Holographic imaging method and holographic imaging device thereof

Abstract

The invention provides a holographic imaging method and a corresponding holographic imaging device, the imaging device is provided with more than one projection limiting part group for limiting directional projection of a light source group or a display screen, and one projection limiting part group is provided with more than two projection limiting parts; the holographic imaging method comprises the following steps: 1.1, enabling projection limiting parts to move, enabling one end to sequentially or simultaneously project one or more light sources of the same pixel point or unit imaging area through projection limiting parts of the same projection limiting part, and enabling the other end to perform directional projection in the transverse direction, when one end of at least two projection limiting parts projects on the pixel point or the unit imaging area, the transverse projection directions of the other ends of the projection limiting parts are different; and 1.2, in the movement process of the projection limiting part group, the movement path of the projection limiting part does not take the corresponding pixel point as the circle center or the sphere center, so that the imaging surface of the imaging device plays different pictures in more than two projection directions in one frame period.

Description

Technical Field

[0001] The present invention relates to a holographic imaging technology, in particular to a holographic imaging technology which is not obtained through reflection, interference and diffraction of light. Background Art

[0002] Holographic imaging is an advanced imaging technology. The current holographic imaging can present a three-dimensional image of an object by recording and reproducing the light wave information (including amplitude, phase and polarization, etc.) on the surface of the object. The three-dimensional effect can be seen without wearing stereo glasses. The following is a detailed introduction to holographic imaging technology, including current imaging technologies and their respective advantages and disadvantages: 1. Principle of Traditional Holographic Imaging Technology The basic principle of traditional holographic imaging technology is to use the interference and diffraction of light. First, the specific light waves emitted by the object are recorded in the form of interference fringes through interference; then, these interference fringes are reproduced using the principle of diffraction 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 three-dimensional sense and has exactly the same three-dimensional characteristics as the original object.

[0003] 2. Traditional holographic imaging technologies mainly include the following: Transmission holographic imaging Principle: Use coherent light to illuminate the object, and the reflected light and scattered light on the surface of the object will form an object light wave after reaching the recording plate; at the same time, another reference light wave (plane light wave or spherical light wave) is introduced to illuminate the recording plate. After the recording plate is exposed, an interference pattern, i.e., a holographic display image, can be obtained. When reproducing, the recording plate is illuminated with the same light wave as the reference light wave, and the human eye views the holographic plate in the transmitted light, and can see a reconstructed image that is exactly the same as the original object behind the plate.

[0004] Disadvantages: Requires laser recording and reproduction, and has the drawback of speckle effect.

[0005] Reflective holographic imaging Principle: Place the object on the right side of the holographic plate, and a coherent point light source illuminates the holographic plate from the left. The light directly irradiated onto the plane of the holographic plate is used as the reference light; the light that passes through the holographic plate (the untreated holographic plate is transparent) is directed toward the object, and the light reflected back to the holographic plate by the object is used as the object light. The two beams of light interfere to form a holographic display image. When reproducing, the light source is used to illuminate the holographic plate from the left, and the stripe layers in the holographic plate reflect the reproduced light like a mirror. When the holographic plate is viewed in the reflected light, the reproduced image can be viewed at the original object.

[0006] Disadvantages: Thicker recording media is usually used during production, which may be more expensive.

[0007] Other common shortcomings of traditional holographic imaging technology - it is difficult to seamlessly splice multiple holographic imaging devices. The specific reasons are as follows: 1. Imaging range and viewing angle limitations

[0008] Holographic imaging is usually limited by the viewing angle and imaging range of its projection system. Each device can only produce a clear image within its specific viewing angle and range. When trying to stitch these images together, it is necessary to ensure that they are seamless in space and that 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. 2. Light interference and overlap

[0009] In areas where multiple holographic imaging devices are adjacent or overlapped, light may interfere with each other, causing image distortion or overlap. This interference may be caused by light leakage, scattering or reflection between devices. To solve this problem, special optical elements or filters are needed to reduce light interference, or the impact of interference can be reduced by optimizing the device layout and angle settings. Purpose of the Invention

[0010] In this context, the present invention provides a holographic imaging method and device that do not require the use of light reflection, interference and diffraction, and further utilizes the holographic imaging method and device to achieve seamless splicing of holographic images without limiting the number of holographic devices. Summary of the invention

[0011] In order to understand the technical solution of the present invention, the following glossary is given for the present invention: Imaging plane: refers to the plane or arc surface where the image is formed when the imaging device is working; the imaging plane is different from the combination of light sources. The static light source combination may be linear, and the linear light source combination can form a complete imaging picture only through visual persistence during movement, and the imaging plane of the linear light source combination is the collection of the motion trajectories of the light source group within a frame period.

[0012] Pixel points: Different from light sources (such as LED lamp beads), the position of pixel points in the imaging plane is specific and fixed. They can be physical pixels (the LED lamp beads that form an image of a certain pixel at a certain point in time overlap with the pixel at that point in time) or virtual pixels (the LED lamp beads that form an image of a certain pixel at a certain point in time do not overlap with the pixel at that point in time). The light source can move during operation.

