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CN110264860B - Multispectral image camouflage method based on multi-membrane array - Google Patents

Multispectral image camouflage method based on multi-membrane array Download PDF

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CN110264860B
CN110264860B CN201910514637.5A CN201910514637A CN110264860B CN 110264860 B CN110264860 B CN 110264860B CN 201910514637 A CN201910514637 A CN 201910514637A CN 110264860 B CN110264860 B CN 110264860B
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film
image information
wavelength
image
light
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CN110264860A (en
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付跃刚
张艺馨
朱启凡
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Changchun University of Science and Technology
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0257—Multilayer

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Abstract

本发明公开了一种基于多膜系阵列的多谱段图像伪装方法，具体涉及图像信息隐藏和读取技术领域。本发明利用膜堆结构不同可以在同一表面进行多幅图像累加，利用多层膜系的陷波滤波特性，对光谱进行编码，实现在同一编码平面内，多图像隐藏，增加加密信息容量，在膜系堆叠过程中,一个周期内的膜层采用

Figure 901577DEST_PATH_IMAGE002
‑
Figure 490821DEST_PATH_IMAGE004
‑
Figure 677083DEST_PATH_IMAGE002
来进行镀膜，当截止中心波长为任意的
Figure DEST_PATH_IMAGE006
时，对应周期为n。在图像显现时，使用对应波长光源照射时，在样片上构成图像信息的对应点上的膜层对入射光透射近率乎为零，而反射率很高，故透光样件观测可以看见对应波长的图像信息。

Figure 201910514637

The invention discloses a multi-spectral image camouflage method based on a multi-film system array, and particularly relates to the technical field of image information hiding and reading. The invention utilizes different film stack structures to accumulate multiple images on the same surface, utilizes the notch filtering characteristics of the multilayer film system to encode the spectrum, realizes multiple image hiding in the same encoding plane, increases the capacity of encrypted information, and During the film stacking process, the film layers in one cycle are

Figure 901577DEST_PATH_IMAGE002
‑
Figure 490821DEST_PATH_IMAGE004
‑
Figure 677083DEST_PATH_IMAGE002
for coating, when the cut-off center wavelength is arbitrary
Figure DEST_PATH_IMAGE006
, the corresponding period is n. When the image is displayed, when the light source of the corresponding wavelength is used for illumination, the film layer on the corresponding point constituting the image information on the sample has almost zero transmittance to the incident light, and the reflectivity is very high, so the observation of the light-transmitting sample can see the corresponding Wavelength image information.

