CN108254938B - Double imaging method and system of Fourier transform array and application thereof - Google Patents
Double imaging method and system of Fourier transform array and application thereof Download PDFInfo
- Publication number
- CN108254938B CN108254938B CN201810061952.2A CN201810061952A CN108254938B CN 108254938 B CN108254938 B CN 108254938B CN 201810061952 A CN201810061952 A CN 201810061952A CN 108254938 B CN108254938 B CN 108254938B
- Authority
- CN
- China
- Prior art keywords
- array
- image
- micro
- light source
- text
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/60—Systems using moiré fringes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
Abstract
The invention relates to a dual imaging method, system and application of Fourier transform array. The light emitted by the light source illuminates the focusing element array layer and the micro-image-text array layer, and a series of image points of the light source are formed near the focus of the focusing element array through the convergent imaging action of the focusing element. Light rays emitted by the light source penetrate through the micro image-text array twice to form two sets of Fourier transform spectrums, and Moire images are formed respectively; the imaging method and the imaging system have special light response and can be used in the fields of information and image processing, anti-counterfeiting security, package decoration and the like.
Description
Technical Field
The invention relates to the field of imaging devices, in particular to a double-imaging method and a double-imaging system of a Fourier transform array, which can be used for information and image processing, anti-counterfeiting safety, package decoration and the like.
Background
The micro lens array is a typical micro optical device and has wide application in the fields of optical information processing, three-dimensional display, safety and anti-counterfeiting and the like. In optical information processing application, the micro lens array can realize multichannel parallel optical information conversion and optical interconnection. In the field of stereoscopic display, the microlens array can realize the recording and displaying of stereoscopic information. In security anti-counterfeiting applications, the microlens array can realize moire images with dynamic three-dimensional effects. For example, U.S. Pat. No. 4,892,336 discloses a security thread formed by matching a lenticular array and a striped micropattern array superimposed on each other. Drinkwater et al, in U.S. patent No. Pat. number 5,712,731, propose a moire imaging system in which a spherical lens array and a micro pattern array are matched to each other. Chinese patent 200680048634.8 extends the arrangement symmetry of microlens arrays and micropattern arrays in security devices, proposes an arrangement based on a two-dimensional bravais lattice, and uses this arrangement to realize corresponding security devices, thereby further enhancing the security performance of the devices. R.a. Steenblik et al in U.S. Pat. No.2005/0180020 a1 and the subsequent patent U.S. Pat. No. 2008/0037131 a1 expand the parameter range of the above-mentioned micro-optical system, reduce the aperture and focal length of the lens, make the thickness of the system less than 50um, form a thin film type safety device, thereby expanding its application range. Chinese patent application 201710039586.6 proposes a reflective security device that can respond to illumination, improving security performance.
The limitations of the above applications: (1) the method only relates to the transformation and imaging relation between the micro lens array and the image information, and does not consider the transformation characteristic of a system consisting of a light source and a lens array to the image, so that the performance of the array imaging system is limited. (2) The same image source can only be imaged once or transformed, the same image source cannot be realized, and the same system can be imaged for multiple times or transformed.
Disclosure of Invention
Accordingly, the present invention is directed to a method and system for implementing dual imaging by a fourier transform array imaging system formed by an array of light sources and focusing elements, and applications thereof in information and image processing, security, and packaging decoration. The method and the system can realize two times of transformation and imaging on the same image source.
The invention adopts the following technical scheme: a dual imaging method of Fourier transform array is realized by a Fourier transform array system formed by a light source and a focusing element array; carrying out Fourier transform Moire imaging on the micro graphic and text array by utilizing the Fourier transform array system; the light emitted by the light source passes through the micro image-text array twice, the light emitted by the light source passes through the micro image-text array for the first time, and a first set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source; the light ray firstly passes through the micro-image-text array and then is reflected and secondly passes through the micro-image-text array, and a second set of Fourier transform spectrums of the micro-image-text array are formed at the image point of the light source or at infinity. A first set of Fourier transform spectra at each of the source image points is propagated to form a first set of magnified moire images; a second set of Fourier transformed spectra at the source image points propagates to form a second set of magnified moir images.
Furthermore, two sets of Fourier transform spectrums of the micro image-text array are obtained by placing the micro image-text array outside the plane of the image point of the light source.
