CN115185100B - Encryption lattice type light field generation method - Google Patents
Encryption lattice type light field generation method Download PDFInfo
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- CN115185100B CN115185100B CN202210711196.XA CN202210711196A CN115185100B CN 115185100 B CN115185100 B CN 115185100B CN 202210711196 A CN202210711196 A CN 202210711196A CN 115185100 B CN115185100 B CN 115185100B
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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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Abstract
The invention discloses a generation method of an encrypted lattice type light field, which comprises a system for generating the lattice type light field and a simulation device for generating the lattice type light field, wherein a light source and a lens are combined to generate a diffusion light wave, so that the angular spectrum of the diffusion light wave can be adjusted, and lattice type light with denser lattice distribution can be generated conveniently. According to the invention, the number of light spots of the dot matrix light field is determined through an image processing algorithm, so that the efficiency of determining the dot matrix density degree is improved, the dot matrix light field with dense dot matrix distribution can be obtained under the condition that the grating period is not required to be changed, the processing precision requirement on the grating is reduced, the realization is easy, and furthermore, the obtained dot matrix light field with dense dot matrix distribution can be improved in performance under various use scenes.
Description
Technical Field
The invention relates to a method for generating a light field, in particular to a method for generating an encrypted dot matrix light 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. Has wide application prospect in military, medical treatment, aerospace, virtual reality, reality augmentation, education and teaching, game entertainment and other aspects. Through changing the lattice distribution of the lattice type light field more densely, the performance of the laser can be improved under various use scenes, such as improving the spatial resolution in the detection process, improving the processing efficiency in the laser processing process, and the like.
In generating a lattice light field, a diffractive optical element (diffractive optical elements, DOE) is typically illuminated with a plane wave such that the plane wave passes through the DOE, generating a light field distribution, the structure of which depends on the phase distribution of the DOE. When the phase distribution of the DOE is designed by adopting an optimization algorithm such as a G-S algorithm, the zero order of the phase distribution of the DOE is difficult to eliminate due to the influence of processing precision, and the optical field distribution generated by the DOE has a speckle phenomenon due to interference, so that the DOE is not pure enough and the energy utilization rate of the optical field distribution is low. Further, when generating a denser lattice light field through 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 precision is required, the processing cost is high, and the yield is low.
Disclosure of Invention
The embodiment of the application provides a generation method of an encrypted lattice type light field, which can obtain a lattice type light field with denser lattice distribution, reduces the processing precision requirement on a grating and is easy to realize.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for generating an encrypted lattice type light field comprises the following steps: generating a diffused light wave; generating a first lattice light field on a first observation plane by passing the diffused light wave through a first grating, wherein the number of first light points of the first lattice 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 the diffused light waves pass through the second grating, and a second lattice light field is generated on the first observation plane, wherein the number of second light spots of the second lattice light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value.
In the technical scheme of the embodiment of the application, under the condition that the grating period does not need to be changed, the lattice light field with denser lattice distribution can be obtained, the processing precision requirement on the grating is reduced, and the implementation is easy. Furthermore, the obtained lattice light field with denser lattice distribution can improve the performance under various use scenes, such as improving the spatial resolution in the detection process.
In one possible embodiment, the generating the diffused light wave includes: and passing a light source through a lens to generate the diffused light wave.
In the technical scheme of the embodiment of the application, the diffuse light wave is generated by combining the light source and the lens, so that the angular spectrum of the diffuse light wave can be adjusted, and the lattice light field with more densely distributed lattice is conveniently generated.
In one possible embodiment, the number of first light points of the first lattice light field is a first value, including: determining the number of first light spots of the first lattice light field as the first numerical value according to a Fresnel integral formula; or determining the number of the first light points of the first lattice light field as the first numerical value according to an image processing algorithm.
In the technical scheme of the embodiment of the application, the number of the light spots of the dot matrix light field is determined through an image processing algorithm, so that the efficiency of determining the dot matrix density degree is improved, and the dot matrix light field with more densely distributed dot matrix is conveniently generated.
In one possible embodiment, the number of the second light spots of the second lattice light field is a second value, including: determining the number of second light spots of the second lattice light field as the second numerical value according to a Fresnel integral formula; or determining the number of second light spots of the second lattice light field as the second numerical value according to an image processing algorithm.
In the technical scheme of the embodiment of the application, the number of the light spots of the dot matrix light field is determined through an image processing algorithm, so that the efficiency of determining the dot matrix density degree is improved, and the dot matrix light field with more densely distributed dot matrix is conveniently generated.
In one possible implementation, 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 implementation, the grating transmissivity function may be varied by varying the grating duty cycle.
In a possible embodiment, the wavelength of the diffuse light wave may be determined according to an application scenario of the method, for example, when the method is used for face recognition, the wavelength of the diffuse light wave is in an 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 each 10-1000 times the wavelength of the diffused light wave, for example the grating period is 16 μm; the grating duty cycle in any one dimension of the first grating is 0.3-0.5, e.g. 0.37, the grating duty cycle in any one dimension of the second grating is 0.5-0.55, e.g. 0.51, and/or the grating duty cycle in any one dimension of the second grating is 0.06-0.1, e.g. 0.08.
In one possible embodiment, the distance between the diffusion center of the wavefront 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 one possible embodiment, the distance between the first viewing plane and the first grating or the second grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
In a second aspect, there is provided a system for generating a lattice light field, comprising: the device comprises a light source, a first grating and a second grating, wherein the grating period of the first grating is the same as that of the second grating, and the grating transmittance function of the first grating is different from that of the second grating, specifically: the light source is used for generating diffusion light waves; the first grating is used for generating a first lattice type light field on a first observation plane through the diffused light waves, wherein the number of first light spots of the first lattice type light field in a unit area is a first numerical value; the second grating is used for generating a second lattice light field on the first observation plane through the diffused light waves, wherein the number of second light spots of the second lattice light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value.
In a possible embodiment, the system further comprises a lens, the light source being adapted to generate a diffuse light wave, in particular: the light source is used for generating the diffusion light waves through the lens.
In one possible embodiment, the lens includes any one of a concave lens, a convex lens, and a lens group.
In one possible implementation, the grating transmissivity function may be varied by varying the grating duty cycle.
In a possible implementation manner, the wavelength of the diffused light wave may be determined according to an application scenario of the system, for example, when the system is used for face recognition, the wavelength of the diffused light wave is in an 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 each 10-1000 times the wavelength of the diffused light wave, for example the grating period is 16 μm; the grating duty cycle in any one dimension of the first grating is 0.3-0.5, e.g. 0.37, the grating duty cycle in any one dimension of the second grating is 0.5-0.55, e.g. 0.51, and/or the grating duty cycle in any one dimension of the second grating is 0.06-0.1, e.g. 0.08.
In one possible embodiment, the distance between the diffusion center of the wavefront 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 one possible embodiment, the distance between the first viewing plane and the first grating or the second grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
In a third aspect, there is provided an analogue device for generating a lattice light field, comprising: the first processing module is used for generating diffusion light waves; the second processing module is used for generating a first lattice light field on a first observation plane through the first grating, wherein the number of first light spots of the first lattice 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 generating a second lattice type light field on the first observation plane by passing the diffused light wave through the second grating, wherein the number of second light spots of the second lattice type light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value.
In one possible embodiment, the first processing module is configured to generate a diffuse light wave, and the first processing module is specifically configured to: and passing a light source through a lens to generate the diffused light wave.
In one possible implementation manner, the number of the first light spots of the first lattice 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 lattice light field as the first numerical value according to a Fresnel integral formula; or determining the number of the first light points of the first lattice 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 value, and the fourth processing module is specifically configured to: determining the number of second light spots of the second lattice light field as the second numerical value according to a Fresnel integral formula; or determining the number of second light spots of the second lattice light field as the second numerical value according to an image processing algorithm.
In one possible implementation, 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 implementation, the grating transmissivity function may be varied by varying the grating duty cycle.
In a possible implementation manner, the first processing module is further configured to determine a wavelength of the diffuse light wave according to an application scenario of the simulation device, for example, when the simulation device is used for face recognition, the first processing module determines that the wavelength of the diffuse light wave is in an infrared band. Optionally, the first processing module determines the wavelength of the diffused light wave to be 532nm.
In one 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 any dimension of the first grating is 0.3-0.5, for example 0.37.
In one 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 any one dimension of the second grating is 0.5-0.55, e.g. 0.51, and/or the grating duty cycle in any one dimension of the second grating is 0.06-0.1, e.g. 0.08.
In one possible embodiment, the second processing module or the fourth processing module is further configured to determine: the distance between the diffusion center of the wavefront phase of the diffused light wave and the first grating or the second grating is 0.5mm or more, for example, 0.813mm.
In one possible embodiment, 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 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 of the possible implementation manners of the first aspect.
In a fifth aspect, a chip is provided, comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing 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.
In a sixth aspect, there is provided a computer readable medium storing program code which, when run on a computer, causes the computer to perform the method of the first aspect or any one of the possible executions of the first aspect. These computer-readable stores 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 disk drive (hard drive).
In a seventh aspect, there is provided a computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the above-described first aspect or any one of the possible methods of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the technical scheme, under the condition that the grating period is not required to be changed, the lattice type light field with dense lattice distribution can be obtained, the processing precision requirement on the grating is reduced, the implementation is easy, and 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 and the like;
2. In the technical scheme of the embodiment of the application, the diffuse light wave is generated by combining the light source and the lens, so that the angular spectrum of the diffuse light wave can be adjusted, and the lattice light with more densely distributed lattice is conveniently generated;
3. in the technical scheme of the embodiment of the application, the number of the light spots of the dot matrix light field is determined through an image processing algorithm, so that the efficiency of determining the dot matrix density degree is improved, and the dot matrix light field with more densely distributed dot matrix is conveniently generated.
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 flow chart of a method for generating an encrypted lattice 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 provided by embodiments of the present application.
Fig. 5 is a schematic diagram of an exemplary system for generating an encrypted lattice light field provided by embodiments 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 device 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 not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on 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 in terms of optical simulation systems, but should not be construed as limiting the embodiments of the present application in any way, and the embodiments of the present application are equally applicable to other systems employing optical imaging techniques, etc.
Example 1
As shown in fig. 1, a system 100 is used to generate a light field, which includes a light source 101, a grating 102, and an observation plane 103, where the light field can be generated on the observation plane 103 after the light source 101 passes through the grating 102, for example, a lattice light field 104.
It should be understood that the types of gratings are various, and the gratings may be classified into amplitude type gratings, phase-only type gratings, complex amplitude type gratings, binary type gratings, multi-step type gratings, continuous distribution type gratings, etc., according to the difference of the transmittance functions of the gratings.
It should also be understood that the light wave may generate a light field through the grating, and the light wave may be generated directly through the light source, or may also be generated through a combination of the light source and the lens, which is not limited in the embodiments of the present application.
Fig. 2 shows a flowchart of a method for generating an encrypted lattice light field according to an embodiment of the present application, and specifically, the method 200 includes: s201, generating a diffusion light wave.
Specifically, in the embodiment of the present application, there may be various methods for generating the diffuse light wave, alternatively, the diffuse light wave may be generated by a light source, and the diffuse light wave may be generated by passing the light source through a lens.
In a possible implementation manner, the wavelength of the diffuse 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 diffuse light wave may be in an infrared band. Alternatively, the wavelength of the diffuse light wave is 532nm. The present application is not limited in this regard.
It should be understood that the above-described lenses may include any one of a concave lens, a convex lens, and a lens group, which is not limited in this application. It is also understood that the lens group representation is made up of a combination of at least one lens.
It is also understood that when a diffuse light wave is generated by a light source through a lens, the lens is a lens capable of varying the angular spectral composition of the laser light source such that the light source passes through the lens to become a diffuse light wave. For example, passing a laser light source through a concave lens causes the angular spectral content of the light wave passing through the grating to increase, i.e., generates a diffuse light wave.
S202, a first lattice light field is generated on a first observation plane by passing a diffused light wave through a first grating, wherein the number of first light points of the first lattice light field in a unit area is a first numerical value.
Specifically, in the embodiment of the application, the diffuse light wave is irradiated on the first grating, so that the diffuse light wave passes through the first grating, and thus the first lattice light field can be generated on the first observation plane. And determining the number of first light spots in the first lattice light field per unit area as a first value.
It should be understood that the size of the unit area may be any value, for example, 10mm×10mm, and may be 100mm×100mm. The present application is not limited in this regard. It will also be appreciated that the first light spot is a light spot of a first lattice light field having a greater light field intensity, e.g. the light field intensity of the first light spot is the maximum of the light field intensity in the first lattice light field, and e.g. the light field intensity of the first light spot is greater than 80% of the maximum of the light field intensity in the first lattice light field. The present application is not limited in this regard.
In a possible implementation, the distance between the diffusion center 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 viewing plane and the first grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
Alternatively, the method for determining the number of first light points of the first lattice light field may be any one of the following:
1) And determining the number of the first light spots of the first lattice light field as a first numerical value according to a Fresnel integral formula. It should be understood that this method can be understood as an algorithm that calculates the number of first light spots of the first lattice light field as a first value from the fresnel integration formula.
2) According to an image processing algorithm, the number of first light points of the first lattice light field is determined to be a first numerical value. It should be understood that the method specifically may be that information such as peak intensity, width, position and the like in the distribution of the lattice light field is extracted through an image processing algorithm, and it is determined that the number of first light points of the first lattice light field is a 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.
In particular, in the embodiments of the present application, the optimization algorithm may be an exhaustive approach. By changing the grating transmittance function of the first grating, namely, under the condition of ensuring that the grating period is unchanged, the grating transmittance function is exhausted, after the second grating is obtained, the diffused light waves pass through the second grating, and then the obtained lattice light field with more dense lattice distribution is obtained, namely, the following step S204.
In a possible implementation, the grating period of the first grating and the grating period of the second grating are each 10-1000 times the wavelength of the diffused light wave, e.g. the grating period is 16 μm.
Alternatively, the change in the grating transmissivity function may be obtained by changing the grating duty cycle.
In another possible implementation manner, the first grating and the second grating are two-dimensional gratings, and the duty ratios of the gratings in two dimension 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 cycles in the first and second dimension directions of the second grating may be the same or different.
Alternatively, for the value of the grating duty ratio in any dimension direction of the two-dimensional grating, it may be: the first grating has a grating duty cycle of 0.3-0.5, for example 0.37; the second grating has a grating duty cycle of 0.5-0.55, e.g. 0.51, and/or the second grating has a grating duty cycle of 0.06-0.1, e.g. 0.08. The present application is not limited in this regard.
S204, the diffused light waves pass through the second grating, and a second lattice light field is generated on the first observation plane, wherein the number of second light points of the second lattice light field in a unit area is a second numerical value, and the first numerical value is smaller than the second numerical value.
Specifically, in the embodiment of the present application, when the second lattice light field is generated, a point different from that of the first lattice light field is that the grating transmittance function is different, and the first grating is replaced by the second grating, and the position of the second grating relative to the diffused light wave is the same as the position of the first grating relative to the diffused light wave. Under the condition of ensuring that other conditions are unchanged, the transmittance of the grating is changed, and a lattice type light field with denser lattice distribution, namely a second lattice type light field, is generated.
It should be appreciated that the second light spot is a light spot in the second lattice light field having a larger light field intensity, e.g., the light field intensity of the second light spot is the maximum value of the light field intensity in the second lattice light field, and further, e.g., the light field intensity of the second light spot is greater than 80%, or 85%, or 90% of the maximum value of the light field intensity in the second lattice light field. The present application is not limited in this regard.
In a possible implementation, the distance between the diffusion center 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 viewing plane and the second grating is greater than or equal to 1000 times the wavelength, for example 0.5m.
Alternatively, the method for determining the number of the second light spots of the second lattice light field may be any one of the following:
1) And determining the number of the second light spots of the second lattice light field as a second numerical value according to the Fresnel integral formula. It should be understood that this method can be understood as a calculation method, which calculates the number of second light spots of the second lattice light field to be the 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 the method specifically may be that information such as peak intensity, width, position and the like in the distribution of the lattice light field is extracted through an image processing algorithm, and it is determined that the number of second light points of the second lattice light field is a second numerical value.
It should be appreciated that the image processing algorithm may be an image feature extraction method.
Therefore, by the method, a denser lattice light field can be generated under the condition of not changing the grating period, the processing precision requirement on the grating is lower, and the light field is pure, so that the performance under various use scenes, such as the spatial resolution in the detection process, can be 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:
wherein E represents the complex amplitude of the light field, z represents the coordinate value in the direction perpendicular to the grating surface, x represents the coordinate value in the direction perpendicular to z, i.e. the coordinate value in the direction in which the light field periodically varies, a represents the amplitude of the diffused light wave, j represents the imaginary unit, represents the wave number, r represents the distance between the diffusion center of the wavefront phase of the diffused light wave and the grating center, x0 represents the coordinate value in the direction of the periodic arrangement of the grating surface, and t (x 0) represents the transmittance function of the grating.
Fig. 3 shows a schematic structural diagram of a system for generating a lattice 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 to become a diffuse light wave.
Alternatively, the lens may be a concave lens, a convex lens, or a lens group, which is not limited in this application.
It should be noted that, in the functions that can be implemented by the system shown in fig. 3, the specific implementation manner of some functions is the same as the method in fig. 2, and will not be repeated here.
In the above system, the light source 301 is used to generate diffuse light waves. Alternatively, the light source may generate diffuse light waves through the rear of the lens. For a specific way of generating the diffused light wave, reference is made to the above detailed description in step S201 of the method 200, and the detailed description is omitted here.
In the above system, the grating 303 includes a first grating and a second grating, 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 first grating is used for generating a first lattice light field on a first observation plane through diffusing light waves, wherein the number of first light points of the first lattice light field in a unit area is a first numerical value;
the second grating is used for generating a second lattice light field on the first observation plane through diffusing light waves, wherein the number of second light points of the second lattice light field in a unit area is a second numerical value, and the first numerical value is smaller than the second numerical value.
For the determination manners 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-S204 in the method 200, which are not repeated here.
In the following, with reference to fig. 4 to 8, in a method and a system for generating a lattice light field according to embodiments of the present application, when a light source generates a diffuse light wave through a lens, relevant contents of the generating lattice light field are described in detail.
It should be noted that, in the following descriptions of fig. 4 to 8, the first grating and the second grating are all phase-pure two-dimensional gratings with a phase distribution of 0 and pi structure, and the duty ratios of the gratings in different dimension directions of the first grating are the same, and the duty ratios of the gratings in different dimension directions of the second grating are the same. Fig. 4 and 5 correspond to a method and system, respectively, in which a light source generates a diffuse light wave through a convex lens and a concave lens.
Fig. 4 shows 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. The functional description of the various components of the system may be referred to above in connection with the description of fig. 3 and will not be repeated here.
Fig. 5 shows 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. 5, the system 500 includes a light source 501, a concave lens 502, a grating 503, and a viewing plane 504. The functional description of the various components of the system may be referred to above in connection with the description of fig. 3 and will not be repeated here.
In a possible implementation manner, the wavelength of the diffused light wave may be 532nm, the grating period is 16 μm, and r is 0.813mm, where when z=0.3 m, the light field period of the generated lattice light field is 5.9mm; when z=0.4m, the light field period of the generated lattice light field is 7.9mm; when z=0.5 m, the light field period of the generated lattice light field is 9.9mm.
It should be appreciated that in the above possible implementation, by varying the duty cycle of the grating, a lattice light field of different lattice distribution densities can be obtained. In particular, see the following description of FIGS. 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 fig. 6 (a) and (b), when the grating duty ratios in both the two dimension directions of the grating are 0.37 and z=0.5m, the generated light field one-dimensional image and light field two-dimensional image are shown, respectively.
Fig. 7 illustrates a light field image generated by a method or system provided by an embodiment of the present application. As shown in fig. 7 (a) and (b), when the grating duty ratios in both the two dimension directions of the grating are 0.51 and z=0.5 m, respectively, the generated light field one-dimensional image and light field two-dimensional image are shown.
Fig. 8 illustrates a light field image generated by a method or system provided by an embodiment of the present application. As shown in fig. 8 (a) and (b), when the grating duty ratios in both the two dimension directions of the grating are 0.08 and z=0.5m, respectively, the generated light field one-dimensional image and light field two-dimensional image are shown.
It should be understood that the corresponding grating of fig. 6 may be understood as a first grating and the corresponding gratings of fig. 7, 8 may be understood as a second grating. Namely, based on the grating parameters shown in fig. 6, by changing the grating transmittance function, a lattice type light field with more densely distributed lattice, i.e. the lattice type light field shown in fig. 7-8, can be obtained.
Thus, as can be seen from the above figures 6-8, changing the grating duty cycle can generate a more densely distributed lattice light field while ensuring that other conditions are unchanged.
An apparatus for generating a lattice type light field and a computer device provided in an embodiment of the present application are described below with reference to fig. 9 and 10.
Example 2
Fig. 9 shows a schematic diagram of a simulation apparatus for generating a lattice 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 diffusion light waves; the second processing module is used for generating a first lattice type light field on a first observation plane by passing the diffused light wave through the first grating, wherein the number of first light spots of the first lattice type 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; the fourth processing module is used for generating a second lattice light field on the first observation plane by passing the diffused light waves through the second grating, wherein the number of second light points of the second lattice light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value.
For the specific functions of the first to fourth processing modules, reference may be made to the detailed description of the method embodiments described above, and the detailed description thereof will not be repeated here.
Example 3
Fig. 10 shows a schematic structural diagram of a computer device according to an embodiment of the present application. As depicted in fig. 10, the computer device 1000 comprises a memory 1001 and a processor 1002, the memory 1001 comprising a computer program executable on the processor; the processor executes the computer program so that the relevant content of the above-described method embodiments can be implemented. And will not be described in detail herein.
Example 4
The present application also provides a computer readable medium storing a program code which, when run on a computer, causes the computer to perform the method of the above-described method embodiments. These computer-readable stores 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 disk drive (hard drive).
Example 5
The embodiment of the application also provides a chip system, which comprises: the 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 a circuit, 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 particular implementations, the system-on-chip may be implemented in the form of a central processing unit (central processing unit, CPU), microcontroller (micro controller unit, MCU), microprocessor (micro processing unit, MPU), digital signal processor (digital signal processing, DSP), system-on-chip (SoC), application-specific integrated circuit (ASIC), field programmable gate array (field programmable gate array, FPGA), or programmable logic device (programmable logic device, PLD).
Example 6
Embodiments of the present application also provide a computer program product comprising a series of instructions which, when executed, perform the operations of the methods of the above aspects.
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 may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between 2 or more computers. Furthermore, 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 in 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 solution. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in 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 solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A method for generating an encrypted lattice type light field comprises the following steps: generating a diffused light wave; generating a first lattice light field on a first observation plane by passing the diffused light wave through a first grating, wherein the number of first light points of the first lattice 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; generating a second lattice light field on the first observation plane by passing the diffused light wave through the second grating, wherein the number of second light spots of the second lattice light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value;
the generating a diffused light wave includes: the light source is used for generating 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 angular spectrum of the diffused light wave can be adjusted, and a lattice light field with more densely distributed lattice is generated conveniently;
The number of first light spots of the first lattice light field is a first numerical value, and the method comprises the following steps: determining the number of first light spots of the first lattice light field as the first numerical value according to a Fresnel integral formula; or, according to an image processing algorithm, determining the number of first light points of the first lattice light field as the first numerical value; the number of the second light spots of the second lattice light field is a second numerical value, which comprises: determining the number of second light spots of the second lattice light field as the second numerical value according to a Fresnel integral formula; or determining the number of second light spots of the second lattice light field as the second numerical value according to an image processing algorithm.
2. The method of claim 1, wherein providing a system for generating a lattice light field comprises: the device comprises a light source, a first grating and a second grating, wherein the grating period of the first grating is the same as that of the second grating, and the grating transmittance function of the first grating is different from that of the second grating, specifically: the light source is used for generating diffusion light waves; the first grating is used for generating a first lattice type light field on a first observation plane through the diffused light waves, wherein the number of first light spots of the first lattice type light field in a unit area is a first numerical value; the second grating is used for generating a second lattice light field on the first observation plane through the diffused light waves, wherein the number of second light spots of the second lattice light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value;
The system also includes a lens, the light source for generating a diffuse light wave, the light source for generating the diffuse light wave through the lens.
3. The method of generating an encrypted lattice light field according to claim 1, wherein providing a simulation apparatus for generating a lattice light field comprises: the first processing module is used for generating diffusion light waves; the second processing module is used for generating a first lattice light field on a first observation plane through the first grating, wherein the number of first light spots of the first lattice 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; a fourth processing module, configured to generate a second lattice light field on the first observation plane by passing the diffused light wave through the second grating, where the number of second light points of the second lattice light field in the unit area is a second numerical value, and the first numerical value is smaller than the second numerical value;
The first processing module is used for generating diffusion light waves, and the first processing module is specifically used for: passing a light source through a lens to generate the diffused light wave;
the number of the first light spots of the first lattice light field is a first numerical value, and the second processing module is specifically configured to: determining the number of first light spots of the first lattice light field as the first numerical value according to a Fresnel integral formula; or, according to an image processing algorithm, determining the number of first light points of the first lattice light field as the first numerical value;
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 lattice light field as the second numerical value according to a Fresnel integral formula; or determining the number of second light spots of the second lattice light field as the second numerical value according to an image processing algorithm.
4. A method of generating an encrypted lattice light field according to claim 1, 2 or 3, wherein the optimization algorithm is an exhaustive method, the lens is any one of a concave lens, a convex lens and a lens group, the grating transmittance function is obtained by changing a grating duty cycle, and the wavelength of the diffused light wave is determined according to an application scenario of the method;
The wavelength of the scattered light wave is 532nm, the grating period of the first grating and the grating period of the second grating are 10-1000 times of the wavelength of the scattered light wave, the grating duty ratio of the first grating in any one dimension direction is 0.3-0.5, the grating duty ratio of the second grating in any one dimension direction is 0.5-0.55 or 0.06-0.1, the distance between the diffusion center of the wavefront phase of the scattered light wave and the first grating or the second grating is more than or equal to 0.5mm, and the distance between the first observation plane and the first grating or the second grating is more than or equal to 1000 times of the wavelength.
5. A method of generating an encrypted lattice light field according to claim 1, characterized in that a computer device is provided 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 generating an encrypted lattice light field described above.
6. The method of claim 1, wherein a chip is provided, the chip comprises a processor and a communication interface, the communication interface is used for receiving data and transmitting the received data to the processor, and the processor processes the data according to the method of generating the encrypted lattice light field.
7. A method of generating an encrypted lattice light field according to claim 1, characterized in that a computer readable medium is provided, which computer readable medium stores a program code which, when run on a computer, causes the computer to perform the above method of generating an encrypted lattice light field.
8. A method of generating an encrypted lattice light field according to claim 1, characterized in that 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 above-described method of generating an encrypted lattice light field.
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