CN108241278A - A kind of making of computed hologram and reproducting method - Google Patents
A kind of making of computed hologram and reproducting method Download PDFInfo
- Publication number
- CN108241278A CN108241278A CN201611215507.4A CN201611215507A CN108241278A CN 108241278 A CN108241278 A CN 108241278A CN 201611215507 A CN201611215507 A CN 201611215507A CN 108241278 A CN108241278 A CN 108241278A
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- Prior art keywords
- hologram
- object light
- light wave
- sampling
- computer
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000006854 communication Effects 0.000 claims description 3
- 238000000609 electron-beam lithography Methods 0.000 claims description 3
- 238000002164 ion-beam lithography Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000005428 wave function Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
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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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0866—Digital holographic imaging, i.e. synthesizing holobjects from holograms
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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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0891—Processes or apparatus adapted to convert digital holographic data into a hologram
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holo Graphy (AREA)
Abstract
Making and reproducting method the invention discloses a kind of computed hologram, are related to hologram image processing technology field, including following four step：Sampling, calculating, coding, storage and the reproduction of object light information.A kind of making for computed hologram that the present invention passes through offer and reproducting method, in the case of ensureing that reproduction effective information is constant, it is possible to reduce reproduce the record of waste information, then hologram calculation amount can be reduced, so as to promote the formation speed of computed hologram.
Description
Technical field
The present invention relates to hologram image processing technology field, the making of especially a kind of computed hologram and reproducting method.
Background technology
Computed hologram is a kind of widely applied holographic format, and recording beam path is similar to traditional optical holography, but
The recording device of hologram uses CCD camera or CMOS cameras.Computed hologram can also be done by normal image by simulated optical
The process of relating to obtains.Reproduction image can use computer to carry out digital reproduction, can also print on hologram on transparent material and pass through
Necessary processing is crossed, then optical reproduction.The defects of poor to the effect of hologram image progress reproduction image processing in the prior art.
Invention content
A kind of making of computed hologram proposed by the present invention and reproducting method have the reproduction effects for realizing hologram image
The second best in quality advantage.
The technical proposal of the invention is realized in this way：
A kind of making of computed hologram and reproducting method, include the following steps：
1) sampling of object light information obtains the value of object or corrugated on discrete sampling point, i.e., by the continuous letter of wavefront information
Number is converted to a discrete function, and the wave function of simulation object is directly inputted computer or using the modes pair such as shooting and scanning
Object existing for reality carries out data acquisition；
2) calculate, object function number of sampling points be more than hologram plane on number of sampling points under the premise of, pass through computer
Calculate optical field distribution of the Object light wave in hologram plane, in particular to from object to hologram plane, in the communication process of Object light wave,
The COMPLEX AMPLITUDE of light field of the Object light wave in hologram plane is calculated by computer disposal；
3) it encodes, the COMPLEX AMPLITUDE for the Object light wave being incident on holographic facet is encoded to the distribution of hologram transmitance.Entirely
Breath figure can only record non-negative real value data, and it is " locking " phase information to calculate holographic purpose, is generally realized by two methods：
Detour phase encoding and modified off-axis coded reference waves.
4) storage, it is necessary to carry out the storage of hologram after complex amplitude coding, is generally adopted to computerized control and be painted with reproducing
Figure equipment draws out artwork, and carries out that dimension of picture is appropriate to be zoomed in or out, and is recorded on photographic negative, obtained by shooting
Suitable hologram.Amplitude type computed hologram can also generally use laser scanning recording device, pattern generator, optical plotter etc.
It is made；Kinoform can be made of ion/electron beam lithography machine, litho machine etc..
A kind of making for computed hologram that the present invention passes through offer and reproducting method, advantage are：Ensure again
In the case of existing effect Information invariability, it is possible to reduce reproduce the record of waste information, then hologram calculation amount can be reduced, so as to carry
Rise the formation speed of computed hologram.
Specific embodiment
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
It is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
The present embodiment provides
A kind of making of computed hologram and reproducting method, including following four step：The sampling of object light information, calculating,
Coding, storage and reproduction.
1) sampling of object light information obtains the value of object or corrugated on discrete sampling point, i.e., by the continuous letter of wavefront information
Number is converted to a discrete function, and the wave function of simulation object is directly inputted computer or using the modes pair such as shooting and scanning
Object existing for reality carries out data acquisition.
It is distributed to revert to a continuous two-dimension light field by the two-dimensional sampling value of a light wave fields, it should which selection is reasonable
Sampling interval because number of sampling points can cause a large amount of calculating and storage too much, so as to into image strip come it is difficult；And it samples
The loss that points will lead to a large amount of object light information very little influences the quality of reproduction image.Therefore, the only rational sampling interval,
Information can not be also lost neither to calculating and generating burden into figure equipment.And it in order to avoid there is the situation of spectral aliasing, takes out
Sample interval must satisfy sampling theorem.The sampling number of holographic plan superior function cannot be fewer than the sampling number of object function and object
Space-bandwidth product must be no less than number of sampling points, and relational expression can represent as follows：
MN≤ΔxΔyΔfxΔfy
The space width of △ x and △ y, that is, objects in above formula, and △ fxWith △ fyFrequency bandwidth is represented, M and N are respectively then
Number of sampling points in X-direction and Y-direction.
