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High-capacity steganographic method based on JPEG (Joint Photographic Experts Group) digital image

A digital image and steganography technology, applied in image communication, digital video signal modification, television, etc., can solve the problems of low capacity of steganography algorithm, enhance the robustness of steganographic image, increase the steganographic capacity, etc.

Inactive Publication Date: 2011-04-13
周岩
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Problems solved by technology

[0011] The present invention overcomes the shortcoming of low capacity of the existing steganography algorithm based on the JPEG digital image frequency domain, and proposes a method based on modifying the JPEG quantization table to greatly increase the steganography capacity, and can improve the image quality of the steganographic image at the same time. Enhancing the robustness of steganographic images, that is, anti-attack

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  • High-capacity steganographic method based on JPEG (Joint Photographic Experts Group) digital image

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0026] The quantization table is the core idea of ​​the present invention. How to formulate a reasonable quantization table is the key to increase the steganography capacity. attached image 3 The design idea of ​​the quantization table is as follows:

[0027] After each 16*16 block is subjected to discrete cosine transform, there are 256 elements in the matrix. Among them, the element with the largest value in the first row and first column in the upper left corner is called the DC coefficient, which concentrates the most in this frequency domain block. The energy of , can be understood as the most important value in the block, so it needs to be quantized to a smaller extent; the remaining 255 elements are called AC coefficients, and the 255 AC coefficients are divided into low frequency from the upper left corner to the lower right corner , mid-fre...

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Abstract

The invention discloses a method for hiding the information of a JPEG (Joint Photographic Experts Group) digital image based on a modified quantization table, in particular to an improved quantization table 16*16 by changing the method of a traditional quantization table 8*8 in the JPEG standard and embedding 2 bits of information at the 2-LSBs (Least Significant Bit) of each low and medium frequency coefficients in the DCT domain after carrying out DCT (Discrete Cosine Transform) and quantization to the carrier image. On the basis of favorable robustness and invisibility, the method modifies the quantization table so as to fully extract secrete information to be hidden, greatly improve the capacity of the steganographic method in comparison with a traditional Jsteg method and obatin higher hidden image quality.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing and information security, and in particular relates to a high-capacity steganographic method based on JPEG digital images by modifying the traditional JPEG standard 8*8 quantization table into a 16*16 quantization table. Background technique [0002] Currently, image information hiding techniques mainly focus on the spatial domain and transform domain. The algorithm of the airspace is to directly embed steganographic information in the image without making any changes to the image. Commonly used algorithms such as LSB (Least Significant Bit: Least Significant Bit) directly replace the lowest bit of each pixel and embed 1 bit information to achieve the purpose of not causing changes visually. The advantage of this algorithm is that the steganographic capacity is large, and the disadvantage is that the robustness is poor. The slightest steganographic attack will cause serious damage to t...

Claims

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Application Information

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IPC IPC(8): H04N1/41H04N7/26H04N7/30H04N19/46
Inventor 周岩
Owner 周岩
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