Multiple image encryption method and device using optical polarization status
An encryption device and multiple image technology, applied in the direction of encoding/decoding devices, instruments, etc., can solve the problems of unfavorable applications, non-continuously adjustable laser wavelength, and very high position accuracy requirements, and achieve simple structure, high security, and improved safety effect
Inactive Publication Date: 2007-12-12
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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[0009] However, in the above-mentioned multiple image encryption technologies, since the wavelength of the laser is not continuously adjustable, there are certain limitations in practical use for multiple image encryption using wavelengths
The multiple image encryption realized by the displacement of the random phase template and the rotation of the recording crystal has very high requirements for their positional accuracy during decryption, which is not conducive to practical applications.
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[0034] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0035] Please refer to FIG. 1 and FIG. 2 first. FIG. 1 and FIG. 2 are a schematic structural diagram of an optical encryption device and a schematic structural diagram of an embodiment of an optical decryption device of an embodiment of a multiple image encryption device of the present invention, respectively. As can be seen from the figure, the multiple image encryption device of the present invention includes an optical image encryption device and an optical image decryption device, characterized in that:
[0036] The composition of the optical image encryption device includes: a first laser 101, along the laser output direction of the first laser 101, the first beam expander 201, the original image input surface 5, the first spatial light modulator 6 and the encryption Image output surf...
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The invention relates to a multi image encryption method and device using polarization modulation random and reverse modulation recoverability for binary polarization generation and checking of the polarization. Corresponding multi image encryption comprises the optical image encryption and decoding with the former composed of the first laser having the first expansion beam, original image input surface, the first space optical modulator and encryption image output surface along the output direction of the laser, the latter composed of the second laser having the second expansion part decoding input surface, the second space optical modulator, lens, inspection polarization machine and the optical probe, the said first space modulator, the second modulator and the optical probe working synchronically by the control of the computer.
Description
technical field [0001] The invention relates to optical image encryption, in particular to a method and device for multiple optical image encryption using light polarization state. Background technique [0002] The development of optical security technology has gone through a long time, initially applying watermark and gravure printing technology to currency anti-counterfeiting. However, with the development of computer technology and the widespread application of photodetector CCDs, the phenomenon of ordinary holograms being copied is becoming more and more serious. Therefore, this anti-counterfeiting technology has lost anti-counterfeiting and confidentiality functions, and has brought very large economic loss to some enterprises, banks and individuals. Image encryption technology using optical information processing technology has shown great application value in the field of information security due to its advantages of high processing speed, high parallelism, high encr...
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IPC IPC(8): G09C5/00
Inventor 顾唯兵何红
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI