CN115185100A - Method for generating encrypted dot-matrix light field - Google Patents
Method for generating encrypted dot-matrix light field Download PDFInfo
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- CN115185100A CN115185100A CN202210711196.XA CN202210711196A CN115185100A CN 115185100 A CN115185100 A CN 115185100A CN 202210711196 A CN202210711196 A CN 202210711196A CN 115185100 A CN115185100 A CN 115185100A
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/44—Grating systems; Zone plate systems
Abstract
The invention discloses a method for generating an encrypted dot-matrix light field, which comprises a system for generating the dot-matrix light field and a simulation device for generating the dot-matrix light field. The invention determines the number of the light spots of the lattice light field through the image processing algorithm, improves the efficiency of determining the lattice density degree, can obtain the lattice light field with dense lattice distribution under the condition of not changing the grating period, reduces the processing precision requirement on the grating, is easy to realize, and further can improve the performance under various use scenes by the obtained lattice light field with dense lattice distribution.
Description
Technical Field
The invention relates to a method for generating an optical field, in particular to a method for generating an encrypted dot-matrix optical field.
Background
The lattice type light field can be widely applied to various application scenes such as active detection, passive detection, laser processing and the like. The method has wide application prospects in the aspects of military affairs, medical treatment, aerospace, virtual reality, reality enhancement, education and teaching, game entertainment and the like. The dot matrix distribution of the dot matrix light field is more dense, so that the performance of the dot matrix light field under various use scenes can be improved, for example, the spatial resolution is improved in the detection process, and the processing efficiency is improved in the laser processing process.
When generating a dot-matrix light field, a Diffractive Optical Element (DOE) is usually irradiated with a plane wave, so that the plane wave passes through the DOE to generate a light field distribution, and the structure of the light field distribution depends on the phase distribution of the DOE. When optimization algorithms such as a G-S algorithm and the like are adopted to design the phase distribution of the DOE, the zero level of the phase distribution of the DOE is difficult to eliminate due to the influence of processing precision, and due to the interference effect, the speckle phenomenon is caused to be distributed in the light field generated by the DOE, so that the light field is not pure enough, and the energy utilization rate of the light field distribution is low. Further, when a denser dot matrix light field is generated by the DOE, the phase distribution of the DOE needs to be further optimized, and a smaller DOE phase unit size is adopted, so that higher processing accuracy is required, the processing cost is high, and the yield is low.
Disclosure of Invention
The embodiment of the application provides a method for generating an encrypted dot matrix light field, which can obtain the dot matrix light field with dense dot matrix distribution, reduces the processing precision requirement on a grating, and is easy to realize.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for generating an encrypted dot-matrix light field, comprising: generating a diffused light wave; enabling the diffused light wave to pass through a first grating, and generating a first dot matrix light field on a first observation plane, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value; determining a second grating according to the first grating and an optimization algorithm, wherein the grating period of the second grating is the same as that of the first grating, and the grating transmittance function of the second grating is different from that of the first grating; and passing the diffused light wave through the second grating to generate a second dot-matrix light field on the first observation plane, wherein the number of second light spots of the second dot-matrix light field in the unit area is a second value, and the first value is smaller than the second value.
In the technical scheme of the embodiment of the application, under the condition that the period of the grating does not need to be changed, the lattice type light field with dense lattice distribution can be obtained, the requirement on the processing precision of the grating is reduced, and the grating is easy to realize. Furthermore, the obtained lattice-type light field with dense lattice distribution can improve the performance under various use scenes, such as the spatial resolution in the detection process.
In one possible embodiment, the generating the diffused light wave comprises: passing a light source through a lens to generate the diffused light wave.
In the technical scheme of this application embodiment, generate the diffusion light wave through the mode that light source and lens combined together, can realize the regulation to the angular spectrum size of diffusion light wave to be convenient for generate the lattice formula light field that the dot matrix distributes more densely.
In a possible embodiment, the number of the first light spots of the first patterned light field is a first value, and the method includes: determining the number of first light spots of the first dot matrix light field as the first numerical value according to a Fresnel integral formula; or, according to an image processing algorithm, determining the number of the first light spots of the first lattice type light field as the first numerical value.
In the technical scheme of this application embodiment, through image processing algorithm, confirm the quantity of the light spot in dot matrix light field, promoted the efficiency of confirming the dot matrix intensive degree, be convenient for generate the dot matrix light field that the dot matrix distributes more densely.
In a possible embodiment, the number of the second light spots of the second lattice light field is a second numerical value, comprising: determining the number of second light spots of the second dot-matrix light field as the second numerical value according to a Fresnel integral formula; or, according to an image processing algorithm, determining the number of the second light spots of the second lattice light field as the second numerical value.
In the technical scheme of this application embodiment, through image processing algorithm, confirm the quantity of the light spot in dot matrix light field, promoted the efficiency of confirming the dot matrix intensive degree, be convenient for generate the dot matrix light field that the dot matrix distributes more densely.
In one possible embodiment, the optimization algorithm comprises an exhaustive method.
In one possible embodiment, the lens includes any one of a concave lens, a convex lens, and a lens group.
In one possible embodiment, the grating transmittance function may be varied by varying the grating duty cycle.
In a possible embodiment, the wavelength of the diffused light wave may be determined according to the application scenario of the method, for example, when the method is used for face recognition, the wavelength of the diffused light wave is in the infrared band. Optionally, the wavelength of the diffused light wave is 532nm.
In a possible embodiment, the grating period of the first grating and the grating period of the second grating are both 10-1000 times the wavelength of the diffused light wave, e.g. the grating period is 16 μm; the grating duty cycle in any dimension of the first grating is 0.3-0.5, such as 0.37, the grating duty cycle in any dimension of the second grating is 0.5-0.55, such as 0.51, and/or the grating duty cycle in any dimension of the second grating is 0.06-0.1, such as 0.08.
In one possible embodiment, the distance between the center of the diffusion of the wave front phase of the diffused light wave and the first or second grating is greater than or equal to 0.5mm, for example 0.813mm.
In a possible embodiment, the distance between the first observation plane and the first or second grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
In a second aspect, a system for generating a lattice light field is provided, comprising: the grating period of the first grating is the same as the grating period of the second grating, and the grating transmittance function of the first grating is different from the grating transmittance function of the second grating, specifically: the light source is used for generating diffused light waves; the first grating is used for generating a first dot matrix light field on a first observation plane through the diffused light wave, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value; the second grating is configured to generate a second dot-matrix light field on the first observation plane through the diffused light wave, where the number of second light spots in the second dot-matrix light field in the unit area is a second value, and the first value is smaller than the second value.
In a possible embodiment, the system further comprises a lens, the light source being configured to generate a diffused light wave, in particular: the light source is used for generating the diffused light wave through the lens.
In a possible embodiment, the lens comprises any one of a concave lens, a convex lens, and a lens group.
In one possible embodiment, the grating transmittance function may be varied by varying the grating duty cycle.
In a possible embodiment, the wavelength of the diffused light wave may be determined according to the application scenario of the system, for example, when the system is used for face recognition, the wavelength of the diffused light wave is in the infrared band. Optionally, the wavelength of the diffused light wave is 532nm.
In one possible embodiment, the grating period of the first grating and the grating period of the second grating are both 10-1000 times the wavelength of the diffused light wave, e.g. the grating period is 16 μm; the grating duty cycle in any dimension of the first grating is 0.3-0.5, such as 0.37, the grating duty cycle in any dimension of the second grating is 0.5-0.55, such as 0.51, and/or the grating duty cycle in any dimension of the second grating is 0.06-0.1, such as 0.08.
In one possible embodiment, the distance between the center of the diffusion of the wave front phase of the diffused light wave and the first or second grating is greater than or equal to 0.5mm, for example 0.813mm.
In a possible embodiment, the distance between the first observation plane and the first or second grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
In a third aspect, a simulation apparatus for generating a lattice-type light field is provided, which includes: a first processing module for generating a diffused light wave; the second processing module is used for enabling the diffused light wave to pass through a first grating and generating a first dot matrix light field on a first observation plane, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value; the third processing module is used for determining a second grating according to the first grating and an optimization algorithm, wherein the grating period of the second grating is the same as that of the first grating, and the grating transmittance function of the second grating is different from that of the first grating; and a fourth processing module, configured to pass the diffused light wave through the second grating, and generate a second dot-matrix light field on the first observation plane, where in the unit area, the number of second light spots in the second dot-matrix light field is a second numerical value, and the first numerical value is smaller than the second numerical value.
In a possible implementation, the first processing module is configured to generate a diffused light wave, and the first processing module is specifically configured to: passing a light source through a lens to generate the diffused light wave.
In a possible implementation manner, the number of the first light spots of the first patterned light field is a first value, and the second processing module is specifically configured to: determining the number of first light spots of the first dot matrix light field as the first numerical value according to a Fresnel integral formula; or, determining the number of the first light spots of the first dot matrix light field as the first numerical value according to an image processing algorithm.
In a possible implementation manner, the number of the second light spots of the second lattice light field is a second numerical value, and the fourth processing module is specifically configured to: determining the number of second light spots of the second dot-matrix light field as the second numerical value according to a Fresnel integral formula; or, determining the number of the second light spots of the second lattice light field as the second numerical value according to an image processing algorithm.
In one possible embodiment, the optimization algorithm comprises an exhaustive method.
In one possible embodiment, the lens includes any one of a concave lens, a convex lens, and a lens group.
In one possible embodiment, the grating transmittance function may be varied by varying the grating duty cycle.
In a possible embodiment, the first processing module is further configured to determine the wavelength of the diffused light wave according to an application scenario of the simulation apparatus, for example, when the simulation apparatus is used for face recognition, the first processing module determines that the wavelength of the diffused light wave is in an infrared band. Optionally, the first processing module determines that the wavelength of the diffused light wave is 532nm.
In a possible implementation, the second processing module is further configured to determine: the grating period of the first grating is 10-1000 times the wavelength of the diffused light wave, for example, the grating period is 16 μm; the grating duty cycle in either dimension of the first grating is 0.3-0.5, for example 0.37.
In a possible implementation, the third processing module is further configured to determine: the grating period of the second grating is 10-1000 times the wavelength of the diffused light wave, for example, the grating period is 16 μm; the grating duty cycle in either dimension of the second grating is 0.5-0.55, such as 0.51, and/or the grating duty cycle in either dimension of the second grating is 0.06-0.1, such as 0.08.
In a possible implementation, the second processing module or the fourth processing module is further configured to determine: the distance between the diffusion center of the wave front phase of the diffused light wave and the first grating or the second grating is greater than or equal to 0.5mm, for example, 0.813mm.
In a possible implementation, the second processing module or the fourth processing module is further configured to determine: the distance between the first observation plane and the first grating or the second grating is greater than or equal to 1000 times of the wavelength, for example, 0.5m.
In a fourth aspect, there is provided a computer device comprising a memory and a processor, the memory comprising a computer program running on the processor; the processor executes the computer program to implement the method of the first aspect or any one of the possible implementations of the first aspect.
In a fifth aspect, a chip is provided, which includes a processor and a communication interface, where the communication interface is configured to receive data and/or information and transmit the received data and/or information to the processor, and the processor processes the data and/or information according to the method described in the first aspect or any one of the possible implementation manners of the first aspect.
A sixth aspect provides a computer readable medium having stored program code means for causing a computer to perform the method of the first aspect or any one of the possible implementations of the first aspect when the computer program code means are run on a computer. These computer-readable memories include, but are not limited to, one or more of the following: read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), flash memory, electrically EPROM (EEPROM), and hard drive (hard drive).
In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program code for causing a computer to perform the method of the first aspect or any one of the possible implementations of the first aspect, when the computer program code runs on a computer.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the technical scheme of the embodiment of the application, the lattice type light field with dense lattice distribution can be obtained without changing the grating period, the requirement on the processing precision of the grating is lowered, the implementation is easy, and the performance under various use scenes can be improved due to the obtained lattice type light field with dense lattice distribution, such as the improvement of the spatial resolution in the detection process;
2. in the technical scheme of the embodiment of the application, the diffused light wave is generated in a mode of combining the light source and the lens, and the adjustment of the angular spectrum size of the diffused light wave can be realized, so that lattice type light with more dense lattice distribution can be generated conveniently;
3. in the technical scheme of this application embodiment, through image processing algorithm, confirm the quantity of the light spot of dot matrix light field, promoted the efficiency of confirming the dot matrix degree of concentration, be convenient for generate the dot matrix light field that the dot matrix distributes more densely.
Description of the drawings:
fig. 1 is a schematic structural diagram of an application scenario applicable to an embodiment of the present application.
Fig. 2 is a schematic flowchart of a method for generating an encrypted dot-matrix light field according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a system for generating an encrypted lattice light field according to an embodiment of the present application.
Fig. 4 is a schematic diagram of an exemplary system for generating an encrypted lattice light field according to an embodiment of the present application.
Fig. 5 is a schematic diagram of an exemplary system for generating an encrypted lattice light field according to an embodiment of the present application.
Fig. 6 is a light field image generated by a method or system provided by an embodiment of the present application.
Fig. 7 is a light field image generated by a method or system provided by an embodiment of the present application.
Fig. 8 is a light field image generated by a method or system provided by an embodiment of the present application.
Fig. 9 is a schematic diagram of an analog apparatus for generating an encrypted lattice light field according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
It should be understood that the embodiments of the present application may be applied to optical systems, including but not limited to optical simulation systems and products based on optical imaging, and the embodiments of the present application are only described by way of example, but should not be construed as limiting in any way, and the embodiments of the present application are also applicable to other systems using optical imaging technology, etc.
Example 1
As shown in fig. 1, the system 100 is used for generating a light field, and includes a light source 101, a grating 102 and an observation plane 103, wherein the light source 101 passes through the grating 102, and a light field, for example, a lattice light field 104, can be generated on the observation plane 103.
It should be understood that the kinds of gratings are various, and the gratings may be classified into an amplitude type grating, a pure phase type grating, a complex amplitude type grating, a binary type grating, a multi-step type grating, a continuous distribution type grating, and the like according to the transmittance function of the grating.
It should also be understood that the light field may be generated by passing the light wave through the grating, and the generation of the light wave may be directly generated by the light source, or the light wave may also be generated by combining the light source and the lens, which is not limited in this embodiment.
Fig. 2 shows a flowchart of a method for generating an encrypted dot-matrix light field according to an embodiment of the present application, and specifically, the method 200 includes: s201, generating a diffused light wave.
Specifically, in the embodiments of the present application, there are various methods for generating the diffused light wave, and optionally, the diffused light wave may be generated by a light source, and the light source may also be passed through a lens to generate the diffused light wave, which is not limited in this application.
In a possible implementation manner, the wavelength of the diffused light wave may be determined according to an application scenario of the above method, for example, when the above method is used for face recognition, the wavelength of the diffused light wave may be an infrared band. Optionally, the wavelength of the diffused light wave is 532nm. This is not a limitation of the present application.
It should be understood that the lens may include any one of a concave lens, a convex lens and a lens group, which is not limited in the present application. It is also understood that a lens group means a combination of at least one lens.
It is also understood that the lens is a lens capable of changing the angular spectrum component of the laser light source when a diffused light wave is generated by the light source through the lens such that the light source passes through the lens to become a diffused light wave. For example, passing a laser light source through a concave lens causes an increase in the angular spectral content of the light wave passing through the grating, i.e. a diffused light wave is generated.
And S202, enabling the diffused light wave to pass through a first grating, and generating a first dot matrix light field on a first observation plane, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value.
Specifically, in the embodiment of the present application, the diffused light wave is irradiated on the first grating so that the diffused light wave passes through the first grating, thereby enabling generation of the first lattice light field on the first observation plane. And determining the number of first spots in the first patterned field per unit area to be a first value.
It is to be understood that the size of the unit area may be any value, for example, 10mm × 10mm, and also 100mm × 100mm. This is not a limitation of the present application. It will also be appreciated that the first spot is a spot in the first patterned light field where the light field intensity is greater, for example where the light field intensity of the first spot is the maximum value of the light field intensity in the first patterned light field, and for example where the light field intensity of the first spot is greater than 80% of the maximum value of the light field intensity in the first patterned light field. This is not a limitation of the present application.
In a possible implementation, the distance between the center of diffusion of the wavefront phase of the diffused light wave and the first grating is greater than or equal to 0.5mm, for example 0.813mm.
In another possible implementation, the distance between the first observation plane and the first grating is greater than or equal to 1000 times the wavelength, for example, 0.5m.
Alternatively, the method of determining the number of first spots of the first patterned light field may be any of the following:
1) And determining the number of the first light spots of the first lattice type light field as a first numerical value according to a Fresnel integral formula. It should be understood that this method may be understood as a calculation method, wherein the number of first light spots of the first patterned light field is calculated as a first value according to the fresnel integration formula.
2) According to an image processing algorithm, the number of first light spots of the first lattice light field is determined to be a first value. It should be understood that the method may specifically be that information such as peak intensity, width, position, etc. in the dot matrix light field distribution is extracted through an image processing algorithm, and it is determined that the number of the first light spots of the first dot matrix light field is the first numerical value.
S203, determining a second grating according to the first grating and the optimization algorithm, wherein the grating period of the second grating is the same as that of the first grating, and the grating transmittance function of the second grating is different from that of the first grating.
Specifically, in the embodiment of the present application, the optimization algorithm may be an exhaustive method. After the second grating is obtained by changing the grating transmittance function of the first grating, that is, exhausting the grating transmittance function under the condition of ensuring that the grating period is not changed, the diffused light wave passes through the second grating, and a lattice-type light field with denser lattice distribution is obtained, that is, the following step S204.
In a possible implementation, the grating period of the first grating and the grating period of the second grating are both 10-1000 times the wavelength of the diffused light wave, for example, the grating period is 16 μm.
Alternatively, the change in the grating transmittance function may be obtained by changing the grating duty cycle.
In another possible implementation manner, the first grating and the second grating are both two-dimensional gratings, and the duty cycles of the gratings in the two dimensional directions may be the same or different. In other words, the grating duty cycles in the first dimension direction and the second dimension direction of the first grating may be the same or different; similarly, the grating duty cycle in the first dimension direction and the second dimension direction of the second grating may be the same or different.
Optionally, the value of the grating duty ratio in any dimension direction of the two-dimensional grating may be: the grating duty cycle of the first grating is 0.3-0.5, for example 0.37; the grating duty cycle of the second grating is 0.5-0.55, such as 0.51, and/or the grating duty cycle of the second grating is 0.06-0.1, such as 0.08. This is not a limitation of the present application.
And S204, enabling the diffused light wave to pass through a second grating, and generating a second dot-matrix light field on the first observation plane, wherein the number of second light spots in the second dot-matrix light field is a second numerical value in a unit area, and the first numerical value is smaller than the second numerical value.
In particular, in the embodiment of the present application, when generating the second lattice light field, the point of difference from the first lattice light field is different in the grating transmittance function, and the first grating is replaced with the second grating, and the position of the second grating with respect to the diffused light wave is the same as the position of the first grating with respect to the diffused light wave. Therefore, under the condition of ensuring that other conditions are not changed, the grating transmittance is changed, and a lattice type light field with dense lattice distribution, namely a second lattice type light field, is generated.
It is to be understood that the second spot is a spot in the second light field matrix where the light field intensity is larger, e.g. the light field intensity of the second spot is the maximum value of the light field intensity in the second light field matrix, and further e.g. the light field intensity of the second spot is larger than 80%, or 85%, or 90% of the maximum value of the light field intensity in the second light field matrix. This is not a limitation of the present application.
In a possible implementation, the distance between the center of diffusion of the wavefront phase of the diffused light wave and the second grating is greater than or equal to 0.5mm, for example 0.813mm.
In another possible implementation, the distance between the first observation plane and the second grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
Alternatively, the method of determining the number of second spots of the second lattice light field may be any of the following:
1) And determining the number of the second light spots of the second lattice type light field as a second numerical value according to a Fresnel integral formula. It should be understood that this method may be understood as a calculation method, wherein the number of second light spots of the second lattice light field is calculated as a second value according to the fresnel integration formula.
2) And determining the number of the second light spots of the second lattice light field as a second numerical value according to an image processing algorithm. It should be understood that, in this method, information such as peak intensity, width, position, etc. in the dot matrix light field distribution may be extracted through an image processing algorithm, and the number of the second light spots in the second dot matrix light field is determined to be the second value.
It should be understood that the image processing algorithm may be an image feature extraction method.
Therefore, by the method, a dense dot-matrix optical field can be generated without changing the grating period, the requirement on the processing precision of the grating is low, and the optical field is pure, so that the performance under various use scenes can be improved, for example, the spatial resolution in the detection process is improved.
It should be understood that, in the embodiment of the present application, taking a one-dimensional grating as an example, the fresnel integral formula may be:
where E denotes the complex amplitude of the light field, z denotes a coordinate value in a direction perpendicular to the grating surface, x denotes a coordinate value in a direction perpendicular to z, that is, a coordinate value in a direction in which the light field varies periodically, a denotes the amplitude of the diffused light wave, j denotes an imaginary unit indicating a wave number, r denotes a distance between the diffusion center of the phase before the diffused light wave and the grating center, x0 denotes a coordinate value in a direction in which the grating surface is periodically arranged, and t (x 0) denotes a transmittance function of the grating.
Fig. 3 shows a schematic structural diagram of a system for generating a lattice-type light field according to an embodiment of the present application, where the system 300 includes a light source 301, a grating 303, and an observation plane 304. Optionally, a lens 302 may also be included. The light source may be a laser light source, and in this case, the lens may be a lens capable of increasing an angular spectrum component of the laser light source so that the laser light source passes through the lens and becomes a diffusion type light wave.
Alternatively, the lens may be a concave lens, a convex lens, or a lens group, which is not limited in the present application.
It should be noted that, among the functions that can be realized by the system shown in fig. 3, the specific implementation manner of a part of the functions is the same as that of the method in fig. 2, and is not described again here.
In the above system, the light source 301 is used to generate a diffused light wave. Alternatively, the light source may generate a diffused light wave after passing through the lens. For a specific way of generating the diffused light wave, reference may be made to the detailed description in step S201 of the method 200, and details are not repeated here.
In the above system, the grating 303 includes a first grating and a second grating, a grating period of the first grating is the same as a grating period of the second grating, and a grating transmittance function of the first grating is different from a grating transmittance function of the second grating, specifically:
the first grating is used for generating a first dot-matrix light field on a first observation plane through diffusing light waves, wherein the number of first light spots of the first dot-matrix light field in a unit area is a first numerical value;
the second grating is used for generating a second dot-matrix light field on the first observation plane through the diffused light waves, wherein the number of second light spots of the second dot-matrix light field is a second numerical value in a unit area, and the first numerical value is smaller than the second numerical value.
Regarding the determination manner of the grating transmittance function of the second grating, the number of the first light spots of the first lattice light field, and the number of the second light spots of the second lattice light field, reference may be made to steps S202 to S204 in the method 200, which is not described herein again.
In the method and system for generating a dot matrix light field according to the embodiments of the present application, details related to generating the dot matrix light field when the light source generates the diffused light wave through the lens are described below with reference to fig. 4 to 8.
It should be noted that, in the following related contents of fig. 4 to 8, the first grating and the second grating are both pure phase type two-dimensional gratings with a phase distribution of 0 and a pi structure, and the grating duty ratios in different dimension directions of the first grating are the same, and the grating duty ratios in different dimension directions of the second grating are the same. Fig. 4 and 5 correspond to a method and system for generating a diffused light wave by a light source through a convex lens and a concave lens, respectively.
Fig. 4 is a schematic diagram of an exemplary system for generating a lattice light field according to an embodiment of the present application. As shown in fig. 4, the system 400 includes a light source 401, a convex lens 402, a grating 403, and an observation plane 404. For functional description of each component in the system, reference is made to the related description in fig. 3, and the description is omitted here.
Fig. 5 is a schematic diagram illustrating an exemplary system for generating a lattice light field according to an embodiment of the present application. As shown in fig. 5, the system 500 includes a light source 501, a concave lens 502, a grating 503, and an observation plane 504. The functional description of the various components in the system can refer to the description in fig. 3, and the description is omitted here.
In a possible implementation, the wavelength of the diffused light wave may be set to 532nm, the grating period is 16 μm, and r is 0.813mm, in this case, when z =0.3m, the light field period of the generated dot-matrix light field is 5.9mm; when z =0.4m, the light field period of the generated dot matrix light field is 7.9mm; when z =0.5m, the light field period of the generated lattice light field is 9.9mm.
It should be understood that in the above possible implementation manner, by changing the duty ratio of the grating, the lattice type light field with different lattice distribution densities can be obtained. See, in particular, the following description of fig. 6-8.
Fig. 6 illustrates a light field image generated by a method or system provided by an embodiment of the present application. As shown in (a) and (b) of fig. 6, when the grating duty ratio in both dimensional directions of the grating is 0.37 and z =0.5m, respectively, the light-field one-dimensional image and the light-field two-dimensional image are generated.
Fig. 7 illustrates a light field image generated by a method or system provided by an embodiment of the present application. As shown in (a) and (b) of fig. 7, the light field one-dimensional image and the light field two-dimensional image generated when the grating duty ratio in both dimensional directions of the grating is 0.51 and z =0.5m are shown, respectively.
Fig. 8 illustrates a light field image generated by a method or system provided by an embodiment of the present application. As shown in (a) and (b) of fig. 8, the light field one-dimensional image and the light field two-dimensional image generated when the grating duty ratio in both dimensional directions of the grating is 0.08 and z =0.5m are shown, respectively.
It is to be understood that the corresponding grating of fig. 6 may be understood as a first grating and the corresponding grating of fig. 7, 8 may be understood as a second grating. That is, by using the grating parameters shown in fig. 6 as a reference and changing the grating transmittance function, a lattice light field with more dense lattice distribution, that is, the lattice light field shown in fig. 7-8, can be obtained.
Therefore, as can be seen from fig. 6 to 8, the lattice-type optical field with denser lattice distribution can be generated by changing the duty ratio of the grating under the condition that other conditions are not changed.
An apparatus and a computer device for generating a dot-matrix light field according to embodiments of the present application are described below with reference to fig. 9 and fig. 10.
Example 2
Fig. 9 shows a schematic diagram of an analog apparatus for generating a dot matrix light field according to an embodiment of the present application. As shown in fig. 9, the simulation apparatus 900 includes a first processing module 901, a second processing module 902, a third processing module 903, and a fourth processing module 904. The first processing module is used for generating diffused light waves; the second processing module is used for enabling the diffused light waves to pass through the first grating and generating a first dot matrix light field on the first observation plane, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value; the third processing module is used for determining a second grating according to the first grating and the optimization algorithm, wherein the grating period of the second grating is the same as that of the first grating, and the grating transmittance function of the second grating is different from that of the first grating; and the fourth processing module is used for enabling the diffused light wave to pass through the second grating and generating a second dot matrix light field on the first observation plane, wherein in unit area, the number of second light spots of the second dot matrix light field is a second numerical value, and the first numerical value is smaller than the second numerical value.
For specific functions of the first to fourth processing modules, reference may be made to the detailed description of the method embodiments, which is not repeated herein.
Example 3
Fig. 10 shows a schematic structural diagram of a computer device according to an embodiment of the present application. As shown in fig. 10, the computer device 1000 comprises a memory 1001 and a processor 1002, wherein the memory 1001 comprises a computer program that can be run on the processor; the processor executes the computer program, so that the relevant content in the above-mentioned method embodiments can be realized. And will not be described in detail herein.
Example 4
Embodiments of the present application further provide a computer-readable medium, which stores program code and when the computer program code runs on a computer, causes the computer to execute the method in the above method embodiments. These computer-readable memories include, but are not limited to, one or more of the following: read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), flash memory, electrically EPROM (EEPROM), and hard drive (hard drive).
Example 5
An embodiment of the present application further provides a chip system, where the chip system includes: the chip system comprises at least one processor, at least one memory and an interface circuit, wherein the interface circuit is responsible for information interaction between the chip system and the outside, the at least one memory, the interface circuit and the at least one processor are interconnected through lines, and instructions are stored in the at least one memory; the instructions are executable by the at least one processor to perform the operations involved in the methods of the various aspects described above. In a specific implementation process, the chip system may be implemented in the form of a Central Processing Unit (CPU), a Micro Controller Unit (MCU), a microprocessor unit (MPU), a Digital Signal Processor (DSP), a system on chip (SoC), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Programmable Logic Device (PLD).
Example 6
Embodiments of the present application also provide a computer program product, which includes a series of instructions for performing the operations in the method according to the above aspects when the instructions are executed.
As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another at a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for generating an encrypted dot-matrix light field, comprising: generating a diffused light wave; enabling the diffused light wave to pass through a first grating, and generating a first dot matrix light field on a first observation plane, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value; determining a second grating according to the first grating and an optimization algorithm, wherein the grating period of the second grating is the same as that of the first grating, and the grating transmittance function of the second grating is different from that of the first grating; passing the diffused light wave through the second grating to generate a second dot-matrix light field on the first observation plane, wherein the number of second light spots of the second dot-matrix light field in the unit area is a second value, and the first value is smaller than the second value;
the generating a diffused light wave includes: the light source generates the diffused light wave through the lens, and the diffused light wave is generated in a mode of combining the light source and the lens, so that the adjustment of the angular spectrum size of the diffused light wave can be realized, and the generation of a dot matrix light field with denser dot matrix distribution is facilitated;
the number of first spots of the first patterned light field is a first number comprising: determining the number of first light spots of the first dot matrix light field as the first numerical value according to a Fresnel integral formula; determining the number of first light spots of the first dot matrix light field as the first numerical value according to an image processing algorithm;
the number of second light spots of the second lattice light field is a second numerical value, comprising: determining the number of second light spots of the second dot-matrix light field as the second numerical value according to a Fresnel integral formula; or, according to an image processing algorithm, determining the number of the second light spots of the second lattice light field as the second numerical value.
