Encryption domain image reversible data hiding method based on neighborhood prediction

A data hiding and encryption domain technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of low distortion, large embedding capacity, and low embedding capacity

Active Publication Date: 2019-05-24
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing encryption domain reversible data hiding technology can be divided into three categories: the first category is to encrypt the image and then find the data embedding space, this kind of method generally has a low embedding capacity, and data extraction errors will occur; the second category is the image The data embedding space is reserved before encrypt

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  • Encryption domain image reversible data hiding method based on neighborhood prediction

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Embodiment 1

[0082] A method for reversible data hiding of encrypted domain images based on neighborhood prediction proposed in this embodiment, the overall implementation block diagram is as follows figure 1 As shown, it includes three parts: image encryption, image reversible data hiding in encrypted domain, and secret information extraction.

[0083] In the image encryption part, the image is divided into non-overlapping image blocks first, and the size of the image block is 2×2 or 2×1 or 1×2 or 1×1; then the size of the image is 2× 2 image blocks are identified as embeddable blocks or non-embeddable blocks; then use the value of each element in a random sequence to encrypt each pixel in each image block in the image to obtain an encrypted domain image, and randomly The sequence is sent to the secret information extraction end.

[0084] In the reversible data hiding part of the encrypted domain image, first divide the encrypted domain image into non-overlapping image blocks, the size o...

Embodiment 2

[0130] A method for reversible data hiding of encrypted domain images based on neighborhood prediction proposed in this embodiment, such as figure 1As shown, the specific steps of the image encryption part are the same as those of the image encryption part of Embodiment 1, and the specific steps of the reversible data hiding part of the encrypted domain image are the same as the specific steps of the reversible data hiding part of the encrypted domain image of Embodiment 1. The only difference is The secret information extraction part, the secret information extraction part of this embodiment is completed in the decryption domain, and the secret information extraction is completed in the decryption domain, and the original image is restored without loss: first, the encrypted domain image containing the secret information is divided into non-overlapping image blocks. , the size of the image block is 2×2 or 2×1 or 1×2 or 1×1; then use the value of each element in the random seque...

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Abstract

The invention discloses an encrypted domain image reversible data hiding method based on neighborhood prediction. The method comprises three steps including Image Encryption reversible data hiding and; secret information extraction; In the image encryption part, an image is segmented into image blocks; the pixel value of each pixel point in each image block and the value of one element in the random sequence are added for encryption, and modulo operation is performed on 256 to realize encryption ; the linear prediction difference values meeting the specific conditions in the image blocks arekept consistent before and after encryption; data hiding in the encrypted image can be ensured; The method has the advantages that hidden information extraction and image decryption are achieved, complete separation of hidden information extraction and image decryption is guaranteed, hidden information can be effectively extracted in an encryption domain, hidden information can also be effectivelyextracted in a decryption domain, the practicability is higher, and meanwhile it can be guaranteed that an original image can be restored without distortion after the hidden information is extracted.

Description

technical field [0001] The invention relates to a technology for image reversible data hiding, in particular to a method for image reversible data hiding in an encrypted domain based on neighborhood prediction. Background technique [0002] Under the cloud computing platform, the provider of multimedia content does not have to be a storer and a processor at the same time. In this mode of work, user data is largely "out of control". One of the best ways to ensure the security of multimedia data is to encrypt the multimedia data. Users first encrypt sensitive content before uploading. All processing and calculations in the cloud are performed in the ciphertext domain, and the processing results are provided to the user. The user can only obtain the plaintext data after decryption. [0003] In many application scenarios, some cloud service managers without decryption authority need to embed some additional information in the encrypted carrier, such as annotation or authentica...

Claims

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Application Information

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IPC IPC(8): H04N19/122H04N19/176H04N19/182H04N19/467H04N1/44
Inventor 徐达文
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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