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Color Image Encryption System and Encryption and Decryption Method Based on Compression Holography

A color image and encryption system technology, applied in the direction of instruments, etc., can solve problems such as limiting the encryption efficiency of color images, and achieve the effect of improving encryption efficiency and confidentiality

Active Publication Date: 2017-05-24
BEIJING UNIV OF TECH
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Problems solved by technology

This problem will greatly limit the encryption efficiency of color pictures

Method used

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  • Color Image Encryption System and Encryption and Decryption Method Based on Compression Holography
  • Color Image Encryption System and Encryption and Decryption Method Based on Compression Holography
  • Color Image Encryption System and Encryption and Decryption Method Based on Compression Holography

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] Image encryption systems based on holography such as figure 1 As shown, it includes: a laser 1, a first mirror 2, a beam expander system 3, a collimator lens 4, a beam splitter 5, a beam splitter 6, a beam splitter 7, a fourth spatial light modulator 8, a first space Light modulator 9, first random phase plate 10, second spatial light modulator 11, second random phase plate 12, third spatial light modulator 13, third random phase plate 14, second mirror 15, beam splitter device 16, beam splitter 17, beam splitter 18, high-speed image acquisition device 19.

[0042]After being reflected by the first mirror 2, the light emitted by the laser 1 becomes parallel light after passing through the beam expander system 3 and the collimating lens 4, and is divided into four beams by the beam splitters 5, 6 and 7: three beams After successively pa...

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Abstract

The invention relates to a color image encryption system and an encryption and decryption method based on compression holography and belongs to the technical field of optical image encryption. The system comprises a laser device, a first reflecting mirror, a second reflecting mirror, a beam expanding and collimating system, a beam splitter, a first spatial light modulator, a second spatial light modulator, a third spatial light modulator, a fourth spatial light modulator, a first random phase mask, a second random phase mask, a third random phase mask, a high-speed image collecting device and a computer. Firstly, gray level images of three channels of color images are extracted and are arranged at the positions with different distances to a CCD to serve as object information needing to be encrypted, the three random phase masks are tightly attached to the three gray level images and then are used for modulating light beams containing the object information, the three light beams are interfered by a beam combining prism and reference light to generate a holographic image, and the gray level images of the three channels are simultaneously encrypted on the same holographic image. Lastly, decryption is carried out with a TwIST algorithm, and color image composition is carried out. According to the color image encryption system and the encryption and decryption method based on the compression holography, the color images can be encrypted through one-time exposure, and the encryption efficiency and the confidentiality degree of the encrypted information are improved.

Description

technical field [0001] The invention relates to an optical image encryption technology, in particular to a compression holography-based color image encryption system and an encryption and decryption method. Background technique [0002] With the construction of the information highway and the development of computer science and technology, the importance of ensuring information security in the process of pursuing the rapid transmission of information has gradually become prominent. Due to the parallelism and rapidity of optical information processing and the advantages of providing multiple encryption dimensions, the use of optical methods to encrypt images has always been an important research aspect of image encryption technology. [0003] Since Philippe Refregier and Bahram Javidi proposed to use double random phase plates to encrypt images, optical image encryption technology has received widespread attention and rapid development. However, due to the difficulty in obta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/12
Inventor 杨京寰万玉红吴凡满天龙
Owner BEIJING UNIV OF TECH
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