CN103281507A - Videophone system and videophone method based on true three-dimensional display - Google Patents
Videophone system and videophone method based on true three-dimensional display Download PDFInfo
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Abstract
The invention relates to a videophone system and a videophone method based on true three-dimensional display. The system comprises a first camera, a second camera, a horizontal polarizing film, a polarizing reflector plate, a stereopsis image projector, a projector, a first computer, a second computer, a longitudinal polarizing film, a reflector, a turntable, a diffuse reflection screen, a protective bracket, a USB (Universal Serial Bus) hub, three USB lines, a communication line, an HDMI (High Definition Multimedia Interface) video line, an infrared light source and an infrared filter. The method comprises the following steps of collecting video signals by a three-dimensional image acquisition subsystem, calculating and converting the video signals into a three-dimensional face model by the computers, and transmitting the three-dimensional face model to another videophone system by a communication network to carry out three-dimensional imaging. The system and the method have the advantages of low cost, easiness in realization, reliability in running, high stability and strong stereopsis sense for naked eyes.
Description
Technical field
The present invention relates to 3 D stereo video-phone system and method, be specifically related to a kind of video-phone system based on true three-dimensional display and method, belong to 3-D view and obtain and the Display Technique field.
Background technology
The objective world is the solid space that has three-dimensional dimension.Since display device was born, in order to reproduce the objective world truly, people never were interrupted the research for stereo display technique.So-called stereo display refers to show picture depth (third dimension) effect, just as we see real world, is three-dimensional.Stereo display technique can be divided into bore hole stereo display technique and non-bore hole stereo display technique by the angle of whether adding anaglyph spectacles.
Present nakedly look stereo display technique comprises mainly that hologram three-dimensional shows, body Display Technique and free stereo show three kinds.Hologram three-dimensional shows manages the light wave of the getable object of reconstruct eyes, even if make object also can not see the reflection true to nature of this object in the original place, the greatest problem that exists is that the 3 d light fields information playback is comparatively complicated at present, inconvenient large-area applications.Second kind is that the body Display Technique is true dimension display technologies, and it encourages the medium that shows in the body to produce visible radiation organizator pixel by suitable mode, and these are dispersed in three-dimensional volumetric pixel and have constituted stereo-picture.The image of body three-dimensional display is present in the true three-dimension space, show one near the stereoscopic picture plane of real-world object, meet the sense of reality that people observe world's scene, satisfy all physiology and psychological depth cueing, can allow many people, multi-angle, bore hole to watch scene simultaneously, need not any auxiliary eyeglasses, than other the two kinds naked stereo display techniques of looking, more close to the target of ultimate demonstration, but because the display unit accompany movement, its display space is less.The third is free 3 D display technology, uses materials such as post lens, lenticule to cover flat-panel screens the place ahead usually, and an original width of cloth 3-D view is resolved into several two dimensional image that is mutually related, and forms stereoscopic vision by binocular parallax.The defective of this method is the contradiction between vision area and the resolution, resolution is big, vision area is just wide, but resolution can not promote significantly at present, and this has just limited the expansion of vision area range, ophthalmic uncomfortable when causing observing, spectators' 30 degree of can just breaking a promise in screen the place ahead are watched parallax stereopsis preferably, three-dimensional vision area is less than 48, and effectively viewpoint is less than 42, can hold ten spectators at most and watch simultaneously.
At home, the generally employing of 3 D visible telephone system helps looks three-dimensional display, and the user wears polarization type or fast gate-type eyes are realized stereoscopic vision, yet the dialogue both sides will see the telephone subscriber who wears solid mutually.The video-phone system based on auto-stereoscopic display that Shanghai University designs and produces, though need not to wear three-dimensional eyes, the stereo data amount that 8 viewpoints are taken is big, to the requirement height of communication network bandwidth, is difficult on the market and popularizes.
Though such scheme all can have been realized 3 D visible communication, all there is the deficiency of stereoeffect and communication bandwidth.They are based on plane picture, and stereopsis district resolution is low, perspective view is little, the stereo data amount is big.
Summary of the invention
The problem and shortage of the existence of prior art the purpose of this invention is to provide a kind of video-phone system based on true three-dimensional display and method in view of the above, realizes that true three-dimensional display communicates by letter with visual three-dimensional.
