CN114449246A - Dynamic multi-view stereo image method for cylindrical display - Google Patents
Dynamic multi-view stereo image method for cylindrical display Download PDFInfo
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- 238000009877 rendering Methods 0.000 claims abstract description 11
- 238000013507 mapping Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/111—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation
- H04N13/117—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation the virtual viewpoint locations being selected by the viewers or determined by viewer tracking
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/122—Improving the 3D impression of stereoscopic images by modifying image signal contents, e.g. by filtering or adding monoscopic depth cues
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/189—Recording image signals; Reproducing recorded image signals
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Abstract
The invention discloses a dynamic multi-view stereo image method of a cylindrical display, which comprises the following steps: step one, a GPU assembly line of dynamic viewpoint mapping is used for realizing cylindrical stereoscopic display; and step two, realizing multi-user multi-view stereoscopic display by using high-brushing-resolution images and refreshing control shutter glasses. The method projects a stereo image onto a cylindrical display through a curved surface viewpoint, so that the cylindrical display dynamically generates a correctly perspective picture according to the viewpoint, when a plurality of users use the method, the images of the users can be controlled according to the refreshing of the display, so that each user can only see the correct image belonging to the viewpoint of the user, and multi-user multi-viewpoint holographic viewing is realized. The invention greatly accelerates the rendering efficiency of the 3D scene on the cylinder by utilizing the CG program, generates images of respective viewpoints by a dynamic viewpoint technology and provides technical possibility for the subsequent multi-viewpoint multi-buffer images.
Description
Technical Field
The invention relates to a dynamic multi-view stereoscopic image method for a cylindrical display.
Background
The current cylindrical display is mainly formed by a closed circular channel after a bent layout is performed on an LED screen, and the display mode of the current cylindrical display is a scroll display mode, that is, a frame picture is mapped onto an unfolded cylindrical plane through 2D. Although a wide viewing angle can be provided, there is no stereoscopic effect.
Viewpoint perspective correction techniques typically use off-axis perspective to render a 3D scene based on the position of the viewer relative to the display screen, so that a stereoscopic object appears on the screen to the viewer. As the viewer moves, the effect of different angles of the object is observed. The perspective correction technology can only be applied to regular rectangular screens, but cannot be applied to irregular screens.
The multi-view display technology generally satisfies the requirement that a plurality of observers see pictures belonging to own visual angles of the observers on a screen, and different visual lines are mapped to different element images when passing through a grating through a column grating technology and an element image display technology, so that different effects of multi-view watching are formed. This technique requires either a display with sufficient resolution or multiple projectors to achieve, low effective resolution and blurred images.
The holographic display technology mainly comprises technologies such as holographic imaging based on Fresnel effect, air imaging and real laser holographic imaging, and suspended images are presented in space. The two images are not viewed at any visual angle, and the laser holographic imaging technology has high power and high cost and cannot realize full-color display.
Disclosure of Invention
The invention aims to provide a method for projecting a stereoscopic image on a cylindrical display by a dynamic multi-view point of the cylindrical display, which projects the stereoscopic image on the cylindrical display by a curved view point, so that the cylindrical display dynamically generates a correctly perspective picture according to the view point, and when a plurality of users use the method, the images of the users can be controlled according to the refreshing of the display, so that each user can only see the correct image belonging to the view point of the user, and multi-user multi-view point holographic viewing is realized.
The purpose of the invention is realized by the following technical scheme:
a dynamic multi-view stereo image method of a cylindrical display comprises the following steps:
the method comprises the following steps of firstly, realizing cylindrical stereoscopic display by using a GPU pipeline of dynamic viewpoint mapping, and specifically comprising the following steps:
(1) obtaining views by a viewpoint tracking deviceViewpoint positions of the observers: p1、P2、P3、P4、······、PnN is the number of observers;
(2) converting the viewpoint position into local coordinates in a three-dimensional space of a cylindrical three-dimensional display: cP1、CP2、CP3、CP4、······、CPn；
(3) The method comprises the steps of unfolding a cylindrical stereoscopic display to obtain a 2D pixel plane, and calculating 3D information D of a 3D cylindrical surface point corresponding to each 2D pixel by using a spherical interpolation method1And storing the data in a polar coordinate mode, wherein the cylindrical stereoscopic display is developed in the following mode:
take point (x, Y, z) on a cylinder as an example, where Y is the vertical direction, the resolution of the cylinder is (W, H), and the 2D space is0UV, 0 < U < W, 0 < V < W, then the transformed (U, V) coordinates are:
u＝W*artan(x,y)/360；
v＝(z-0.5*H)/H；
(4) converting the 3D vertex of the surface of the 3D rendering object into the local coordinate of the three-dimensional space of the cylinder to obtain data D3D sceneCaching;
(5) in the GPU, respective viewpoints C in polar coordinates are usedP1、CP2、CP3、CP4、······、CPnRespectively calculate D3D sceneProjected picture I1、I2、I3、I4、······、InAnd according to D1The individual frames are transformed into the 2D pixel plane by polar coordinates, wherein D is calculated3D scenesThe method for projecting the picture comprises the following steps: firstly, projecting by using vertex information of the unfolded cylindrical surface, and then using viewpoint information and D3D sceneCaching pixel colors of the index projection picture;
step two, realizing multi-user multi-view stereoscopic display by using high-brushing-resolution images and refreshing control shutter glasses, and specifically comprising the following steps:
(1) will project picture I1、I2、I3、I4、······、InInputting the data into a buffer area of a GPU;
(2) setting a refreshing time sequence of shutter type stereo glasses of each observer;
(3) GPU (graphic processing Unit) will project picture I1、I2、I3、I4、······、InOutputting the data to a screen according to a refreshing time sequence;
(4) shutter type stereoscopic glasses according to I1、I2、I3、I4、······、InThe time sequence of the first time sequence is sequentially opened or closed;
(5) each observer observes the image of his own viewpoint in turn, and when the refresh rate is high enough (the minimum refresh rate required by human eyes is 30Hz, and the minimum refresh rate requirement should be equal to 30Hz multiplied by the number of observers), a stable stereoscopic picture can be obtained.
Compared with the prior art, the invention has the following advantages:
1. the invention greatly accelerates the rendering efficiency of the 3D scene on the cylinder by utilizing the CG program, generates images of respective viewpoints by a dynamic viewpoint technology and provides technical possibility for the subsequent multi-viewpoint multi-buffer images.
2. The invention can meet the requirement of watching multiple people from multiple viewpoints on the cylindrical display with high refresh rate and high resolution, so that multiple people can perform cooperative operation from different angles and positions in the same 3D scene. Taking a 240Hz display as an example, when the refresh of each person is set at 120Hz, 2 persons can be interacted simultaneously, and when the refresh is set at 60Hz, 4 persons can be interacted, and in the future, more persons can be interacted by region segmentation and a high-resolution image mosaic mode.
Drawings
FIG. 1 is a plan expanded view of a cylindrical display;
FIG. 2 is a rendering pipeline facing a cylindrical display;
FIG. 3 is a sample project implemented using unity;
FIG. 4 is an image viewed from a first viewpoint;
fig. 5 is an image viewed from another viewpoint.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The invention provides a dynamic multi-view stereo image method of a cylindrical display, which comprises the following steps:
step one, cylindrical stereoscopic display is achieved by using a GPU pipeline of dynamic viewpoint mapping.
The cylindrical display is a 2D rectangular pixel plane after being unfolded. If the 3D object is rendered directly according to the 2D pixel plane, after being displayed on the cylindrical display, the display effect is deformed. Therefore, the invention provides a new GPU pipeline rendering method, which can render a corrected 3D scene in a 2D pixel space in real time according to a dynamic viewpoint, and when a user watches a 3D object on a cylindrical display, the perspective effect can be really restored. Since the process is completed by using the CG program on the GPU, the 3D scene, the volume video and the multi-viewpoint image can be restored in real time, and an immersive watching effect is obtained. The basic rendering process is shown in fig. 2, and the specific steps are as follows:
(1) the positions of the viewpoints of the observers are obtained by a viewpoint tracking device (camera, optical motion capture, depth camera): p1、P2、P3、P4、······、PnN is the number of observers;
(2) converting the viewpoint position into local coordinates in a three-dimensional space of a cylindrical three-dimensional display: cP1、CP2、CP3、CP4、······、CPn；
(3) The cylindrical stereoscopic display is unfolded according to the mode in fig. 1, a 2D pixel plane is obtained, and 3D information D of the 3D cylindrical surface point corresponding to each 2D pixel is calculated1And storing according to a polar coordinate mode;
(4) will be provided withConverting 3D vertexes of the surface of the 3D rendering object into local coordinates of a cylindrical three-dimensional space to obtain data D3D sceneCaching;
(5) in the GPU, respective viewpoints C in polar coordinates are usedP1、CP2、CP3、CP4、······、CPnRespectively calculate D3D sceneProjected picture I1、I2、I3、I4、······、InAnd according to D1The individual pictures are transformed into the 2D pixel plane by polar coordinates.