Figure 201910514637

Description

Multispectral image camouflage method based on multi-membrane array
Technical Field
The invention relates to the technical field of image information hiding and reading, in particular to a multispectral image camouflage method based on a multi-membrane array.
Background
With the progress and update of science and technology and the increasing complexity of working environment, the technical requirements for image information hiding and reading technology are continuously increased. The optical encryption technology has the advantages of high resolution, no multipath effect, good concealment, light weight, small volume and the like.
In the prior art, a document entitled "high multi-level multi-color images in terahertz methods", published in 2016 12, mentions that a resonant structure array is used, and the characteristic that the structures of the resonant structure array are different so as to make the electrical conductivity different is utilized, and the resonance absorption depth in a lens is different by using terahertz frequency so as to present picture information. However, since the super-surface structure corresponds to the image information one by one, a plurality of images cannot be displayed on the same surface. In the text High-resolution graphic image High in a laser beam published in 12.2017, a group of linear polarization devices corresponding to the content of a picture are directly irradiated by linearly polarized light, and image information is presented by different reflected light intensities corresponding to each point, but the problem that only one picture can be hidden and the information amount is small exists.
Disclosure of Invention
The invention aims to provide a multispectral image disguising method based on a multi-film array, which is used for encoding spectrums, realizing multi-image hiding in the same encoding plane and increasing the capacity of encrypted information.
The invention specifically adopts the following technical scheme:
a multispectral image camouflage method based on a multi-film array comprises a multi-film system, wherein the multi-film system adopts film layers in one period in the stacking process
Figure 707972DEST_PATH_IMAGE002
-
Figure 438031DEST_PATH_IMAGE004
-
Figure 513434DEST_PATH_IMAGE006
Coating is carried out when the cut-off center wavelength is
Figure 37956DEST_PATH_IMAGE008
When the period is n, the corresponding period is n; when the film coating is superposed on the same pixel point, the film layers with different thicknesses d are coated on the same pixel point, so that the trap waves with different central wavelengths are trapped at the same pixel point, and the central wavelengths of the trap waves are changed.
Preferably, the filter segment is encoded.
Preferably, in the process of encoding the optical filter, the encryption plate is encoded, and the cut-off center wavelength is selected to be
Figure 198810DEST_PATH_IMAGE010
And adding a corresponding wavelength filter between the light source and the encryption plate, wherein the position of the encryption plate is a film coating position selected according to the requirement of the graph, and the encryption plate is used for forming image information with the graph content showing a notch phenomenon under the corresponding wavelength.
Preferably, in the process of encoding the optical filter, since a combined pattern in which a plurality of images are collectively superimposed is seen through the encryption plate when the white light source directly irradiates the encryption plate, image information cannot be read at this time.
Preferably, when the light source with the corresponding wavelength is used for image display, the film layer at the corresponding point on the sample wafer, which constitutes the image information, has almost zero transmittance to the incident light and high reflectance, so that the image information with the corresponding wavelength can be observed through the light-transmitting sample.
The invention has the following beneficial effects:
in the process of coding the optical filter, the encryption plate is coded, and the central wavelength of truncation is selected to be
Figure 466981DEST_PATH_IMAGE010
The point, through adding the corresponding wavelength filter between light source and the encryption board, the encryption board is in the picture of the picture in the picture figure demand selected coating film position, used for forming the picture content appears the notch phenomenon and shows the image information under the corresponding wavelength, when the image shows, when using the corresponding wavelength light source to shine, the film layer on the corresponding point that forms the image information on the sample wafer is nearly zero to the incident light transmission rate, and the reflectivity is very high, so the light transmission sample piece observes the image information that can see the corresponding wavelength, can carry out the multiple image accumulation on the same surface through utilizing the membrane pile structure difference.
Drawings
FIG. 1 is a schematic diagram of a filter notch;
FIG. 2 is a wave-limiting diagram under red light illumination;
FIG. 3 is a waveform limiting diagram under green illumination;
FIG. 4 is a waveform limiting diagram under blue light illumination;
FIG. 5 is a cross-sectional view of a wave-limiting film layer for one longitudinal period of red wavelengths;
FIG. 6 is a cross-sectional view of a wavelength-limiting film layer for one longitudinal period of green wavelengths;
FIG. 7 is a cross-sectional view of a wave-limiting film layer for one longitudinal period of blue light wavelength;
FIG. 8 is a light intensity curve of a light source after passing through a red light filter;
FIG. 9 is a light intensity curve of a light source after transmitting through a green filter;
FIG. 10 is a light intensity curve of a light source after passing through a blue light filter;
FIG. 11 is a wave-limiting diagram under red and blue light irradiation;
FIG. 12 is a wavelength-limiting diagram under blue-green illumination;
FIG. 13 is a waveform limiting diagram under red and green illumination;
FIG. 14 is a wave-limiting diagram under irradiation of red, blue and green lights;
FIG. 15 is a cross-sectional view of a wave-confining film layer for one longitudinal period of red and blue light wavelengths;
FIG. 16 is a cross-sectional view of a wavelength-limiting film layer for one longitudinal period of blue-green light wavelengths;
FIG. 17 is a cross-sectional view of a wave-limiting film layer during one longitudinal period of red and green wavelengths of light;
FIG. 18 is a cross-sectional view of a wavelength-limiting film for red, blue and green light;
FIG. 19 is a graph showing the intensity of light after the light source has passed through the blue-green filter;
FIG. 20 is a graph showing the intensity of light after the light source has passed through the blue-green filter;
FIG. 21 is a graph showing the intensity of the red and green light passing through the red and green filters;
FIG. 22 is a light intensity curve of a light source after passing through a red, blue, green and blue filter;
FIG. 23 is a schematic view of sample coating.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in FIG. 1, a multispectral image camouflage method based on a multi-film array comprises a multi-film system, wherein the multi-film system adopts film layers in one period in the stacking process
Figure 301950DEST_PATH_IMAGE002
-
Figure 403899DEST_PATH_IMAGE004
-
Figure 176683DEST_PATH_IMAGE002
Coating is carried out when the cut-off center wavelength is
Figure 356866DEST_PATH_IMAGE008
When the period is n, the corresponding period is n; when the cut-off center wavelength is plural, that is, the cut-off center wavelengths are respectively
Figure DEST_PATH_IMAGE012
，
Figure DEST_PATH_IMAGE014
，
Figure DEST_PATH_IMAGE016
The three image information are respectively corresponding to the image information shown in figure 2, figure 3 and figure 4; when the film coating is superposed on the same pixel point, the film layers with different thicknesses d are coated on the same pixel point, so that the trap waves with different central wavelengths are trapped at the same pixel point, and the central wavelengths of the trap waves are changed. As shown in fig. 5, 6, and 7, the corresponding wavelength reflectivity images are shown in fig. 8, 9, and 10; the film systems with different cut-off center wavelengths are mutually superposed and do not influence each other, the images are displayed as shown in fig. 11, 12, 13 and 14, the film structure corresponding to each point is shown in fig. 15, 16, 17 and 18, and the corresponding wavelength-reflectivity image is shown in fig. 19, 20, 21 and 22.
Encoding the filter, encoding the encryption plate in the process of encoding the filter, and selecting the center wavelength of the cut-off as
Figure 141282DEST_PATH_IMAGE010
And adding a corresponding wavelength filter between the light source and the encryption plate, wherein the position of the encryption plate is a film coating position selected according to the requirement of the graph, and the encryption plate is used for forming image information with the graph content showing a notch phenomenon under the corresponding wavelength. In the process of coding the optical filter, since a combined pattern formed by the superposition of a plurality of images is seen through the encryption plate when the white light source directly irradiates the encryption plate, the image information cannot be read at this time.
As shown in figure 23 of the drawings,
Figure 882973DEST_PATH_IMAGE017
the corresponding region is the trap center wavelength
Figure 408633DEST_PATH_IMAGE012
The number of the pixel points of (a),
Figure 392507DEST_PATH_IMAGE014
the corresponding region is the trap center wavelength
Figure 421643DEST_PATH_IMAGE014
The number of the pixel points of (a),
Figure DEST_PATH_IMAGE018
corresponding to the region having a trap center wavelength of
Figure 209601DEST_PATH_IMAGE016
The number of the pixel points of (a),
Figure 691398DEST_PATH_IMAGE012
、
Figure 750402DEST_PATH_IMAGE014
corresponding regions are trap center wavelengths of
Figure 774990DEST_PATH_IMAGE019
、
Figure 248696DEST_PATH_IMAGE014
，
Figure 358735DEST_PATH_IMAGE014
The corresponding regions have trap central wavelengths of
Figure 310510DEST_PATH_IMAGE014
、
Figure 455184DEST_PATH_IMAGE016
When the white light is irradiated, the transmitted information is the color light with all wavelengths because the white light contains the color light with all wavelengths
Figure 473693DEST_PATH_IMAGE014
The wavelength content, at this point, hides the image information at the particular wavelength.
When the light source with the corresponding wavelength is used for irradiation during image display, the film layer on the corresponding point of the sample wafer, which forms the image information, has almost zero transmission rate to the incident light and high reflectivity, so that the image information with the corresponding wavelength can be observed by the light-transmitting sample.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.