A dual imaging system of Fourier transform array comprises a light source, a focusing element array and a micro-image-text array; the light source and the focusing element array form a Fourier transform array system, the micro-image-text unit is composed of pixel units, and the pixel units form the micro-image-text unit with the image to be imaged. The light emitted by the light source passes through the micro image-text array twice, the light emitted by the light source passes through the micro image-text array for the first time, and a first set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source; the light rays pass through the micro image-text array for the first time and then pass through the micro image-text array for the second time after being reflected, and a second set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source or at infinity. A first set of Fourier transform spectra at each of the source image points is propagated to form a first set of magnified moire images; a second set of Fourier transformed spectra at the source image points propagates to form a second set of magnified moir images.
Further, the micro-graphic and text unit is not on the image plane of the light source.
Further, the microimage-text unit is between the array of focusing elements and the image plane of the light source.
Further, the pixel cell is a weak scattering cell, preferably the ratio of scattered light to directly transmitted light is 1: and 9 or less.
Further, in the focusing element unit array layer, an arrangement manner of the focusing element units includes: orthogonal arrangements with axes of symmetry, honeycomb arrangements, low symmetry arrangements without axes of symmetry, random arrangements, or the like. The arrangement mode of the micro image-text units is the same as that of the focusing units.
Further, the focusing element unit may employ various micro-optical devices having a focusing function, such as a cylindrical micro-lens, a spherical lens, an aspherical lens, a fresnel lens, and the like. The aperture of the focusing element unit can be round, square, rectangle, hexagon, other polygons and other geometric shapes.
Further, the device also comprises a substrate layer used for fixing the focusing element array layer and the micro-image-text array layer.
The method and the system are applied to information and image processing, anti-counterfeiting security and package decoration.
The invention has the advantages that:
(1) twice transformation and imaging of the same image source are realized;
(2) the device has the light illumination response imaging characteristic and the light illumination imaging characteristic;
(3) the formed image has a three-dimensional dynamic effect which dynamically changes with illumination.
Drawings
FIG. 1 is a schematic view of the apparatus described in example 1;
FIG. 2 is a graph of the light response of the device described in example 1;
FIG. 3 is a schematic view of the apparatus described in example 2;
FIG. 4 is a graph of the light response of the device described in example 2;
FIG. 5 is a schematic view of the apparatus described in example 3;
FIG. 6 is a graph of the light response of the device described in example 3;
FIG. 7 is a schematic view of the apparatus described in example 4;
FIGS. 8 and 9 are graphs of the light response of the device described in example 4;
FIG. 10 is a schematic view of the apparatus described in example 5;
FIG. 11 is a graph showing the light response of the device described in example 5;
in the figure, 1 is a light source, 2 is a focusing element array layer, 3 is a substrate layer, 4 is a micro-graph and text array layer, 40 is a micro-graph and text unit 41 and 42 which represent different areas in the micro-graph and text array layer, 5 is an image plane of the light source, 6 is a light source image point, 7 and 8 respectively represent moire images, 9 is a reflection layer, 10 is an eye, and 11 is a separation imaging device.
Detailed Description
In addition, the device has the following light response, and can be used in the fields of information and image processing, anti-counterfeiting security, package decoration and the like:
under the illumination of the point light source, the response form generated further comprises: the point light source is turned on, the first set of moire images and the second set of moire images are displayed simultaneously, and when the point light source is turned off, the moire images are not displayed; the point light source is opened, the first set of moire images and the second set of moire images are displayed simultaneously, and when the point light source is closed, the set of moire images are displayed.
Under the illumination of the point light source, the response form generated further comprises: when the illumination direction of the point light source is changed, the spatial positions of the first set of moire images and the second set of moire images are dynamically changed along with the change: when the point light source transversely translates, the moire image transversely translates along with the point light source, and when the point light source longitudinally translates, the moire image longitudinally translates along with the point light source; when the point light source longitudinally translates, the moire image rotates around the optical axis, and when the point light source rotates around the optical axis, the moire image rotates.
Under the illumination of the collimated light source, the response form generated comprises: the collimating light source is turned on, the first set of moire images and the second set of moire images are displayed simultaneously, and when the collimating light source is turned off, the moire images are not displayed; the collimated light source is turned on, the first set of moire image and the second set of moire image are displayed simultaneously, and when the collimated light source is turned off, the set of moire images are displayed.
Under the illumination of the collimated light source, the response form generated further comprises: when the illumination direction of the collimation light source is changed, the spatial positions of the first set of moire images and the second set of moire images are dynamically translated or rotated.
