CN110244469B - Method and system for determining position and diffusion angle of directional diffuser - Google Patents

Method and system for determining position and diffusion angle of directional diffuser Download PDF

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Publication number
CN110244469B
CN110244469B CN201910530503.2A CN201910530503A CN110244469B CN 110244469 B CN110244469 B CN 110244469B CN 201910530503 A CN201910530503 A CN 201910530503A CN 110244469 B CN110244469 B CN 110244469B
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lens array
directional diffuser
determining
distance
display
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CN110244469A (en
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闫兴鹏
文军
蒋晓瑜
严志强
汪熙
王子强
毕建权
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Army Academy of Armored Forces
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Army Academy of Armored Forces
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938Using specific optical elements
    • G02B27/095Refractive optical elements
    • G02B27/0955Lenses
    • G02B27/0961Lens arrays

Abstract

The invention provides a method and a system for determining the position and the diffusion angle of a directional diffuser, wherein the method for determining the position and the diffusion angle of the directional diffuser comprises the following steps: acquiring parameters of a lens array of a light field display system based on integrated imaging and the distance between a display and the lens array; determining the position of the directional diffuser by determining the parallax of like image points in different unit images based on the parameters of the lens array and the distance of the display from the lens array; determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and a parameter of the lens array. The invention realizes the quantitative determination of the diffusion angle of the directional diffuser, the decoupling of the position of the directional diffuser and the depth central plane, and the dynamic determination of the position of the directional diffuser based on the space position of the display object, thereby realizing the clear display of the scene with large depth range.

Description

Method and system for determining position and diffusion angle of directional diffuser
Technical Field
The invention relates to the technical field of integrated imaging, in particular to a method and a system for determining the position and the diffusion angle of a directional diffuser.
Background
The traditional integrated imaging technology uses the densely arranged micro-lens array to regulate and control light, the displayed field angle is very limited, and the watching experience of people is influenced. The light field display based on integrated imaging adopts a lens array formed by relatively large-sized lenses (usually larger than or equal to 2mm) to regulate and control light rays, recover a discrete light field with sparse space, and secondarily regulate and control the discrete light field by utilizing the angular spectrum diffusion characteristic of a directional diffuser to recover a continuous light field. And better three-dimensional display experience can be brought. The selection of the diffusion angle of the directional diffuser and the determination of the placement position of the directional diffuser based on the integrated imaging light field display system are very important, and if the determination is improper, the image blur is caused, and the viewing experience is influenced.
Disclosure of Invention
The invention aims to provide a method and a system for determining the position and the diffusion angle of an orientation diffuser, so as to determine the position and the diffusion angle of the orientation diffuser, realize the clear display of a scene with a large depth range and improve the visual experience of a light field display system based on integrated imaging.
In order to achieve the purpose, the invention provides the following scheme:
a method of determining the position and spread angle of a directional diffuser, said method comprising the steps of:
acquiring parameters of a lens array of a light field display system based on integrated imaging and the distance between a display and the lens array;
determining the position of the directional diffuser by determining the parallax of like image points in different unit images based on the parameters of the lens array and the distance of the display from the lens array;
determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and a parameter of the lens array.
Optionally, the parameters of the lens array include a distance p between two adjacent lenses of the lens array, and a diameter a of a lens of the lens array.
Optionally, the determining, according to the parameter of the lens array and the distance between the display and the lens array, the position of the directional diffuser by determining the parallax of the same-name image points in different unit images specifically includes:
according to the parameters of the lens array and the distance g between the display and the lens array, using a formulaCalculating the distance d between the directional diffuser and the lens array to obtain the position of the directional diffuser;
where l denotes an interval of the same-name point between two unit images.
Optionally, the determining a diffusion angle of the directional diffuser according to the position of the directional diffuser and the parameter of the lens array and according to the light scattering principle specifically includes:
using a formula based on the distance d between the directional diffuser and the lens array and the diameter a of the lenses of the lens arrayCalculating the angular spectral width theta of the incident rayin
Using a formula based on the distance d between the directional diffuser and the lens array and the distance p between two adjacent lenses of the lens arrayCalculating the angular spectral width theta of the emergent rayout
According to the angular spectrum width theta of the incident lightinAnd the angular spectrum width theta of the emergent rayoutSolving the equationObtaining the diffusion angle theta of a directional diffuserd
A system for determining the position and divergence angle of a directional diffuser, the system comprising:
the parameter acquisition module is used for acquiring parameters of a lens array of the light field display system based on integrated imaging and the distance between the display and the lens array;
a position determining module of the directional diffuser for determining a position of the directional diffuser by determining a disparity of like image points in different unit images based on parameters of the lens array and a distance of the display from the lens array;
a diffusion angle determining module of the directional diffuser for determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and a parameter of the lens array.
Optionally, the parameters of the lens array include a distance p between two adjacent lenses of the lens array, and a diameter a of a lens of the lens array.
Optionally, the position determining module of the directional diffuser specifically includes:
a position determination submodule of the directional diffuser for determining the position of the display based on the parameters of the lens array and the distance g between the display and the lens arrayCalculating the distance d between the directional diffuser and the lens array to obtain the position of the directional diffuser;
where l denotes an interval of the same-name point between two unit images.
Optionally, the diffusion angle determining module of the directional diffuser specifically includes:
an angular spectral width of incident light operator module for calculating the angular spectral width of incident light using a formula based on the distance d between the directional diffuser and the lens array and the diameter a of the lenses of the lens arrayCalculating the angular spectral width theta of the incident rayin
An angular spectral width calculator module for calculating the angular spectral width of the outgoing light rays, based on the distance d between the directional diffuser and the lens array and the distance p between two adjacent lenses of the lens array, using a formulaCalculating the angular spectral width theta of the emergent rayout
A diffusion angle calculation submodule of the directional diffuser for calculating a diffusion angle of the directional diffuser based on the angular spectral width θ of the incident light rayinAnd the angular spectrum width theta of the emergent rayoutSolving the equationObtaining the diffusion angle theta of a directional diffuserd
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for determining the position and the diffusion angle of a directional diffuser, wherein the method for determining the position and the diffusion angle of the directional diffuser comprises the following steps: acquiring parameters of a lens array of a light field display system based on integrated imaging and the distance between a display and the lens array; determining the position of the directional diffuser by determining the parallax of like image points in different unit images based on the parameters of the lens array and the distance of the display from the lens array; determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and a parameter of the lens array. The invention realizes the quantitative determination of the diffusion angle of the directional diffuser, the decoupling of the position of the directional diffuser and the depth central plane, and the dynamic determination of the position of the directional diffuser based on the space position of the display object, thereby realizing the clear display of the scene with large depth range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings provided by the present invention without any creative effort.
Fig. 1 is a flow chart of a method for determining the position and divergence angle of a directional diffuser according to the present invention;
fig. 2 is a schematic diagram of the imaging effect of the directional diffuser provided by the present invention at different positions; wherein, the diagram (a) is that the directional scatterer is in the 3D image O1Image effect schematic of position, plot (b) directional diffuser in 3D image O1And the imaging effect of the position between the lens array, and the figure (c) shows that the directional diffuser is in the 3D image O1The imaging effect of the position between the observer and the imaging device is shown schematically;
fig. 3 is a schematic diagram of the present invention providing for determining the position of a directional diffuser;
fig. 4 is a schematic diagram of the present invention for determining the diffusion angle of a directional diffuser based on the principle of light scattering;
fig. 5 is a block diagram of a system for determining the position and divergence angle of a directional diffuser according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for determining the position and the diffusion angle of an orientation diffuser, so as to determine the position and the diffusion angle of the orientation diffuser, realize the clear display of a scene with a large depth range and improve the visual experience of a light field display system based on integrated imaging.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a method of determining the position and divergence angle of a directional diffuser, comprising the steps of:
step 101, acquiring parameters of a lens array of the light field display system based on integrated imaging and a distance between a display and the lens array.
The parameters of the lens array include a distance p between two adjacent lenses of the lens array, and a diameter a of the lens array.
The integrated imaging-based light field display system includes a flat panel display, a lens array, and a directional diffuser. The planar display is loaded with a unit image array generated according to a three-dimensional scene to be displayed. The light emitted by the display loaded with the unit image array is modulated for the first time through the lens array to recover a discrete light field, and the continuous light field is recovered through the secondary modulation of the directional diffuser. An image of the three-dimensional scene is ultimately generated.
Step 102, determining the position of the directional diffuser by determining the parallax of the same-name image points in different unit images according to the parameters of the lens array and the distance between the display and the lens array;
in the light field display system based on integrated imaging, the lenses in the lens array are generally large in size (larger than or equal to 2mm), and the situations of sparse arrangement or diaphragm existence exist generally, namely p is larger than or equal to a.
According to the characteristics of lens imaging, a Central Depth Plane (CDP) exists in the system, and the position of the CDP can be obtained according to the Gaussian theorem:wherein d is1Representing the distance of the depth center plane from the lens array.
Current research shows that directional diffusers should be placed in the depth center plane, and research has not found that there is a necessary coupling relationship between the positions of the directional diffusers and the depth center plane. Instead, the position of the directional diffuser should be in the proper position for the object to be displayed.
As shown in fig. 2, this can only be achieved when the directional diffuser is located at the three-dimensional pixel locationThe image is now clearly imaged. When the directional diffuser is positioned right in the 3D image O1The light is accurately diffused without gaps and overlapping, as shown in fig. 3 (a). When the directional diffuser is positioned in the 3D image O1There is a large overlap of the diffused light rays with the lens array. As shown in fig. 3 (b). When the directional diffuser is positioned in the 3D image O1When the light is observed from the observer, a large gap exists between the diffused light and the observer. In summary, should be located right in the 3D image O1The location of the same. Since an actual 3D scene has a certain depth range, in actual operation, the directional diffuser should be located at the center of the depth range where the 3D scene is located.
And the position of the 3D image point can be determined by the disparity of the image points of the same name in the different unit images. As shown in the figure 3 of the drawings,and l ═ y1) + y2, where p is the distance between two adjacent lenses of the lens array and l is the separation of the homonymous point between the two elemental images.
The position of the image point, i.e. the position of the directional diffuser, is:
step 103, determining the diffusion angle of the directional diffuser according to the light scattering principle according to the position of the directional diffuser and the parameters of the lens array.
As shown in fig. 4, the step 103 of determining the diffusion angle of the directional diffuser according to the position of the directional diffuser and the parameters of the lens array and the light scattering principle includes: using a formula based on the distance d between the directional diffuser and the lens array and the diameter a of the lenses of the lens arrayCalculating the angular spectral width theta of the incident rayin(ii) a Depending on the distance d between the directional diffuser and the lens array and the distance p between two adjacent lenses of the lens arrayBy the formulaCalculating the angular spectral width theta of the emergent rayout(ii) a According to the angular spectrum width theta of the incident lightinAnd the angular spectrum width theta of the emergent rayoutSolving the equationObtaining the diffusion angle theta of a directional diffuserd
The present invention also provides, as shown in fig. 5, a system for determining the position and divergence angle of a directional diffuser, the system comprising:
and the parameter acquiring module 501 is used for acquiring parameters of a lens array of the light field display system based on integrated imaging and the distance between the display and the lens array.
The parameters of the lens array include a distance p between two adjacent lenses of the lens array, and a diameter a of the lens array.
A position determining module 502 of the directional diffuser, configured to determine the position of the directional diffuser by determining the parallax of the same-name image points in different unit images according to the parameters of the lens array and the distance between the display and the lens array.
The position determining module 502 of the directional diffuser specifically comprises: a position determination submodule of the directional diffuser for determining the position of the display based on the parameters of the lens array and the distance g between the display and the lens arrayCalculating the distance d between the directional diffuser and the lens array to obtain the position of the directional diffuser; where l denotes an interval of the same-name point between two unit images.
A diffusion angle determining module 503 of the directional diffuser, configured to determine the diffusion angle of the directional diffuser according to the light scattering principle according to the position of the directional diffuser and the parameters of the lens array.
Expansion of the directional diffuserThe divergence angle determining module 503 specifically includes: an angular spectral width of incident light operator module for calculating the angular spectral width of incident light using a formula based on the distance d between the directional diffuser and the lens array and the diameter a of the lenses of the lens arrayCalculating the angular spectral width theta of the incident rayin(ii) a An angular spectral width calculator module for calculating the angular spectral width of the outgoing light rays, based on the distance d between the directional diffuser and the lens array and the distance p between two adjacent lenses of the lens array, using a formulaCalculating the angular spectral width theta of the emergent rayout(ii) a A diffusion angle calculation submodule of the directional diffuser for calculating a diffusion angle of the directional diffuser based on the angular spectral width θ of the incident light rayinAnd the angular spectrum width theta of the emergent rayoutSolving the equationObtaining the diffusion angle theta of a directional diffuserd
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for determining the position and the diffusion angle of a directional diffuser, wherein the method for determining the position and the diffusion angle of the directional diffuser comprises the following steps: acquiring parameters of a lens array of a light field display system based on integrated imaging and the distance between a display and the lens array; determining the position of the directional diffuser by determining the parallax of like image points in different unit images based on the parameters of the lens array and the distance of the display from the lens array; determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and a parameter of the lens array. The invention realizes the quantitative determination of the diffusion angle of the directional diffuser, the decoupling of the position of the directional diffuser and the depth central plane, and the dynamic determination of the position of the directional diffuser based on the space position of the display object, thereby realizing the clear display of the scene with large depth range.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
The principles and embodiments of the present invention have been described herein using specific examples, which are presented solely to aid in the understanding of the apparatus and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (6)

1. A method of determining the position and spread angle of a directional diffuser, said method comprising the steps of:
acquiring parameters of a lens array of a light field display system based on integrated imaging and the distance between a display and the lens array;
determining the position of the directional diffuser by determining the parallax of like image points in different unit images based on the parameters of the lens array and the distance of the display from the lens array;
determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and parameters of the lens array;
the determining the position of the directional diffuser by determining the parallax of the same-name image points in different unit images according to the parameters of the lens array and the distance between the display and the lens array specifically comprises:
according to the parameters of the lens array and the distance g between the display and the lens array, using a formulaCalculating the distance between a directional diffuser and a lens arrayd, obtaining the position of the directional diffuser;
where l denotes an interval between two unit images of the same-name image point, and p denotes a distance between adjacent two lenses of the lens array.
2. A method of determining the position and spread angle of a directional diffuser according to claim 1, wherein the parameters of the lens array include the distance p between two adjacent lenses of the lens array, the diameter a of the lenses of the lens array.
3. A method of determining the position and spread angle of a directional diffuser according to claim 2, wherein said determining the spread angle of a directional diffuser according to the principle of light scattering based on the position of said directional diffuser and the parameters of said lens array comprises:
using a formula based on the distance d between the directional diffuser and the lens array and the diameter a of the lenses of the lens arrayCalculating the angular spectral width theta of the incident rayin
Using a formula based on the distance d between the directional diffuser and the lens array and the distance p between two adjacent lenses of the lens arrayCalculating the angular spectral width theta of the emergent rayout
According to the angular spectrum width theta of the incident lightinAnd the angular spectrum width theta of the emergent rayoutSolving the equationObtaining the diffusion angle theta of a directional diffuserd
4. A system for determining the position and spread angle of a directional diffuser, said system comprising:
the parameter acquisition module is used for acquiring parameters of a lens array of the light field display system based on integrated imaging and the distance between the display and the lens array;
a position determining module of the directional diffuser for determining a position of the directional diffuser by determining a disparity of like image points in different unit images based on parameters of the lens array and a distance of the display from the lens array;
a diffusion angle determining module of the directional diffuser for determining a diffusion angle of the directional diffuser according to a light scattering principle based on a position of the directional diffuser and a parameter of the lens array;
the position determining module of the directional diffuser specifically comprises:
a position determination submodule of the directional diffuser for determining the position of the display based on the parameters of the lens array and the distance g between the display and the lens arrayCalculating the distance d between the directional diffuser and the lens array to obtain the position of the directional diffuser;
where l denotes an interval between two unit images of the same-name image point, and p denotes a distance between adjacent two lenses of the lens array.
5. A directional diffuser position and spread angle determination system according to claim 4, wherein the parameters of the lens array include the distance p between two adjacent lenses of the lens array, the diameter a of a lens of the lens array.
6. A system for determining the position and spread angle of a directional diffuser according to claim 5, wherein said spread angle determining module of a directional diffuser comprises:
an angular spectral width of the incident ray calculator module for calculating the angular spectral width of the incident ray based on the distance d between the directional diffuser and the lens array and the diameter of the lenses of the lens arraya, using a formulaCalculating the angular spectral width theta of the incident rayin
An angular spectral width calculator module for calculating the angular spectral width of the outgoing light rays, based on the distance d between the directional diffuser and the lens array and the distance p between two adjacent lenses of the lens array, using a formulaCalculating the angular spectral width theta of the emergent rayout
A diffusion angle calculation submodule of the directional diffuser for calculating a diffusion angle of the directional diffuser based on the angular spectral width θ of the incident light rayinAnd the angular spectrum width theta of the emergent rayoutSolving the equationObtaining the diffusion angle theta of a directional diffuserd
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