Halftone image steganography method
A halftone and image technology, which is applied in the field of information security, can solve the problems of image density properties and related statistics without attention, and achieve the effect of improving visual imperceptibility and statistical security
Active Publication Date: 2020-11-27
SUN YAT SEN UNIV
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[0003] At present, the steganography method on halftone image spatial domain mostly refers to the spatial domain steganography method of ordinary binary image, which focuses on extracting texture features or edge information, but does not pay attention to the density properties and related statistics of the image. Unobservability and statistical security leave room for improvement
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[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment.
[0051] Such as figure 1 As shown, the present invention provides a halftone image steganography method, the method comprising the following steps:
[0052] S1. Obtain the original image and determine the size of the pattern block.
[0053] S2. Calculate the density change of the pattern block where each point of the original image is located and obtain a density change matrix;
[0054] S3. Statistics the texture distribution of pattern blocks of different densities in all images in the library and obtain an uncerta...
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The invention discloses a halftone image steganography method. The method comprises the following steps: determining the size of a mode block; obtaining a density change matrix; obtaining an uncertainty change matrix; obtaining a texture change matrix; combining the density change matrix, the uncertainty matrix and the texture change matrix to obtain a distortion score matrix; performing out-of-order processing on the original image and the distortion score matrix, and inputting secret information into an encoder to obtain an encrypted image; and scrambling the encrypted image, and inputting the scrambled image into a decoder in combination with the length of the secret information to obtain embedded information. By using the method, the statistical information of the image library and thesingle image is integrated, the density characteristic of the halftone image is emphasized, and the safety and the visual unobservability are improved. The halftone image steganography method can bewidely applied to the field of information safety.
Description
technical field [0001] The invention relates to the field of information security, in particular to a halftone image steganography method. Background technique [0002] As an important branch of information hiding research, steganography method is one of the important contents in the field of information security. Different from cryptography, steganography is dedicated to embedding and hiding specific secret information into the carrier medium, so that no one except the sender and receiver can detect the existence of the information, and its robustness and vulnerability to information There are no special requirements for performance and embedding capacity, and more attention is paid to visual quality and statistical security. Steganographic methods can guarantee people's legitimate interests, not only to protect privacy, but also to ensure the security and reliability of political, military, economic and other important information in the process of public transmission. ...
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IPC IPC(8): G06T1/00
CPCG06T1/0021Y02D10/00
Inventor 卢伟余木建
Owner SUN YAT SEN UNIV