Hologram calculation device, hologram calculation method, and hologram image display system
The hologram arithmetic unit and method facilitate the distribution of hologram data to devices with diverse specifications by generating interference fringe data for spatial light modulators, ensuring stereoscopic viewing across different devices.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- HOKKAIDO UNIVERSITY
- Filing Date
- 2024-10-29
- Publication Date
- 2026-05-15
AI Technical Summary
Existing hologram video display systems struggle with distributing hologram data efficiently across devices with varying specifications.
A hologram arithmetic unit and method that includes a data acquisition unit and an optical arithmetic unit to generate interference fringe data for a spatial light modulator, facilitating the distribution of hologram data to devices with diverse specifications by performing inverse operations on object light data.
Enables efficient distribution of hologram data to hologram video display devices with various specifications, allowing for stereoscopic viewing regardless of device specifications.
Smart Images
Figure 2026078987000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a hologram arithmetic unit, a hologram arithmetic method, and a hologram video display system.
Background Art
[0002] Techniques that enable the observation of hologram videos by multiple observers are known (see Non-Patent Document 1). In this technique, by distributing hologram data to a plurality of hologram video display devices, it becomes possible to observe hologram videos on each hologram video display device.
Prior Art Documents
Non-Patent Documents
[0003]
Non-Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, in the case where hologram video display devices with different specifications coexist as described above, it is necessary to prepare hologram data for the number of specifications.
[0005] One aspect of the present invention aims to realize a hologram arithmetic unit, a hologram arithmetic method, and a hologram video display system that facilitate the distribution of hologram data to hologram video display devices with various specifications.
Means for Solving the Problems
[0006] In order to solve the above problems, a hologram arithmetic unit according to an aspect of the present invention is a hologram arithmetic unit for a hologram video display device that displays a hologram video. The hologram video display device includes a spatial light modulator that displays interference fringes corresponding to the hologram video, an optical system for converting the interference fringes into object light for an observer to observe, and an observation site where the observer observes the object light. The hologram arithmetic unit includes a data acquisition unit that acquires object light data corresponding to the hologram video, and an optical arithmetic unit that performs an inverse operation corresponding to an inverse conversion of the conversion by the optical system on the object light data to generate interference fringe data for the spatial light modulator.
[0007] In order to solve the above problems, a hologram arithmetic method according to an aspect of the present invention is a hologram arithmetic method for a hologram video display device that displays a hologram video. The hologram video display device includes a spatial light modulator that displays interference fringes corresponding to the hologram video, an optical system for converting the interference fringes into object light for an observer to observe, and an observation site where the observer observes the object light. The hologram arithmetic method includes a data acquisition process that acquires object light data corresponding to the hologram video, and an optical arithmetic process that performs an inverse operation corresponding to an inverse conversion of the conversion by the optical system on the object light data to generate interference fringe data for the spatial light modulator.
Advantages of the Invention
[0008] According to one aspect of the present invention, it is possible to facilitate the distribution of hologram data to hologram video display devices of various specifications.
Brief Description of the Drawings
[0009] [Figure 1] It is a block diagram showing a hologram video display system according to an embodiment of the present invention. [Figure 2] It is a schematic diagram showing an example of an optical system. [Figure 3] This is a schematic diagram illustrating an example of an optical element. [Figure 4] This is a schematic diagram illustrating an example of an optical system. [Figure 5] This is a schematic diagram illustrating an example of an optical system. [Figure 6] This is a schematic diagram illustrating an example of an optical system. [Figure 7] This is a schematic diagram illustrating an example of an optical system. [Figure 8] This is a schematic diagram illustrating an example of an optical system. [Figure 9] This is a schematic diagram illustrating an example of an optical system. [Figure 10] This is a schematic diagram illustrating an example of an optical system. [Figure 11] This is a diagram representing the image of hologram data. [Figure 12] This is a diagram representing the image of hologram data. [Modes for carrying out the invention]
[0010] [Embodiment] An embodiment of the present invention will be described in detail below. Figure 1 is a block diagram representing a hologram image display system 1 according to the embodiment.
[0011] The hologram image display system 1 is a system that enables observation of hologram images by multiple observers P, and includes an object light data transmission device 10, a network NW, a hologram calculation device 20, and a hologram image display device 30.
[0012] The object light data transmission device 10 transmits object light data. Object light data is data representing object light (light coming from an object). Object light is the wavefront of light that should be observed at the observation site E (the position of the pupil E of observer P). Object light is light that reflects the spatial arrangement of the object, enabling stereoscopic vision of the object by observer P. As an example of object light, object light u directly in front of observer P's pupil E e The following can be listed. Below, object light u e The data of object light data u eIt may be referred to as such, and the observation site E may be referred to as the position immediately in front of the pupil E of the observer P.
[0013] The object light data transmitted from the object light data transmission device 10 (as an example, object light data u e ) can be obtained, for example, by converting (forward conversion, forward operation) the object light u at the observation site E from an image (3D data of an object). Details of this will be described later. e This will be described later.
[0014] The hologram calculation device 20 converts the object light data u e into data for display on the spatial light modulator (SLM) 31 corresponding to the hologram video display device 30 (hereinafter also referred to as SLM data), and has a data acquisition unit 21 and an optical calculation unit 22. The data acquisition unit 21 acquires the object light data u e corresponding to the hologram video from the object light data transmission device 10 via the network NW. The optical calculation unit 22 converts the object light data into SLM data corresponding to the specifications of the hologram video display device 30. The optical calculation unit 22 performs an inverse operation corresponding to the inverse of the conversion by the optical system 32 of the hologram video display device 30 on the object light data u e to generate interference fringe data (SLM data) for the spatial light modulator 31. Details of this will be described later.
[0015] The hologram video display device 30 receives the SLM data from the hologram calculation device 20, generates the object light u e corresponding to the SLM data, and supplies it to the observation site E. As a result, the observer P can stereoscopically view the video represented by the object light data u e .
[0016] The hologram image display device 30 can take various forms. It can be a head-mounted display (HMD) worn on the observer P's head. Alternatively, the hologram image display device 30 may be a holoroom that enables stereoscopic viewing using object light emitted from a large surface of the room (for example, a cylindrical surface). Further details regarding the specifications of such a hologram image display device 30 will be described later.
[0017] The hologram image display device 30 includes a spatial light modulator 31 and an optical system 32.
[0018] The spatial light modulator (SLM) 31 is a panel, such as a liquid crystal panel, that displays interference fringes (bright and dark fringes) corresponding to the hologram image based on the SLM data. The spatial light modulator 31 may be either a transmissive type that transmits light or a reflective type that reflects light.
[0019] The optical system 32 analyzes object light u from light and dark stripes based on SLM data on the spatial light modulator 31. e This generates and supplies light to the observation site E, and can be composed of, for example, lenses (convex lenses, concave lenses), mirrors (convex mirrors, concave mirrors, half mirrors), and light sources (for example, the light source 33 shown in Figure 2 below). For example, light from the light source 33 is transmitted through the spatial light modulator 31 and focused by the optical system 32 (for example, lens Lz) to produce object light u e It is supplied to the observation area E (the pupil E of observer P), enabling stereoscopic vision by observer P.
[0020] Figure 2 is a schematic diagram representing an example of an optical system. This optical system is a broad-sense optical system that also includes a spatial light modulator 31 as an element, and is basically an equivalent optical system that includes only the elements related to optical calculations. For clarity, a light source (laser light source) 33 is included in Figure 2, but the equivalent optical system does not need to directly correspond to the actual optical system, and the light source 33 can be omitted. The details of the relationship between the actual optical system and the equivalent optical system will be described later.
[0021] The equivalent optical system shown in Figure 2 includes SLM31, optical system 32 (here, lens Lz), and image Ir. Image Ir, SLM31, optical system 32, and observation area E are in coordinate systems x0, x2, x1, x e It will be placed there.
[0022] A lens Lz is a focusing / diverging element that focuses or diverges light. As shown in Figure 3, examples of transmissive focusing / diverging elements include lenses Lz (convex lens Lv, concave lens Lc), and examples of reflective focusing / diverging elements include mirrors M (convex mirror Mv, concave mirror Mc). In equivalent optical systems, it is permissible to replace the concave mirror Mc with a convex lens Lv and the convex mirror Mv with a concave lens Lc. Such substitutions make it possible to treat a reflective optical system as an equivalent optical system.
[0023] Image Ir is, for example, the image of an object perceived as a result of stereoscopic vision by observer P. Image Ir represents the object to be displayed as an image (e.g., real image, virtual image) and its position, and this object can be defined by 3D data. That is, Image Ir can be considered as 3D data of the object, including the object's position information. The object light data transmission device 10 generates object light data u from the object's 3D data. e Send.
[0024] The optical calculation unit 22 processes object light data u e By converting this to SLM data, the light that has passed through SLM31 and optical system32 is directed to the observation site E as object light u e This is how it is incident. That is, as previously described, the optical calculation unit 22 performs an inverse calculation corresponding to the inverse transformation of the transformation by the optical system 32, using the object light data u e This is executed to generate interference fringe data (SLM data) for the spatial light modulator (SLM) 31.
[0025] The details of the optical calculation will be explained below, based on Figure 2. (1) Image Ir (3D data of the object) to obtain object light u at the observation site E e Conversion to Image Ir to object light ue The conversion to is an optical calculation performed on the object light data transmission device 10, as previously described. This calculation can be expressed by the following equation (1).
[0026]
number
[0027] (2) Object light data u e Conversion (backpropagation) from to SLM data u2 or u2'. a) When there is one converging / diverging element (lens, etc.) between the observation site E and the SLM. In the optical system shown in Figure 2, one focusing / diverging element (such as a lens) is placed between the observation area E and the SLM. In this case, the object light data u e Backpropagation from to SLM data u2 can be performed by the first to third operations represented by the following equations (2), (3), and (4).
[0028]
number
[0029] Equation (2) is given by object light data u e This is an example of the first operation that converts the data u1 of the object light on the exit side of the convergence / divergence element (lens Lz).
[0030]
number
[0031] Equation (3) is an example of a second operation that converts the object light data u1 on the exit side of the convergence / divergence element (lens Lz) to the object light data u1' on the incident side of the convergence / divergence element (lens Lz).
[0032]
number
[0033] Equation (4) is an example of a third operation that converts the object light data u1' on the incident side of the convergence / divergence element (lens Lz) to object light data u2 (SLM data: wavefront data on the SLM) in the spatial light modulator 31.
[0034] b) When there is no focusing / diverging element (lens, etc.) between the observation site E and the SLM. Now, let's consider the case where there is no converging / diverging element (lens, etc.) between the observation site E and the SLM. In this case, the object light data u e The backpropagation from to the SLM data u2' is expressed by the following equation (5).
number
[0035] Equation (5) is given by object light data u e This is an example of a calculation that converts the data into object light data u2' in the spatial light modulator 31.
[0036] In this embodiment, object light data u is transmitted from the object light data transmission device 10. e Send this object light data u eBy converting the data using the hologram processing unit 20 to match the hologram image display device 30, hologram observation becomes possible regardless of the specifications of the hologram image display device 30.
[0037] As previously mentioned, object light data u e The first hologram is generated from the 3D data of the object. This generation (the operation in equation (1)) is a relatively heavy operation (large computational load) because it deals with 3D data. On the other hand, the first to third operations in equations (2) to (4) basically deal with 2D data, so they are relatively light operations (small computational load). In other words, the data transmitting side performs relatively heavy operations, and the data receiving side performs relatively light operations. By doing so, it becomes possible to make the hologram calculation device 20 on the receiving side a relatively simple device, and for example, it becomes easy to incorporate the hologram calculation device 20 into a simple hologram image display device 30.
[0038] The hologram calculation device 20 according to this embodiment is a hologram calculation device 20 for a hologram image display device 30 that displays a hologram image. The hologram image display device 30 includes a spatial light modulator 31 that displays interference fringes corresponding to the hologram image, and an object light u for observer P to observe the interference fringes. e The optical system 32 for converting to object light u e The hologram calculation device 20 has an observation area E for observing the object light data u corresponding to the hologram image. e The data acquisition unit 21 obtains the object light data u, and the optical system 32 performs an inverse operation corresponding to the reverse conversion of the conversion. e The system includes an optical calculation unit 22 that performs the calculation to generate interference fringe data (SLM data) for the spatial light modulator 31.
[0039] The object light data transmission device 10 transmits object light data u e The hologram calculation unit 20 transmits object light data u eInterference fringe data (SLM data) for the spatial light modulator 31 of the hologram image display device 30 is generated from this. Therefore, the object light data transmission device 10 does not need to transmit data tailored to the specifications of various hologram image display devices 30, and the distribution of hologram data to hologram image display devices with various specifications can be easily facilitated.
[0040] (Regarding equivalent optics) Figure 4 shows a comparison between the actual optical system S0 and an equivalent optical system S1 that is an abstraction of this optical system S0. In the actual optical system S0, the light source 33 and the lens Lz that converts the light from the light source 33 (regenerated illumination light) into parallel light L0 are omitted in the equivalent optical system S1.
[0041] In the actual optical system S0, a virtual SLM (SLMb) corresponding to the actual optical space modulator SLMa is formed by passing parallel light L0 sequentially through SLMa and the 4f optical system OU (opposing lenses Lzb and Lzc and the barrier (pinhole) BR between them). In this case, an image Irb corresponding to SLMb is formed, corresponding to the image Ira in SLMa. As a result, the equivalent optical system S1 can omit the 4f optical system OU and use an SLM and an image Ir corresponding to the virtual SLMb and image Irb in the actual optical system S0 as its elements.
[0042] In addition, in the equivalent optical system S1, flat mirrors and half-mirrors can be omitted. Furthermore, in the equivalent optical system S1, a reflective SLM (spatial light modulator) can be treated as a transmissive SLM.
[0043] (Various hologram image display devices 30) The equivalent optical system and optical calculations in various hologram image display devices 30 will be described below. Here, examples of electronic hologram devices, hologram HMD devices, and wide-field devices will be described as hologram image display devices 30.
[0044] (1) Equivalent optical system and optical calculations for electronic hologram devices Figures 5 and 6 show the actual optical system and the equivalent optical system of an electronic hologram device, respectively.
[0045] Here, light from the light source LS is converted into parallel light by the collimator CM, passed through the half mirror HM, and irradiated onto the reflective SLM. The reflected light from the reflective SLM is then reflected by the half mirror HM, passes through lens Lzb, barrier BR, and lens Lza, and is incident on the observation site E.
[0046] Here, lens Lzb, barrier BR, and lens Lza correspond to the previously described 4f optical system OU. As a result, the equivalent optical system of the electronic hologram is constructed by a virtual SLM, as shown in Figure 6, and lenses Lz, etc., are not included as elements.
[0047] Thus, the equivalent optical system of an electronic hologram device does not have converging or diverging elements that focus or diverge light.
[0048] In this case, the optical calculation unit 22 processes the object light data u e The operation B (inverse operation R{Z) converts the data u2 of the object light in the spatial light modulator 31. e1}) is executed. Note that the operation A(P{Z Oe}) is the object light u from the image Ir (object). e This refers to a forward transformation (forward operation) to [a specific value].
[0049] (2) Equivalent optical systems and optical calculations for hologram head-mounted display (HMD) devices Figures 7 and 8 show the actual optical system and the equivalent optical system of a hologram HMD device, respectively.
[0050] Here, light from the light source LS is converted into parallel light by lens Lz, reflected by half mirror HM1, and irradiated onto a reflective SLM. The reflected light from the reflective SLM passes through half mirrors HM1 and HM2, is reflected by concave mirror M and half mirror HM2, and is incident on the observation site E.
[0051] In this case, as shown in Figure 8, the equivalent optical system consists of a virtual SLM and one convex lens Lz (in the actual optical system, one concave mirror M as shown in Figure 7).
[0052] Thus, the equivalent optical system of a holographic HMD device has a single focusing / diverging element (lens Lz) that focuses or diverges light.
[0053] In this case, the optical calculation unit 22 (1) object light data u e The first operation B (inverse operation R{Z) converts the convergence / divergence elements into data u1 of the object light on the emission side. e1 (2) A second operation C (inverse operation Lr{f1}) that converts the object light data u1 on the exit side of the convergence / divergence element to the object light data u1' on the incident side of the convergence / divergence element, and (3) a third operation D (inverse operation R{Z 12}) and execute.
[0054] (3) Equivalent optical system and optical calculations for wide-field devices (holorooms) Figures 9 and 10 show the actual optical system and equivalent optical system of a wide-field display (holoroom), respectively. A wide-field display is an electronic hologram image display device that allows users to view large images.
[0055] Here, light from the light source LS is converted into parallel light by lens LzA, passes through half mirror HM, and irradiates the reflective SLM. The reflected light from the reflective SLM is then reflected by half mirror HM, passes through lens LzB, barrier BR, lens LzC, lens Lz2, and Lz1, and enters the observation site E.
[0056] In this case, lens LzB, barrier BR, and lens LzC correspond to the previously described 4f optical system OU. As a result, the equivalent optical system of the wide-field device is composed of a virtual SLM and two lenses Lz1 and Lz2, as shown in Figure 10. That is, the wide-field device has a microscope-like configuration that uses lenses Lz1 and Lz2 to magnify the image.
[0057] Thus, the equivalent optical system of a wide-field device has first and second converging / diverging elements (lenses Lz1, Lz2) that converge or diverge light.
[0058] In this case, the optical calculation unit 22 (1) object light data u e The fourth operation B (inverse operation R{Z}) converts this into data u1 of the object light on the output side of the first convergence / divergence element (lens Lz1). e1}) and (2) a fifth operation C (inverse operation L) that converts the data u1 of the object light on the outgoing side of the first convergence / divergence element to the data u1' of the object light on the incident side of the first convergence / divergence element. r {f1}) and (3) a sixth operation D (inverse operation R{z}) which converts the incident object light data u1' of the first convergence / divergence element to the output object light data u2 of the second convergence / divergence element (lens Lz2) 12}) and (4) a seventh operation E (inverse operation L) which converts the data u2 of the object light on the outgoing side of the second convergence / divergence element to the data u2' of the object light on the incident side of the second convergence / divergence element. r {f2}) and (5) an eighth operation F (inverse operation R{z}) which converts the incident object light data u2' of the second convergence / divergence element to object light data u3 in the spatial light modulator 31. 2h}) and execute.
[0059] [Examples of implementation using software] The functions of the hologram calculation device 20 (hereinafter referred to as "the device") can be realized by a program that causes the device to function as a computer, and by a program that causes each control block of the device (in particular each part included in the optical calculation unit 22) to function as a computer.
[0060] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., memory) as hardware for executing the program. By executing the program using this control device and storage device, the functions described in each of the embodiments are realized.
[0061] The above program may be recorded on one or more computer-readable recording media, not temporary ones. These recording media may or may not be provided by the above device. In the latter case, the program may be supplied to the above device via any wired or wireless transmission medium.
[0062] Furthermore, some or all of the functions of each of the above control blocks can also be realized by logic circuits. For example, an integrated circuit in which logic circuits functioning as each of the above control blocks are formed is also included in the scope of the present invention. In addition, it is also possible to realize the functions of each of the above control blocks by, for example, a quantum computer.
[0063] Furthermore, each process described in the above embodiments may be performed by AI (Artificial Intelligence). In this case, the AI may operate on the control device described above, or it may operate on other devices (for example, an edge computer or a cloud server).
[0064] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.
[0065] (summary) A hologram calculation device according to a first aspect of the present invention is a hologram calculation device for a hologram image display device that displays a hologram image, The hologram image display device is A spatial light modulator that displays interference fringes corresponding to a holographic image, An optical system for converting the aforementioned interference fringes into object light for observation by an observer, The observer has an observation area for observing the object light, The hologram calculation device is A data acquisition unit that acquires object light data corresponding to the hologram image, An optical calculation unit performs an inverse operation on the object light data that corresponds to the inverse conversion of the optical system, thereby generating interference fringe data for the spatial light modulator. It is equipped with.
[0066] With this configuration, an inverse operation corresponding to the reverse transformation of the optical system of the hologram image display device is performed on the object light data to generate interference fringe data for the spatial light modulator, thereby facilitating the display of hologram images on various hologram image display devices.
[0067] In the second aspect of the present invention, the hologram calculation device, in the first aspect, is such that the object light data is the object light data at the observation site, The optical system described above does not have a converging or diverging element that converges or diverges light. The optical calculation unit may perform calculations to convert the object light data into object light data in the spatial light modulator.
[0068] According to this configuration, when the optical system of the hologram image display device does not have a converging or diverging element that converges or diverges light, the display of a hologram image on the hologram image display device can be facilitated by performing a calculation to convert object light data into object light data in the spatial light modulator.
[0069] In the third aspect of the present invention, the hologram calculation device, in the first aspect, is such that the object light data is the object light data at the observation site, The optical system has one focusing / diverging element that focuses or diverges light, The optical calculation unit, A first operation to convert the object light data into object light data on the emission side of the convergence / divergence element, A second operation is performed to convert the data of the object light on the exit side of the convergence / divergence element to the data of the object light on the incident side of the convergence / divergence element. A third operation may be performed to convert the object light data on the incident side of the convergence / divergence element into object light data in the spatial light modulator.
[0070] According to this configuration, when the optical system of the hologram image display device has one convergence / divergence element that converges or diverges light, the display of a hologram image on the hologram image display device can be facilitated by performing the first to third operations.
[0071] In the fourth aspect of the present invention, the hologram calculation device, in the first aspect, is such that the object light data is the object light data at the observation site, The optical system is arranged in sequence between the spatial light modulator and the observation area and has first and second focusing / diverging elements that focus or diverge light. The optical calculation unit, A fourth operation is performed to convert the object light data into object light data on the emission side of the first convergence / divergence element, A fifth operation is performed to convert the data of the object light on the exit side of the first convergence / divergence element to the data of the object light on the incident side of the first convergence / divergence element, A sixth operation is performed to convert the data of the object light on the incident side of the first convergence / divergence element to the data of the object light on the exit side of the second convergence / divergence element, A seventh operation is performed to convert the data of the object light on the exit side of the second convergence / divergence element to the data of the object light on the incident side of the second convergence / divergence element, An eighth operation may be performed, which converts the object light data on the incident side of the second convergence / divergence element into object light data in the spatial light modulator.
[0072] According to this configuration, when the optical system of the hologram image display device has first and second converging / diverging elements that converge or diverge light, the display of hologram images on the hologram image display device can be facilitated by performing the fourth to eighth operations.
[0073] In the hologram calculation device according to the fifth aspect of the present invention, in any of the second to fourth aspects, the convergence / divergence element may be at least one of a convex lens, a concave lens, a concave mirror, and a convex mirror.
[0074] According to this configuration, when the converging / diverging element is at least one of a convex lens, a concave lens, a concave mirror, and a convex mirror, the display of hologram images on the hologram image display device can be facilitated.
[0075] A hologram calculation method according to a sixth aspect of the present invention is a hologram calculation method for a hologram image display device that displays a hologram image, The hologram image display device is A spatial light modulator that displays interference fringes corresponding to a holographic image, An optical system for converting the aforementioned interference fringes into object light for observation by an observer, The observer has an observation area for observing the object light, The hologram calculation method is Data acquisition process to obtain object light data corresponding to the hologram image, The optical processing involves performing an inverse operation corresponding to the inverse transformation of the optical system on the object light data to generate interference fringe data for the spatial light modulator. Includes.
[0076] With this configuration, an inverse operation corresponding to the reverse transformation of the optical system of the hologram image display device is performed on the object light data to generate interference fringe data for the spatial light modulator, thereby facilitating the display of hologram images on various hologram image display devices.
[0077] A hologram image display system according to the seventh aspect of the present invention comprises a hologram calculation device according to any one of aspects 1 to 5, An object light data transmission device that transmits object light data to the hologram calculation device, A hologram image display system equipped with the following features.
[0078] With this configuration, an inverse operation corresponding to the reverse transformation of the optical system of the hologram image display device is performed on the object light data to generate interference fringe data for the spatial light modulator, thereby facilitating the display of hologram images on various hologram image display devices.
[0079] A hologram calculation program according to the eighth aspect of the present invention is a hologram calculation program for causing a computer to function as a hologram calculation device according to any one of aspects 1 to 5, wherein the computer functions as the data acquisition unit and the optical calculation unit.
[0080] With this configuration, an inverse operation corresponding to the reverse conversion of the optical system of the hologram image display device 30 is performed on the object light data to generate interference fringe data for the spatial light modulator, thereby facilitating the display of hologram images on various hologram image display devices. [Examples]
[0081] An embodiment of the present invention is described below. In Figure 2, hologram data is shown for both cases: (a) when the lens Lz is placed between the observation area E and the SLM, and (b) when the lens Lz is not placed between the observation area E and the SLM.
[0082] Figures 11 and 12 are diagrams representing images of hologram data (object light data, etc.). Figure 11 shows the image OB and object light u e Figure 12 shows the interference fringe data Ha and Hb, and images Ia, Ib, Ia1, and Ib1.
[0083] Image OB represents the object used in the experiment. This object is a combination of a star-shaped figure and a black triangular figure placed in front of it. The black triangular figure partially obscures the star-shaped figure behind it. This object is 1 mm in height.
[0084] Image u e is object light data u e Represents object light data u e Since it is complex data, it is displayed as hologram data. Note that object light data u e This was determined by computer calculations based on the image OB.
[0085] Images Ha and Hb represent the SLM data in two cases: (a) when lens Lz is placed between the observation area E and the SLM, and (b) when lens Lz is not placed between the observation area E and the SLM. Images Ha and Hb represent the SLM data obtained by computer calculations.
[0086] Images Ha and Hb are different from each other, with image Ha being larger than image Hb. In image Hb, the image displayed by the hologram data is small and the banding is narrow, but it is magnified by the magnifying effect of lens Lz.
[0087] Image Ia is obtained by (a) using the SLM data of image Ha in an optical system in which lens Lz is placed between the observation area E and the SLM, with object light u e This shows an example of conversion, where image Ib is the SLM data of image Hb, and (b) object light u in an optical system where lens Lz is not placed between the observation site E and the SLM. e This shows an example of the conversion. Images Ia and Ib were formed from the SLM data of images Ha and Hb using the optical systems corresponding to Figures 6 and 8. Specifically, image Ia was formed by the optical system in Figure 6, and image Ib was formed by the optical system in Figure 8.
[0088] Images Ia and Ib are almost the same size. This is likely because the SLM data (images Ha and Hb) and the optical systems (a) and (b) are consistent.
[0089] Image Ia1 shows an example of an image where the SLM data of image Ha is displayed using an optical system (Figure 8) in which lens Lz is placed between the observation site E and the SLM, and image Ib1 shows an example of an image where the SLM data of image Hb is displayed using an optical system (Figure 6) in which lens Lz is not placed between the observation site E and the SLM.
[0090] Images Ia and Ib are of different sizes. This is likely because the SLM data (images Ha and Hb) and the optical system (b) and (a) are not matched.
[0091] As described above, using the 3D data of the object, object light data u e Furthermore, we were able to confirm that SLM data u2 could be formed (by computer calculation), and that the original object could be displayed on the hologram image display device 30 based on the SLM data u2. [Explanation of Symbols]
[0092] 1. Hologram Image Display System 10. Object Light Data Transmission Device 20 Hologram Processing Unit 21 Data Acquisition Unit 22 Optical calculation section 30 Hologram Image Display Devices 31. Spatial Light Modulator (SLM) 32 Optical system 33 Light source
Claims
1. A hologram processing device for a hologram image display device that displays holographic images, The hologram image display device is A spatial light modulator that displays interference fringes corresponding to a holographic image, An optical system for converting the aforementioned interference fringes into object light for observation by an observer, The observer has an observation area for observing the object light, The hologram calculation device is A data acquisition unit that acquires object light data corresponding to the hologram image, An optical calculation unit performs an inverse operation on the object light data that corresponds to the inverse conversion of the optical system, thereby generating interference fringe data for the spatial light modulator. A hologram calculation device equipped with the following features.
2. The object light data is the object light data at the observation site, The aforementioned optical system does not have a converging or diverging element that converges or diverges light. The hologram calculation device according to claim 1, wherein the optical calculation unit performs calculations to convert the object light data into object light data in the spatial light modulator.
3. The object light data is the object light data at the observation site, The optical system has one focusing / diverging element that focuses or diverges light, The optical calculation unit, A first operation to convert the object light data into object light data on the emission side of the convergence / divergence element, A second operation is performed to convert the data of the object light on the exit side of the convergence / divergence element to the data of the object light on the incident side of the convergence / divergence element. A third operation is performed to convert the object light data on the incident side of the convergence / divergence element into object light data in the spatial light modulator. The hologram calculation device according to claim 1.
4. The object light data is the object light data at the observation site, The optical system is arranged in sequence between the observation area and the spatial light modulator and has first and second focusing / diverging elements that focus or diverge light. The optical calculation unit, A fourth operation is performed to convert the object light data into object light data on the emission side of the first convergence / divergence element, A fifth operation is performed to convert the data of the object light on the exit side of the first convergence / divergence element to the data of the object light on the incident side of the first convergence / divergence element, A sixth operation is performed to convert the data of the object light on the incident side of the first convergence / divergence element to the data of the object light on the exit side of the second convergence / divergence element, A seventh operation is performed to convert the data of the object light on the exit side of the second convergence / divergence element to the data of the object light on the incident side of the second convergence / divergence element, The system performs an eighth operation which converts the object light data on the incident side of the second convergence / divergence element into object light data in the spatial light modulator. The hologram calculation device according to claim 1.
5. The hologram calculation device according to claim 2, wherein the converging / diverging element is at least one of a convex lens, a concave lens, a concave mirror, and a convex mirror.
6. A hologram calculation method for a hologram image display device that displays hologram images, The hologram image display device is A spatial light modulator that displays interference fringes corresponding to a holographic image, An optical system for converting the aforementioned interference fringes into object light for observation by an observer, The observer has an observation area for observing the object light, The hologram calculation method described above is: Data acquisition process to obtain object light data corresponding to the hologram image, The optical processing involves performing an inverse operation corresponding to the inverse transformation of the optical system on the object light data to generate interference fringe data for the spatial light modulator. A hologram calculation method, including the following.
7. A hologram calculation device according to any one of claims 1 to 5, An object light data transmission device that transmits object light data to the hologram calculation device, A hologram image display system equipped with the following features.
8. A hologram calculation program for causing a computer to function as a hologram calculation device according to any one of claims 1 to 5, wherein the computer functions as the data acquisition unit and the optical calculation unit.