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Thumbnail image privacy protection method based on image compression and elastic resolution

A technology for image compression and thumbnails, which is applied in the fields of digital image privacy protection, information security, and digital image encryption, can solve the problems of incompatibility of encrypted image formats, achieve image privacy protection, reduce storage costs, and remove detailed information Effect

Active Publication Date: 2020-09-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] First, an image encryption method that preserves the original image format is proposed to solve the problem of incompatibility of encrypted image formats

Method used

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  • Thumbnail image privacy protection method based on image compression and elastic resolution
  • Thumbnail image privacy protection method based on image compression and elastic resolution
  • Thumbnail image privacy protection method based on image compression and elastic resolution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] figure 2 A flow chart of an M200 embodiment of the algorithm encryption process of the present invention is given.

[0082] Such as figure 2 As shown, the thumbnail encryption process starts at step S210.

[0083] S220 divides the image into blocks, divides an image with an image size of 256×256 into 64 32×32 blocks, divides each 32×32 block into 8×8 sub-blocks, and S230 divides the sub-blocks in each block Perform random scrambling. In this process, the degree of scrambling between sub-blocks is determined by the level of scrambling. The level is different, and the degree of scrambling between sub-blocks is different, which directly determines the resolution of the final image. The randomness of sub-blocks The scrambled position is determined by the subkey k 0 decision (refer to M300 for the detailed scrambling process between sub-blocks).

[0084] Figure 4 A specific example diagram of random scrambling between blocks is given. For a 32×32 image block, it is d...

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Abstract

The invention discloses a thumbnail image privacy protection method based on image compression and elastic resolution. An original image is blocked; secondary division is carried out on each block toobtain subblocks; corresponding degree of random scrambling is carried out on the subblocks in each block according to a requirement of thumbnail resolution; and through combination of JPEG compression and cryptography technologies, different degree of encryption processing is carried out on DC and AC coefficients in 8x8 blocks on which DCT is carried out, thereby obtaining a thumbnail of a publicpart and completely encrypted data of a private part. According to the method, the thumbnail of the public part can be applied to image preview of a network application, and moreover, certain degreeof privacy protection is also provided. Through utilization of the image compression technology, total particularly storage cost of the public part of the encrypted image is reduced, and bandwidth canbe greatly saved. The invention also provides thumbnail image privacy protection based on the elastic resolution. Security of the image is influenced by the resolution. The lower the resolution is controlled to be, the higher the security of the image is.

Description

【Technical field】 [0001] The invention belongs to the technical fields of digital image encryption, digital image privacy protection and information security, and in particular relates to a thumbnail image privacy protection method based on image compression and elastic resolution. 【Background technique】 [0002] Compared with sound and text information, digital image overcomes the difficulty of large storage space and can convey more information because of its vivid and vivid content, thus becoming one of the most important ways of disseminating information [1]. With the rapid development of Internet applications, various cloud storage devices have begun to be used as digital image management tools. It can easily share large files asynchronously without point-to-point transmission. Even if the mobile device is lost or damaged, it can also be stored from the cloud. It can be accessed and restored on the Internet, and the cost is low, which saves a lot of costs for users to t...

Claims

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Application Information

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IPC IPC(8): H04N19/88H04N19/625H04N1/00
CPCH04N1/00095H04N19/625H04N19/88
Inventor 杜如飞苏明刘晓光
Owner NANKAI UNIV
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