[0013] Unit imaging area: when the line composed of the light sources in the same row of the imaging device is a curve, specifically, in order to improve the pixel density, the present invention proposes that when the lamp beads in the next column are rotated to the current position of the lamp beads in this column, the gap between the two adjacent lamp beads in this column can be just filled; therefore, when evaluating the imaging index, it is inaccurate to use one pixel point, so 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 the present light source, and / or the area between two adjacent light sources in the same row of the present light source; such as: the light source group in the row where the light source B2 is located, in order of arrangement, includes A2, B2, and 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 order of arrangement, includes B1, B2, and 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.

[0014] Frame period: the duration of a frame played by an imaging device, the duration of a light source group's movement to display a frame. Horizontal: the tangent direction of the light source's movement path.

[0015] Longitudinal direction: The vertical direction of the light source's movement path.

[0016] Horizontal component: the vector component in the tangent direction of a vector at a point on the light source's motion path.

[0017] Longitudinal component: The vector component obtained by projecting a vector onto the normal plane at a point on the light source's motion path.

[0018] Light channel (limited projection part) orientation angle a: the angle Z between the two horizontal boundary lines of the visible area of ​​a pixel or virtual pixel (both boundary lines pass through the pixel or virtual pixel); Z is divided into n areas through n limited projection parts, recorded as c1, c2...c n ; The angle between the two vertical boundary lines of the visible area of ​​the pixel or virtual pixel is Y (both boundary lines pass through the pixel or virtual pixel); Y is divided into m areas by m groups of limited projection parts, recorded as e1, e2...e m ;In one frame period, the user can see the pixel in these n*m ​​areas, and the image of each area can be controlled independently; Taking the horizontal direction as an example, c n The angle a between the angle bisector of the image plane and the tangent line n Called c n The corresponding light channel (limited projection part) is oriented at an angle in the horizontal projection (such as Figure 3 as shown).

[0019] Imaging platform: a scene where the imaging device is applicable, 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), a desktop, a booth, etc.

[0020] To achieve the above object, the technical solution provided by the present invention includes: 1. About holographic imaging method A holographic imaging method, 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 a 3D model; the imaging surface of the imaging device includes N1, N2...Nm...Nn, with a total of n pixels; the imaging device is provided with a pixel point multi-directional projection and control device, and the pixel point multi-directional projection and control device is provided with a projection limiting part for dividing the imaging surface into blocks and directional projection (the block with the smallest area can be made into a unit imaging area), and the holographic imaging method comprises the following steps: 1.1 The projection limiting portion is used to make one or more light sources passing through a pixel point diverge and project in a horizontal direction, so that the divergence angle c of the projection light of the light source passing through the projection limiting portion in the horizontal direction is less than 20 degrees, further limited to less than 10 degrees, and further limited to less than 2 degrees; 1.2 Control the multi-directional projection of the pixels to control the devices, so that the projection limiter rotates or swings, and then the imaging surface of the imaging device plays different pictures in more than 5 projection directions within one frame period (further, it is limited to playing different pictures in more than 10 projection directions).

[0021] The control method of the multi-directional pixel projection control device in step 1.2 is: creating a unit imaging area, the unit imaging area is the area between the previous pixel and the next pixel in the same column of the pixel, or the area between the previous pixel and the next pixel in the same row of the pixel; within one frame period, the projection direction of the unit imaging area where the pixel is located changes more than 5 times; or creating a virtual screen, at least 5 optical channels on the limited projection part (limited projection part) are in the same unit imaging area.

[0022] The rule for the imaging device to play the picture in step 1.2 is: if the pixel point Nm passes through a point P where the reverse extension line of a projection direction in the projection limiting part intersects with the modeling surface, then the pixel point Nm emits an image of point P in the projection direction; Or if a row of pixel points passes through a line L in which a reverse extension of the projection direction in the projection limiting portion intersects the modeling surface, then the row of pixel points is the image of the line L in the projection direction.

[0023] In step 1.1, the divergence angle c of the projected light from the light source through the projection limiting portion in the longitudinal direction is less than 25 degrees, and further the divergence angle c in the longitudinal direction is less than 12 degrees.

[0024] Step 1.1 is further defined as one or more light sources passing through a pixel point are directed and projected in a four-pyramid-shaped light beam through a projection limiting portion.

[0025] 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 is further limited to be greater than 3.6° and less than 176.4°.

[0026] When the projection limiting part in step 1.2 rotates or swings, the light source group or the display screen of the imaging device rotates synchronously or asynchronously.

[0027] (II) About holographic imaging device Solution 1: The optical channel (limited projection part) points to the pixels of the physical screen A holographic imaging device, comprising an imaging light group or a display screen, and a pixel point multi-directional projection control device; the pixel point multi-directional projection control device is provided with a driving device and a projection limiting unit group for dividing the imaging surface into blocks and directional projection; assuming that a projection limiting unit group includes n projection limiting units, let The rotation angle of the mth (or row) limiting part relative to the m-1th (or row) limiting part, that is, the angle between the mth (or row) limiting part, the m-1th (or row) limiting part and the center of the rotation trajectory is d m ; The included angle between the projection directions of the mth column and the m-1th column passing through the same point is b m; The orientation angle of the mth (or row) limiting part is a m， The divergence angle is c m ; then there is

[0028] Furthermore, if the divergence angles of the n columns of the same limiting unit group are the same, then c m= () / n; Solution 2: The optical channel (limited projection part) points to the pixel points of the virtual screen (III) An application of a holographic imaging device, wherein the imaging devices are arranged on at least two surfaces of an application platform, such as a building space, so that the imaging devices on the two surfaces form an angle.

[0029] All the pixels of the same unit imaging area are passed through by the motion path, and the static rays of the same circle of directional pixel light sources passing through the same point have: Matches multiple modeled points on a channel, showing the point farthest from the screen Establish a virtual coordinate system, set the position of the imaging device on the virtual coordinate system; set the position of the static or dynamic 3D modeling on the virtual coordinate system; the imaging device includes more than one cylindrical (track) display screen, the cylindrical display screen is provided with more than one circle of directional pixel light sources, and during the rotation process, at least two directional pixel light sources passing through the same point and the same circle have different directions; so that the cylindrical display screen rotates for one cycle, that is, within one frame cycle, the cylindrical display screen plays images of different angles of the 3D modeling in different directions; If the line connecting the point on the model and the pixel point or virtual pixel point is exactly the same as the midline of the ray of a channel of the pixel point, then the lamp bead corresponding to the channel plays the image of the point on the model; When the extension line of the pixel light source projection channel intersects the modeling at multiple points, the pixel point light source plays the image of the point on the modeling that is closest to the imaging surface or the virtual imaging surface. Benefits:

[0030] The holographic imaging method provided by the present invention limits a pixel point to independently form images in different directions during movement through the same group of multiple limiting projection parts; the light sources of the same group of multiple limiting projection parts (directional light channels) pass through the same imaging area one after another, simulating the superposition effect of multiple points on the object projected onto the imaging area; the light source images seen by the user at different positions correspond to images of the object (3D modeling) at different angles, and the left and right eyes also see images of the object (3D modeling) at corresponding angles (the image seen by the left eye is different from the image seen by the right eye, and they are the images of the entity seen by the left eye and the right eye respectively); thereby establishing a visual effect of virtual objects integrating into the real world.

[0031] The present invention adopts the technology of persistence of vision coordination, so that the point on the light source / LCD screen no longer specifically corresponds to a certain pixel point on the imaging surface. In particular, the motion trajectory of multiple projection limiting parts of the present invention that cooperate with the same / group of light sources does not take the light source (group) or pixel point as the center of the circle or the center of the sphere. The avoidance of the specific trajectory route by multiple projection limiting parts and their movement is realized: By cooperating with multiple projection limiting parts and more than one lamp bead, multi-directional imaging of a pixel can be achieved, and any pixel can be imaged independently in multiple directions. In combination with the visual error of the human eye, the video source played by the holographic imaging device of the present invention can be an integrated multi-angle, all-round three-dimensional suspended image; from the perspective of the holographic imaging method of the present invention and the imaging device used, any pixel point has the conditions to realize 360-degree distribution of projection limiting parts (optical channels) in the horizontal and vertical directions, but it is not necessary. Taking Example 5 of the present invention as an example, the projection of the optical channel in the range of 180 degrees to 360 degrees overlaps with the imaging of the optical channel of other pixel points in the range of 0-180 degrees. Therefore, unless it is used to compensate for the imaging density (compensate for the gaps between pixel points), there will be a visual viewing problem of ghosting. The number of projection limiting parts in the same group and the distribution angle range can be limited according to the hardware technical indicators (the angle here can be evaluated by the angle between the projection direction of the projection limiting part and the tangent of its motion trajectory).

[0032] The imaging area of ​​any pixel point or unit imaging area of ​​the present invention can be in various forms such as fan-shaped, spherical, etc., and within this area, the imaging angle can be arbitrary, that is, the polar angle and azimuth angle in three-dimensional polar coordinates can be arbitrary; at the same time, the overall imaging surface of the imaging device of the present invention can be a polyhedron, cylinder, sphere, etc. and / or can form an imaging platform that surrounds the space, so that images of virtual three-dimensional people, objects or scenes at different angles can be viewed in any direction to achieve true holographic imaging.

[0033] The present invention realizes multi-directional imaging of a pixel by cooperating multiple projection limiting parts with more than one lamp beads. Compared with solutions such as a single lamp bead and a single light channel, the requirements for the lamp bead or screen refresh rate can be greatly reduced.

[0034] The lateral channel distribution density of the holographic imaging device provided by the present invention is greater than the longitudinal channel distribution density, which is beneficial to the optimal configuration of equipment resources, including reducing the amount of calculation and reducing equipment costs while meeting the vast majority of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the cooperation between the imaging barrel screen 1 and the pixel projection direction limiting barrel 2 in Example 1; Figure 2 This is a schematic diagram of the horizontal projection of a single set of projection limiting parts and lamp beads in Example 1; Figure 3 The limiting part A1 of the embodiment 1 16 Schematic diagram of the projected light when rotating to point O; Figure 4 The limiting part A1 of the embodiment 1 15 、A1 16 Schematic diagram of the coordination of rotating to point O successively; Figure 5This is a schematic diagram of light projection distribution when each projection limiting part of the projection limiting part group A1 of Example 1 rotates to point O in sequence; Figure 6 It is a cross-sectional schematic diagram of the holographic imaging device of Example 2; Figure 7 This is a schematic diagram of the cooperation between the display screen 1" and the projection limiting unit 2" of Example 5; Figure 8 This is a schematic diagram of the coordination between a single lamp bead and a single projection limiting portion in Example 5; Fig. 9 This is a schematic diagram of the splicing and coordination of multiple holographic imaging devices in Example 5; Fig.10 This is a plan view of the holographic imaging device of Example 6; Fig.11 This is a top view schematic diagram of the holographic imaging device of Example 6; Fig.12 This is a schematic diagram of imaging of the holographic imaging device of Example 6. DETAILED DESCRIPTION Example 1

[0036] like Figure 1 A holographic imaging device shown includes an imaging barrel screen 1, a pixel projection direction limiting barrel 2, a circuit board, a rotating tray, a motor, a base, and a transparent cover; the pixel 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 mounted on the carbon brush rotating tray, the rotating tray is fixedly mounted on the rotating shaft of the motor, and the motor is fixedly mounted on the base, so that the motor can drive the rotating tray and the imaging barrel screen, the pixel projection direction limiting barrel, and the circuit board thereon to rotate together; The circuit board includes a playback circuit, an SD slot, and a driving circuit; the imaging barrel screen and the circuit board are both provided with a 5V power supply terminal and a 16D cable interface, and the 16D cable interface of the circuit board is connected to the playback circuit; the imaging barrel screen and the cable interface of the circuit board are connected through the 16D cable to transmit the video signal, and the imaging barrel screen and the power terminal of the circuit board are connected through the power line; A carbon brush connector is provided at the bottom of the rotating tray, and the carbon brush connector includes a power input end and a power output end, the power input end and the power output end are coaxial and rotatably connected, the positive pole of the power input end is rotatably connected with the positive pole of the power output end through a carbon brush, and the negative pole of the power input end is rotatably connected with the negative pole of the power output end through a carbon brush; the power input end and the power output end of the carbon brush connector are both provided with a middle hollow, so that the rotating shaft of the motor extends into the middle hollow of the power input end and the power output end and is fixed to the rotating tray; the power output end is fixedly arranged at the bottom of the rotating tray, and the power input end is fixedly arranged on the base or on the motor; the base is provided with a 5V power adapter, and the output end of the power adapter is connected to the power input end of the carbon brush connector; the power output end of the carbon brush connector is connected to the 5V power terminal of the circuit board.

[0037] The imaging barrel screen is provided with an LED flexible display screen of 640mm*160mm, a refresh rate of 3840, a longitudinal lamp bead distance of P1.25 (1.25mm), and a lateral lamp bead distance of P2.5 (2.5mm); that is, the imaging barrel screen distributes matrix LED lamp beads, including 128 rows, each row of 16*16 lamp beads (each row of lamp beads is divided into 16 groups, each group of 16 LED lamp beads); The pixel projection direction limiting barrels are distributed in a matrix of 16 groups of light channels (projection limiting parts): A1, A2, A3, A3...A8 are arranged in a central symmetry with B1, B2, B3...B8 respectively; each group of projection limiting parts has 128 rows, and each row has 16 light channels (projection limiting parts); the pixel projection direction limiting barrels have 128 rows, and each row has 256 light channels (projection limiting parts), which correspond one-to-one to the 128*256 LED lamp beads of the imaging barrel screen, that is, one end of each light channel (projection limiting part) is placed on and only on one LED lamp bead (when the LED lamp bead rotates to a new pixel position, the lamp bead is refreshed once).

[0038] The projection limiting part is a through hole and / or a grating and / or a convex lens, and the through hole is a truncated cone through hole or a prism through hole to limit the viewing angle of the corresponding lamp bead. The viewing angle of the lamp bead / pixel point is decomposed into a longitudinal component and a lateral component; the following is an introduction based on the projection angle of the through hole of the projection limiting part as the viewing angle of the lamp bead / pixel point: The lateral component c and longitudinal component e of the divergence angle of the projection limiter as a light channel (limiting the viewing angle of the corresponding lamp beads) are both 5.625°. The lateral component b of the projection direction angle when two adjacent projection limiters pass through the same point is also 5.625°, that is, c=b; the lateral components of the projection direction of the projection limiter and the screen tangent angle in the same group of projection limiters are 45°(a1), 50.625°, 56.625°...135°(a2) respectively. n), the longitudinal component of the projection direction of the projection limiter in the same projection limiter group is at the same angle as the tangent line of the imaging surface; the visible angle Z of the pixel point on the imaging surface is Z=b*(n-1)+c (n is the number of projection limiters in a projection limiter group); The minimum value of the angle between the lateral component of the observable boundary of the pixel point and the tangent line of the imaging surface in the same group of limiting parts a min =a 1- -c / 2=45°-c / 2=42.1875°, The maximum value of the angle between the lateral component of the observable boundary of the pixel point in the same group and the tangent line of the imaging surface a max =a n +c / 2=135°+c / 2=137.8125°, Therefore, the set of lateral components of the observable area of ​​the pixel points defined by each defining part of the same group (lateral visible range of the pixel points) is 42.1875°-137.8125°; The angle range between the longitudinal component of the projection direction of the limiting part of the limiting part groups A1, A2, A3...A8 and B1, B2, B3...B8 and the imaging surface is 67.5°-112.5° and is evenly distributed, and the longitudinal component of the angle between the projection directions of two adjacent groups of limiting parts is 5.625°, that is, the longitudinal components of the angle between the projection direction 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 angle between the projection direction of B1, B2, B3...B8 and the screen are also 67.5, 73.125°, 78.75°, 84.375°...112.5° respectively.

[0039] The imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one circle, and 256 LED lamp beads pass through the same pixel point, including 128 directions; that is, the same pixel point has 128 directional light channels (projection limiting parts) evenly distributed in the range of 45°-135° horizontally and 67.5°-112.5° vertically, and each light channel (projection limiting part) independently displays the imaging of the corresponding angle of the video content; further, the imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one circle, and the holographic imaging device plays a frame of the corresponding angle in 128 directions respectively (the angle with the imaging surface is regarded as the same direction).

[0040] Working principle: The limiting unit group is provided with n columns of limiting units, wherein Let the angle between the projection direction Xm of the mth projection limiter and the tangent line L2 of its motion trajectory L1 be a m ; The included angle between the projection directions of the mth and m-1th projection limiting parts is bm ; The projection direction X of the m-1th projection limit part m-1 The angle between the tangent line and its trajectory is a m-1 ; The divergence angle of the mth limited projection part is c m , then a m =b m +a m-1 like Figure 2-5 As shown, taking the A1 group of limited throwing parts as an example, it includes limited throwing parts A11, limited throwing parts A12, limited throwing parts A13...limit throwing parts A1 16 , the longitudinal component of the projection direction of each projection limiter in group A1 is ; a total of 16 projection limiters and their lamp beads pass through any point O in one frame period; take point O as the origin and establish a three-dimensional polar coordinate system, in which the radial distance ρ, polar angle θ and azimuth angle φ are ; then The polar angle and azimuth angle of the light projected from A11 are: θ∈(67.5, 73.125), φ∈(45°, 50.625°) The polar angle and azimuth angle of the light projected from A12 are: θ∈(67.5, 73.125), φ∈(50.625°, 56.35°) ... From A1 16 The polar angle and azimuth angle of the projected light are: θ∈(67.5, 73.125), φ∈(129.375°, 135°) like Figure 5 As shown, it is equivalent to projecting images of 16 angles in 16 directions from point O at θ∈ (67.5, 73.125), φ∈ (45°, 135°); it should be pointed out that in this embodiment, any two adjacent projection limiting parts (A15, A16) in the same group have an overlapping area with a width of the lamp bead diameter D. Since the diameter of the lamp bead is small and one eye can only see one overlapping area at most, the overall perception is less affected.

[0041] The holographic imaging method is as follows: Establish a virtual coordinate system, set the position of the imaging bucket screen on the virtual coordinate system; set the position of the static or dynamic 3D modeling on the virtual coordinate system; make the imaging bucket screen rotate for one cycle, and the static rays of the directional light source in the same row (including a light channel (limited projection part) and an LED lamp bead) passing through the same point have: the straight line where the light channel (limited projection part) is located intersects with the modeling at multiple points, then the channel plays the image of the point closest to the pixel point where the light channel (limited projection part) is located; How to determine which light sources emit images at what angles If the line connecting the modeling point and the pixel point is exactly the same as the midline of the ray of a channel of the pixel point, then the image of the point emitted by the channel is The closest point where the extended line of the pixel light source projection channel intersects the modeling is the imaging point of the pixel light source.

[0042] Refresh rate verification: A direction includes 2 LEDs at the same time point, and the pixel index of the same row of imaging is 256*2 (full screen P1.25, resolution 512*128), so the refresh number of each LED corresponding to one frame is 256*2 / 2=256; therefore, the rated maximum playable frame number of this embodiment is 3840 / 256=15 (frames). Since people are accustomed to watching horizontally or nearly horizontally with their eyes connected, the demand for separate control of the longitudinal light channel is relatively small, and then the projection resources of the projection limiter can be allocated to the horizontal projection changes, even if the number of distinguishable viewing angles of the unit imaging area on the imaging light or screen through the projection limiter in the horizontal projection is greater than the number of distinguishable viewing angles in the vertical projection, and then the refresh rate resources are concentrated on the horizontal projection changes and the increase in the number of frames; specifically, it can be replaced by the following two solutions: Solution 1: Replace the limited projection group A1, A2, A3...A8 and B1, B2, B3...B8 with 16 limited projection group A1, and connect the limited projection parts in the same group and column vertically; according to the above algorithm, the number of playback frames can be increased to 8 times the original, that is, 120 frames, which is obviously unnecessary.

[0043] Solution 2: Increase the number of projection limiting parts in each group, and then increase the angle range between the lateral component and the imaging surface, such as replacing the projection limiting part groups A1, A2, A3...A8 and B1, B2, B3...B8 with 4 projection limiting part groups A, the projection limiting part group A is provided with 64 projection limiting parts, the corresponding lateral component and the imaging surface The angle range is 0-180°, and the divergence angle of the projection limiting part is 2.8125 degrees.

[0044] In this embodiment, the display light source or display screen (imaging barrel screen) and the pixel multi-directional projection part (pixel projection direction limiting barrel) rotate or swing or do other movements synchronously.

[0045] In the imaging barrel screen described in this embodiment, the lines formed by the same row of LED lamp beads can be straight lines or curves, such as Figure 3The curved lamp bead combination shown is beneficial to fill the gaps between the lamp beads in the same column, thereby improving the pixel density of the imaging surface. When the line composed of the LED lamp beads in the same row is a straight line, the same pixel point has more than 2 changes in the projection direction in the same frame period (this embodiment has 16*8=128 changes); when the line composed of the LED lamp beads in the same row is a curve, the number of changes in the projection direction of the same pixel point will obviously decrease. Since the longitudinal positions of the LED lamp beads in the same row are close (otherwise the image is prone to faults), the evaluation index can be replaced by the same unit imaging area having more than 2 changes in the projection direction. Example 2

[0046] like Figure 6 As shown, a holographic imaging device described in Example 1 is replaced with a pixel projection direction limiting barrel 2' and an imaging barrel screen 1' with a gap fit, and one end of the imaging barrel screen 1' and the circuit board are fixed to the base 3', and the video line of the circuit board is connected to the external signal source device through the base 3'; the motor 4' is set in the hollow part of the imaging barrel screen 1', and the motor shaft is fixed to drive the pixel projection direction limiting barrel to rotate. Correspondingly, when one end of each light channel (limiting part) is projected on and only on one LED lamp bead, the lamp bead is refreshed once.

[0047] The imaging barrel screen is replaced with two 320mm*160mm LED flexible display screens with a refresh rate of 3840, a longitudinal lamp bead distance of P1.25 (1.25mm), and a lateral lamp bead distance of P1.25 (1.25mm), distributed matrix LED lamp beads, including 128 rows, with 256*2 lamp beads in each row.

[0048] The imaging barrel screen of this embodiment does not participate in rotation or other movements, so image data, playback software, and power supply can be connected to devices outside the device through wires, while greatly reducing the cost of using wireless technologies such as WIFI and Bluetooth.

[0049] The imaging barrel screen of this embodiment can be provided with a display screen only on the front side (viewable side) according to the needs of the observation surface, while no display screen or other imaging light source is provided on the back side, so as to save hardware costs. Example 3

[0050] The holographic imaging device described in Example 1 is replaced by a pixel point projection direction limiting barrel and an imaging barrel screen that are gap-matched. The pixel point projection direction limiting barrel and the imaging barrel screen are respectively driven by a motor to rotate or swing, and the rotation or swing of the two are not synchronized. Example 4

[0051] In a holographic imaging device described in Example 1, the pixel projection direction limiting barrel is only for the imaging barrel screen LED lamp beads, and only a horizontal limit is set, as follows: The imaging barrel screen has uniformly distributed matrix LED lamp beads, including 128 rows, with 256 lamp beads in each row; each row of lamp beads is divided into 2 groups, with 128 LED lamp beads in each group; the pixel projection direction limiting barrel has uniformly distributed matrix light channels (projection limiting parts), including 2 groups of grating groups arranged symmetrically, each grating group is provided with 128 columns of trapezoidal grooves; the angle between the two side surfaces of the trapezoidal groove is 1.35°; because the cross-section of the trapezoidal groove is a trapezoid, the angle B between the angular bisector L2 of the two waist angles of the trapezoid and the imaging surface ranges from 3.6° to 176.4°, and the angle between two adjacent L2s is 1.35°, that is, the angle B between the trapezoidal grooves of each group of grating groups and the screen is 3.6°, 4.95°, 6.3°...176.4° respectively.

[0052] The two grating groups of the pixel point projection direction limiting barrel have a total of 256 columns of trapezoidal grooves, which correspond one-to-one to the 256 columns of LED lamp beads in the imaging barrel screen, that is, each column of LED lamp beads in the imaging barrel screen is in and only in one column of trapezoidal grooves in the pixel point projection direction limiting barrel.

[0053] The imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one circle, and 256 LED lamp beads pass through the same pixel point, and are projected in 128 directions within the horizontal range of 3.6°-176.4°; that is, for the same pixel point, 128 directional light channels (projection limiting parts) are evenly distributed, and each light channel (projection limiting part) displays the image independently; further, the imaging barrel screen drives the pixel point projection direction limiting barrel to rotate one circle, and the holographic imaging device plays a frame of the picture in each of the 128 directions (the directions with the same angle with the imaging surface are regarded as the same direction).

[0054] The holographic imaging method is as follows: A virtual coordinate system is established, and the position of the imaging barrel screen is set on the virtual coordinate system; the position of the static or dynamic 3D modeling is set on the virtual coordinate system; the imaging barrel screen rotates for one cycle, and the static section S of the same column of directional light sources (including a column of trapezoidal grooves and a column of LED lamp beads) passing through the same column of pixel points has all the angular bisectors L2 of the grooves on the plane S, and the plane S intersects with the modeling on multiple straight lines, then the column of lamp beads plays the image of the straight line closest to the imaging surface. Example 5

[0055] like Figure 7-9 A holographic imaging device shown includes two LED flexible display screens 1" or OLED flexible display screens 1", a circuit board, a rotating tray, a motor, a base, and a transparent cover; each display screen 1" is provided with a group of projection limiting parts 2"; the display screen 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 display screen 1", the projection limiting part group 2", and the circuit board thereon to rotate together.

[0056] The display screen 1" is provided with 128 rows of LED lamp beads, each row contains 128 lamp beads; the projection limiter group 2" is provided with 128 rows of projection limiters, the projection limiters are in the shape of trapezoidal grooves, that is, the cross section S" of the projection limiters is trapezoidal, the bottom of the trapezoidal groove is located at the upper bottom side (short side) of the trapezoid, the lamp beads are located in the trapezoidal grooves, so that the light of the lamp beads is projected from the notch of the trapezoidal grooves; The core of this embodiment is that the bisectors of the two angles of the trapezoidal groove cross section S" passing through the LED lamp beads in the same group of projection limiting parts intersect at a point D", so as to achieve a visual effect that the light of the same group of projection limiting parts is projected from the same virtual pixel point D"; the trajectory of D" corresponding to a row of LED lamp beads rotating around the rotation axis O" in the projection limiting part is a circle U", so the virtual screen of this embodiment is a cylindrical surface with U" as the cross-section.

[0057] The LED lamp beads with an angle range of 0-180° between the lateral component of the projection direction of each group of limited projection parts and the imaging surface are used for imaging of the virtual pixel points, and the LED lamp beads with an angle range of 180-360° are used for supplementary imaging of the pixel points in front.

[0058] In this embodiment, the two groups of projection limiting parts can be symmetrically arranged to reduce the requirement for refresh rate, or can be arranged to fill the blank spaces in the observation areas of adjacent projection limiting parts when passing the same point.

[0059] like Fig. 9 As shown, multiple holographic imaging devices of Examples 1-5 can be spliced ​​together; a non-observation surface (such as the back) of the holographic imaging device of Examples 1-5 (the pixel projection direction limiting barrel and the hollowed-out middle part of the imaging barrel screen) can be provided with a reflector, and when the light source such as the LED is rotated to the back of the device, it is transmitted to the observable surface through the reflector, so as to make full use of hardware resources to improve the resolution and / or display frame number and / or viewing angle, etc.

[0060] In the holographic imaging device of Embodiments 1-4, the number of projection limiting parts and the number of light sources may be different. Example 6

[0061] like Figure 10-12 A holographic imaging device shown in the figure comprises more than two plane rotating light fan devices, wherein the plane rotating light fan device is provided with a rotating base 1 and more than one light fan 2, wherein the light fan 2 is installed on the rotating base 1; the length of the light fan is ≥ the diameter of the rotating base; the lamp bead or unit display area of ​​the light fan is provided with a rotatable projection limiting part, a metal block is provided at one end of the projection limiting part, and a magnetic attraction device 3 (such as a permanent magnet) is provided on one side (such as the top) of the plane rotating light fan device, so that the end with the metal block always points to the same direction, so as to ensure that the projection limiting part only limits the visible angle of the lamp bead or the display screen in the horizontal direction and is visible in the vertical direction.

[0062] There are at least two planar rotating light fan devices symmetrically arranged with non-parallel rotation axes. The light fan of one planar rotating light fan device can pass over the base of the other, so that the imaging surfaces 4 of the two planar rotating light fan devices can cover the base of the other.

[0063] The multiple planar rotating light fan devices of this embodiment can form an arc surface or multiple planes to enclose a space.

[0064] The holographic imaging devices of Examples 1-6 can be spliced ​​together in multiple units of one type or multiple units of multiple types, so that the total imaging screen forms an enclosed space such as more than one arc surface or multiple planes.

