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Texture synthesis-based robust steganographic method

A texture synthesis and steganography technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as poor robustness of steganographic texture images

Active Publication Date: 2017-08-18
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

[0007] The steganographic texture image constructed by the above-mentioned steganographic method has considerable style and embedding data rate. However, once the steganographic image is compressed by JPEG image, the error rate of secret information extraction will also increase, and the robustness of the steganographic texture image will increase. Poor sex

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  • Texture synthesis-based robust steganographic method

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Embodiment 1

[0051] Embodiment one: see Figure 1 to Figure 4 , This is a robust steganography based on texture synthesis, and the specific steps to realize information hiding.

Embodiment 2

[0053] Figure 5 (a)~(f) are source texture images with a size of 128×128, and each image is synthesized from textures with different textures, and pictures (g)~(l) are 653×653 textures containing secret information.

[0054] see Figure 5 , this robust steganography based on texture synthesis, the specific steps are as follows:

[0055] (1) The size of the source texture image used is 128×128, and each pixel is shifted according to the raster scan order, and the texture image is divided into multiple overlapping blocks. The size of each block is 16×16. Each candidate block is further divided into a kernel area and a boundary area, and the kernel area contains 3×3 pixels.

[0056] (2) Define the candidate block as {P 1 ,P 2 ,...,P N}, and its corresponding kernel area is {R 1 , R 2 ,...,R N}, N=113×113. Estimate the complexity of kernel regions using standard deviation:

[0057]

[0058] [ ] is a rounding operator, k=1,2,...,N, where A k The expression is:

[0...

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Abstract

The invention discloses a texture synthesis-based robust steganographic method. The method comprises the steps of firstly, capturing a certain quantity of candidate blocks from a source texture image to embed secret information; secondly, according to a key, drawing the candidate blocks in a blank canvas; and finally, selecting the proper candidate blocks to synthesize a texture image, and constructing a texture image with a relatively good visual effect. At a receiving end, a receiver determines the positions of the candidate blocks on the canvas according to the key, and the original secret information is extracted according to the complexity of the candidate blocks. The steganographic texture image synthesized with the method well reserves the style of the original texture image; the size of the texture image can be proportionally adjusted according to the capacity of the embedded information so as to realize high embedding rate; and due to the complexity of texture blocks, the secret information contained in the texture image is slightly changed after image compression, and a steganographic algorithm can resist JPEG image compression, so that the robustness of the steganographic image can be improved.

Description

technical field [0001] The invention relates to a robust steganography method based on texture synthesis, which uses signal processing and computer technology to decompose digital image content so as to embed secret information in the process of texture image synthesis, thereby proposing a robust steganography algorithm. Background technique [0002] Steganography uses digital media such as images and audio as a cover, embeds the secret message to be sent into the carrier signal, and transmits it through public channels, especially the Internet, in a way that does not attract the attention of the outside world. The traditional steganographic method is to hide the secret data by rewriting the least significant bit of the carrier. The higher the degree of distortion of the carrier, the higher the risk that the interceptor will analyze the secret information by using steganalysis tools. However, the steganography method based on texture synthesis does not need a carrier before ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0057
Inventor 钱振兴吕梦琪张新鹏
Owner SHANGHAI UNIV
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