CN107121917A - A kind of method for suppressing to calculate holographic speckle noise - Google Patents
A kind of method for suppressing to calculate holographic speckle noise Download PDFInfo
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- CN107121917A CN107121917A CN201710322592.2A CN201710322592A CN107121917A CN 107121917 A CN107121917 A CN 107121917A CN 201710322592 A CN201710322592 A CN 201710322592A CN 107121917 A CN107121917 A CN 107121917A
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- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000001629 suppression Effects 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000002688 persistence Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
- G03H2001/2297—Addressing the hologram to an active spatial light modulator using frame sequential, e.g. for reducing speckle noise
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Abstract
The present invention proposes a kind of method for suppressing to calculate holographic speckle noise.This method generates the diffraction optical element and sub-hologram being distributed with random phase respectively, and is correspondingly loaded into reproduction on two SLM.Diffraction optical element can reduce the coherence for reproducing light, and sub-hologram is spatially separated adjacent picture point, passage time multiplexing, realize the suppression of reproduction image speckle noise.
Description
Technical field
The present invention relates to holographic display field, specifically, it is related to a kind of method for suppressing to calculate holographic speckle noise.
Background technology
Speckle noise is one of the reason for reduction calculates holographic reconstructed image quality, in order to lift the quality of reproduction image, at present
Existing a variety of methods for suppressing speckle noise are suggested, and wherein exemplary process has：Iterative method, compared with weak coherent light reproduce method, when
Between the method for average and pixel separation method.Gerchberg-Saxton algorithms are most common iterative algorithms, and this method is calculated by increasing
Method iterations suppresses speckle noise, but with the increase of iterations, convergence is deteriorated, noise suppression effect
It is unobvious.It is using the poor light source of coherence to reproduce method compared with weak coherent light（Such as LED）As light is reproduced, this method can have
Effect ground suppresses speckle noise, but can obscure reproduction image.Time averaging method is also referred to as stochastic averaging, in such method
In, every width record scene is required to make several holograms, then passage time averagely suppress speckle noise, the increase of such method
The computation burden of hologram, and to spatial light modulator（SLM）Refresh rate propose higher requirement, be difficult to realize dynamic
Display.Pixel separation method will be recorded object and be divided into multiple object point groups, be suppressed by reducing the overlapping area of adjacent Aili spot
Speckle noise, such a every width record scene of method still needs to record tens of width holograms, is unfavorable for realizing dynamic holographic display.Cause
This, the research for calculating holographic speckle noise method to effectively suppression is very meaningful.
The content of the invention
The present invention proposes a kind of method for suppressing to calculate holographic speckle noise, and this method is generated with random phase point respectively
The diffraction optical element and sub-hologram of cloth, and correspondingly it is loaded into reproduction on two SLM.Diffraction optical element can reduce reproduction light
Coherence, sub-hologram spatially separated adjacent picture point, passage time multiplexing, realizes reproduction image speckle noise
Suppression.
As shown in Figure 1, the method for the holographic speckle noise of present invention suppression calculating is mainly included the following steps that：
Step one：By the information for being recorded object be stored in matrix map (x,y) in, resolution ratio is denoted asX × Y,x=1、
2......X,y=1、2......Y, the sampling interval between object point is denoted asdx.It is newly-builtN 2Individual resolution ratio isX × YNull matrix,
It is denoted as map1(x,y)-map N 2(x,y), according to formula（1）For null matrix assignment, rem () represents modulo operation, and this formula will be by
Record object and carry out pixel separation, obtainN 2Individual object point group, matrix map1(x,y)-map N 2(x,y) the different object point groups of corresponding record
Information, in same object point group, between adjacent object point at intervals ofNdx.Using fast fourier transform algorithm, correspondence note
Record the information of all object point groups, symbiosis intoN 2Width sub-hologram.