The present invention will be further described with reference to the following examples.
Example one
The present embodiment provides a dual imaging system and method of fourier transform array, as shown in fig. 1-2, and as shown in fig. 1, the dual imaging system includes a light source 1, a focusing element array layer 2, a substrate layer 3, and a micro-pattern array layer 4. The focusing element array layer 2, the substrate layer 3 and the micro-image-text array layer 4 are sequentially bonded. The light source 1 forms an image plane 5 of the light source at a distance F from the array of focusing elements by means of the array of focusing elements 2, which image plane of the light source consists of a series of image points 6 of the light source. The micro-teletext array is located at a distance of g = 0.5F from the light source image plane 5. The focusing element array layer 2 is formed by orthogonally arranging square caliber aspheric mirror units with the focal length of f, and the array period is T. The micro-image-text array layer 4 is obtained by arranging micro-image-text units 40 on a transparent substrate layer. The micro graphic and text units are arranged orthogonally, and the array period is different from that of the focusing element and is 0.998T. The symmetry axis of the micro-image-text array and the symmetry axis of the focusing element array are parallel to each other.
The light emitted by the light source is firstly incident on the micro-graph and text unit 40 to illuminate the area 41 in the micro-graph and text unit, and the transmitted light is reflected by the focusing element array layer and then is secondly incident on the micro-graph and text unit to illuminate the area 42 in the micro-graph and text unit to be converged at the image point 6 of the light source. The first incidence of the light source on the illuminated area 41 formed by the microimage-text elements forms a first set of fourier transform spectra of the microimage-text array at the image point of the light source. The first set of fourier spectra from the image points of the respective light sources at the image plane 5 are propagated to form a first set of moire images 8.
The illumination area 42 formed by the light source incidence of the micro-image-text unit for the second time forms a second set of Fourier transform spectrum of the micro-image-text array at the image point of the light source; the second set of fourier spectra from the image points of the respective light sources on the image plane 5 continue to propagate to form a second set of moire images 7.
As shown in fig. 2, the light source rotates clockwise around the optical axis of the imaging system 11, and the moire images 7 and 8 also rotate clockwise around the optical axis of the imaging device.
Based on the light response characteristics, the device can be used for a safety device to carry out safety identification verification. Or for information and image processing, packaging decoration, etc.
Example two
The present embodiment provides a dual imaging system and method of fourier transform array, as shown in fig. 3-4, and fig. 3 includes a light source 1, a focusing element array layer 2, a substrate layer 3, and a micro-pattern array layer 4. The focusing element array layer 2, the substrate layer 3 and the micro-image-text array layer 4 are sequentially bonded. The light source 1 forms an image plane 5 of the light source at a distance F from the array of focusing elements by means of the array of focusing elements 2, which image plane of the light source consists of a series of image points 6 of the light source. The micro-teletext array is located at a distance g = 0.2F from the light source image plane 5. The focusing element array layer 2 is formed by arranging spherical reflector units with hexagonal calibers and f focal lengths in a honeycomb manner, and the central distance between adjacent reflectors is T. The micro-image-text array layer 4 is obtained by arranging micro-image-text units 40 on a transparent substrate layer. The micro-image-text units are arranged in a honeycomb shape, and the center distance between the adjacent image-texts is 1.001T. The symmetry axis of the micro-image-text array and the symmetry axis of the focusing element array are parallel to each other.
The light emitted by the light source enters the micro-graphic unit 40 for the first time to illuminate the area 41 in the micro-graphic unit, and the transmitted light is converged at the image point 6 of the light source after being reflected by the focusing element array layer. The light is incident on the microimage unit a second time after passing through the image point 6, illuminating a region 42 in the microimage unit.
The first incidence of the light source on the illuminated area 41 formed by the microimage-text elements forms a first set of fourier transform spectra of the microimage-text array at the image point of the light source. The first set of fourier spectra from the image points of the respective light sources at the image plane 5 are propagated to form a first set of moire images 8.
The illumination area 42 formed by the light source for the second time entering the micro-graphic and text unit forms a second set of Fourier transform spectrum of the micro-graphic and text array at infinity; the second set of fourier spectra from the image points of the respective light sources on the image plane 5 form a second set of moire images 7.
As shown in fig. 4, the light source rotates clockwise around the optical axis of the imaging system 11, the moire image 7 rotates counterclockwise around the optical axis of the imaging system, and the moire image 8 also rotates clockwise.
