A Complexity-Based Emd(n,m,δ) Adaptive Image Steganography Method

Abstract

The present invention provides an EMD (n, m, [Delta]) adaptive image secret writing method based on complexity. The method comprises the steps of: determining the maximum of the [Delta] according to carriers PSNR and SSIM and a control threshold value, and calculating block complexity according to the carrier blocking block intensity, the block contrast, block positions, blocks edge and block textures and determining regulation amount of the blocks; and finally, organizing a carrier secret-embedded information table and adaptively embedding 2-bit secret bits from high to low according to the EMD (n, m, [Delta]) and the complexity. In order to improve the safety, a carrier block Hash value and a user secret key are introduced to dynamically generate block secret-embedded parameters n and mand scramble a secret-embedded regulation table. Compared to the current method, the method provided by the invention performs embedding maximization of the secret information while maintaining the high visual quality and the structure similarity, the embedding process is tightly bound with the user secret key and the carrier block Hash value, and a secret-containing carrier has a high visual quality through embedding of the complexity from high to low and enhances the safety.

Description

technical field [0001] The invention belongs to the cross field of image information security and digital image signal processing, relates to an image steganography method, in particular to an EMD (n, m, δ) adaptive image steganography method based on complexity. Background technique [0002] Digital image steganography is to use the redundancy of digital images and the masking characteristics of human vision to hide secret information in irrelevant image carriers, so as to carry out covert communication, making it difficult for illegal attackers to extract information from a large number of publicly transmitted images. Concealed secret information, so as to maximize the security of confidential information in transmission. [0003] For digital image steganography, people have proposed a variety of digital image steganographic embedding methods. For example, the BPCS method (E, Eason RO. Principle and applications of BPCS-Steganography[C] / / Proceedings of SPIE-The Internatio...

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Problems solved by technology

[0009] However, the proposed strategy fixes the modification amount of a single pixel of the EMD(n,m) model to ±1, and the overflow modification amount to ±2 without considering the different texture complexities in different regions of the image, and the masking effect on vision is also different. Therefore, it is difficult to perform large-capacity embedding while maintaining the visual quality of the embedding carrier

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