（1）
Step 2：GenerationMN 2Width diffraction optical element, whereinM=1,2,3......, every width diffraction optical element is respectively provided with random
Phase distribution, and the diffraction element be applied to different reconstruction of scenes.
Step 3：Diffraction optical element and sub-hologram are reproduced respectively using two SLM, it is for example attached that it reproduces light path
Shown in Fig. 2, laser is reproduces light source, and wave filter realizes the filtering of laser and expanded that lens are collimated to laser, diffraction optics
Element is loaded into SLM1, sub-hologram is loaded into SLM2.In order to reduce due to light intensity loss caused by SLM configuration, SLM1And SLM2
Reflective structure is used, two SLM refresh rate is adjusted, within human eye vision persistence effect, it is ensured that SLM1Refresh rate
For SLM2Refresh rateMTimes.After the modulation that laser passes through diffraction optical element, become the thin light that there is multi beam random phase to be distributed
Beam, it is reduced as coherence of light is reproduced.For any one width sub-hologram, it can generateMIt is individual with different speckle noises
Sub- reproduction image, according to the statistical property of speckle noise,MIndividual sub- reproduction image is added in intensity, the final sub- reproduction image patch of generation
Spot noise is suppressed,N 2Individual final sub- reproduction image passage time multiplexing produces reproduction image, and in the process, adjacent image points are in space
Above it is separated, therefore the overlapping area of Aili spot is reduced, so as to further suppress the speckle noise in reproduction image.
Brief description of the drawings
The foregoing and additional aspect and advantage of the present invention is incited somebody to action from the detailed description of following combination accompanying drawings and embodiment
It further to define and be readily appreciated that, wherein：
Accompanying drawing 1 is that the inventive method suppresses to calculate the schematic diagram of holographic speckle noise.
Accompanying drawing 2 is the schematic diagram that the inventive method computed hologram reproduces.
Shown by reference numeral in above-mentioned accompanying drawing is：
1 laser, 2 wave filters, 3 lens, 4SLM1, 5SLM2, 6 receiver boards.
It should be appreciated that above-mentioned accompanying drawing is schematical, it is not drawn to draw.
Embodiment
It is right the following detailed description of using a kind of exemplary embodiments for suppressing to calculate holographic speckle noise method of the present invention
The present invention is further described specifically.
The method that the present invention suppresses speckle noise is mainly included the following steps that：
Step one：By the information for being recorded object be stored in matrix map (x,y) in, resolution ratio is 1080 × 1920,x=1、
2......1080,y=1, the sampling interval between 2......1920, object point is denoted asdx.Newly-built 4 resolution ratio is 1080 × 1920
Null matrix, be denoted as map1(x,y)-map4(x,y), according to formula
For null matrix assignment, rem () represents modulo operation, this
Object will be recorded and carry out pixel separation, 4 object point groups, matrix map are obtained1(x,y)-map4(x,y) the different object points of corresponding record
Group information, in same object point group, between adjacent object point at intervals of 2dx.Using fast fourier transform algorithm, correspondence
Record the information of all object point groups, symbiosis is into 4 width sub-holograms.
Step 2：8 width diffraction optical elements are generated, every width diffraction optical element is respectively provided with random phase distribution, and should
Diffraction element is applied to different reconstruction of scenes.
Step 3：Diffraction optical element and sub-hologram are reproduced respectively using two SLM, laser is reproduction light
Source, wave filter realizes the filtering of laser and expanded that lens are collimated to laser, and diffraction optical element is loaded into SLM1, son is entirely
Breath figure is loaded into SLM2.In order to reduce due to light intensity loss caused by SLM configuration, SLM1And SLM2Reflective structure is used, is adjusted
Whole two SLM refresh rate, within human eye vision persistence effect, it is ensured that SLM1Refresh rate be SLM22 times of refresh rate.Swash
After the modulation that light passes through diffraction optical element, become the light pencil that there is multi beam random phase to be distributed, it is concerned with as light is reproduced
Property reduction.For any one width sub-hologram, 2 sub- reproduction images with different speckle noises can be generated, are made an uproar according to spot
The statistical property of sound, 2 sub- reproduction images are added in intensity, and the final sub- reproduction image speckle noise of generation is suppressed, and 4 final
Sub- reproduction image passage time multiplexing produces reproduction image, and in the process, adjacent image points are spatially separated, therefore Aili spot
Overlapping area is reduced, so as to further suppress the speckle noise in reproduction image.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (3)
1. a kind of method for suppressing to calculate holographic speckle noise, it is characterised in that the suppression of speckle noise includes
Step one：By the information for being recorded object be stored in matrix map (x,y) in, resolution ratio is denoted asX × Y,x=1、
2......X,y=1、2......Y, the sampling interval between object point is denoted asdx, object will be recorded and carry out pixel separation, obtainedN 2
Individual object point group, using fast fourier transform algorithm, the information of all object point groups of corresponding record, symbiosis intoN 2Width sub-hologram；
Step 2：GenerationMN 2Width diffraction optical element, whereinM=1,2,3......, every width diffraction optical element is respectively provided with random
Phase distribution, and the diffraction element be applied to different reconstruction of scenes；
Step 3：Diffraction optical element and sub-hologram are reproduced respectively using two SLM, laser is filtered to reproduce light source
Ripple device realizes the filtering of laser and expanded that lens are collimated to laser, and diffraction optical element is loaded into SLM1, sub-hologram adds
It is downloaded to SLM2, suppress the speckle noise in reproduction image.
2. a kind of method for suppressing to calculate holographic speckle noise as claimed in claim 1, it is characterised in that in step one,
It is newly-builtN 2Individual resolution ratio isX × YNull matrix, be denoted as map1(x,y)-map N 2(x,y), according to formulaFor null matrix assignment, rem () represents modulo operation, obtained
Matrix map1(x,y)-map N 2(x,y) the different object point group of corresponding record information, in same object point group, adjacent object point it
Between at intervals ofNdx。
3. a kind of method for suppressing to calculate holographic speckle noise as claimed in claim 1, it is characterised in that in step 3,
In order to reduce due to light intensity loss caused by SLM configuration, SLM1And SLM2Reflective structure is used, two SLM refreshing is adjusted
Rate, within human eye vision persistence effect, it is ensured that SLM1Refresh rate be SLM2Refresh rateMTimes；Laser passes through diffraction optics member
After the modulation of part, become the light pencil that there is multi beam random phase to be distributed, it is reduced as coherence of light is reproduced；For any one
Width sub-hologram, can be generatedMThe individual sub- reproduction image with different speckle noises, according to the statistical property of speckle noise,MHeight
Reproduction image is added in intensity, and the final sub- reproduction image speckle noise of generation is suppressed,N 2Individual final sub- reproduction image passage time
Multiplexing produces reproduction image, and in the process, adjacent image points are spatially separated, therefore the overlapping area of Aili spot is reduced,
So as to further suppress the speckle noise in reproduction image.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946943A (en) * | 2019-04-15 | 2019-06-28 | 北京航空航天大学 | A kind of holographic display system inhibiting speckle noise based on beam shaping |
| CN110032053A (en) * | 2019-03-29 | 2019-07-19 | 北京航空航天大学 | A kind of holo-speckle noise suppressing method based on effective use spatial light modulator |
| CN110095969A (en) * | 2018-10-23 | 2019-08-06 | 郑州轻工业学院 | A method of inhibit to calculate holographic reconstructed image speckle noise based on single SLM |
| CN111240176A (en) * | 2020-03-23 | 2020-06-05 | 郑州轻工业大学 | Large visual area calculation holographic display method with speckle noise suppressed |
| CN111240177A (en) * | 2020-03-04 | 2020-06-05 | 北京航空航天大学 | Holographic speckle noise suppression method based on layered pixel scanning algorithm |
| CN111580372A (en) * | 2020-05-19 | 2020-08-25 | 郑州轻工业大学 | Synthetic CGH (Carrier grade height) -based speckle noise suppressed large visual area calculation holographic display method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976031A (en) * | 2010-08-27 | 2011-02-16 | 昆明理工大学 | Method for optimizing reproduced holographic images of digital micro-mirror |
| CN102063046A (en) * | 2004-12-23 | 2011-05-18 | 视瑞尔技术公司 | Hologram reproduction method of generating an object using a display device |
| CN102323733A (en) * | 2011-07-28 | 2012-01-18 | 浙江师范大学 | Method for eliminating zero-order spot and conjugate image of digital hologram based on partition calculation |
| JP2012113183A (en) * | 2010-11-26 | 2012-06-14 | Dainippon Printing Co Ltd | Hologram reproduction device |
| CN103995455A (en) * | 2014-05-16 | 2014-08-20 | 北京理工大学 | Method for restraining 3D holographic display speckle noise within limited phase variation range |
| CN106200340A (en) * | 2015-06-01 | 2016-12-07 | 三星电子株式会社 | Spatial light modulator and the holographic display including it |
-
2017
- 2017-05-09 CN CN201710322592.2A patent/CN107121917B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063046A (en) * | 2004-12-23 | 2011-05-18 | 视瑞尔技术公司 | Hologram reproduction method of generating an object using a display device |
| CN101976031A (en) * | 2010-08-27 | 2011-02-16 | 昆明理工大学 | Method for optimizing reproduced holographic images of digital micro-mirror |
| JP2012113183A (en) * | 2010-11-26 | 2012-06-14 | Dainippon Printing Co Ltd | Hologram reproduction device |
| CN102323733A (en) * | 2011-07-28 | 2012-01-18 | 浙江师范大学 | Method for eliminating zero-order spot and conjugate image of digital hologram based on partition calculation |
| CN103995455A (en) * | 2014-05-16 | 2014-08-20 | 北京理工大学 | Method for restraining 3D holographic display speckle noise within limited phase variation range |
| CN106200340A (en) * | 2015-06-01 | 2016-12-07 | 三星电子株式会社 | Spatial light modulator and the holographic display including it |
Non-Patent Citations (2)
| Title |
|---|
| M.ABOLHASSANI等: "Speckle noise reduction by division and digital processing of a hologram", 《OPTIK》 * |
| 田青等: "数字全息再现像的激光散斑消除的研究", 《应用激光》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095969A (en) * | 2018-10-23 | 2019-08-06 | 郑州轻工业学院 | A method of inhibit to calculate holographic reconstructed image speckle noise based on single SLM |
| CN110095969B (en) * | 2018-10-23 | 2021-03-16 | 郑州轻工业学院 | Method for suppressing speckle noise of computed holography reconstruction image based on single SLM |
| CN110032053A (en) * | 2019-03-29 | 2019-07-19 | 北京航空航天大学 | A kind of holo-speckle noise suppressing method based on effective use spatial light modulator |
| CN109946943A (en) * | 2019-04-15 | 2019-06-28 | 北京航空航天大学 | A kind of holographic display system inhibiting speckle noise based on beam shaping |
| CN109946943B (en) * | 2019-04-15 | 2020-04-10 | 北京航空航天大学 | Holographic display system for inhibiting speckle noise based on beam shaping |
| CN111240177A (en) * | 2020-03-04 | 2020-06-05 | 北京航空航天大学 | Holographic speckle noise suppression method based on layered pixel scanning algorithm |
| CN111240176A (en) * | 2020-03-23 | 2020-06-05 | 郑州轻工业大学 | Large visual area calculation holographic display method with speckle noise suppressed |
| CN111580372A (en) * | 2020-05-19 | 2020-08-25 | 郑州轻工业大学 | Synthetic CGH (Carrier grade height) -based speckle noise suppressed large visual area calculation holographic display method |
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