The process is dynamically generated according to the observation viewpoint, and is different from the traditional parallel parallax three-dimensional display mode. The CG program will decide which area of the 2D pixel plane to render the image based on the viewing point. When the 2D pixel plane is curled into a cylinder, the viewer can obtain a stereoscopic effect of correct perspective.
And step two, realizing multi-user multi-view stereoscopic display by using high-brushing-resolution images and refreshing control shutter glasses.
In practical applications, different observers have different viewpoints, and in order to enable each observer to view a correct stereoscopic image, a method of multi-viewpoint stereoscopic display needs to be provided. The invention provides a method for storing images of different observers by using high-refresh-rate images, which realizes multi-user multi-view stereoscopic display effect by using multiple buffer areas of a GPU (graphics processing unit) and matching with active stereoscopic glasses. The method comprises the following specific steps:
(1) will project picture I1、I2、I3、I4、······、InInputting the data into a buffer area of a GPU;
(2) setting a refreshing time sequence of shutter type stereo glasses of each observer;
(3) GPU (graphic processing Unit) will project picture I1、I2、I3、I4、······、InOutputting the data to a screen according to a refreshing time sequence;
(4) shutter type vertical shaftBody glasses according to I1、I2、I3、I4、······、InThe time sequence of the first time sequence is sequentially opened or closed;
(5) each observer observes the image of his own viewpoint in turn.
Taking the 240Hz refreshed display screen on the market at present as an example, four people watch the image I at the same time, so that the image I has four groups of view points1、I2、I3、I4And the four images are generated according to the rendering pipeline described in the first step, after the rendering is completed, the four images are stored in a multiple buffer area of the GPU and output to the screen, the display sequentially renders the four groups of images according to the sequence of the multiple buffer area and according to a time sequence, when the refresh rate is very high, the four groups of images appear on the cylindrical display at the same time, and the refresh rate of the image of each viewpoint can reach 60 Hz.
When watching images, four observers can wear shutter glasses G matched with self viewpoint image refreshing1、G2、G3、G4When the display is rendered at the current time is I1Other glasses can be in a closed state, and only G is1In an open display state; to the next time-sequential image I2，G2The open state, the other glasses are closed; and so on. When the scene is refreshed rapidly, each observer sees the correct perspective 3D scene from different angles, thereby realizing multi-user multi-view stereo viewing.
Example (b):
in this embodiment, a cylindrical display device with 1536 × 518 pixels, a circumference of 3840mm, a height of 1320mm is constructed by using a flexible LED screen, the refresh rate is 120Hz, and the hardware device for viewing is a geforce nvidia shutter type stereoscopic glasses. In this embodiment, the project is developed by using Unity, and a sample project implemented by using Unity is shown in fig. 3. The viewpoint tracking uses a Kinect to obtain the dynamic position of an observer, the 3D scene is cached in a cylindrical space in real time according to the dynamic position of the observer, 16bit 4K rendering target caching is used, viewpoint images of the observer are respectively generated by utilizing caching information, and the viewpoint images are sequentially stored in an image buffer area according to time sequence. When watching, the shutter type stereo glasses are manually modified, so that the opening and closing of the stereo glasses are performed according to the time sequence of an observer, not the time sequence of the left eye and the right eye, and thus the effect that two persons watch a stereo image on the cylindrical display at the same time can be obtained (as shown in fig. 4 and 5).
Claims (6)
1. A cylindrical display dynamic multi-view stereo image method is characterized by comprising the following steps:
step one, a GPU assembly line of dynamic viewpoint mapping is used for realizing cylindrical stereoscopic display;
and step two, realizing multi-user multi-view stereoscopic display by using high-brushing-resolution images and refreshing control shutter glasses.
2. The method for dynamic multi-view stereoscopic image of cylindrical display as claimed in claim 1, wherein the step one comprises the following steps:
(1) the viewpoint positions of the observers are obtained by the viewpoint tracking device: p1、P2、P3、P4、······、PnN is the number of observers;
(2) converting the viewpoint position into local coordinates in a three-dimensional space of a cylindrical three-dimensional display: cP1、CP2、CP3、CP4、······、CPn；
(3) The method comprises the steps of unfolding a cylindrical stereoscopic display, obtaining a 2D pixel plane, and calculating 3D information D of 3D cylindrical surface points corresponding to all 2D pixels1And storing the data according to a polar coordinate mode;
(4) converting the 3D vertex of the surface of the 3D rendering object into the local coordinate of the three-dimensional space of the cylinder to obtain data D3D sceneCaching;
(5) in the GPU, respective viewpoints C in polar coordinates are usedP1、CP2、CP3、CP4、······、CPnRespectively calculate D3D sceneProjected picture I1、I2、I3、I4、······、InAnd according to D1The individual pictures are transformed into the 2D pixel plane by polar coordinates.
3. The cylindrical display dynamic multi-view stereoscopic image method of claim 2, wherein in the (3), the 3D information D of the 3D cylinder surface points corresponding to the respective 2D pixels is calculated using a spherical interpolation method1。
4. The cylindrical display dynamic multi-view stereoscopic image method of claim 2, wherein in the (3), the cylindrical stereoscopic display is deployed as follows:
take point (x, Y, z) on a cylinder as an example, where Y is the vertical direction, the resolution of the cylinder is (W, H), and the 2D space is0UV, 0 < U < W, 0 < V < W, then the transformed (U, V) coordinates are:
u＝W*artan(x,y)/360；
v＝(z-0.5*H)/H。
5. the cylindrical display dynamic multi-view stereoscopic image method as claimed in claim 2, wherein in the (5), D is calculated3D sceneThe method for projecting the picture comprises the following steps: firstly, projecting by using vertex information of the unfolded cylindrical surface, and then using viewpoint information and D3D sceneThe buffer indexes the pixel colors of the projected picture.
6. The cylindrical display dynamic multi-view stereoscopic image method of claim 1, wherein the specific steps of the second step are as follows:
(1) will project picture I1、I2、I3、I4、······、InInputting the data into a buffer area of a GPU;
(2) setting a refreshing time sequence of shutter type stereo glasses of each observer;
(3) GPU (graphic processing Unit) will project picture I1、I2、I3、I4、······、InOutputting the data to a screen according to a refreshing time sequence;
(4) shutter type stereoscopic glasses according to1、I2、I3、I4、······、InThe time sequence of the switch is sequentially switched on or switched off;
(5) each observer observes the image of his own viewpoint in turn.
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| WO2017121361A1 (en) * | 2016-01-14 | 2017-07-20 | 深圳前海达闼云端智能科技有限公司 | Three-dimensional stereo display processing method and apparatus for curved two-dimensional screen |
| CN107333121A (en) * | 2017-06-27 | 2017-11-07 | 山东大学 | The immersion solid of moving view point renders optical projection system and its method on curve screens |
| KR20210049594A (en) * | 2019-10-25 | 2021-05-06 | 주식회사 케이티 | Three-dimensional image projection apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015092312A1 (en) * | 2013-12-20 | 2015-06-25 | Cortex Productions | Device for 360° active stereoscopic projection of relief images and method for implementing this device |
| CN105892217A (en) * | 2015-01-26 | 2016-08-24 | 北京英潮元吉科技有限公司 | Experience space integrated control system |
| WO2017121361A1 (en) * | 2016-01-14 | 2017-07-20 | 深圳前海达闼云端智能科技有限公司 | Three-dimensional stereo display processing method and apparatus for curved two-dimensional screen |
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