Two-step quadrature phase-shift interferometry-based optical image encryption device and method

An optical image and encryption device technology, which is applied in image data processing, image data processing, instruments, etc., can solve the problems of increasing the system storage capacity and transmission burden, and achieve the increase of system parameter keys, cost reduction, and scope of application wide effect

Inactive Publication Date: 2012-06-27
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Each original image needs to be encrypted into more than three interferograms, which increases the burden on system storage and transmission

Method used

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  • Two-step quadrature phase-shift interferometry-based optical image encryption device and method
  • Two-step quadrature phase-shift interferometry-based optical image encryption device and method

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing of description and invention is further described:

[0025] Such as figure 1 The shown two-step orthogonal phase-shift interference optical image encryption device includes an optical image encryption device and an optical image decryption device, and the optical image encryption device includes an argon ion laser 1, through which the argon ion laser 1 laser output The direction is the first half-wave 3, and the laser light passing through the first half-wave plate 3 enters the first beam-splitting prism 4, and the first beam-splitting prism 4 divides the laser light into object light and reference light, which are arranged in sequence along the object light direction. There are a first beam expander collimator 14, a first reflector 13, a spatial light modulator 12, a first phase mask 11, and a second phase mask 10; Direct device 5, the second half-wave plate 6, the second mirror 7, quarter-wave plate 8; the object light o...

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Abstract

The invention relates to a two-step quadrature phase-shift interferometry-based optical image encryption device and a method, which belong to the optical image processing technical field. The two-step quadrature phase-shift interferometry-based optical image encryption device comprises an optical image encryption device and an optical image decryption device. Due to the adoption of the two-step quadrature phase-shift interferometry-based optical image encryption device, strength information of substance light waves and reference light waves are not required to record, so the calculation amount and the storage amount can be reduced, the transmission efficiency of the information is improved, the system is simplified, and the cost is reduced. Since only two holographs are required to record, the experimental operation steps can be simplified by reducing the recording times. Since the charge coupled device (CCD) recorded digital hologram has advantages of real-time recording, digital memory, digital transmission and the like, encrypted information can be transmitted to an electronic computer of the decryption device to be decrypted in an electronic way to reappear, and the optical encryption technology can be better compatible with the digital signal processing and communication system so as to be widely used. In addition, system parameter key is also increased while the security of a double random phase coding method is guaranteed, so the security of the system is further improved.

Description

technical field [0001] The invention belongs to the technical field of optical image processing, and in particular relates to an optical image encryption device and method based on two-step orthogonal phase-shift interference. Background technique [0002] Since the 1970s, technologies such as watermarking and laser anti-counterfeiting based on molded holographic technology have been widely used in the anti-counterfeiting of various documents, currency, text and images, and trademarks. However, since the 1990s, with the development of computer hardware and software and the emergence of the Internet, people have been brought into the information society. Information technology is widely used in all walks of life. The original laser anti-counterfeiting technology can no longer effectively meet people's anti-counterfeiting needs, and it is very easy to be copied or even counterfeited. Naturally, there is an urgent need for a safe and efficient information encryption technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/12G03H1/22G06T1/00
Inventor 金伟民刘健
Owner ZHEJIANG NORMAL UNIVERSITY
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