The present invention realizes by the following technical solutions:
A kind of video-phone system based on true three-dimensional display, comprise first video camera, second video camera, the cross-polarization sheet, the reflection of polarization sheet, stereopsis projector, projector, first computer, second computer, vertical polarizer, speculum, turntable, the diffuse reflection screen, protective cradle, usb hub, article three, USB line, order wire, the HDMI video line, infrared light supply, infrared filter, first video camera that is used for the pinup picture IMAQ is taken people's face by cross-polarization sheet and reflection of polarization sheet, its mirror point is positioned at the eye position of virtual three-dimensional image, the projector that is used for the structured light generation obtains the second camera alignment people face and is connected computer by the USB line with usb hub with structured light, computer connects stereopsis projector by the HDMI video line, described diffuse reflection screen is vertically fixed on the turntable, and turntable is fixed on the protective cradle; Described vertical polarizer is positioned at the dead ahead of stereopsis projector, and the tilting vertical polarizer the place ahead that is positioned at of described speculum makes the projection illumination of stereopsis projector on the diffuse reflection screen; Described infrared light supply is positioned at projector inside, and infrared filter is positioned at the second video camera dead ahead.
A kind of video telephone method based on true three-dimensional display adopts above-mentioned imaging system to carry out imaging operation, and operating procedure is as follows:
1) the true three-dimensional face model based on the projection structure optical scanning generates, and step is:
A structured light system calibrating: position and the angular relationship of determining infrared structure light projector and video camera, set up the perspective projection model of structured light system, input space coordinate points, physical coordinates and camera review coordinate are carried out match, set up the demarcation mapping table of image coordinate and physical coordinates;
B sets up the binary-coding pattern: two-value sign indicating number pattern increases with 2 multiple with m pattern 2m the striped (m is natural number) of encoding, the fringe number of adjacent patterns, and in the maximum pattern of fringe number, all pixels that belong to identical striped have identical code word;
C three-dimensional face point cloud method for reconstructing: projection binary-coding pattern, behind the visible light filter, video camera obtains original infrared image, after background filtering, binaryzation, geometric correction, resolution coupling, obtain single frames structured light projection image, by demarcating mapping table reconstruction of three-dimensional people face point cloud;
D is based on faceform's chart pasting method of virtual visual point image: take the positive color image of people's face based on the video camera of virtual view, after filling through a some cloud location matches, color, realize the colored pinup picture of faceform.
2) be the unit with the body frame, by the time sequence with three-dimensional point cloud and pinup picture transfer of data to far-end computer, far-end stereopsis projector projection coding image and by the imaging of diffuse reflection screen;
3) use extensive on-site programmable gate array FPGA and big capacity synchronous DRAM DDRRAM as the core of projecting cell, to DMD driver module transmission 3-D view.
In the described video telephone method based on true three-dimensional display, the vertical polarised light of reflection of polarization sheet transmission and reflection cross-polarization light, the video camera of pinup picture IMAQ is taken people's face by cross-polarization sheet and the 504F reflector plate that shakes, do not disturb mutually with vertical polarised light of stereopsis projector, the video camera mirror point is positioned at the eye position of virtual three-dimensional image, to seeing people's face 3-dimensional image by actual eye position.
In the described video telephone method based on true three-dimensional display, FPGA and DDRRAM are as the core of stereopsis projector, and FPGA obtains frame of video by the HDMI video line, and real-time decoding is isolated each angle subframe, realizes true tripleplane.
In the described video telephone method based on true three-dimensional display, arm processor is as the core of video camera, and ARM obtains the original image that CMOS exports by the FIFO memory, realizes the reconstruction of infrared image after abandoning chrominance signal and obtaining image brightness signal.
Compared with prior art, the present invention has following outstanding substantive distinguishing features and advantage significantly:
The present invention compares with the multi-view auto 3 D visible phone that adopts 8 to 9 video cameras to take synchronously, uses 2 camera rebuilding 3-dimensional image models, and model data is little, is convenient to compression and communicates by letter.The present invention adopts true three-dimensional display terminal, and third dimension is genuine and believable, and visible angle is not limit, and phenomenons such as ghost image and dizziness do not occur.Cost of the present invention is lower, realization is easy, reliable, stability is high.
Description of drawings
Fig. 1 is based on the video-phone system schematic diagram of true three-dimensional display.
Fig. 2 projector cut-away view.
Fig. 3 structured light system calibrating structure chart.
Fig. 4 structured light system calibrating flow chart.
Fig. 5 binary-coding pattern.
Fig. 6 three-dimensional face point cloud algorithm for reconstructing flow process.
The true said three-dimensional body frame of Fig. 7 code pattern.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described below:
Embodiment one:
With reference to Fig. 1, a kind of video-phone system based on true three-dimensional display, comprise first video camera 9, second video camera 17, cross-polarization sheet 7, reflection of polarization sheet 6, stereopsis projector 1, projector 8, first computer 18, second computer 23, vertical polarizer 19, speculum 2, turntable 4, diffuse reflection screen 5, protective cradle 3, usb hub 14, article three, USB line 15, order wire 16, HDMI video line 20, infrared light supply 21, infrared filter 22, first video camera 9 that is used for the pinup picture IMAQ is taken people's face 10 by cross-polarization sheet 7 and reflection of polarization sheet 6, its mirror point is positioned at the eye position of virtual three-dimensional image 11, the projector 8 that is used for the structured light generation obtains second video camera 17 with structured light and aims at people's faces 10 and be connected computer 18 by USB line 15 with usb hub 14, computer 18 connects stereopsis projector 1 by HDMI video line 20, described diffuse reflection screen 5 is vertically fixed on the turntable 4, and turntable 4 is fixed on the protective cradle 3; Described vertical polarizer 19 is positioned at the dead ahead of stereopsis projector 1, and described speculum 2 tilting vertical polarizer 19 the place aheads that are positioned at make the projection illumination of stereopsis projector 1 on diffuse reflection screen 5; Described infrared light supply 21 is positioned at projector 8 inside, and infrared filter 22 is positioned at second video camera, 17 dead aheads.
One cover three-dimensional reconstruction subsystem:
Adopted a projector 8 and second video camera 17 in the three-dimensional reconstruction subsystem, be connected on the computer 18 by USB line 15, the vision signal that collects converts digital of digital video data to via image pick-up card, and processing speed can reach for 25 frame/seconds.
The true three-dimensional imaging subsystem of one cover
With reference to Fig. 2, stereopsis projector 1 inner 0.95 DMD (Digital Mirror Device, the Digital Micromirror Device) wafer that adopts, resolution reaches 1920*1080, and the mirror elemental size is 10.8um.Stereopsis projector 1 comprises complete communication interface, is used for data presented by HDMI video line 20 to the data processing module transmission in the stereopsis projector 1; Data processing module comprises a slice FPGA and DD2DRRAM, and FPGA is used for the real tri-dimension data of transmission are decoded, for afterwards level DMD sequential and reset circuit provide signal; The DD2DRRAM of 4G capacity provides storage for true 3-dimensional image file; DMD resets and sequence circuit comprises DAD2000 reset drives, DDC4100 controller, finishes resetting and controlling of DMD wafer; The DAD2000 reset drives provides reset signal and high-voltage signal for DMD.Stereopsis projector 1 also comprises FPGA debugging interface, DMD connector, GPIO (General Purpose Input Output, general input and output) connector, battery, power supply, power connector, inside modules working power.
Native system diffuse reflection screen 5 is vertically fixed on the turntable 4, and turntable 4 is fixed on the protective cradle 3.
Described vertical polarizer 19 is positioned at the dead ahead of stereopsis projector 1; Described speculum 2 tilting vertical polarizer 19 the place aheads that are positioned at make the projection illumination of stereopsis projector 1 on diffuse reflection screen 5, realize stereopsis and separating that viewpoint is taken by polarizer.
Embodiment two:
Referring to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, this adopts above-mentioned video-phone system to operate based on the video-phone system method of true three-dimensional display, and operating procedure is as follows:
True three-dimensional face model based on the projection structure optical scanning generates, and step is:
A structured light system calibrating: position and the angular relationship of determining infrared structure light projector 8 and video camera 17, set up the perspective projection model of structured light system, input space coordinate points, physical coordinates and camera review coordinate are carried out match, set up the demarcation mapping table of image coordinate and physical coordinates;
B sets up the binary-coding pattern: two-value sign indicating number pattern increases with 2 multiple with m pattern 2m the striped of encoding, the fringe number of adjacent patterns, and in the maximum pattern of fringe number, all pixels that belong to identical striped have identical code word;
C three-dimensional face point cloud method for reconstructing: projection binary-coding pattern, behind infrared filter 22, video camera 17 obtains original infrared image, after background filtering, binaryzation, geometric correction, resolution coupling, obtain single frames structured light projection image, by demarcating mapping table reconstruction of three-dimensional people face point cloud;
D is based on faceform's chart pasting method of virtual visual point image: take the positive color image of people's faces based on first video camera 9 of virtual view, after filling through a some cloud location matches, color, realize the colored pinup picture of faceform.
Be the unit with the body frame, by the time sequence with three-dimensional point cloud and pinup picture transfer of data to far-end computer, far-end stereopsis projector projection coding image and by the imaging of diffuse reflection screen;
Use extensive on-site programmable gate array FPGA and big capacity synchronous DRAM DDRRAM as the core of projecting cell, to DMD driver module transmission 3-D view.
The described vertical polarised light of reflection of polarization sheet 6 transmissions and reflection cross-polarization light, second video camera 22 of pinup picture IMAQ is taken people's face by cross-polarization sheet 7 and reflection of polarization sheet 6, do not disturb mutually with vertical polarised light of stereopsis projector 1, first video camera, 9 mirror points are positioned at the eye position of virtual three-dimensional image, to seeing people's face 3-dimensional image by actual eye position.
FPGA and DDRRAM are as the core of stereopsis projector, and FPGA obtains frame of video by the HDMI video line, and real-time decoding is isolated each angle subframe, realizes true tripleplane.
Arm processor is as the core of video camera, and ARM obtains the original image that CMOS exports by the FIFO memory, realizes the reconstruction of infrared image after abandoning chrominance signal and obtaining image brightness signal.
Below technical scheme of the present invention is done principle explanation in detail:
A kind of structured light system calibrating method based on ray trace, structure chart as shown in Figure 3, flow process is specially as shown in Figure 4:
The optical plane of projector projection and model intersect and form a bright outline line, and outline line obtains series of points after by preliminary treatment, and they can try to achieve the coordinate figure of physical space by the ray trace method.Projector lens is centered close under the camera lens center, and distance is between them
For the optical center and with reference to the distance between curtain wall.
The vertical range of locating each projected light plane and x axle is
The resolution of projector is
,
Scope be
,
Be line number,
Be the projected picture height.The optic plane equations that projector projects can by
,
,
Determine.Optical plane is through point
,
,
Be orientation vector, the plane equation of 600 projection plane correspondences is as follows:
The projection plane equation of CCD emergent ray:
Depth information based on optical plane and the acquisition of ray trace method can be by resolution of video camera, video camera cone of sight, camera lens inclined light shaft angle
, video camera and linear laser source distance
, light-plane parameters
, the imager coordinate of spatial point on CCD
Determine.
A kind of binary-coding pattern method, coding pattern is specially as shown in Figure 5:
The two-value sign indicating number increases with 2 multiple with m pattern 2m the striped of encoding, the fringe number of adjacent patterns.In the maximum pattern of fringe number, all pixels that belong to identical striped have identical code word.Code word is 0 and 1 the sequence that is obtained by m pattern, and 0 corresponding to black, and 1 corresponding to white.
A kind of true three-dimensional face point cloud method for reconstructing based on region growing, flow process is specially as shown in Figure 6:
The infrared light irradiation is taken the structure light coding image that obtains down, after background filtering, binaryzation, geometric correction, resolution matching treatment, obtain a frame projected image; Rebuilding by the true three-dimensional face point cloud that carries out single body frame after demarcating the mapping table inquiry, namely obtain people's face point cloud.Realize faceform's three-dimensional reconstruction behind the colored pinup picture through triangular network expansion and tri patch.
In the triangle gridding expansion process, same time memory candidate's triangle scale can reach 100,000 even 1,000,000 grades, for region growing each time, all need from a large amount of candidate's triangular plates, to select an optimum triangular sheet growth.True three-dimensional face point cloud method for reconstructing based on region growing is introduced binary sort tree, to solve the traversal problem of searching of candidate's triangular plate formation.
Triangular plate in the known spatial, three corresponding limits are respectively
,
,
, minimum circumsphere radius
Be calculated as follows:
With
As node priority, for binary sort tree is set up in the formation of candidate's triangular plate.In initialization seed triangular plate process, choose first candidate's triangular plate as root root, remaining be inserted into two again in the ordering tree according to priority rule left small and right large.New candidate's triangular plate that each growth produces all is inserted in the tree.
A kind of true said three-dimensional body frame coding method based on dithering process, coding result is specially as shown in Figure 7:
Employing is based on the dither algorithm of error diffusion.At first set up the screening sign, press 128 as the screening threshold value, carry out error and keep:
To the right 7/16 of propagated error, downwards 5/16 of propagated error, to 1/16 of bottom right propagated error, to left down 3/16 of propagated error:
(5)
Obtain viewpoint accumulative total figure
:
Pressing computer can gray-scale displayed value mapping viewpoint accumulative total scheme, and obtains true said three-dimensional body frame code pattern
:
True three-dimansioual display adopts the diffuse reflection screen as the carrier of space pixel, and screen has the angle of visibility of 180 degree.One week of Rotation screen produces a static body frame, and the screen per second rotated for 25 weeks, realizes that the real-time three-dimensional of user people's face shows.
Claims (4)
1. video-phone system based on true three-dimensional display, comprise first video camera (9), second video camera (17), cross-polarization sheet (7), reflection of polarization sheet (6), stereopsis projector (1), projector (8), first computer (18), second computer (23), vertical polarizer (19), speculum (2), turntable (4), diffuse reflection screen (5), protective cradle (3), usb hub (14), article three, USB line (15), order wire (16), HDMI video line (20), infrared light supply (21), infrared filter (22), it is characterized in that, first video camera (9) that is used for the pinup picture IMAQ is taken people's face (10) by cross-polarization sheet (7) and reflection of polarization sheet (6), its mirror point is positioned at the eye position of virtual three-dimensional image (11), the projector (8) that is used for the structured light generation obtains second video camera (17) with structured light and aims at people's face (10) and be connected computer (18) by USB line (15) with usb hub (14), computer (18) connects stereopsis projector (1) by HDMI video line (20), described diffuse reflection screen (5) is vertically fixed on the turntable (4), and turntable (4) is fixed on the protective cradle (3); Described vertical polarizer (19) is positioned at the dead ahead of stereopsis projector (1), and tilting vertical polarizer (19) the place ahead that is positioned at of described speculum (2) makes the projection illumination of stereopsis projector (1) on diffuse reflection screen (5); Described infrared light supply (21) is positioned at projector (8) inside, and infrared filter (22) is positioned at second video camera (17) dead ahead.
2. the method based on the video telephone of true three-dimensional display adopts a kind of video-phone system based on true three-dimensional display according to claim 1 to take and imaging operation, it is characterized in that operating procedure is as follows:
1) the true three-dimensional face model based on the projection structure optical scanning generates, and step is:
A structured light system calibrating: position and the angular relationship of determining infrared structure light projector and video camera, set up the perspective projection model of structured light system, input space coordinate points, physical coordinates and camera review coordinate are carried out match, set up the demarcation mapping table of image coordinate and physical coordinates;
B sets up the binary-coding pattern: two-value sign indicating number pattern is with m pattern 2m the striped of encoding, and m is natural number, and the fringe number of adjacent patterns increases with 2 multiple, and in the maximum pattern of fringe number, all pixels that belong to identical striped have identical code word;
C three-dimensional face point cloud method for reconstructing: projection binary-coding pattern, behind the visible light filter, video camera obtains original infrared image, after background filtering, binaryzation, geometric correction, resolution coupling, obtain single frames structured light projection image, by demarcating mapping table reconstruction of three-dimensional people face point cloud;
D is based on faceform's chart pasting method of virtual visual point image: take the positive color image of people's face based on the video camera of virtual view, after filling through a some cloud location matches, color, realize the colored pinup picture of faceform.
2) be the unit with the body frame, by the time sequence with three-dimensional point cloud and pinup picture transfer of data to far-end computer, far-end stereopsis projector projection coding image and by the imaging of diffuse reflection screen;
3) use extensive on-site programmable gate array FPGA and big capacity synchronous DRAM DDRRAM as the core of projecting cell, to DMD driver module transmission 3-D view.
3. the video telephone method based on true three-dimensional display according to claim 2, it is characterized in that, the vertical polarised light of described reflection of polarization sheet transmission and reflection cross-polarization light, the video camera of pinup picture IMAQ is taken people's face by cross-polarization sheet and reflection of polarization sheet, do not disturb mutually with vertical polarised light of stereopsis projector, the video camera mirror point is positioned at the eye position of virtual three-dimensional image, to seeing people's face 3-dimensional image by actual eye position.
4. the video telephone method based on true three-dimensional display according to claim 2, it is characterized in that, adopt arm processor as the core of video camera, ARM obtains the original image that CMOS exports by the FIFO memory, realizes the reconstruction of infrared image after abandoning chrominance signal and obtaining image brightness signal.
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| CN107622526A (en) * | 2017-10-19 | 2018-01-23 | 张津瑞 | A kind of method that 3-D scanning modeling is carried out based on mobile phone facial recognition component |
| CN108985172A (en) * | 2018-06-15 | 2018-12-11 | 北京七鑫易维信息技术有限公司 | A kind of Eye-controlling focus method, apparatus, equipment and storage medium based on structure light |
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| CN108921102B (en) * | 2018-07-05 | 2022-07-05 | 盎锐（上海）信息科技有限公司 | 3D image processing method and device |
| CN111063016A (en) * | 2019-12-31 | 2020-04-24 | 螳螂慧视科技有限公司 | Multi-depth lens face modeling method and system, storage medium and terminal |
| CN113763545A (en) * | 2021-09-22 | 2021-12-07 | 拉扎斯网络科技（上海）有限公司 | Image determination method, image determination device, electronic equipment and computer-readable storage medium |
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