CN105223795A - A kind of large format digitizing hologram type apparatus and method - Google Patents
A kind of large format digitizing hologram type apparatus and method Download PDFInfo
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Abstract
The present invention proposes a kind of large format digitizing hologram type apparatus and method.This device main modular comprises the fast parallel computing module of the holographic stereogram of full parallax, primitive image loads and record exposure control module, micropatterning lens focusing control module, full parallax hologram recording material carrying and accurate quick position module.Computing machine controls with auto-focusing respectively, short-time exposure controls, two-dimentional precise mobile platform is connected in high configuration, realize that holographic picture transmits continuously, the movement of photosensitive holographic recording medium, hologram different-time exposure control; Under CUDA framework, the program parallelization process of holographic for full parallax stereogram can be realized the quick calculating to the holographic stereogram of the full parallax of large format, the digitizing quick holographic that native system device can realize full parallax true color holography stereogram prints.
Description
Technical field
The present invention relates to a kind of large format digitizing hologram type apparatus and method, belong to holographic display field.
Background technology
Digitizing hologram type technology is the product of the field correlation technique mixing together such as optics, machinery, electronics, computing machine, is the study hotspot of recent domestic 3D imaging field.Hologram type for 3D target color mainly contains two kinds of approach.First method is: by diffraction process and the interventional procedures of computational algorithm simulation 3D object, calculates the hologram of 3D object and blockette carries out " laser direct-writing " prints on recording materials and realize holographic imaging, i.e. " non-interfering record ".Second method is: the manufacturing process of the holographic stereogram of simulated optical, obtain a series of image sequence with one dimension (or two dimension) parallax by microcomputer modelling software or obtained the anaglyph sequence of actual 3D object or scene by the mode of camera-scanning, the mode of being synthesized by computer code obtains the primitive pattern matrix that can produce parallax effect, by printing on the photosensitive material by these primitive pattern matrixs in " interfering record " mode, then can obtain holographic 3D imaging effect.
At present, the printing of computed hologram is studied both at home and abroad.The main researchist of ZebraImaging company of the U.S. that has has invented the method for making of the stereoscopic rainbow color hologram of large format.The Yamaguchi of Tokyo Institute of Technology etc. also reported the colour full parallax holographic stereogram method for making based on high density light field reconstruction technique in 2011; The researchist of Geola company of Lithuania reported the color hologram print system based on red, green, blue three look pulsed laser and panchromatic silver salt dry plate in 2011, produced the colour reflection hologram only having horizontal parallax (HPO) about having half people high; The Chen Linsen professors of University Of Suzhou etc. adopt two-step approach rainbow holography to realize the digitizing rainbow holography record etc. of three-dimensional panoramic show.
At present, the bottleneck restricting digitizing hologram type technical development is mainly in the large format holograph printing system and method, high performance hologram recording material etc. of the acquisition of information of large information capacity 3D scene and immediate processing method, high quality and high efficiency.Along with the development of high-performance calculation platform, the process of large data message becomes more and more quick, and this provides good condition to the acquisition of hologram type figure source information and fast processing.The fast coding realizing large format high resolution 3 d printed drawings source information is needed to need to carry out deep algorithm research.For large-breadth printing color hologram, the principal element affecting image quality has two aspects: one is the resolution, image field distortion, positioning precision etc. of hologram type system; Two is performance parameters such as wavefront modification pattern, spectral response characteristic, spatial frequency response of recording materials.Printing effect refers generally to the ability of printed holograms size in the unit interval, can represent by the number printing elementary hologram p.s..The hardware factor affecting hologram type efficiency mainly contains the watt level of LASER Light Source, the spectral response sensitivity of recording materials, the quick mobile precise positioning performance etc. of mobile platform.
Summary of the invention
For the defect that prior art exists, the object of the invention is to propose a kind of large format digitizing hologram type apparatus and method.For color 3D object or 3D scene, utilize fast parallel computing environment to carry out information processing fast and coding to it, obtain the image information needed for holographic 3D printing, and carry out formation of hologram by calculation and control central transmission to hologram type system.The positioning precision of the mobile platform of this device reaches submicron order, can realize instantaneous exposure by short-time pulse laser instrument, uses DMD to realize fast refresh, uses CUDA framework can realize quick calculating in GPU parallel computation.
According to above-mentioned inventive concept, the present invention adopts following technical proposals:
A kind of large format digitizing hologram type device, comprise control system and light path system, described control system comprises laser instrument short-time exposure control module, fast parallel calculating and System Control Center, focusing supervisory system and mobile platform controller, described laser instrument short-time exposure control module controls red laser by the mode of shutter, blue laser, the time shutter of green laser, holographic for the large format calculated stereogram substep is loaded on digital micro-mirror device by fast parallel calculating by fast parallel calculating and System Control Center, focusing supervisory system is monitored elementary hologram unit by CCD camera and is focused to elementary hologram unit by the miniature camera lens of high resolving power, mobile platform controller controls the movement of two-dimensional movement plateau levels and vertical direction, the primitive that digital micro-mirror device is shown holographic stereogram unit stepper exposure prints, described light path system comprises red laser, blue laser, green laser, first half-wave plate second half-wave plate, 3rd half-wave plate, first dichroic filter, second dichroic filter, first catoptron, first beam-splitter, second catoptron, first object lens, first diaphragm, first lens, 3rd catoptron, first polaroid, 4th catoptron, second diaphragm, two-dimensional movement platform, panchromatic hologram recording material, the miniature camera lens of high resolving power, second beam-splitter, second lens, CCD camera, 5th catoptron, digital micro-mirror device, 6th catoptron, second object lens, 3rd lens, 3rd diaphragm, second polaroid, the light beam sent by red laser is successively through the 3rd half-wave plate, first catoptron, second dichroic filter and the first dichroic filter, the light beam sent by blue laser is successively through the second half-wave plate, second dichroic filter and the first dichroic filter, the light beam sent by green laser pools a branch of successively after the first half-wave plate and the first dichroic filter, through the first beam-splitter, light beam is divided into reference light light beam and object light light beam, the light path of wherein reference light light beam places the first object lens successively, first diaphragm, first lens, 3rd catoptron, first polaroid, 4th catoptron, second diaphragm, two-dimensional movement platform, panchromatic hologram recording material, the light path of described object light light beam is placed successively the second catoptron, the 6th catoptron, the second object lens, the 3rd lens, the 3rd diaphragm, the second polaroid, digital micro-mirror device, the 5th catoptron, the second beam-splitter, the second lens, CCD camera and the miniature camera lens of high resolving power.
A kind of large format digitizing hologram type method, described method comprises:
1) experimentally device adjusts light path;
2) load elementary hologram unit, be divided into elementary hologram unit to be loaded into digital micro-mirror device successively holographic for the large format calculated stereogram by fast parallel calculating and System Control Center by fast parallel calculating;
3) focus, monitor elementary hologram unit by CCD camera and by high resolving power miniature camera lens, elementary hologram unit focused;
4) exposure is interfered, controlled the time shutter of red laser, blue laser, green laser by the mode of shutter by laser instrument short-time exposure control module, red laser, blue laser, green laser are exposed give off laser beam, the reference light light beam be then divided into by light beam by the first beam-splitter and object light light beam are interfered at panchromatic hologram recording material place and are printed elementary hologram unit;
5) moving recording material, is controlled the panchromatic hologram recording material of movement of two-dimensional movement plateau levels and vertical direction by adjustment mobile platform controller and is printed next elementary hologram unit, and it is complete to the printing of large format holographic stereogram to repeat above step.
Compared with prior art, the present invention has following outstanding substantive distinguishing features and significant advantage:
The present invention uses the exposure system based on short-time pulse laser instrument to realize instantaneous exposure, with the time shutter of shutter control RGB tri-look laser light source, keep identical with the time of the pulse computing unit of raster count reaction type mobile platform, and then control writing time of each elementary hologram of the holographic stereogram of full parallax, realize the loading one by one of primitive image.
Accompanying drawing explanation
Fig. 1 is large format digitizing hologram type device light channel structure.
Fig. 2 is that multi-core CPU and many core GPU work in coordination with primitive image sequence quick calculation method schematic diagram under parallel computation environment.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical solution of the present invention:
As shown in Figure 1, a kind of large format digitizing hologram type device, comprise control system and light path system, described control system comprises laser instrument short-time exposure control module 32, fast parallel calculating and System Control Center 33, focusing supervisory system 34 and mobile platform controller 35, described laser instrument short-time exposure control module 32 controls red laser 1 by the mode of shutter, blue laser 2, the time shutter of green laser 3, holographic for the large format calculated stereogram substep is loaded on digital micro-mirror device 26 by fast parallel calculating by fast parallel calculating and System Control Center 33, focusing supervisory system 34 is monitored elementary hologram unit by CCD camera 24 and is focused by the miniature camera lens of high resolving power 21 pairs of elementary hologram unit, mobile platform controller 35 controls the movement of two-dimensional movement platform 19 level and vertical direction, the primitive that digital micro-mirror device 26 is shown holographic stereogram unit stepper exposure prints, described light path system comprises red laser 1, blue laser 2, green laser 3, first half-wave plate 4, second half-wave plate 5, 3rd half-wave plate 6, first dichroic filter 7, second dichroic filter 8, first catoptron 9, first beam-splitter 10, second catoptron 11, first object lens 12, first diaphragm 13, first lens 14, 3rd catoptron 15, first polaroid 16, 4th catoptron 17, second diaphragm 18, two-dimensional movement platform 19, panchromatic hologram recording material 20, the miniature camera lens 21 of high resolving power, second beam-splitter 22, second lens 23, CCD camera 24, 5th catoptron 25, digital micro-mirror device 26, 6th catoptron 27, second object lens 28, 3rd lens 29, 3rd diaphragm 30, second polaroid 31, the light beam sent by red laser 1 is successively through the 3rd half-wave plate 6, first catoptron 9, second dichroic filter 8 and the first dichroic filter 7, the light beam sent by blue laser 2 is successively through the second half-wave plate 5, second dichroic filter 8 and the first dichroic filter 7, the light beam sent by green laser 3 pools a branch of successively after the first half-wave plate 4 and the first dichroic filter 7, through the first beam-splitter 10, light beam is divided into reference light light beam and object light light beam, the light path of wherein reference light light beam places the first object lens 12 successively, first diaphragm 13, first lens 14, 3rd catoptron 15, first polaroid 16, 4th catoptron 17, second diaphragm 18, two-dimensional movement platform 19, panchromatic hologram recording material 20, the light path of described object light light beam is placed successively the second catoptron 11, the 6th catoptron 27, second object lens 28, the 3rd lens 29, the 3rd diaphragm 30, second polaroid 31, digital micro-mirror device 26, the 5th catoptron 25, second beam-splitter 22, second lens 23, CCD camera 24 and the miniature camera lens 21 of high resolving power.
A kind of large format digitizing hologram type method, described method comprises:
1) experimentally device adjusts light path;
2) load elementary hologram unit, be divided into elementary hologram unit to be loaded into digital micro-mirror device 26 successively holographic for the large format calculated stereogram by fast parallel calculating and System Control Center 33 by fast parallel calculating;
3) focus, monitor elementary hologram unit by CCD camera 24 and focused by the miniature camera lens of high resolving power 21 pairs of elementary hologram unit;
4) exposure is interfered, controlled the time shutter of red laser 1, blue laser 2, green laser 3 by the mode of shutter by laser instrument short-time exposure control module 32, red laser 1, blue laser 2, green laser 3 are exposed give off laser beam, the reference light light beam be then divided into by light beam by the first beam-splitter 10 and object light light beam are interfered at panchromatic hologram recording material 20 place and are printed elementary hologram unit;
5) moving recording material, control the panchromatic hologram recording material of movement 20 of two-dimensional movement platform 19 level and vertical direction by adjustment mobile platform controller 35 and print next elementary hologram unit, and it is complete to the printing of large format holographic stereogram to repeat above step.
Principle of the present invention is as follows:
As shown in Figure 2, be that multi-core CPU and many core GPU work in coordination with primitive image sequence quick calculation method schematic diagram under parallel computation environment.The holographic stereogram of the full parallax obtained by calculation holographic is that the method for graphic based processor (GPU) parallel computation is to realize quick calculating by traditional central processing unit (CPU) multithreading computed improved, for the holographic stereogram of this full parallax when modulating the elementary hologram in corresponding diffraction direction, due to the independence between each elementary hologram and the similarity of self algorithm, the general-purpose computations ability of GPU is used whole full parallax hologram divided block independently to be carried out calculating the holographic stereogram of full parallax, the subarea of formed objects is divided by gathering multi-view image sequence, multi-view image for same subarea puts into same GPU block, then by thread, coding is carried out to each subarea image and obtain elementary hologram unit, thus realize parallel computation.
For complicated true color 3D object or scene, the Fast back-projection algorithm computing method of the stereoscopic primitive image sequence of large format based on fast parallel computing environment are proposed; Utilize the ability of GPU general-purpose computations, under CUDA framework, holographic for full parallax stereogram algorithm is divided into two parts: the fast parallel calculating of whole GPU is under universal parallel computing architecture (CUDA), and calculation holographic program is divided into two parts: host side program and equipment end program.Host side program refers to the program performed on CPU, equipment end program is then the program part that GPU performs, after host side program is by DSR, copy in the internal memory in GPU, by GPU actuating equipment end program, by host side program, result is fetched from GPU internal memory again after completing, significantly can shorten time and the calculating meeting large format size.The hologram type system light path device loading hologram type primitive image based on digital micromirror part (DMD) is proposed.Compared with LCD device, the efficiency of light energy utilization of DMD, refresh rate, the performance parameter such as dynamic range and image contrast are more outstanding.The raising of the efficiency of light energy utilization can reduce hologram type and be concerned with writing time, improves the printing effect of hologram.Adopt the mode of oblique incidence in the design, make the direction of propagation of the light through DMD modulation parallel with dmd chip workplace normal direction, be conducive to the image quality improving micropatterning system.
Claims (2)
1. a large format digitizing hologram type device, comprise control system and light path system, it is characterized in that, described control system comprises laser instrument short-time exposure control module (32), fast parallel calculating and System Control Center (33), focusing supervisory system (34) and mobile platform controller (35), described laser instrument short-time exposure control module (32) controls red laser (1) by the mode of shutter, blue laser (2), the time shutter of green laser (3), holographic for the large format calculated stereogram substep is loaded on digital micro-mirror device (26) by fast parallel calculating by fast parallel calculating and System Control Center (33), focusing supervisory system (34) is also focused to elementary hologram unit by the miniature camera lens of high resolving power (21) by CCD camera (24) monitoring elementary hologram unit, mobile platform controller (35) controls the movement of two-dimensional movement platform (19) level and vertical direction, the primitive that digital micro-mirror device (26) is shown holographic stereogram unit stepper exposure prints, described light path system comprises red laser (1), blue laser (2), green laser (3), first half-wave plate (4), second half-wave plate (5), 3rd half-wave plate (6), first dichroic filter (7), second dichroic filter (8), first catoptron (9), first beam-splitter (10), second catoptron (11), first object lens (12), first diaphragm (13), first lens (14), 3rd catoptron (15), first polaroid (16), 4th catoptron (17), second diaphragm (18), two-dimensional movement platform (19), panchromatic hologram recording material (20), the miniature camera lens of high resolving power (21), second beam-splitter (22), second lens (23), CCD camera (24), 5th catoptron (25), digital micro-mirror device (26), 6th catoptron (27), second object lens (28), 3rd lens (29), 3rd diaphragm (30), second polaroid (31), the light beam sent by red laser (1) is successively through the 3rd half-wave plate (6), first catoptron (9), second dichroic filter (8) and the first dichroic filter (7), the light beam sent by blue laser (2) is successively through the second half-wave plate (5), second dichroic filter (8) and the first dichroic filter (7), the light beam sent by green laser (3) pools a branch of successively after the first half-wave plate (4) and the first dichroic filter (7), through the first beam-splitter (10), light beam is divided into reference light light beam and object light light beam, the light path of wherein reference light light beam places the first object lens (12) successively, first diaphragm (13), first lens (14), 3rd catoptron (15), first polaroid (16), 4th catoptron (17), second diaphragm (18), two-dimensional movement platform (19), panchromatic hologram recording material (20), the light path of described object light light beam is placed successively the second catoptron (11), the 6th catoptron (27), the second object lens (28), the 3rd lens (29), the 3rd diaphragm (30), the second polaroid (31), digital micro-mirror device (26), the 5th catoptron (25), the second beam-splitter (22), the second lens (23), CCD camera (24) and the miniature camera lens of high resolving power (21).
2. a large format digitizing hologram type method, is characterized in that, described method comprises:
1) experimentally device adjusts light path;
2) load elementary hologram unit, be divided into elementary hologram unit to be loaded into digital micro-mirror device (26) successively holographic for the large format calculated stereogram by fast parallel calculating and System Control Center (33) by fast parallel calculating;
3) focus, also by the miniature camera lens of high resolving power (21), elementary hologram unit is focused by CCD camera (24) monitoring elementary hologram unit;
4) exposure is interfered, controlled the time shutter of red laser (1), blue laser (2), green laser (3) by the mode of shutter by laser instrument short-time exposure control module (32), red laser (1), blue laser (2), green laser (3) are exposed give off laser beam, the reference light light beam be then divided into by light beam by the first beam-splitter (10) and object light light beam are interfered at panchromatic hologram recording material (20) place and are printed elementary hologram unit;
5) moving recording material, control the panchromatic hologram recording material of movement (20) of two-dimensional movement platform (19) level and vertical direction by adjustment mobile platform controller (35) and print next elementary hologram unit, and it is complete to the printing of large format holographic stereogram to repeat above step.
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| CN110321089A (en) * | 2019-07-10 | 2019-10-11 | 中国人民解放军陆军装甲兵学院 | A kind of holography stereogram Method of printing and system |
| CN111179734A (en) * | 2020-01-16 | 2020-05-19 | 深圳市金质金银珠宝检验研究中心有限公司 | Method for realizing reflective volume holographic color three-dimensional anti-counterfeiting |
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Application publication date: 20160106 |