Multi-spectral image camouflage method based on multi-membrane system array

Abstract

The invention discloses a multi-spectral image camouflage method based on multi-membrane system array, and particularly relates to the technical field of image information hiding and reading. According to the multi-spectral image camouflage method, using different structures of a membrane stack, a plurality of images can be accumulated on the same surface, using the notch filter characteristic of a multi-membrane system, a spectrum is encoded to achieve multi-image hiding in the same coding plane and increase the capacity of encrypted information, in the stacking process of the membrane system, SiO2-MgF2-SiO2 is adopted by a membrane layer in one cycle to coat membranes, when the cut-off center wavelength is any Lambda<0>, the corresponding period is n. When the image appears and the corresponding wavelength light source is used for irradiating, the transmittance of the membrane layer on the corresponding point forming the image information on a sample is nearly zero, while the reflectivity is very high, and thus the image information of the corresponding wavelength can be seen in the observation of the light transmitting sample.

Description

technical field [0001] The invention relates to the technical field of image information hiding and reading, in particular to a multi-spectral image camouflage method based on a multi-film array. Background technique [0002] With the advancement and update of science and technology and the increasingly complex working environment, the technical requirements for image information hiding and reading technology continue to increase. Optical encryption technology has the advantages of high resolution, no multipath effect, good concealment, light weight, and small size. [0003] In the prior art, the article "Hiding multi-level multi-color images interahertz metasurfaces" published in December 2016 mentioned the use of resonant structure arrays, using the characteristics of different structures and different electrical conductivities, and using terahertz frequency to make the lens The resonant absorption depths in are different, thus presenting picture information. However, du...

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Problems solved by technology

However, due to the one-to-one correspondence between its metasurface structure and image information, it is impossible to present multiple images on the same surface

In the article "High-resolution grayscal image hidden in a laser beam" published in December 2017, linearly polarized light is used to directly illuminate a set of linearly polarized devices corresponding to the content of the picture, and the image is presented with different intensity of reflected light corresponding to each point information, but there is also the problem that only one picture can be hidden and the amount of information is small

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