Claims

1. A holographic imaging method, characterized in that: The holographic imaging method uses a light source group or display screen of more than one imaging device to play a dynamic video or static picture of 3D modeling; the imaging surface of the imaging device includes N1, N2...Nm...Nn, with a total of n pixels; the imaging device is provided with more than one group of limiting projection parts that limit the directional projection of the light source group or the display screen, and one group of limiting projection parts is provided with more than two limiting projection parts; the holographic imaging method comprises the following steps: 1.1 Make the projection limiter group move, and through the projection limiters in the same projection limiter group, one end projects one or more light sources on the same pixel point or unit imaging area successively or simultaneously, and the other end projects in a horizontal direction, and there are at least two projection limiters whose one end projects on the pixel point or unit imaging area, and the other end projects in a different horizontal direction; 1.2 During the movement of the projection limiting unit, the movement path of the projection limiting unit does not take the corresponding pixel point as the center of the circle or the center of the sphere, so that the imaging surface of the imaging device plays video content or picture content at different angles in more than two projection directions within one frame period.

2. A holographic imaging method according to claim 1, characterized in that: The unit imaging area in step 1.2 is the area between the previous pixel and the next pixel in the same column of the pixel, and / or the area between the previous pixel and the next pixel in the same row of the pixel; the control method for the projection limiting unit to realize the imaging surface of the imaging device to play pictures of different angles in more than two projection directions within one frame period is: 2.1 Establishing the imaging surface position: the reverse extension surface of the projection limiting part in the same projection limiting part group or the intersection line, intersection point or overlapping area of ​​the reverse extension line is established as a unit imaging area, and the collection of the unit imaging areas is established as an imaging surface; 2.2 The pixel point Nm passes through a point P where the reverse extension line of a projection direction in the projection limit part intersects with the modeling surface. Then the pixel point Nm emits the image of point P in the projection direction. Or if a row of pixel points passes through a line L in which a reverse extension of the projection direction in the projection limiting portion intersects the modeling surface, then the row of pixel points is the image of the line L in the projection direction.

3. A holographic imaging method according to claim 1, characterized in that: In step 1.1, the light source projects light through the projection limiting portion in a divergent and directionally projected transversely, and a divergence angle c in the transverse direction is less than 10 degrees.

4. A holographic imaging method according to claim 1, characterized in that: Step 1.1 is further defined as one or more light sources passing through a pixel are directed through a projection limiting portion in the form of a four-pyramid light beam.

5. A holographic imaging method according to claim 1, characterized in that: When the projection limiting part in step 1.2 moves in the form of rotation, the light source group or the display screen of the imaging device rotates synchronously or asynchronously.

6. A holographic imaging method according to claim 1, characterized in that: The following steps are also included: 1.3 At least two imaging devices are arranged on the imaging platform so that the imaging surface of the imaging platform forms an enclosed space.

7. A holographic imaging device using the holographic imaging method according to claim 1, characterized in that: The holographic imaging device comprises an imaging light group or a display screen, a pixel multi-directional projection part and a driving device; the driving device drives the connected pixel multi-directional projection part and causes the pixel multi-directional projection part to move; the pixel multi-directional projection part is provided with more than one projection limiter group, and the projection limiter group is provided with more than three projection limiters; one end of the projection limiter faces the imaging light group or the display screen, and the imaging light of the imaging light group or the point on the display screen is projected toward the other end of the projection limiter; In the same group of projection limiting parts, there are at least three projection limiting parts whose reverse extension surfaces intersect on the same straight line or whose reverse extension lines intersect at one point or the same unit imaging area; or During the movement, in the same group of limiting throwing parts, there are at least three limiting throwing parts whose reverse extension surfaces intersect at the same straight line or their reverse extension lines intersect at one point when they pass through the same position successively.

8. A holographic imaging device as claimed in claim 7, characterized in that: The limiting unit group is provided with n columns of limiting units, wherein Let the angle between the projection direction of the mth column and the tangent line L2 of its motion trajectory L1 be a m ; The included angle between the projection directions of the mth column and the m-1th column that pass through the same point successively is b m ; The angle between the projection direction of the projection limiter in the m-1th column and the tangent of its motion trajectory is a m-1 ; The divergence angle of the limited projection part of the mth column is c m , then a m =b m +a m-1 , a n -a1= =c1+c2+...c m +...c n 。 9. A holographic imaging device as claimed in claim 8, characterized in that: The divergence angles of the n columns of the limiting parts in the limiting part group are all the same, and there is c m =( ) / n。 10. A holographic imaging device as claimed in claim 7, 8 or 9, characterized in that: The number of groups of limiting projection parts of the pixel multi-directional projection part is smaller than the number or columns of limiting projection parts contained in the limiting projection part group, so that the number of distinguishable viewing angles of a unit imaging area on the imaging light or screen through the limiting projection part in horizontal projection is greater than the number of distinguishable viewing angles in vertical projection.

Images