Based on the light response characteristics, the device can be used for a safety device to carry out safety identification verification. Or for information and image processing, packaging decoration, etc.
EXAMPLE III
The present embodiment provides a dual imaging system and method of fourier transform array, as shown in fig. 5-6, and as shown in fig. 5, the dual imaging system includes a light source 1, a focusing element array layer 2, a substrate layer 3, a micro-pattern array layer 4, and a reflective layer 9. The focusing element array layer 2, the substrate layer 3, the micro-image-text array layer 4 and the reflecting layer 9 are bonded in sequence. The light source 1 forms an image plane 5 of the light source at a distance F from the array of focusing elements by means of the array of focusing elements 2, which image plane of the light source consists of a series of image points 6 of the light source. The microimage array is positioned proximate to the array layer of focusing elements. The focusing element array layer 2 is formed by randomly arranging round-caliber aspheric lens units with focal length f, and the average central distance between adjacent lenses is T. The micro-image-text array layer 4 is obtained by arranging micro-image-text units 40 on a transparent substrate layer. The micro-image-text units correspond to the lens units one by one, and the average center distance between adjacent images and texts is 0.998T.
After light emitted by the light source penetrates through the lens unit, the light enters the micro-image-text unit 40 for the first time to illuminate the area 41 in the micro-image-text unit, the transmitted light is reflected by the reflecting layer 9 and then enters the micro-image-text unit for the second time to illuminate the area 42 in the micro-image-text unit, and then the light is converged at the image point 6 of the light source again through the lens.
The first incidence of the light source on the illuminated area 41 formed by the microimage-text elements forms a first set of fourier transform spectra of the microimage-text array at the image point of the light source. The first set of fourier spectra from the image points of the respective light sources at the image plane 5 are propagated to form a first set of moire images 8.
The illumination area 42 formed by the light source incidence of the micro-image-text unit for the second time forms a second set of Fourier transform spectrum of the micro-image-text array at the image point of the light source; the second set of fourier spectra from the image points of the respective light sources on the image plane 5 continue to propagate to form a second set of moire images 7.
As shown in fig. 6, when the light source is turned off, the moire image 7 and the moire image 8 displayed by the imaging system 11 disappear and are invisible.
Based on the light response characteristics, the device can be used for a safety device to carry out safety identification verification. Or for information and image processing, packaging decoration, etc.
Example four
The present embodiment provides a dual imaging system and method of fourier transform array, as shown in fig. 7-9, and fig. 7 includes a light source 1, a focusing element array layer 2, a substrate layer 3, a micro-pattern array layer 4, and a reflective layer 9. The focusing element array layer 2, the substrate layer 3, the micro-image-text array layer 4 and the reflecting layer 9 are bonded in sequence. The light source 1 forms an image plane 5 of the light source at a distance F from the array of focusing elements by means of the array of focusing elements 2, which image plane of the light source consists of a series of image points 6 of the light source. The micro graphic array is positioned between the focusing element array layer and the substrate layer. The focusing element array layer 2 is formed by orthogonally arranging circular caliber spherical lens units with focal length f, and the central distance between adjacent lenses is T. The micro-image-text array layer 4 is obtained by arranging micro-image-text units 40 on a transparent substrate layer. The micro-image-text units correspond to the lens units one by one, and the distance between the adjacent images and texts is T. And an included angle between the symmetry axis of the micro image-text array and the symmetry axis of the focusing element array is 5 degrees.
After light emitted by the light source penetrates through the lens unit, the light enters the micro-image-text unit 40 for the first time to illuminate the area 41 in the micro-image-text unit, the transmitted light is focused at the image point 6 after being reflected by the reflecting layer 9, the light at the image point 6 is continuously transmitted, the light enters the micro-image-text unit for the second time to illuminate the area 42 in the micro-image-text unit, and then the light is converged and emitted again through the lens.
The first incidence of the light source on the illuminated area 41 formed by the microimage-text elements forms a first set of fourier transform spectra of the microimage-text array at the image point of the light source. The first set of fourier spectra from the image points of the respective light sources at the image plane 5 are propagated to form a first set of moire images 8.
The illumination area 42 formed by the light source for the second time entering the micro-graphic and text unit forms a second set of Fourier transform spectrum of the micro-graphic and text array at infinity; the second set of fourier spectra from the image points of the respective light sources on the image plane 5 continue to propagate to form a second set of moire images 7.
As shown in fig. 8, when the light source is translated in a plane parallel to the imaging system 11, the displayed moir image 7 and moir image 8 are translated in a direction orthogonal thereto.
As shown in fig. 9, when the light source is translated in a plane parallel to the imaging system 11, the displayed moire image 7 and moire image 8 are rotated in a direction around the optical axis thereof.
Based on the light response characteristics, the device can be used for a safety device to carry out safety identification verification. Or for information and image processing, packaging decoration, etc.
EXAMPLE five
The present embodiment provides a dual imaging system and method of fourier transform array, as shown in fig. 10-11, and as shown in fig. 9, includes a light source 1, a focusing element array layer 2, a substrate layer 3, and a micro-pattern array layer 4. The focusing element array layer 2, the substrate layer 3 and the micro-image-text array layer 4 are sequentially bonded. The light source 1 emits parallel light rays through the focusing element array layer 2 to form an image plane 5 of the light source at the focal plane of the focusing element, which consists of a series of image points 6 of the light source. The micro-teletext array is located at a distance of g = 0.5F from the light source image plane 5. The focusing element array layer 2 is formed by orthogonally arranging square caliber aspheric mirror units with the focal length of f, and the array period is T. The micro-image-text array layer 4 is obtained by arranging micro-image-text units 40 on a transparent substrate layer. The micro graphic and text units are arranged orthogonally, and the array period is different from that of the focusing element and is 0.998T. The symmetry axis of the micro-image-text array and the symmetry axis of the focusing element array are parallel to each other.
Parallel light rays emitted by the light source are firstly incident on the micro graphic and text unit 40 to illuminate an area 41 in the micro graphic and text unit, and after the transmitted light rays are reflected by the focusing element array layer, the parallel light rays are secondly incident on the micro graphic and text unit to illuminate an area 42 in the micro graphic and text unit and are converged at an image point 6 of the light source. The first incidence of the light source on the illuminated area 41 formed by the microimage-text elements forms a first set of fourier transform spectra of the microimage-text array at the image point of the light source. The first set of fourier spectra from the image points of the respective light sources at the image plane 5 are propagated to form a first set of moire images 8.
Parallel light rays emitted by the light source are incident on an illumination area 42 formed by the micro graphic and text units for the second time, and a second set of Fourier transform spectrums of the micro graphic and text array are formed at the image point of the light source; the second set of fourier spectra from the image points of the respective light sources on the image plane 5 continue to propagate to form a second set of moire images 7.
As shown in fig. 11, when the incidence angle of the light emitted from the light source is changed, the moire image 7 and the moire image 8 displayed by the imaging system 11 are translated in a plane.
Based on the light response characteristics, the device can be used for a safety device to carry out safety identification verification. Or for information and image processing, packaging decoration, etc.
Claims (8)
1. A dual imaging method of Fourier transform array, characterized in that the method is realized by a Fourier transform array system formed by a light source and an array of focusing elements; the Fourier transform array system comprises a light source, a focusing element array and a micro-image-text array; the micro image-text array is composed of pixel units, wherein the pixel units are weak scattering units, the pixel units form the micro image-text array with a graph to be imaged, and the micro image-text array is not positioned on an image plane of a light source; carrying out Fourier transform Moire imaging on the micro graphic and text array by utilizing the Fourier transform array system; the light emitted by the light source passes through the micro image-text array twice, the light emitted by the light source passes through the micro image-text array for the first time, and a first set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source; the light rays pass through the micro image-text array for the first time and then are reflected by the focusing element array to pass through the micro image-text array for the second time, and a second set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source or at infinity; propagating the first set of Fourier transform spectra at each source image point to form a first set of magnified moire images; the second set of Fourier transformed spectra at each source image point propagate to form a second set of magnified moir images.
2. The dual imaging method of fourier transform array of claim 1, wherein the dual imaging method is used in information and image processing, security, packaging decoration.
3. A dual imaging system of Fourier transform array, comprising a light source, an array of focusing elements and a micro-image array; the light source and the focusing element array form a Fourier transform array system, the micro image-text array consists of pixel units, the pixel units are weak scattering units, the pixel units form a micro image-text array with a graph to be imaged, and the micro image-text array is not on an image plane of the light source; the light emitted by the light source passes through the micro image-text array twice, the light emitted by the light source passes through the micro image-text array for the first time, and a first set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source; the light rays pass through the micro image-text array for the first time and then are reflected by the focusing element array to pass through the micro image-text array for the second time, and a second set of Fourier transform spectrums of the micro image-text array is formed at the image point of the light source or at infinity; propagating the first set of Fourier transform spectra at each source image point to form a first set of magnified moire images; the second set of Fourier transform spectra at each source image point propagates to form a second set of magnified moire images, the sources being point sources or collimated sources.
