet-DCT. The medical image robust watermarking method comprises the following steps: performing feature extraction on an original medical image through Tetrolet-DCT and generating a visual feature sequence by utilizing a hash function; performing chaos scrambling encryption on the original watermark to obtain a chaosscrambling watermark, embedding watermark information into the original medical image, and meanwhile obtaining a binary logic secret key sequence and storing; similarly, performing feature extractionon the medical image to be detected through Tetrolet-DCT transformation, and generating a visual feature sequence; extracting an encrypted watermark according to the visual feature sequence and the binary logic key sequence, and decrypting the encrypted watermark to obtain a reduced watermark; and performing normalization correlation coefficient calculation on the original watermark and the reduced watermark, and determining the ownership and watermark information of the medical image to be detected. The zero watermark embedded in the method has invisibility and robustness, and the privacy information of the patient and the data security of the medical image can be protected.

Description

technical field [0001] The invention relates to the field of multimedia signal processing, in particular to a Tetrolet-DCT-based robust watermarking method for medical images. Background technique [0002] With the development of modern technology and information, human beings have entered the information age. The medical field is no exception. With the help of computers, medical images can be used and studied in a wider range. At the same time, medical images are related to the privacy of patients, so they may suffer from tampering and embezzlement during network transmission. [0003] Since a large number of medical images have security problems in network transmission, and medical data is not allowed to be modified, it is necessary to provide effective protection for medical images. However, the traditional digital watermark embedding method is only used for the copyright protection of digital media, and cannot protect the medical image itself, and it is easy to cause de...

AI Technical Summary

Problems solved by technology

However, the traditional digital watermark embedding method is only used for the copyright protection of digital media, and cannot protect the medical image itself, and it is easy to cause defects in the modification of the original image data. There are fewer research results on zero-watermarking algorithms for medical data with geometric attacks

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