2. A method for generating an encrypted light field in a matrix according to claim 1, wherein a system for generating a light field in a matrix is provided, comprising: the grating period of the first grating is the same as the grating period of the second grating, and the grating transmittance function of the first grating is different from the grating transmittance function of the second grating, specifically: the light source is used for generating diffused light waves; the first grating is used for generating a first dot matrix light field on a first observation plane through the diffused light wave, wherein the number of first light spots of the first dot matrix light field in a unit area is a first numerical value; the second grating is configured to generate a second dot-matrix light field on the first observation plane through the diffused light wave, where the number of second light spots in the second dot-matrix light field per unit area is a second value, and the first value is smaller than the second value;
the system also includes a lens, the light source for generating a diffused light wave, the light source for generating the diffused light wave through the lens.
3. The method of claim 1, wherein an analog device for generating a dot matrix light field is provided, comprising: a first processing module for generating a diffused light wave; the second processing module is used for enabling the diffused light wave to pass through a first grating and generating a first dot-matrix light field on a first observation plane, wherein the number of first light spots of the first dot-matrix light field in a unit area is a first numerical value; the third processing module is used for determining a second grating according to the first grating and an optimization algorithm, wherein the grating period of the second grating is the same as that of the first grating, and the grating transmittance function of the second grating is different from that of the first grating; a fourth processing module, configured to pass the diffused light wave through the second grating, and generate a second dot-matrix light field on the first observation plane, where in the unit area, the number of second light spots of the second dot-matrix light field is a second numerical value, and the first numerical value is smaller than the second numerical value;
the first processing module is configured to generate a diffused light wave, and the first processing module is specifically configured to: passing a light source through a lens to generate the diffused light wave;
the number of the first light spots of the first lattice type light field is a first numerical value, and the second processing module is specifically configured to: determining the number of the first light spots of the first dot-matrix light field as the first numerical value according to a Fresnel integral formula; determining the number of first light spots of the first dot matrix light field as the first numerical value according to an image processing algorithm;
the number of the second light spots of the second lattice light field is a second numerical value, and the fourth processing module is specifically configured to: determining the number of second light spots of the second dot-matrix light field as the second numerical value according to a Fresnel integral formula; and determining the number of the second light spots of the second lattice light field as the second numerical value according to an image processing algorithm.
4. A method for generating an encrypted dot-matrix light field according to claim 1, 2 or 3, wherein the optimization algorithm comprises an exhaustive method, the lens comprises any one of a concave lens, a convex lens and a lens group, the grating transmittance function is obtained by changing a grating duty ratio, and the wavelength of the diffused light wave is determined according to an application scenario of the method;
the wavelength of the diffused light wave is 532nm, the grating period of the first grating and the grating period of the second grating are both 10-1000 times of the wavelength of the diffused light wave, the grating duty ratio in any dimension direction of the first grating is 0.3-0.5, the grating duty ratio in any dimension direction of the second grating is 0.5-0.55, the grating duty ratio in any dimension direction of the second grating is 0.06-0.1, the distance between the diffusion center of the wave front phase of the diffused light wave and the first grating or the second grating is greater than or equal to 0.5mm, and the distance between the first observation plane and the first grating or the second grating is greater than or equal to 1000 times of the wavelength.
5. A method of generating an encrypted light field in a lattice as claimed in claim 1, wherein a computer device is provided, comprising a memory and a processor, said memory comprising a computer program running on said processor; the processor executes the computer program to implement the method of the first aspect or any one of the possible implementations of the first aspect.
6. A method for generating an encrypted light field in a matrix according to claim 1, wherein a chip is provided, comprising a processor and a communication interface, the communication interface is configured to receive data and/or information and transmit the received data and/or information to the processor, and the processor processes the data and/or information according to the method described in the first aspect or any one of the possible embodiments of the first aspect.
7. A method for generating an encrypted light-field matrix according to claim 1, wherein a computer-readable medium is provided, the computer-readable medium storing program code, which when executed on a computer, causes the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.
8. A method of generating an encrypted lattice light field according to claim 1, wherein a computer program product is provided, the computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method as described above in relation to the first aspect or any one of the possible implementations of the first aspect.
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