Reversible data hiding method of ciphertext domain image based on pixel difference coding

A technology of data hiding and pixel difference, which is applied in image communication, encryption device with shift register/memory, digital transmission system, etc. Problems such as high utilization rate of residual information and difficulty

Active Publication Date: 2020-11-20
ANHUI UNIVERSITY
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Problems solved by technology

However, many reversible data hiding methods for ciphertext domain images proposed in recent years have a relatively low utilization rate of images. Some methods hide data on image division bit planes. The fact that planes cannot be use

Method used

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  • Reversible data hiding method of ciphertext domain image based on pixel difference coding
  • Reversible data hiding method of ciphertext domain image based on pixel difference coding
  • Reversible data hiding method of ciphertext domain image based on pixel difference coding

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Embodiment Construction

[0062] In this embodiment, a method for reversible data hiding of ciphertext domain images based on pixel difference encoding is applicable to reversible data hiding of grayscale images. Firstly, the difference value of the original grayscale image is calculated, and the grayscale image is encrypted. , and then perform reversible data hiding in the encrypted image according to the pixel difference, and finally perform data extraction and image recovery according to the owned key, specifically, as figure 1 As shown, proceed as follows:

[0063] Step 1, set the original grayscale image I 0 The length and width are M×N, and then the original grayscale image I 0 Divide into blocks according to the size of s×s, so that image block; calculate the middle pixel of the jth image block The difference with other pixels in the j-th image block, and select the difference with the largest absolute value, which is denoted as

[0064] The size of the image block s × s is generally n...

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Abstract

The invention discloses a reversible data hiding method of a ciphertext domain image based on pixel difference coding. The reversible data hiding method comprises the following steps: 1, calculating apixel difference; 2, performing image encryption; 3, performing reversible data hiding of a ciphertext domain of the image; and 4, performing data extraction and image recovery. According to the method, the utilization rate of the potential redundant information of the image is improved through the proposed image coding mode, so that the higher embedding capacity can be obtained while the image safety is ensured.

Description

technical field [0001] The invention belongs to the technical field of digital image steganography, in particular to a reversible data hiding method of a ciphertext domain image based on pixel difference coding. Background technique [0002] The basic principle of digital steganography is to use redundant information that is not sensitive to the human perception system in digital carriers such as images, videos, audios, and texts to hide the secret information to be transmitted into the redundant information, and the embedded information On the surface, the secret carrier is the same as the ordinary carrier in terms of vision, making it difficult for potential attackers to perceive the existence of secret information, thus ensuring the safe transmission of secret information. [0003] However, there are certain defects in the traditional information hiding technology. After the hidden information is extracted, the carrier image cannot be completely restored, which will bring...

Claims

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Application Information

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IPC IPC(8): H04N19/122H04N19/176H04N19/467H04N19/69H04L9/06
CPCH04N19/122H04L9/0656H04N19/69H04N19/176H04N19/467
Inventor 陈志立周旭吴福虎
Owner ANHUI UNIVERSITY
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