2) calculate, object function number of sampling points be more than hologram plane on number of sampling points under the premise of, pass through computer
Calculate optical field distribution of the Object light wave in hologram plane, in particular to from object to hologram plane, in the communication process of Object light wave,
The COMPLEX AMPLITUDE of light field of the Object light wave in hologram plane is calculated by computer disposal
3) it encodes, the COMPLEX AMPLITUDE for the Object light wave being incident on holographic facet is encoded to the distribution of hologram transmitance.Entirely
Breath figure can only record non-negative real value data, and it is " locking " phase information to calculate holographic purpose, is generally realized by two methods：
Detour phase encoding and modified off-axis coded reference waves.
If the expression formula of Object light wave is：
O (x, y)=AO(x, y) exp [j φ (x, y)]
Generally using plane light wave, expression formula is reference light wave：
R (x, y)=AR(x, y) exp [j2 π α x]
Some unessential invariants are got rid of, under conditions of linear recording, the transmittance function of off-axis gaussian beam
It can be expressed as：
In above formula It is DC component, they can be ignored.And function Section 3 is for making meter
Hologram is calculated, it contains all information of Object light wave.
4) storage, it is necessary to carry out the storage of hologram after complex amplitude coding, is generally adopted to computerized control and be painted with reproducing
Figure equipment draws out artwork, and carries out that dimension of picture is appropriate to be zoomed in or out, and is recorded on photographic negative, obtained by shooting
Suitable hologram.Amplitude type computed hologram can also generally use laser scanning recording device, pattern generator, optical plotter etc.
It is made；Kinoform can be made of ion/electron beam lithography machine, litho machine etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (1)
1. making and the reproducting method of a kind of computed hologram, which is characterized in that include the following steps：
1) sampling of object light information obtains the value of object or corrugated on discrete sampling point, i.e., is turned by the continuous function of wavefront information
A discrete function is changed to, the wave function of simulation object is directly inputted computer or using the modes such as shooting and scanning to reality
Existing object carries out data acquisition；
2) calculate, object function number of sampling points be more than hologram plane on number of sampling points under the premise of, calculated by computer
Optical field distribution of the Object light wave in hologram plane, in particular to from object to hologram plane, in the communication process of Object light wave, passes through
Computer disposal calculates the COMPLEX AMPLITUDE of light field of the Object light wave in hologram plane；
3) it encodes, the COMPLEX AMPLITUDE for the Object light wave being incident on holographic facet is encoded to the distribution of hologram transmitance.Hologram
Non-negative real value data can only be recorded, it is " locking " phase information to calculate holographic purpose, is generally realized by two methods：Detour
Phase code and modified off-axis coded reference waves.
4) storage, it is necessary to carry out the storage of hologram after complex amplitude coding, is generally set with reproducing using computer-directed drawing
It is standby to draw out artwork, and carry out that dimension of picture is appropriate to be zoomed in or out, it is recorded on photographic negative, is suitble to by shooting
Hologram.Amplitude type computed hologram can also generally be carried out with laser scanning recording device, pattern generator, optical plotter etc.
It makes；Kinoform can be made of ion/electron beam lithography machine, litho machine etc..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611215507.4A CN108241278A (en) | 2016-12-26 | 2016-12-26 | A kind of making of computed hologram and reproducting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611215507.4A CN108241278A (en) | 2016-12-26 | 2016-12-26 | A kind of making of computed hologram and reproducting method |
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| Publication Number | Publication Date |
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| CN108241278A true CN108241278A (en) | 2018-07-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161826A (en) * | 2019-05-17 | 2019-08-23 | 金陵科技学院 | A kind of algorithm for computing holography |
| CN110495900A (en) * | 2019-08-19 | 2019-11-26 | 武汉联影医疗科技有限公司 | Image display method, device, equipment and storage medium |
| CN110908264A (en) * | 2019-12-17 | 2020-03-24 | 南京萃智激光应用技术研究院有限公司 | Method for directly writing holographic anti-counterfeiting pattern by using ultrashort pulse laser |
| CN116931363A (en) * | 2023-09-18 | 2023-10-24 | 光科芯图(北京)科技有限公司 | Mask optimization method, device and exposure equipment |
-
2016
- 2016-12-26 CN CN201611215507.4A patent/CN108241278A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161826A (en) * | 2019-05-17 | 2019-08-23 | 金陵科技学院 | A kind of algorithm for computing holography |
| CN110495900A (en) * | 2019-08-19 | 2019-11-26 | 武汉联影医疗科技有限公司 | Image display method, device, equipment and storage medium |
| CN110908264A (en) * | 2019-12-17 | 2020-03-24 | 南京萃智激光应用技术研究院有限公司 | Method for directly writing holographic anti-counterfeiting pattern by using ultrashort pulse laser |
| CN116931363A (en) * | 2023-09-18 | 2023-10-24 | 光科芯图(北京)科技有限公司 | Mask optimization method, device and exposure equipment |
| CN116931363B (en) * | 2023-09-18 | 2023-11-21 | 光科芯图(北京)科技有限公司 | Mask optimization method, device and exposure equipment |
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Application publication date: 20180703 |