4. The system of claim 3, wherein the ratio of scattered light to directly transmitted light of the weakly scattering unit is 1: and 9 or less.
5. The system of claim 3, wherein the focusing element units in the focusing element array are arranged in a manner comprising: orthogonal arrangement with symmetry axis, honeycomb arrangement, low symmetry arrangement without symmetry axis or random arrangement; the arrangement mode of the micro graphic and text array is the same as that of the focusing element array.
6. The system of claim 3, wherein the focusing element array unit employs cylindrical micro lenses, spherical lenses, aspherical lenses or Fresnel lenses; the aperture of the focusing element array unit is circular, square, rectangular, hexagonal or other polygonal shape.
7. The system of claim 3, further comprising a substrate layer for holding the array of focusing elements and the array of microimages.
8. The dual imaging system of claim 3, wherein said dual imaging system is used in information and image processing, security, packaging decoration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810061952.2A CN108254938B (en) | 2018-01-23 | 2018-01-23 | Double imaging method and system of Fourier transform array and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810061952.2A CN108254938B (en) | 2018-01-23 | 2018-01-23 | Double imaging method and system of Fourier transform array and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108254938A CN108254938A (en) | 2018-07-06 |
| CN108254938B true CN108254938B (en) | 2020-11-06 |
Family
ID=62742315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810061952.2A Active CN108254938B (en) | 2018-01-23 | 2018-01-23 | Double imaging method and system of Fourier transform array and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108254938B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101379423A (en) * | 2005-05-18 | 2009-03-04 | 纳米发明控股有限责任公司 | Image presentation and micro-optic security system |
| CN106864161A (en) * | 2017-01-19 | 2017-06-20 | 浙江理工大学 | A kind of security feature discrimination method and reflection-type safety element film |
-
2018
- 2018-01-23 CN CN201810061952.2A patent/CN108254938B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101379423A (en) * | 2005-05-18 | 2009-03-04 | 纳米发明控股有限责任公司 | Image presentation and micro-optic security system |
| CN106864161A (en) * | 2017-01-19 | 2017-06-20 | 浙江理工大学 | A kind of security feature discrimination method and reflection-type safety element film |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108254938A (en) | 2018-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108254937B (en) | Double-imaging method, device and application thereof | |
| JP4900618B2 (en) | Imaging element, display device | |
| KR101067941B1 (en) | Optical system | |
| CN108398735B (en) | Directional imaging device, method and application | |
| TWI424200B (en) | Color dividing optical device and image apparatus with the application | |
| US7965448B2 (en) | Floating image interaction device and its program | |
| JP6714514B2 (en) | Autostereoscopic 3D display device using holographic optical element | |
| EP3553588A1 (en) | System for use in imageing in air | |
| RU2009108005A (en) | METHOD AND DEVICE FOR LIGHTING | |
| US9719655B2 (en) | Optical device with micro sized facets, lens, lighting device, system and method having the same | |
| CN103995312A (en) | Light guide plate, double-vision backlight module and double-vision display device | |
| US9851069B2 (en) | Lighting device, lens, system and method | |
| US6226127B1 (en) | Optical images | |
| CN110262051B (en) | Retroreflective stereoscopic display device based on directional light source | |
| CN109375381B (en) | Three-dimensional display method and system with high information flux and low crosstalk | |
| CN106864161B (en) | Security feature identification method and reflective security element film | |
| CN103488036A (en) | Holographic solid projection screen and projection method | |
| CN110286496B (en) | Stereoscopic display device based on front directional light source | |
| JP2012008301A (en) | Volume-scanning type 3d image display device | |
| US10609266B2 (en) | Camera for wide field of view with an arbitrary aspect ratio | |
| CN106680927B (en) | Light guide plate and backlight device including the same | |
| CN108254938B (en) | Double imaging method and system of Fourier transform array and application thereof | |
| CN113156663B (en) | Optical imaging system and device for suspension display and all-round display equipment | |
| CN108254931B (en) | Display device | |
| JP5283041B2 (en) | Optical element and display system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |