A holographic imaging method and its holographic imaging device

Abstract

The present invention provides a holographic imaging method and a corresponding holographic imaging device. The imaging device is provided with more than one set of light source limiting parts or a limiting projection part group for directional projection of a display screen. One set of the limiting projection part group is provided with more than 2 limiting projection parts. The holographic imaging method comprises the following steps: 1.1 Making the limiting projection part group move, and making one end of one or more light sources that are successively or simultaneously projected onto the same pixel point or unit imaging area through the limiting projection parts in the same set of the limiting projection part group be projected transversely in a directional manner at the other end. When at least two limiting projection parts project onto the pixel point or unit imaging area at one end, the transverse projection directions at the other end are different; 1.2 During the movement of the limiting projection part group, the movement path of the limiting projection part is not centered on or spherical centered on the corresponding pixel point, so that different pictures are played on the imaging surface of the imaging device in more than 2 projection directions within one frame period.

Description

Technical Field

[0001] The present invention relates to a holographic imaging technology, and in particular to a holographic imaging technology obtained without light reflection, interference, and diffraction. Background Art

[0002] Holographic imaging is an advanced image technology. Current holographic imaging can present a three-dimensional image of an object by recording and reproducing the light wave information (including amplitude, phase, polarization, etc.) on the surface of the object, and the stereoscopic effect can be seen without wearing stereoscopic glasses. The following is a detailed introduction to the holographic imaging technology, including the current imaging technologies and their respective advantages and disadvantages:

[0003] I. Principle of Traditional Holographic Imaging Technology

[0004] The basic principle of traditional holographic imaging technology is to utilize the interference and diffraction of light. First, the specific light wave emitted by the object is recorded in the form of interference fringes through interference; then, these interference fringes are reproduced using the diffraction principle to form a three-dimensional image of the original object. Since all the light wave information of the object is recorded, the reproduced image has a strong sense of three-dimensionality and has exactly the same three-dimensional characteristics as the original object.

[0005] II. The main traditional holographic imaging technologies mainly include the following:

[0006] Transmission Holographic Imaging

[0007] Principle: Coherent light is used to irradiate the object. The reflected light and scattered light on the surface of the object reach the recording plate to form an object light wave; at the same time, another reference light wave (plane light wave or spherical light wave) is introduced to irradiate the recording plate. After exposing the recording plate, an interference pattern, that is, a holographic display image, can be obtained. During reproduction, the recording plate is irradiated with the same light wave as the reference light wave. When the human eye observes the holographic plate in the transmitted light, a reproduced image exactly the same as the original object can be observed at the original position of the object behind the plate.

[0008] Disadvantage: It is necessary to use lasers for recording and reproduction, and there are drawbacks of speckle effects.

[0009] Reflection Holographic Imaging

[0010] Principle: The object is placed on the right side of the holographic plate, and a coherent point light source irradiates the holographic plate from the left. The light directly irradiated onto the plane of the holographic plate is used as the reference light; and the light transmitted through the holographic plate (the unprocessed holographic plate is transparent) is projected onto the object, and the light reflected back from the object to the holographic plate is used as the object light. After the two beams of light interfere, a holographic display image is formed. During reproduction, the holographic plate is irradiated with a light source from the left. Each stripe layer in the holographic plate reflects the reproduced light like a mirror, and the reproduced image can be observed at the original position of the object when observing the holographic plate in the reflected light.

[0011] Disadvantages: Usually a relatively thick recording medium is used in production, and the cost may be high.

[0012] Other common disadvantages of traditional holographic imaging technology - it is difficult to seamlessly splice the images formed by multiple holographic imaging devices. The specific reasons are as follows:

[0013] 1. Limitations of imaging range and viewing angle

[0014] Holographic imaging is usually limited by the viewing angle and imaging range of its projection system. Each device can only generate clear images within its specific viewing angle and range. When trying to splice these images together, it is necessary to ensure that they can be seamlessly docked in space and the viewing angle and depth information are consistent. However, due to the complexity of holographic imaging and the characteristics of light propagation, this is often difficult to achieve.

[0015] 2. Light interference and overlap

[0016] In the areas where multiple holographic imaging devices are adjacent or overlapping, the light may interfere with each other, resulting in image distortion or overlap. This interference may be caused by light leakage, scattering or reflection between the devices. To solve this problem, special optical elements or filters need to be used to reduce light interference, or the interference effect can be reduced by optimizing the device layout and angle settings.

[0017] Object of the invention

[0018] Under such a background, the present invention provides a holographic imaging method and device that do not utilize the reflection, interference and diffraction of light, and further uses the holographic imaging method and device to achieve seamless splicing of holographic images without limiting the number of holographic devices. Summary of the invention

[0019] In order to understand the technical solution of the present invention, the following terms are specifically defined for the present invention:

[0020] Imaging surface: During the operation of the imaging device, it is the plane or arc surface where imaging occurs; the imaging surface is different from the combination of light sources. A static combination of light sources may be linear. Only through persistence of vision during movement can a linear combination of light sources form a complete imaging picture, and the imaging surface of the linear combination of light sources is the set of the movement trajectories of the light source group within one frame period.

[0021] Pixel point: Different from light sources (such as LED lamp beads), the position of a pixel point in the imaging surface is specific and fixed. It can be a physical pixel point (the LED lamp bead that forms the image of a certain pixel point coincides with this pixel point at a certain time point), or it can be a virtual pixel point (the LED lamp bead that forms the image of a certain pixel point does not coincide with this pixel point at a certain time point); while the light source can move during operation.

[0022] Unit imaging area: When the line formed by the light sources in the same row of the imaging device is a curve, specifically, in order to increase the pixel density, the present invention proposes that when the next column of lamp beads rotates to the current position of the lamp beads in this column, it can just fill the gap between two adjacent lamp beads in this column; therefore, it is inaccurate to use a single pixel point when evaluating imaging indicators. Therefore, the present invention application adopts a unit imaging area; the unit imaging area described in the present invention refers to the area between two adjacent light sources in the same column of this light source, and / or the area between two adjacent light sources in the same row of this light source; for example: the light source group in the row where the light source B2 is located, in the arrangement order, includes A2, B2, C2, that is, in the same row, the previous light source of B2 is A2, and the next light source of B2 is C2; the light source group in the column where the light source B2 is located, in the arrangement order, includes B1, B2, B3, that is, in the same row, the previous light source of B2 is B1, and the next light source of B2 is B3; then the unit imaging area where B2 is located is the area between A2 and C2, or the area between B1 and B3, excluding the endpoints.

[0023] Frame period: The display duration for the imaging device to play a frame of picture, and the duration required for the light source group to display a frame of picture. Horizontal direction: The tangential direction of the light source movement path.

[0024] Vertical direction: The direction perpendicular to the light source movement path.

[0025] Horizontal component: The vector component of a certain vector in the tangential direction of a certain point on the light source movement path.

[0026] Vertical component: The vector component obtained by projecting a certain vector onto the normal plane at a certain point on the light source movement path.

[0027] Light channel (limiting projection part) orientation angle a: The included angle Z between two horizontal boundary lines of the visible area of a pixel point or virtual pixel point (both boundary lines pass through this pixel point or virtual pixel point); Z is divided into n regions by n limiting projection parts, denoted as c1, c2...c n ; The included angle between two vertical boundary lines of the visible area of this pixel point or virtual pixel point is Y (both boundary lines pass through this pixel point or virtual pixel point); Y is divided into m regions by m groups of limiting projection parts, denoted as e1, e2...e m ; Within one frame period, the user can see this pixel point in these n*m regions, and the images in each region can be independently controlled; taking the horizontal direction as an example, the angle bisector of c n and the tangent of the imaging surface is the included angle a n is called the orientation angle of the light channel (limiting projection part) corresponding to c n projected in the horizontal direction (as shown in Figure 3 ).

[0028] Imaging platform: Scenarios applicable to the imaging device, such as the wall of a building (especially when the imaging device is installed on more than one wall and / or the ground and / or the ceiling), the desktop, the exhibition stand, etc.

[0029] To achieve the above object, the technical solution provided by the present invention includes:

[0030] (I) Regarding the holographic imaging method

[0031] A holographic imaging method, wherein the holographic imaging method uses a light source group or a display screen of an imaging device to play a dynamic video or a static picture of 3D modeling; the imaging surface of the imaging device includes N1, N2... Nm... Nn, a total of n pixel points; the imaging device is provided with a pixel multi-directional split projection control device, and the pixel multi-directional split projection control device is provided with a limited projection part for splitting and directionally projecting the imaging surface (the smallest split area can be used as a unit imaging area), and the holographic imaging method includes the following steps:

[0032] 1.1 Through the limited projection part, one or more light sources passing through a pixel point are divergently projected laterally, so that the divergence angle c of the projection light of the light source passing through the limited projection part in the lateral direction is less than 20 degrees, further limited to less than 10 degrees, and further limited to less than 2 degrees;

[0033] 1.2 Control the pixel multi-directional split projection control device to make the limited projection part rotate or swing, and then make the imaging surface of the imaging device play different pictures in more than 5 projection directions within one frame period (further limited to play different pictures in more than 10 projection directions).

[0034] The control method of the pixel multi-directional split projection control device in step 1.2 is: create a unit imaging area, and the unit imaging area is the area between the previous pixel point and the next pixel point in the same column of the pixel point, or the area between the previous pixel point and the next pixel point in the same row of the pixel point; within one frame period, make the projection direction of the unit imaging area where the pixel point is located change more than 5 times; or create a virtual screen, and at least 5 or more light channels (limited projection parts) on the limited projection part are the same unit imaging area.

[0035] The rule for the imaging device to play pictures in step 1.2: If the reverse extension line of a projection direction of the limited projection part where the pixel point Nm passes intersects a point P on the modeling surface, then the pixel point Nm forms an image of the point P in this projection direction;

[0036] Or if a column of pixel points intersects a line L on the modeling surface through the reverse extension plane of a projection direction of the limited projection part, then the column of pixel points forms an image of the line L in this projection direction.

[0037] The divergence angle c of the projection light of the light source described in step 1.1 in the longitudinal direction is less than 25 degrees, and further, the divergence angle c in the longitudinal direction is less than 12 degrees.

[0038] Step 1.1 is further defined as that one or more light sources passing through a pixel point are directionally projected in a four-pyramid-shaped light beam through the light-limiting projection part.

[0039] The lateral component of the angle between the projection direction of the pixel point and the imaging surface is greater than 0° and less than 180°, and further, it is defined as greater than 3.6° and less than 176.4°.

[0040] While the light-limiting projection part described in step 1.2 rotates or swings, the light source group or the display screen of the imaging device rotates synchronously or asynchronously.

[0041] (II) Regarding the holographic imaging device

[0042] Solution 1: The light channel (light-limiting projection part) points to the pixel points of the physical screen

[0043] A holographic imaging device, the holographic imaging device includes an imaging lamp group or a display screen, and a pixel multi-directional split control device; the pixel multi-directional split control device is provided with a driving device and a light-limiting projection part group that divides the imaging surface into blocks and projects directionally; assuming that a group of light-limiting projection part groups includes n light-limiting projection parts, let

[0044] The rotation angle of the mth (or column) light-limiting projection part relative to the (m - 1)th (or column) light-limiting projection part, that is, the included angle between the mth (or column) light-limiting projection part, the (m - 1)th (or column) light-limiting projection part and the center line of the rotation trajectory is d m ;

[0045] The included angle between the projection directions of the light-limiting projection parts of the mth column and the (m - 1)th column passing through the same point successively is b m;

[0046] The orientation angle of the mth (or column) light-limiting projection part is a m， The divergence angle is c m ; then there is

[0047]

[0048] Further, the divergence angles of the n columns of light-limiting projection parts in the same light-limiting projection part group are the same, then there is c m= () / n;

[0049] Solution 2: The light channel (light-limiting projection part) points to the pixel points of the virtual screen

[0050] (III) Application of a holographic imaging device. On the application platform, for example, imaging devices are arranged on at least two surfaces in the building space, so that the imaging devices on the two surfaces form an included angle.

[0051] All the pixel points on the motion path passing through the same unit imaging area pass through this unit imaging area. The static rays of the directional pixel light sources in the same circle passing through the same point have:

[0052] Points on multiple models matching the same channel, showing the point farthest from the screen

[0053] A virtual coordinate system is established, and the position of the imaging device on the virtual coordinate system is set; the position of the static or dynamic 3D model on the virtual coordinate system is set; the imaging device includes more than one cylindrical (tracked) display screen, and the cylindrical display screen is provided with more than one circle of directional pixel light sources. During the rotation process, at least two directional pixel light sources passing through the same point and in the same circle face different directions; so that when the cylindrical display screen rotates one cycle, that is, within one frame period, the cylindrical display screen plays images of different angles of the 3D model in different directions.

[0054] If the connection line between the point on the model and the pixel point or virtual pixel point is exactly on the same straight line as the ray midline of a certain channel of this pixel point, then the light beads corresponding to this channel play the image of this point on the model.

[0055] When the extension line of the pixel light source projection channel intersects multiple points on the model, the pixel point light source plays the image of the point on the model closest to the imaging surface or virtual imaging surface.

[0056] Advantages:

[0057] The holographic imaging method provided by the present invention restricts a pixel point to independently image in different orientations during the movement through multiple limited projection parts in the same group; multiple limited projection parts (directional light channels) in the same group of light sources pass through the same imaging area successively, simulating the superposition effect of multiple points on an object projected onto this imaging area; enabling users to see the light source imaging at different positions corresponding to different angles of the object (3D model), and at the same time enabling the left and right eyes to see the images of the object (3D model) corresponding to the angles respectively (the images seen by the left eye and the right eye are different, and are respectively the images that the left eye and the right eye would see of the real object); thereby establishing a visual effect of integrating a virtual object into the real world.

[0058] The present invention adopts the visual persistence cooperation technology, so that the points on the light source / LCD screen no longer specifically correspond to a certain pixel point on the imaging surface. In particular, the movement trajectories of multiple limited projection parts of the same / group of light sources in the present invention do not take the light source (group) or pixel point as the center of a circle or a sphere, and are realized by avoiding specific trajectory routes through the movement of multiple limited projection parts and their movements:

[0059] The multi-directional imaging of a single pixel point is achieved through the cooperation of multiple light-limiting projection parts and more than one light-emitting diode (LED) bead, enabling independent and separate imaging of any pixel point in multiple directions. Considering the visual error of the human eye, the video source played by the holographic imaging device of the present invention can be a stereoscopic floating image integrated with multi-angle and all-round perspectives. From the holographic imaging method and the imaging device of the present invention, although any pixel point has the condition to achieve a 360-degree distributed light-limiting projection part (light channel) in both the horizontal and vertical directions, it is not necessary. Taking Embodiment 5 of the present invention as an example, the light channel projection within the range of 180 degrees - 360 degrees overlaps with the light channel imaging of other pixel points within the range of 0 - 180 degrees. Therefore, unless it is used to compensate for the imaging density (filling the gaps between pixel points), a double-image visual viewing problem will occur. The number of light-limiting projection parts in the same group and the angular range of their distribution can be restricted according to the matching hardware technical specifications (here, the angle can be evaluated by the angle between the projection direction of the light-limiting projection part and the tangent of its movement trajectory).

[0060] The imaging area of any pixel point or unit imaging area of the present invention can be in various forms such as a sector, a sphere, etc. Within this area, the imaging angle can be arbitrary, that is, the polar angle and azimuth angle in the three-dimensional polar coordinate system can be arbitrary. At the same time, the overall imaging surface of the imaging device of the present invention can be a polyhedron, a cylinder, a sphere, etc. and / or an imaging platform that can form an enclosed space. Therefore, the images of virtual three-dimensional people, objects, or scenes from different angles can be viewed in any direction to achieve true holographic imaging.

[0061] The present invention realizes the multi-directional imaging of a single pixel point through the cooperation of multiple light-limiting projection parts and more than one LED bead. Compared with solutions such as a single LED bead and a single light channel, the requirement for the refresh rate of the LED bead or the screen can be significantly reduced.

[0062] The greater distribution density of the horizontal channels than that of the vertical channels in the holographic imaging device provided by the present invention is conducive to the optimal allocation of device resources, including reducing the computational load and device cost under the premise of meeting the vast majority of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 Schematic diagram of the cooperation between the imaging barrel screen 1 and the pixel point projection direction limiting barrel 2 in Embodiment 1;

[0064] Figure 2 Schematic diagram of the horizontal projection of a single group of light-limiting projection parts and LED beads in Embodiment 1;

[0065] Figure 3 Light-limiting projection part A1 in Embodiment 1 16 Schematic diagram of the projection light rays when it rotates to point O;

[0066] Figure 4 Light-limiting projection part A1 in Embodiment 1 15 、A1 16Schematic diagram of sequential rotation to point O;

[0067] Figure 5 Schematic diagram of the light projection distribution when each light-limiting part of the light-limiting part group A1 in Example 1 is sequentially rotated to point O;

[0068] Figure 6 Schematic cross-sectional view of the holographic imaging device in Example 2;

[0069] Figure 7 Schematic diagram of the cooperation between the display screen 1” and the light-limiting part group 2” in Example 5;

[0070] Figure 8 Schematic diagram of the cooperation between a single lamp bead and a single light-limiting part in Example 5;

[0071] Figure 9 Schematic diagram of the splicing cooperation of multiple holographic imaging devices in Example 5;

[0072] Figure 10 Schematic plan view of the holographic imaging device in Example 6;

[0073] Figure 11 Schematic top view of the holographic imaging device in Example 6;

[0074] Figure 12 Schematic diagram of the imaging of the holographic imaging device in Example 6. Detailed implementation manner Example 1

[0075] Such as Figure 1 A holographic imaging device as shown, including an imaging barrel screen 1, a pixel point projection direction limiting barrel 2, a circuit board, a rotating tray, a motor, a base, and a transparent cover; the pixel point projection direction limiting barrel 2 is fixedly sleeved on the imaging barrel screen 1, the imaging barrel screen 1 and the circuit board are fixedly arranged on the carbon brush rotating tray, the rotating tray is fixedly arranged on the rotating shaft of the motor, and the motor is fixedly arranged on the base, so that the motor can drive the rotating tray and the image barrel screen, the pixel point projection direction limiting barrel, and the circuit board thereon to rotate together;

[0076] The circuit board includes a playback circuit, an SD slot, and a drive circuit; both the imaging barrel screen and the circuit board are provided with 5V power terminals and 16D cable interfaces, and the 16D cable interface of the circuit board is connected to the playback circuit; the video signal is transmitted by connecting the cable interfaces of the imaging barrel screen and the circuit board through a 16D cable, and the power terminals of the imaging barrel screen and the circuit board are connected through a power cord;

[0077] A carbon brush connector is provided at the bottom of the rotating tray. The carbon brush connector includes a power input terminal and a power output terminal. The power input terminal and the power output terminal are coaxial and rotatably connected. The positive electrode of the power input terminal is rotationally connected to the positive electrode of the power output terminal through a carbon brush, and the negative electrode of the power input terminal is rotationally connected to the negative electrode of the power output terminal through a carbon brush. The power input terminal and the power output terminal of the carbon brush connector are both provided with a hollow in the middle, so that the rotating shaft of the motor extends into the hollows in the middle of the power input terminal and the power output terminal and is fixed to the rotating tray. The power output terminal is fixed to the bottom of the rotating tray, and the power input terminal is fixed on the base or the motor. The base is provided with a 5V power adapter, and the output terminal of the power adapter is connected to the power input terminal of the carbon brush connector. The power output terminal of the carbon brush connector is connected to the 5V power terminal of the circuit board.

[0078] The imaging barrel screen is provided with an LED flexible display screen with a size of 640mm * 160mm, a refresh rate of 3840, a longitudinal bead pitch P1.25 (1.25mm), and a transverse bead pitch P2.5 (2.5mm); that is, the imaging barrel screen is distributed with matrix LED beads, including 128 rows, with 16 * 16 beads in each row (the beads in each row are divided into 16 groups, with 16 LED beads in each group).

[0079] The pixel point projection direction limiting barrel is distributed with 16 groups of optical channels (limiting projection groups): A1, A2, A3, A3... A8 and B1, B2, B3... B8 are arranged in central symmetry respectively; each group of limiting projection groups has 128 rows, with 16 optical channels (limiting projections) in each row; the pixel point projection direction limiting barrel has 128 rows, with 256 optical channels (limiting projections) in each row, which correspond one-to-one with the 128 * 256 LED beads of the imaging barrel screen. That is, one end of each optical channel (limiting projection) is sleeved on and only on one LED bead (when the LED bead rotates to a new pixel point position, the bead is refreshed once).

[0080] The limiting projection is a through hole and / or a grating and / or a convex lens. The through hole is a frustum through hole or a prism through hole to limit the viewing angle of the corresponding bead. The viewing angle of the bead / pixel point is decomposed into a longitudinal component and a transverse component. The following introduces the projection angle of the through hole of the limiting projection as the viewing angle of the bead / pixel point:

[0081] Both the transverse component c and the longitudinal component e of the divergence angle of the optical channel (limiting the viewing angle of the corresponding bead) of the limiting projection are 5.625°, and the transverse component b of the projection direction angle when two adjacent limiting projections pass through the same point is also 5.625°, that is, c = b; the transverse components of the projection directions of the limiting projections in the same group of limiting projection groups with the tangent of the screen are 45° (a1), 50.625°, 56.625°... 135° (a n) The longitudinal component of the projection direction of the limited projection part in the same group of limited projection part groups forms the same angle with the tangent of the imaging surface; the visible angle Z of the pixel points on the imaging surface = b * (n - 1) + c (where n is the number of limited projection parts in a limited projection part group);

[0082] The minimum value of the included angle between the transverse component of the observable boundary of the pixel points limited by the same group of limiting parts and the tangent of the imaging surface

[0083] a min =a 1- -c / 2 = 45° - c / 2 = 42.1875°,

[0084] The maximum value of the included angle between the transverse component of the observable boundary of the pixel points limited by the same group of limiting parts and the tangent of the imaging surface

[0085] a max =a n +c / 2 = 135° + c / 2 = 137.8125°,

[0086] Therefore, the set of the transverse components of the observable regions of the pixel points limited by each limiting part in the same group (the transverse visible range of the pixel points) is 42.1875° - 137.8125°;

[0087] The longitudinal component of the projection direction of the limited projection parts of the limited projection part groups A1, A2, A3... A8 and B1, B2, B3... B8 forms an included angle range with the imaging surface of 67.5° - 112.5° and is evenly distributed, and the longitudinal component of the included angle between the projection directions of adjacent two groups of limited projection parts is 5.625°, that is, the longitudinal components of the included angles between the projection directions of A1, A2, A3... A8 and the screen are 67.5, 73.125°, 78.75°, 84.375°... 112.5° respectively, and the longitudinal components of the included angles between the projection directions of B1, B2, B3... B8 and the screen are also 67.5, 73.125°, 78.75°, 84.375°... 112.5° respectively.

[0088] The imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one week, and 256 LED lamp beads pass by the same pixel point, and it includes 128 orientations; that is, for the same pixel point, 128 directional light channels (limited projection parts) are evenly distributed within the range of 45° - 135° horizontally and 67.5° - 112.5° vertically, and each light channel (limited projection part) independently displays the imaging of the video content corresponding to the angle; further, to realize the imaging barrel screen driving the pixel point projection direction limiting barrel to rotate one week, the holographic imaging device plays a frame of picture corresponding to the angle in 128 directions respectively (the directions with the same included angle with the imaging surface are regarded as the same direction).

[0089] Working principle:

[0090] The limited projection unit group is provided with n columns of limited projection units, where

[0091] Let the included angle between the projection direction Xm of the m-th limited projection unit and the tangent L2 of its movement trajectory L1 be a m ; the included angle between the projection directions of the m-th and the (m - 1)-th limited projection units is b m ; the projection direction X m-1 of the (m - 1)-th limited projection unit and the included angle with the tangent of its movement trajectory is a m-1 ; the divergence angle of the m-th limited projection unit is c m , then there is

[0092] a m = b m + a m-1

[0093] Such as Figures 2 - 5 shown, taking the A1 group of limited projection unit groups as an example, it includes limited projection units A11, A12, A13... limited projection unit A1 16 , the longitudinal components of the projection directions of each limited projection unit in the A1 group are all; there are a total of 16 limited projection units and their lamp beads that pass through any point O successively within one frame period; taking the O point as the origin, a three-dimensional polar coordinate system is established, where the radial distance ρ, polar angle θ, and azimuth angle φ; then

[0094] The polar angle and azimuth angle of the light rays projected from A11 are respectively: θ ∈ (67.5, 73.125), φ ∈ (45°, 50.625°)

[0095] The polar angle and azimuth angle of the light rays projected from A12 are respectively: θ ∈ (67.5, 73.125), φ ∈ (50.625°, 56.35°) ...

[0096] From A1 16 The polar angle and azimuth angle of the projected light rays are respectively: θ ∈ (67.5, 73.125), φ ∈ (129.375°, 135°)

[0097] Such as Figure 5 shown, it is equivalent to projecting 16 images at 16 angles from the O point in the directions of θ ∈ (67.5, 73.125) and φ ∈ (45°, 135°); it should be noted that any two adjacent limited projection units (A15, A16) in the same group of this embodiment have an overlapping area with a width of the lamp bead diameter D. Since the lamp bead diameter is small and at most one overlapping area can be seen by one eye, the overall visual effect is less affected.

[0098] The holographic imaging method is as follows:

[0099] Establish a virtual coordinate system and set the position of the imaging barrel screen on the virtual coordinate system; set the position of the static or dynamic 3D modeling on the virtual coordinate system; rotate the imaging barrel screen for one cycle, and the static rays of the directional light sources (including one light channel (limiting projection part) and one LED lamp bead) in the same row passing through the same point have the following: if the line where the light channel (limiting projection part) is located intersects the modeling at multiple points, then this channel plays the image of the point closest to the pixel point where the light channel (limiting projection part) is located;

[0100] How to determine which light sources emit images at what angles

[0101] For the connection line between a point on the modeling and a pixel point, if the ray midline of a certain channel of this pixel point is exactly on the same straight line, then this channel emits the image of this point

[0102] The closest point where the extension line of the pixel light source projection channel intersects the modeling is the imaging point of the pixel point light source.

[0103] Refresh rate verification: At the same time point, there are 2 LEDs in one direction, and the pixel point index for imaging in the same row is 256*2 (realizing full screen P1.25, resolution 512*128). Therefore, the refresh number corresponding to each LED for forming one frame is 256*2 / 2 = 256; thus, the rated maximum number of frames that can be played in this embodiment is 3840 / 256 = 15 (frames). Since people are used to viewing with the horizontal line of sight between their eyes or close to the horizontal, the individual control requirement for the longitudinal light channels is relatively small. Subsequently, all the projection resources of the limiting projection part can be allocated to the horizontal projection changes, that is, the number of distinguishable viewing angles of the unit imaging area on the imaging lamp or screen through the limiting projection part in the horizontal projection is greater than that in the longitudinal projection, and then the refresh rate resources are concentrated on the horizontal projection changes and increasing the number of frames; specifically, it can be replaced with the following 2 schemes:

[0104] Scheme 1: Replace the limiting projection part groups A1, A2, A3...A8 and B1, B2, B3...B8 with 16 groups of limiting projection part groups A1, and the limiting projection parts in the same group and the same column are longitudinally connected; according to the above algorithm, the number of played frames can be increased to 8 times the original, that is, 120 frames, which is obviously unnecessary.

[0105] Scheme 2: Increase the number of limiting projection parts in each group, and then increase the included angle range between the horizontal component and the imaging surface. For example: Replace the limiting projection part groups A1, A2, A3...A8 and B1, B2, B3...B8 with 4 groups of limiting projection part groups A. The limiting projection part group A is provided with 64 limiting projection parts. Correspondingly, the included angle range between the horizontal component and the imaging surface is 0 - 180°, and the divergence angle of the limiting projection part is 2.8125 degrees.

[0106] In this embodiment, the display light source or the display screen (imaging barrel screen) rotates or swings or makes other movements synchronously with the multi-directional projection part of the pixel points (pixel point projection direction limiting barrel).

[0107] On the imaging barrel screen described in this embodiment, the line composed of the same row of LED lamp beads can be a straight line or a curve. For example, Figure 3 As shown in the curved lamp bead combination, it is beneficial to fill the gaps between the lamp beads in the same column, thereby increasing the pixel density of the imaging surface. When the line composed of the same row of LED lamp beads is a straight line, the same pixel point has more than 2 changes in the projection direction within the same frame period (in this embodiment, there are 16 * 8 = 128 changes); when the line composed of the same row of LED lamp beads is a curve, the number of changes of the same pixel point in the projection direction will obviously decrease. Since the longitudinal positions of the LED lamp beads in the same row are close (otherwise the image is prone to tomograms), the evaluation index can be replaced by more than 2 changes in the projection direction of the same unit imaging area. Embodiment 2

[0108] As Figure 6 shown, the holographic imaging device described in Embodiment 1 is replaced with a clearance fit between the pixel point projection direction limiting barrel 2' and the imaging barrel screen 1'. One end of the imaging barrel screen 1' and the circuit board are fixed on the base 3'. The video cable of the circuit board is connected to an external signal source device through the base 3'; the motor 4' is arranged in the hollow part of the imaging barrel screen 1', and the motor shaft is fixed to drive the pixel point projection direction limiting barrel to rotate. Correspondingly, when one end of each light channel (limiting projection part) is projected onto and only onto one LED lamp bead, the lamp bead is refreshed once.

[0109] The imaging barrel screen is replaced with a 2-piece 320mm * 160mm, 3840 refresh rate, longitudinal lamp bead distance P1.25 (1.25mm), and transverse lamp bead distance P1.25 (1.25mm) LED flexible display screen. The distributed matrix LED lamp beads include 128 rows, with 256 * 2 lamp beads in each row.

[0110] In this embodiment, the imaging barrel screen does not participate in rotation or other movements. Therefore, the image data, playback software, and power supply can all be connected to devices outside the device through wires, while greatly reducing the cost of using wireless technologies such as WIFI and Bluetooth.

[0111] In this embodiment, the imaging barrel screen can be set with a display screen only on the front (visible surface) according to the needs of the viewing surface, and no display screen or other imaging light sources are provided on the back to save hardware costs. Embodiment 3

[0112] The holographic imaging device described in Embodiment 1 is replaced with a clearance fit between the pixel point projection direction limiting barrel and the imaging barrel screen. The pixel point projection direction limiting barrel and the imaging barrel screen are respectively driven by a motor to rotate or swing, and their rotation or swing is asynchronous. Embodiment 4

[0113] A holographic imaging device described in Embodiment 1, where the pixel point projection direction limiting barrel only targets the LED beads on the imaging barrel screen and only sets lateral limits, specifically as follows:

[0114] The imaging barrel screen is evenly distributed with matrix LED beads, including 128 rows, with 256 beads in each row; the beads in each row are divided into 2 groups, with 128 LED beads in each group; the pixel point projection direction limiting barrel is evenly distributed with matrix optical channels (limiting projection parts), including 2 groups of grating groups symmetrically arranged at the center, and each group of grating groups has 128 columns of trapezoidal grooves; the included angle between the two side surfaces of the trapezoidal groove is 1.35°; because the cross-section of the trapezoidal groove is trapezoidal, the included angle B between the angle bisector L2 of the included angle of the two waists of the trapezoid and the imaging surface ranges from 3.6° to 176.4°, and the included angle between adjacent two L2s is 1.35°, that is, the included angle B between the trapezoidal grooves of each group of grating groups and the screen is 3.6°, 4.95°, 6.3°... 176.4° in sequence.

[0115] The 256 columns of trapezoidal grooves of the 2 groups of grating groups of the pixel point projection direction limiting barrel correspond one by one to the 256 columns of LED beads on the imaging barrel screen, that is, each column of LED beads on the imaging barrel screen is within and only within one column of trapezoidal grooves of the pixel point projection direction limiting barrel.

[0116] When the imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one week, the same pixel point has 256 LED beads passing by and projects towards 128 directions within the range of 3.6° - 176.4° horizontally; that is, for the same pixel point, 128 directional optical channels (limiting projection parts) are evenly distributed, and each optical channel (limiting projection part) independently displays an image; further, when the imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one week, the holographic imaging device plays one frame of picture in 128 directions respectively (those with the same included angle with the imaging surface are regarded as the same direction).

[0117] The holographic imaging method is as follows:

[0118] Establish a virtual coordinate system, set the position of the imaging barrel screen on the virtual coordinate system; set the position of the static or dynamic 3D modeling on the virtual coordinate system; make the imaging barrel screen rotate one cycle, and for the static section S of the same column of pixels passed by the same column of directional light sources (including one column of trapezoidal grooves and one column of LED beads), all the angle bisectors L2 of the grooves are on the plane S, and the plane S intersects the modeling at multiple straight lines, then the image of the straight line closest to the imaging surface is played by the beads in this column. Embodiment 5

[0119] As Figures 7 - 9A holographic imaging device as shown includes two flexible LED displays 1" or flexible OLED displays 1", a circuit board, a rotating tray, a motor, a base, and a transparent cover; each display 1" is provided with a set of light-limiting part groups 2"; the displays 1" and the circuit board are fixed on the carbon brush rotating tray, the rotating tray is fixed on the rotating shaft O" of the motor, and the motor is fixed on the base, so that the motor can drive the rotating tray and the displays 1", the light-limiting part groups 2", and the circuit board on it to rotate together.

[0120] The display 1" is provided with 128 columns of LED lamp beads, and each column contains 128 lamp beads; the light-limiting part group 2" is provided with 128 columns of light-limiting parts, and the light-limiting parts of the light-limiting parts are in the shape of trapezoidal grooves, that is, the cross-section S" of the light-limiting part is trapezoidal, the bottom of the trapezoidal groove is located on the upper base (short side) of the trapezoid, and the lamp beads are located in the trapezoidal groove, so that the light of the lamp beads is projected from the notch of the trapezoidal groove.

[0121] The core of this embodiment is that the angle bisectors of the two waists of the trapezoidal cross-section S" of the trapezoidal groove passing through the LED lamp beads in the light-limiting parts belonging to the same group intersect at a point D", so as to achieve the visual effect that the light of the same group of light-limiting parts projects from the same virtual pixel point D"; the locus of D" corresponding to a row of LED lamp beads when the light-limiting part rotates one circle around the rotating shaft O" is a circle U", so the virtual screen of this embodiment is a cylindrical surface with U" as the cross-section.

[0122] The LED lamp beads with the included angle range of the horizontal component of the projection direction of each group of light-limiting parts and the imaging surface being 0-180° are the imaging of this virtual pixel point, and the LED lamp beads with 180-360° are the supplementary imaging of the front pixel points.

[0123] In this embodiment, the two groups of light-limiting part groups can be symmetrically arranged to reduce the requirement for the refresh rate, or can be arranged to fill the blank of the observation area of adjacent light-limiting parts with each other when passing through the same point.

[0124] As Figure 9 As shown, the holographic imaging devices of Embodiments 1-5 can be spliced in multiple; on the non-observation surface (such as: the back) of the holographic imaging devices of Embodiments 1-5 (with the middle of the pixel point projection direction limiting barrel and the imaging barrel screen hollowed out), a reflector can be set. When the LED and other light sources rotate to the back of the device, they are transmitted to the observable surface through the reflector, so as to make full use of the hardware resources to improve the resolution and / or display frame number and / or viewing angle, etc.

[0125] For the holographic imaging devices of Embodiments 1-4, the number of light-limiting parts and the number of light sources can be different. Embodiment 6

[0126] As Figures 10 - 12A holographic imaging device as shown, which is composed of more than 2 planar rotating lamp fan devices. The planar rotating lamp fan device is provided with a rotating base 1 and more than one lamp fan 2, and the lamp fan 2 is installed on the rotating base 1; the length of the lamp fan ≥ the diameter of the rotating base; the lamp beads or the unit display area of the lamp fan are provided with rotatable limited projection parts, one end of the limited projection part is provided with a metal block, and a magnetic attraction device 3 (such as a permanent magnet) is provided on one side (such as the top) of the planar rotating lamp fan device, so that the end provided with the metal block always points to the same direction, so as to ensure that the limited projection part only laterally limits the visible angle of the lamp beads or the display screen, and is visible in the longitudinal direction.

[0127] At least two planar rotating lamp fan devices are symmetrically arranged, and the rotating shafts are not parallel. The lamp fan of one planar rotating lamp fan device can cross the base of the other, so that the imaging surfaces 4 of the two planar rotating lamp fan devices can both cover the base of the other.

[0128] The composition of multiple planar rotating lamp fan devices in this embodiment can enclose an arc surface or a multi-planar and other enclosed spaces.

[0129] The holographic imaging devices of Embodiments 1-6 can be spliced with multiple of the same type, or can be spliced with multiple of multiple types, so that the total imaging picture forms more than one arc surface or multi-planar and other enclosed spaces.

Claims

1. A holographic imaging method, characterized in that: The holographic imaging method employs more than one imaging device. The imaging device is provided with an imaging light group or a display screen for playing dynamic videos or static pictures of 3D modeling, and more than one group of light-limiting parts for restricting the directional projection of the imaging light group or the display screen; the imaging light group or the display screen includes multiple light sources, and one group of light-limiting parts is provided with more than 2 light-limiting parts. The imaging surface of the imaging device includes N1, N2... Nm... Nn, a total of n pixel points; the holographic imaging method includes the following steps: 1.1 The light-limiting parts rotate or swing, and one or more light sources are independently imaged at different orientations within the same unit imaging area through multiple light-limiting parts in the same group; the projection light of the light source through the light-limiting parts is divergently projected in the horizontal direction, and when at least two light-limiting parts are projected onto the same unit imaging area at one end, the horizontal projection directions at the other end are different; the unit imaging area is the area between the previous pixel point and the next pixel point in the same column of pixel points, and / or the area between the previous pixel point and the next pixel point in the same row of pixel points; 1.2 During the rotation or swing of the light-limiting part group, the movement path of the light-limiting part is not centered on or spherical centered on the corresponding pixel point, so that different-angle pictures of the dynamic video or static picture are played on the imaging surface of the imaging device in more than 2 projection directions within one frame period.

2. The holographic imaging method according to claim 1, characterized in that: The control method for the light-limiting part in step 1.2 to enable the imaging surface of the imaging device to play pictures at different angles in more than 2 projection directions within one frame period is as follows: 2.1 Determine the position of the imaging surface: Set the intersection line of the reverse extension surfaces of the light-limiting parts in the same light-limiting part group or the intersection point of the reverse extension lines as the unit imaging area, and set the set of the unit imaging areas as the imaging surface; 2.2 If a point P is obtained by the intersection of the reverse extension line of one projection direction of the light-limiting part and the modeling surface for the pixel point Nm, then the pixel point Nm is the image of the point P in this projection direction; Or if a line L is obtained by the intersection of the reverse extension surface of one projection direction of the light-limiting part and the modeling surface for a column of pixel points, then the column of pixel points is the image of the line L in this projection direction.

3. The holographic imaging method according to claim 1, characterized in that: In step 1.1, the projection light of the light source through the light-limiting part is divergently projected in the horizontal direction, and the divergence angle c in the horizontal direction is less than 10 degrees.

4. A holographic imaging method according to claim 1, characterized in that: The pixel points are physical pixel points or virtual pixel points.

5. The holographic imaging method according to claim 1, characterized in that: During the movement process, within the same group of light-limiting part groups, at least 3 reverse extension surfaces of the light-limiting parts intersect at the same straight line successively or the reverse extension lines intersect at one point successively.

6. The holographic imaging method according to claim 1, characterized in that: Step 1.1 is further limited to that the light source is directionally projected through the light-limiting part in a four-pyramid-shaped light beam.

7. A holographic imaging method according to claim 1, wherein: When the movement of the light-limiting part in step 1.2 is rotation, the imaging light group or the display screen of the imaging device rotates synchronously or asynchronously.

8. A holographic imaging method according to claim 1, characterized in that It further includes the following steps: 1.3 At least 2 imaging devices are arranged on the imaging platform so that the imaging surfaces of the imaging platform form an enclosed space.

9. A holographic imaging device adopting the holographic imaging method described in claim 1, characterized in that: The holographic imaging device includes an imaging light group or a display screen, a pixel multi-directional projection unit, and a driving device; the driving device is drivingly connected to the pixel multi-directional projection unit and causes the pixel multi-directional projection unit to move; the pixel multi-directional projection unit is provided with more than one set of limiting projection units, and each set of limiting projection units is provided with more than 3 limiting projection units; one end of the limiting projection unit faces the imaging light group or the display screen, and the light source on the imaging light group or the display screen is directionally projected towards the other end of the limiting projection unit; Within the same set of limiting projection units, at least the reverse extension planes of 3 limiting projection units intersect at the same straight line or the reverse extension lines intersect at one point; Or During the movement, within the same set of limiting projection units, at least the reverse extension planes of 3 limiting projection units intersect at the same straight line or the reverse extension lines intersect at one point successively.

10. A holographic imaging device according to claim 9, characterized in that: The set of limiting projection units is provided with n columns of limiting projection units, where Let the angle between the projection direction of the limiting projection unit in the m-th column and the tangent line L2 of its movement trajectory L1 be am; the angle between the projection directions of the limiting projection units in the m-th column and the (m - 1)-th column when they pass through the same point successively be bm; the angle between the projection direction of the limiting projection unit in the (m - 1)-th column and the tangent line of its movement trajectory be am-1; the divergence angle of the limiting projection unit in the m-th column be cm, where m ≥ 2; then there is a m =b m +a m-1 , a n -a1 = = c1 + c2 +...c m +...c n 。 11. A holographic imaging device according to claim 10, wherein: The divergence angles of the n columns of limiting projection units in the set of limiting projection units are the same, and there is c m = (a n - a1) / n.

12. A holographic imaging device according to claim 9 or 10 or 11, characterized in that: The number of sets of limiting projection units of the pixel multi-directional projection unit is less than the number or the number of columns of the limiting projection units included in the set of limiting projection units, so that the number of distinguishable viewing angles projected horizontally by the imaging light group or the display screen through the limiting projection units is greater than the number of distinguishable viewing angles projected vertically.

Images