CN107065210A - A kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization and method - Google Patents
A kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization and method Download PDFInfo
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- CN107065210A CN107065210A CN201710263773.2A CN201710263773A CN107065210A CN 107065210 A CN107065210 A CN 107065210A CN 201710263773 A CN201710263773 A CN 201710263773A CN 107065210 A CN107065210 A CN 107065210A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
- G02B30/54—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels the 3D volume being generated by moving a 2D surface, e.g. by vibrating or rotating the 2D surface
Abstract
The invention belongs to body dimension display technologies field, and disclose a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization, including frame, microcontroller, the first servomotor, the first encoder, horizontal rotation support, the second servomotor, reflective gratings screen, host computer, projection arrangement and devating prism；Upward, the first encoder and horizontal rotation support are connected with the rotating shaft of first servomotor for the rotating shaft of first servomotor；Second servomotor is arranged on horizontal rotation support；The reflective gratings screen is installed in the rotating shaft of second servomotor.The present invention is applied to rebuild light field the control of three dimensional display, on the basis of body Three-dimensional Display, the display system catches reflective gratings screen real time position using the first encoder, and Projective Synchronization cooperation is carried out to it, many projection multiplexings are realized using this scheme, the refresh rate of three-dimensional display system spatial light modulator is greatly improved.
Description
Technical field
The invention belongs to body dimension display technologies field, more particularly, to a kind of rotating mirror formula volumetric 3 D display system and
Method.
Background technology
As the dimension display technologies of one of following Display Technique important development direction, being valued by people gradually.
But current dimension display technologies are the parallax type three-dimensional display system based on plane mostly, seldom there is real bore hole three
Tie up display.
Dimension display technologies main at present mainly have：Parallax type Three-dimensional Display, hologram three-dimensional shows, body Three-dimensional Display with
Light field rebuilds formula Three-dimensional Display.
Parallax type Three-dimensional Display：Typically make the aids such as observer's wearing spectacles, make the left and right two observation of observer
To slightly distinguishing left and right view, stereoscopic vision perception is produced using binocular parallax.But this method can not be really viewing
Person provides real three-dimensional scenic.
Hologram three-dimensional is shown：Holography is also known as holography, interference and diffraction principle using light, in photographic film or
By recording the amplitude and phase mehtod of light wave and the technology of reconstructed object 3-D view on dry plate.Remain all letters of object light
Breath.But the reason for be limited by amount of redundant information and display medium, current hologram three-dimensional can not equally provide 360 ° of continuous visual angles
Display.
Body Three-dimensional Display：Simulation threedimensional model is distributed in physical space, and each voxel of object is shown in three dimensions
Point information, scanning shows color and the brightness of the voxel of object, realizes the display of 3-D view.But its basic weakness is nothing
Method correctly shows the hiding relation of object.
On all synchronizing signal projection patterns of Three-dimensional Display projecting apparatus, the embedded microcontroller referred to is in reflective gratings
When not turning over one week and returning to origin position, give projecting apparatus one trigger signal, projecting apparatus is projected successively by the time calculated
The image sequence of model.The projection pattern precision is relatively low, it is impossible to realize the Three-dimensional Display of absolute angle, error easily occurs, hair
Raw shake situation.And this method has very big limitation in terms of rotating speed, high-speed motion is due to the accumulation of error, it is impossible to realized
Stable display.
Light field reconstruction technique is：One kind of threedimensional model corresponding orientation image is recorded and reproduced in all directions in space
Dimension display technologies.Such a Display Technique can realize that 360 ° of continuous parallaxes are shown around object, and need not wear any
Aid, realizes many people's viewings.While the spatial occlusion relationship of correct reflection elephant.
Overall construction design is limited by, the screen of common light field reconstruction technique only possesses horizontal direction rotatory power, nothing
The 3-D view of vertical direction is carried out visual field segmentation by method, therefore current light field reconstruction technique can only realize thing in level angle
360 ° of view field image sequences of body show that can only provide single horizontal direction 360 ° surround visual function, it is impossible to realize real
Solid angle show.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of rotating mirror controlled based on frame synchronization
Formula volumetric 3 D display system and method, applied to the control that three dimensional display is rebuild to light field, greatly improve Three-dimensional Display system
The refresh rate for spatial light modulator of uniting, makes observer to see corresponding angle threedimensional model with vertical direction in the horizontal direction
Correspondence image, realize space free angle Three-dimensional Display.
To achieve the above object, it is proposed, according to the invention, there is provided a kind of rotating mirror formula body Three-dimensional Display controlled based on frame synchronization
System, it is characterised in that watched including frame, microcontroller, the first servomotor, the first encoder, horizontal rotation support, second
Motor, second encoder, reflective gratings screen, host computer, projection arrangement and devating prism are taken, wherein,
The microcontroller and the first servomotor are arranged in the frame, the rotating shaft court of first servomotor
It is upper setting and its rotating speed be controlled by the microcontroller；
First encoder is connected with the rotating shaft of first servomotor, for obtaining first servomotor
Angular position information and send the angular position information to the microcontroller；
The horizontal rotation support is arranged in the rotating shaft of first servomotor；
Second servomotor is arranged on the horizontal rotation support and its rotating shaft is horizontally disposed；
The second encoder is connected with the rotating shaft of second servomotor, for obtaining second servomotor
Angular position information and send the angular position information to the microcontroller；
The reflective gratings screen is installed in the rotating shaft of second servomotor；
The host computer is used to obtain several slice maps to the carry out image procossing of three mould models, and passes through the microcontroller
These slice maps after processing are imported into the projection arrangement by device；
The devating prism and the projection arrangement are respectively arranged at the top of the reflective gratings screen, the polarization
Prism is used for the anaclasis for projecting the projection arrangement to the reflective gratings screen, so that in the reflective gratings
The slice map of the three moulds model is shown on screen, and then realizes that the 3 D stereo of the threedimensional model is shown.
Preferably, the projection arrangement has a many projecting apparatus, and the first servomotor rotating shaft from initial position
Start rotate a cycle time in, these projecting apparatus towards the reflective gratings screen alternating projection, wherein, described first
The time that the time of the rotating shaft rotation a cycle of servomotor turns around for its rotation.
Preferably, the reflective gratings screen is formed by many cylindrical gratings of grating orientation identical, the cylinder light
The surface spraying metal powder material of grid is to form reflecting surface.
Preferably, first encoder is connected by transmission mechanism with the rotating shaft of first servomotor.
Preferably, the microcontroller includes STM32 main control chips, the first encoder interfaces module, projecting apparatus triggering letter
Number module, communication module, motor control module and USB turn serial port module, wherein, first coder module is used to receiving the
The angle signal of one encoder, and the angle signal is passed to the STM32 main control chips；Projecting apparatus trigger signal module
Trigger signal for STM32 main control chips to be sent is sent to projection arrangement, and the communication module is used to drive mould to motor
Block transmission speed control information, the motor control module is used for the rotation of real-time controlled motor, and the USB turns serial port module use
Communicated in STM32 main control chips to host computer.
Preferably, collector ring is installed on second servomotor.
Preferably, first encoder is absolute type encoder.
According to another aspect of the present invention, additionally provide the rotating mirror formula volumetric 3 D display system described in a kind of basis and carry out
The method that 3 D stereo is shown, it is characterised in that detailed process is as follows：
1) first servomotor drives the reflective gratings screen rotation by the horizontal rotation support, together
When, the second servomotor drives the reflective gratings screen rotation.Microcontroller continuously reads the angle of the first encoder detection
Positional information is spent, when the first servomotor goes to the initial position of setting, the pause of the first servomotor is rotated；At the same time,
Microcontroller obtains the angular position information of the second servomotor rotating shaft also by second encoder, treats that the second servomotor is gone to
During the initial position of setting, the pause of the second servomotor is rotated；
2) the microprocessor control projection arrangement projects the 1st width image, then first to the reflective gratings screen
Servomotor and the second servomotor are started simultaneously at and rotated again, drive reflective gratings screen to do orthogonal rotary motion, institute
State microcontroller and the angle position of first servomotor is obtained by first encoder, and control projection arrangement in institute
The rotating shaft for stating the first servomotor and the second servomotor towards devating prism projection, is then thrown when reaching set angle position
Image device is just projected out the slice map of a frame threedimensional model when reflective gratings screen often goes to an angle position set,
So as to realize that the 3 D stereo of the threedimensional model is shown.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
1) present invention is applied to rebuild light field the control of three dimensional display, on the basis of body Three-dimensional Display, uses
The display system catches rotating mirror real time position using the first encoder, and carries out Projective Synchronization cooperation to it.Using this scheme not
Many DLP multiplexings are only realized, the refresh rate of three-dimensional display system spatial light modulator is greatly improved；
2) present invention makes observer in water also simultaneously suitable for the vertical parallax three dimensional display based on vertical orthogonal rotation
It square can see the correspondence image of corresponding angle threedimensional model to vertical direction, realize that real space free angle is three-dimensional
Display.For the control mode of described one sequence of pictures of transmission weekly, every frame synchronization of absolute position is realized
Control mode.
Brief description of the drawings
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is the schematic diagram of a part of structure of reflective gratings screen in the present invention；
Fig. 3 is schematic perspective view of the reflective gratings screen on horizontal rotation support in the present invention；
Fig. 4 is the particular flow sheet that whole display system operation and projection arrangement carry out frame triggering.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
1~Fig. 4 of reference picture, a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization, including frame 17, micro-control
It is device 16 processed, the first servomotor 15, the first encoder 13, horizontal rotation support 8, the second servomotor 7, second encoder, anti-
Formula grating screen 3, host computer, projection arrangement 1 and devating prism 2 are penetrated, wherein,
The servomotor 15 of microcontroller 16 and first is arranged in the frame 17, first servomotor 15
Rotating shaft set upward and its rotating speed is controlled by the microcontroller 16；
First encoder 13 is connected with the rotating shaft of first servomotor 15, for obtaining first servo
The angular position information of motor 15, and send the angular position information to the microcontroller 16；Preferably, described first compile
Code device 13 is absolute type encoder.
The horizontal rotation support 8 is arranged in the rotating shaft of first servomotor 15；Preferably, the first servomotor
Vertically-mounted in 15 rotating shaft to have drive link 9, the horizontal rotation support 8 is arranged on the first servo electricity by the drive link 9
In the rotating shaft of machine 15.
Second servomotor 7 is arranged on the horizontal rotation support 8 and its rotating shaft is horizontally disposed；
The second encoder is arranged in the rotating shaft of second servomotor 7, for obtaining the second servomotor 7
Rotating shaft angular position information and send the angular position information to the microcontroller 16；Due to reflective gratings screen
3 required precisions rotated in vertical direction are not high, therefore the second encoder can be carried using on the second servomotor 7
Incremental encoder, it is of course also possible to be absolute type encoder.
The reflective gratings screen 3 is installed in the rotating shaft of second servomotor 7；Preferably, reflective gratings
The periphery of screen 3, which also sets up screen holder 4, which to be horizontally disposed with fixation reflex formula grating screen 3, screen holder 4, transmission
Axostylus axostyle 6, transmission shaft lever 6 may be rotatably mounted on horizontal rotation support 8.
The host computer is used to obtain several slice maps to the carry out image procossing of three mould models of its storage inside, and leads to
Cross the microcontroller 16 these slice maps after processing are imported into the projection arrangement 1；Want to realize threedimensional model
Stereoscopic display, is threedimensional model to be handled by upper computer software first, obtain threedimensional model level, vertical two
The slice map for the setting position that direction is determined, the side view includes the information such as level, the vertical direction angle of threedimensional model.According to inspection
Projected image of the module with master system by threedimensional model in 360 ° of angle combinations different with vertical 180 ° of directions of level is surveyed to throw
Shadow to carry out orthogonal rotary motion double-sided reflecting formula grating screen on.After obtaining slice map, then use upper computer software
Slice map is imported into projection arrangement 1
The devating prism 2 and the projection arrangement 1 are respectively arranged at the top of the reflective gratings screen 3, described
Devating prism 2 is used for the anaclasis for projecting the projection arrangement 1 to the reflective gratings screen 3, so that described anti-
The slice map that the three moulds model is shown on formula grating screen 3 is penetrated, and then realizes that the 3 D stereo of the threedimensional model is shown, people
Eye just can directly watch the 3D figures of threedimensional model from the reflective gratings screen 3.
Further, the detailed process that progress 3 D stereo is shown is as follows：
1) first servomotor 15 drives the reflective gratings screen 3 to rotate by the horizontal rotation support 8,
Meanwhile, the second servomotor 7 drives the reflective gratings screen 3 to rotate.Microcontroller 16 continuously reads the first encoder 13
The angular position information of detection, when the first servomotor 15 goes to the initial position of setting, the pause of the first servomotor 15 turns
It is dynamic；At the same time, microcontroller 16 obtains the second servomotor 7 also by the encoder in the rotating shaft of the second servomotor 7
The angular position information of rotating shaft, when the second servomotor 7 goes to the initial position of setting, the pause of the second servomotor 7 is rotated；
2) microcontroller 16 controls projection arrangement 1 to project the 1st width image to the reflective gratings screen 3, then
First servomotor 15 and the second servomotor 7 are started simultaneously at and rotated again, drive reflective gratings screen 3 to do orthogonal rotation
Motion, the microcontroller 16 obtains the angle position of first servomotor 15 by first encoder 13, and controls
Projection arrangement 1 processed is when the rotating shaft of the servomotor 7 of the first servomotor 15 and second reaches set angle position towards institute
State devating prism 2 to project, then projection arrangement 1 is just projected when reflective gratings screen 3 often goes to an angle position set
Go out the slice map of a frame threedimensional model, so that realize that the 3 D stereo of the threedimensional model is shown, wherein, the second servomotor 7
Angle position can be obtained by the rotating ratio of the second servomotor 7 and the first servomotor.
Further, the projection arrangement 1 has many projecting apparatus, and the first servomotor 15 rotating shaft from initial bit
Put start rotate a cycle time in, these projecting apparatus towards the alternating projection of reflective gratings screen 3, wherein, it is described
The time that the time of the rotating shaft rotation a cycle of first servomotor 15 turns around for its rotation.All simultaneous techniques are reflective
When 3 acts of grating screen goes to weekly the position of some design, microcontroller 16 sends a trigger signal to projection arrangement 1,
Projection arrangement 1 is received after this signal, and by certain time interval, image sequence is sent on horizontal or vertical direction successively
All pictures of rebuilding are to projection arrangement 1 between 0-360 °.The time interval between every two field picture in image sequence is identical, and
And the servomotor of time interval=first rotates a circle required time/reconstruction number of pictures.
Using frame synchronizing can with each two field picture of Precise control three dimensional display, and by itself and at a high speed rotation
The absolute position that 3 acts of reflective gratings screen is corresponded to, and the tool to being rotated based on orthogonal can be realized using this technology
There is the control of the three dimensional display at vertical visual angle, the purpose of many ray machine splicing multiplexings can also be realized
Further, the reflective gratings screen 3 is formed by many cylindrical gratings of grating orientation identical, the cylinder light
The surface spraying metal powder material of grid is to form reflecting surface.
Further, first encoder 13 is connected by transmission mechanism with the rotating shaft of first servomotor 15.It is excellent
Selection of land, the transmission mechanism is tape handler, and tape handler has the first belt wheel 11 and the second belt wheel 12, the first encoder
13 are commonly mounted on same axis with first belt wheel 11, are so obtained with the angle position letter of the first servomotor 15
Breath, the first encoder 13 is arranged in the frame 17 by support frame 14.
Further, collector ring 5 is installed on second servomotor 7.
The system has projection arrangement 1, collector ring 5, direct current generator, motion detection sensor, servomotor and microcontroller
Device 16.Described reflective gratings screen 3 is connected with described rotational transmission, and by described rotating actuator band
Move it and do orthogonal rotary motion.Described projection arrangement 1 is located at the described top of reflective gratings screen 3, is sequentially connected
Described detection module and master system.Projection arrangement 1 is projected out corresponding figure according to the corresponding orientation information received
Picture, by devating prism 2, projects on reflective gratings screen 3, realizes three dimensional display capabilities.
Orthogonal rotary motion refers to around two orthogonal vertical axles while doing horizontal direction rotary motion and vertical
Azimuthal rotational motion.One of motor does horizontal direction rotation at a high speed, and another motor receives microcontroller by collector ring 5
16 motion synchronizing signal and the drive signal of drive module, drives screen holder to be erected with reflective gratings screen 3
The upward high-speed motion of Nogata, finally i.e. realize setting speed than high speed orthogonal rotary motion.
Modbus communication protocols are used between microcontroller 16 and motor driver, microcontroller 16 passes through serial ports mould
Block, sends required speed command to control the first servomotor 15 and the second servomotor 7 to rotate to motor driver.
Initial phase, the first servomotor 15 is with constant slow-speed of revolution campaign, for example 1r/s rotary speed movement, while micro-control
Device 16 processed continuously reads the angle position of the first encoder 13, stops when the first servomotor 15 goes to the initial position of setting
Only.Area thinks in absolute terms by initial position, and three dimensional display is before the display cycle of each new images starts, reflecting light
Grid screen curtain 3 can all return to the initial position of setting, it is ensured that synchronous scanning Three-dimensional Display it is accurate.
Determine after absolute initial position, microcontroller 16 passes through the protocol instructions described in transmission to driver, motor
Driver drives the first servomotor 15 and the second servomotor 7 to accelerate to setting speed, two with the smooth acceleration curve of S-shaped
Motor carries out the reflective gratings screen 3 above uniform high speed rotary motion, drive.
Reflective gratings screen 3 does orthogonal rotary motion, described projection arrangement 1 under mechanism system drive
Projected to underface, projected image falls on described reflective gratings screen 3.Projection arrangement 1 is every in reflective gratings screen 3
The moment of the position of a setting is gone to, just the Three-dimensional Display single frames that a frame calculates generation is projected out to reflective gratings screen 3
Image, i.e., realize projection per frame synchronization, realize the display effect of 3 D stereo.
By a period of motion (time being rotated by 360 °) for the rotating shaft of the first servomotor 15, according to the absolute position of angle
N number of node is divided into, and it is carried out position encoded.For example rebuild number of pictures be 40 (i.e. position nodes N=40, together
When screen rotation period when being 360 °, then the corresponding absolute trigger position of trigger signal is at each 9 ° in a cycle),
The process of implementing is：It is to rotate during one 360 ° in screen motion a cycle, microcontroller 16 continuously reads the
The angle position of one encoder 13, if：The angle %9=0 read (0 is equal to 9 remainders), then think reflecting light
Grid screen curtain 3, which has been gone to, often to turn over 9 ° of moment with location of projection, i.e. motor, and microcontroller 16 is i.e. to projection arrangement
1 provides a trigger signal, and projection arrangement 1 projects a frame picture, you can with realize control projection arrangement 1 complete projected image with
Revolve the accurate real-time synchronization of the position of reflective gratings screen 3.
Trigger signal needed for the triggering projection of the projection arrangement 1 is a series of pulse signal, and projection arrangement 1 is in arteries and veins
Rush the rising edge of signal, you can carry out the projection of a frame picture or one group of sequence of pictures.The present invention is touched using outer signal
Hair projection, projects a frame picture in the rising edge of pulse signal, realizes per frame synchronization.
In the present invention, the described module of microcontroller 16 is the control module based on field programmable gate array, is based on
Control module based on STM32.The circuit board employed in the invention is in addition to STM32 master chips, in addition to the first encoder
13 interface modules, projecting apparatus trigger signal module, TFT screen display modules, motor control module, USB turn serial port module, LED
Display module, communication module and key-press module etc.；Wherein, the module of the first encoder 13 is used for the angle for receiving the first encoder 13
Signal is spent, and the angle signal is passed to STM32 main control chips；Projecting apparatus trigger signal module is used for STM32 master controls
The trigger signal that chip is sent is sent to projection arrangement 1；TFT screen interfaces module, LED module are respectively used to control TFT, LED
Display；Communication module is that TTL turns 485 serial communication modules, for STM32 main control chips to motor drive module transmission speed
Etc. control information, the motion of real-time controlled motor；USB turns serial port module and communicated for STM32 main control chips to host computer,
It is easy to man-machine interaction；Key-press module is used to test the action such as jerk, startup, or is used as display system switching.
The first encoder 13 that the present invention is used is absolutely unique, anti-interference and without power-failure memory in each position,
Read signal can be sent, the first encoder 13 receives reading to the first encoder 13 by agreement of the microcontroller 16 by SPI
After signal, the real-time angular position at the place of the coupled axle of Real-time Feedback.
The projecting apparatus predominantly based on DLP (Digital Light Processing, digital light processing system) or
LCD (Liquid Crystal Display, solid-state liquid crystal display) lcd technology.The major part of the projecting apparatus is
LC3000 development boards.The projection for every frame sequence of pictures that the development board can be controlled manually, it would however also be possible to employ outer signal
Triggering mode realize automatic projection.Trigger signal needed for the triggering projection of the outer signal of the projecting apparatus is a series of arteries and veins
Signal is rushed, projecting apparatus carries out the projection of a frame picture or one group of sequence of pictures in the rising edge of pulse signal.
Except basic projection arrangement 1, for the ease of man-machine interaction.Some external other modules of the display system, than
Such as TFT screen display modules, it can show whether reflective gratings screen 3 returns to the information such as origin, and rotating speed, step pitch,
The convenient real-time condition to motion is understood and analyzed.And every frame synchronization image reconstruction number can be adjusted, realize different
The Three-dimensional Display of precision.
Described collector ring 5, while it can continuously rotate used in any requirement, needs from fixed position to rotation again
In the Mechatronic Systems of location transmission power supply and signal.Slip ring can improve systematic function, simplied system structure, it is to avoid wire is in rotation
Cause to sprain during turning.The collector ring 5 used in the invention, can make motor on vertical direction when rotated, it is to avoid with
Its connected wire is mutually wound in rotation to be sprained, and control signal is accurately transmitted with driving power supply, is realized two
The synchronization of motor signal.
The control program of described orthogonal rotary motion, it is mutual around two that it is mainly characterized by reflective gratings screen 3
Mutually vertical axle is rotated simultaneously.Screen herein includes but are not limited to reflective gratings screen 3.Basis is watched first
The control protocol of motor and drive system is taken, the signal of setting is sent by described microcontroller 16, passes through the signal of collector ring 5
Transmission, controls two motors to realize synchronous orthogonal rotary motion, makes horizontal direction and two motors of vertical direction respectively
Setting speed ratio is realized, and by closed-loop control, speed is kept stable.
Described motion detection block detects the reflective gratings screen 3 initial position in the two directions and rotation
Speed.When grating screen turns over an initial position, i.e. origin position set, embedded microcontroller 16 just gives projection dress
Put 1 and send corresponding signal, enable projection arrangement 1, alternating projection is carried out, so as to realize the relative deflection angle that threedimensional model is shown
The degree stability contorting pattern unrelated with grating screen initial position, eliminates grating screen initial angle and is brought to model display
Error, realize the projection of real absolute type.
The image sequence of projecting apparatus has corresponded to each particular location of reflective gratings screen 3 in rotation, the position
Contain the specific azimuth information of horizontal azimuth and two, vertical azimuth.Projecting apparatus is compiled according to the corresponding orientation information received
Number corresponding slice map is projected out, realizes three dimensional display capabilities.
The multiplexing connection scheme of many projecting apparatus, is specially, by the period of motion of a screen, threedimensional model to be needed aobvious
The angular range shown, according to homogeneous angular be divided into N number of absolute position it is carried out it is position encoded.Assuming that projection arrangement 1 has M
Platform projecting apparatus, then N number of absolute position of a swing circle averagely can be divided into M group, then the image in the i-th group
The set of (i, i+M, i+2M, i+3M......i+N-M) width slice map composition for the, wherein 1≤i≤M, N can be divided exactly by M；And
Each group of corresponding numbering is sent to corresponding projection arrangement 1, reaches superposition many projecting apparatus of multiplexing to improve Three-dimensional Display
The purpose of refresh rate.
Many ray machine multiplexings are carried out using the system, i.e., two or more projecting apparatus alternating projections make projecting apparatus alternating projection
Threedimensional model image, can be arranged all three dimensional rendered images source sequences that calculates by the order of projection, i.e. graphic projection one
Individual sequence, puts on sequence number, such as from N_0 to N_360 by projection sequence.The wherein calculating Three-dimensional Display single frames figure of serial number odd number
Picture, the order projecting apparatus of one of them is projected in corresponding odd number coding site, and the slice map of serial number even number makes another
Individual projecting apparatus is projected in corresponding even number position.This alternating projection control program, reduces projecting apparatus in projection frequency
The requirement of rate, i.e., using the projecting apparatus of projection frequency of the same race, it is possible to achieve more than twice of projection frequency, is greatly reduced into
This.
Described above is orthogonal motion imaging contexts, below for only threedimensional model around vertical axes be rotated into as
Slice map projects and projects to illustrate citing around the slice map that trunnion axis is rotated into picture
The embodiment that the slice map projection as (horizontal direction imaging) is rotated into around vertical axes of only threedimensional model is as follows：
Horizontal direction shows that system is main：Reflective gratings screen 3 and the associated mechanical structure such as rotation, fixed, projection dress
Put the part such as 1, microcontroller 16, DC servo motor and its controller, host computer composition.Projector apparatus 1 is responsible for then basis
Relevant control trigger signal carries out the projection of correspondence image；The undertaking reflection that reflective gratings screen 3 is responsible for projected image is completed
Imaging moiety；Microcontroller 16 is combined with host computer, by the operational order of host computer, and microcontroller 16 completes whole system letter
Number feedback and transmission, the control process of motion flow；DC servo motor and its driver complete mechanical structure spinning movement
Implement.
Imaging process in horizontal direction is specific as follows：First, operated according to host computer, every ginseng is carried out in initialization
Several settings, including：The setting of rotating speed, triggers weekly the setting of frame number, and image source importing processing procedure etc..Complete ginseng
After number setting process, operational order is performed, starts system operation.Mechanism action is divided into four-stage, initialized location
It is determined that, motor accelerator, even running is held as process, decelerating through motor stopped process.
When initialized location is determined, host computer sends operational order to microcontroller 16, and microcontroller 16 is by referring to
The parsing of order, then the speed command of initialization procedure is sent to motor driver by Modbus agreements, motor driver rings
Motor is operated with 1r/s lower-speed state after answering, while microcontroller 16 goes to reading angular position by the first encoder 13
Information, after motor is operated to the initial position of setting, microcontroller 16 sends halt instruction to driver, and motor stops fortune
Turn.Meanwhile, initialization completion signal is fed back to epigynous computer section by microcontroller 16, and host computer starts to import selected image sequence
First two field picture of row.
Second step, system starts imaging process.When host computer bring into operation operation, microcontroller 16 receives correlation
Instruction, starts to send accelerating velocity signal to driver, in order to ensure the steady progress of accelerator, accelerator is taken smoothly
Curve accelerator, rate curve is typically chosen in S type acceleration curves.Receive the rate signal of microcontroller 16, driver
Controlled motor completes closed loop accelerator.Signal trigger process is opened simultaneously in accelerator, such as setting NIPR=40, then
Microcontroller 16 detects the position that motor rotates every 9 °, then sends a frame trigger signal to projecting apparatus, completes what is once projected
Trigger process.Because accelerator is erratic process, therefore, stable imaging is not had in accelerator.
When accelerating to complete, start stable hold as process.According to the triggering frame per second set weekly, microcontroller 16 is gone continuously
The turned position that motor is presently in is read, (set angle is calculated by triggering frame per second, such as when position is equal to set angle
NIPR=40 is such as set, set angle is 360 °/40=9 °, every 9 ° of motor rotation, once trigger), microcontroller 16
A frame trigger signal is sent to projecting apparatus, projecting apparatus receives trigger signal while completing the projection of current location correspondence image.
Into after even running process, servomotor reaches the stabilization of speed, and the position signalling that microcontroller 16 is read also reaches surely
Determine the stage, trigger signal now is sent to the stable triggering projection of projecting apparatus, then projecting apparatus completion image with the stable cycle
Process.At this point it is possible to carry out the observation of stable display effect in the horizontal direction.
Finally slow down stopped process, it is similar with accelerator, speed reduction is completed in the form of even pace's curve, until
The process of stopping.Unlike, when stopped process starts, microcontroller 16 only completes the mistake to driver transmission speed signal
Journey, no longer trigger signal is sent in stopped process to projecting apparatus.
The specific embodiment for being rotated into the slice map projection as (vertical direction imaging) around trunnion axis is as follows：
Vertical direction shows that system is main：Reflective gratings screen 3 and the associated mechanical structure such as rotation, fixed, projection dress
Put the part such as 1, microcontroller 16, DC servo motor and its controller, host computer composition.Projecting apparatus is responsible for then according to correlation control
Trigger signal processed carries out the projection of correspondence image；The undertaking reflection that reflective gratings screen 3 is responsible for projected image completes imaging section
Point；Microcontroller 16 is combined with host computer, and by the operational order of host computer, microcontroller 16 completes the anti-of whole system signal
Feedback and transmission, the control process of motion flow；DC servo motor and its driver complete the specific of mechanical structure spinning movement
Realize.
The imaging process of vertical direction is specific as follows：First, it is identical with the control mode of horizontal direction, grasped according to host computer
Make, the setting of parameters is carried out in initialization.Complete after parameters setting process, perform operational order, start system operation
Process.Mechanism action is also classified into four-stage, substantially identical with horizontal direction.When initialized location is determined, host computer will be grasped
Make instruction to send to microcontroller 16, controller is transmitted drive signal to motor by collector ring 5 and driven by the parsing of instruction
On device, motor is operated with 1r/s lower-speed state, while microcontroller 16 goes to reading angular position by the first encoder 13
Confidence ceases, after motor is operated to the initial position of setting, and microcontroller 16 sends halt instruction to driver, and motor stops
Operating.Meanwhile, initialization completion signal is fed back to epigynous computer section by microcontroller 16, and host computer starts to import selected image
First two field picture of sequence.Second step, system starts imaging process.When host computer bring into operation operation, microcontroller
16 start to send accelerating velocity signal to driver, and driver control motor completes closed loop accelerator.It is same in accelerator
When open signal trigger process, such as setting NIPR=40, then microcontroller 16 detect motor and rotate every 9 ° of position, then to
Projecting apparatus sends a frame trigger signal, completes the trigger process once projected.When accelerating to complete, start stable hold as process.
According to the triggering frame per second set weekly, microcontroller 16 goes to the turned position that continuous reading motor is presently in, when position is equal to
(set angle is calculated by triggering frame per second, and such as setting NIPR=40, set angle is 360/40=9, electricity during set angle
Every 9 ° of machine rotation, once trigger), microcontroller 16 sends a frame trigger signal to projecting apparatus, and projecting apparatus receives tactile
Signal and complete the projection of current location correspondence image simultaneously.At this point it is possible to carry out the sight of stable display effect in vertical direction
Examine.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (8)
1. it is a kind of based on frame synchronization control rotating mirror formula volumetric 3 D display system, it is characterised in that including frame, microcontroller,
First servomotor, the first encoder, horizontal rotation support, the second servomotor, second encoder, reflective gratings screen,
Host computer, projection arrangement and devating prism, wherein,
The microcontroller and the first servomotor are arranged in the frame, and the rotating shaft of first servomotor is set upward
Put and its rotating speed is controlled by the microcontroller；
First encoder is connected with the rotating shaft of first servomotor, for obtaining the angle of first servomotor
Degree positional information simultaneously sends the angular position information to the microcontroller；
The horizontal rotation support is arranged in the rotating shaft of first servomotor；
Second servomotor is arranged on the horizontal rotation support and its rotating shaft is horizontally disposed；
The second encoder is connected with the rotating shaft of second servomotor, for obtaining the angle of second servomotor
Degree positional information simultaneously sends the angular position information to the microcontroller；
The reflective gratings screen is installed in the rotating shaft of second servomotor；
The host computer is used to obtain the carry out image procossing of three mould models several slice maps, and will by the microcontroller
These slice maps after processing are imported into the projection arrangement；
The devating prism and the projection arrangement are respectively arranged at the top of the reflective gratings screen, the devating prism
For the anaclasis that projects the projection arrangement to the reflective gratings screen, so that in the reflective gratings screen
The slice map of the upper display three moulds model, and then realize that the 3 D stereo of the threedimensional model is shown.
2. a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization according to claim 1, it is characterised in that
The projection arrangement has many projecting apparatus, and a cycle is rotated since initial position in the rotating shaft of the first servomotor
Time in, these projecting apparatus towards the reflective gratings screen alternating projection, wherein, the rotating shaft of first servomotor rotation
The time for turning a cycle is the time that its rotation is turned around.
3. a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization according to claim 1, it is characterised in that
The reflective gratings screen is formed by many cylindrical gratings of grating orientation identical, the surface spraying metal of the cylindrical grating
Dusty material is to form reflecting surface.
4. a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization according to claim 1, it is characterised in that
First encoder is connected by transmission mechanism with the rotating shaft of first servomotor.
5. a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization according to claim 1, it is characterised in that
The microcontroller include STM32 main control chips, the first encoder interfaces module, projecting apparatus trigger signal module, communication module,
Motor control module and USB turn serial port module, wherein, first coder module is used for the angle letter for receiving the first encoder
Number, and the angle signal is passed to the STM32 main control chips；Projecting apparatus trigger signal module is used for STM32 master controls
The trigger signal that chip is sent is sent to projection arrangement, and the communication module is used to control to believe to motor drive module transmission speed
Breath, the motor control module is used for the rotation of real-time controlled motor, and the USB, which turns serial port module, is used for STM32 main control chips
Communicated to host computer.
6. a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization according to claim 1, it is characterised in that
Collector ring is installed on second servomotor.
7. a kind of rotating mirror formula volumetric 3 D display system controlled based on frame synchronization according to claim 1, it is characterised in that
First encoder is absolute type encoder.
8. a kind of carry out what 3 D stereo was shown according to any described rotating mirror formula volumetric 3 D display system in claim 1~7
Method, it is characterised in that detailed process is as follows：
1) first servomotor drives the reflective gratings screen rotation by the horizontal rotation support, meanwhile, the
Two servomotors drive the reflective gratings screen rotation.Microcontroller continuously reads the angle position of the first encoder detection
Information, when the first servomotor goes to the initial position of setting, the pause of the first servomotor is rotated；At the same time, microcontroller
Device obtains the angular position information of the second servomotor rotating shaft also by second encoder, treats that the second servomotor goes to setting
During initial position, the pause of the second servomotor is rotated；
2) the microprocessor control projection arrangement projects the 1st width image to the reflective gratings screen, then the first servo
Motor and the second servomotor are started simultaneously at and rotated again, drive reflective gratings screen to do orthogonal rotary motion, described micro-
Controller obtains the angle position of first servomotor by first encoder, and controls projection arrangement described the
The rotating shaft of one servomotor and the second servomotor is filled when reaching set angle position towards devating prism projection, then projection
The slice map that a frame threedimensional model is just projected out when reflective gratings screen often goes to an angle position set is put, so that
Realize that the 3 D stereo of the threedimensional model is shown.
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Application publication date: 20170818 |