Claims (3)

1.一种基于多膜系阵列的多谱段图像伪装方法，特征在于，其包括多层膜系，该多层膜系在堆叠过程中，一个周期内的膜层采用SiO2-MgF2-SiO2进行镀膜，当截止中心波长为λ0时，对应周期为n；在同一像素点上叠加镀膜时，在同一像素点镀不同厚度d的膜层，实现在同一像素点对不同中心波长陷波，来改变陷波中心波长；对滤波片进行编码；1. A multi-spectral image camouflage method based on a multi - film system array, characterized in that it comprises a multi - layer film system. Coating with SiO 2 , when the cut-off center wavelength is λ 0 , the corresponding period is n; when superimposing coatings on the same pixel point, coating layers with different thicknesses d on the same pixel point to realize the trapping of different center wavelengths at the same pixel point. wave to change the notch center wavelength; encode the filter; 在对滤光片进行编码的过程中，对加密板进行编码，选择截止中心波长为λi点，在光源和加密板之间加入相应波长滤波片，加密板的位置为按照图形需求选择的镀膜位置，用来构成图形内容出现陷波现象显现相应波长下的图像信息。In the process of encoding the filter, encode the encryption board, select the cut-off center wavelength as λ i point, add a corresponding wavelength filter between the light source and the encryption board, and the position of the encryption board is the coating selected according to the graphic requirements. The position is used to form the notch phenomenon in the graphic content to display the image information under the corresponding wavelength. 2.如权利要求1所述的一种基于多膜系阵列的多谱段图像伪装方法，其特征在于，在对所述滤光片进行编码的过程中，由于当白光光源对加密板直接照射时，透过加密板看见多幅图像共同叠加的组合图案，此时无法读取图像信息。2. A multi-spectral image camouflage method based on a multi-film array according to claim 1, characterized in that, in the process of encoding the filter, because when the white light source directly illuminates the encryption plate At this time, the combined pattern of multiple images superimposed together can be seen through the encryption plate, and the image information cannot be read at this time. 3.如权利要求1所述的一种基于多膜系阵列的多谱段图像伪装方法，其特征在于，在图像显现时，使用对应波长光源照射时，在样片上构成图像信息的对应点上的膜层对入射光透射率近乎为零，而反射率很高，故透光样件能看见对应波长的图像信息。3. A multi-spectral image camouflage method based on a multi-film array according to claim 1, wherein when the image is displayed, when the corresponding wavelength light source is used to illuminate, the corresponding points of the image information are formed on the sample. The transmittance of the film to the incident light is almost zero, and the reflectivity is very high, so the light-transmitting sample can see the image information of the corresponding wavelength.
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