CN110068935A - A kind of microspur laser speckle generation device and method - Google Patents
A kind of microspur laser speckle generation device and method Download PDFInfo
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- CN110068935A CN110068935A CN201810061862.3A CN201810061862A CN110068935A CN 110068935 A CN110068935 A CN 110068935A CN 201810061862 A CN201810061862 A CN 201810061862A CN 110068935 A CN110068935 A CN 110068935A
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- speckle
- light
- laser
- doe
- speckle pattern
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
- G02B27/4227—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant in image scanning systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
This disclosure relates to a kind of microspur laser speckle generation device and method, described device includes laser emitter, collimating mirror, optical diffraction device DOE, focus lamp；The laser emitter, collimating mirror, the spacing between four components of optical diffraction device DOE and focus lamp is adjustable, and the tilt adjustable of four components；Wherein: the light that collimating mirror is issued through laser emitter forms parallel rays；The parallel rays diffraction is gone out speckle point by optical diffraction device DOE, forms speckle pattern；Speckle pattern is reduced in focus lamp focusing.The speckle pattern contrast for the device projection that the disclosure proposes is higher, and uniformity is more preferable, can be applied to microspur range, especially in terms of medical treatment, if oral cavity is scanned, and endoscope etc.；Industrial aspect, small space short distance three-dimensional imaging application etc..
Description
Technical field
This disclosure relates to which artificial intelligence, biologic medical, technique of laser imaging field, are related to a kind of microspur laser speckle generation
Device and method.
Background technique
Along with increasingly mature and camera shooting industry the high speed development of photography technology, the function of camera module is also no longer only
It is confined to commonly take pictures, such as camera module and structured light projector are combined together, in three-dimensional reconstruction, recognition of face and security protection
Field has all obtained large-scale application, but is constrained to the camera depth of field, the factors such as the projector and camera module volume, domestic
Outer microspur (operating distance 3-8CM) can pass through also in blank stage, microspur laser projecting apparatus to the projections such as object or scene
The light of specific compiling is crossed, then is obtained by macro mould group by the light of the reflections such as object or scene, for closely
The calculating of object high accuracy depth information, to realize to the 3-D scanning of closer object or scene, 3D modeling or three-dimensional
It rebuilds.Depth perception method based on laser speckle structure light encoding and decoding is because its reliability is high, anti-noise ability is strong, precision is high etc.
Advantage is widely studied and applies.The existing laser speckle projector can only operate in over 20cm, in microspur work Shi Yifang
Face can only obtain minimal amount of speckle point, on the other hand excessive in the presence of the scattered speck area projected, the coding pattern projected
Effect is poor, is unable to satisfy the microspur three-dimensional imaging demand in the fields such as oral cavity scanning, endoscope.The projection of microspur speckle mainly faces height
Technical bottlenecks and the challenges such as resolution ratio, high-resolution show, limited field constraint, the microspur range depth of field are wide.
Summary of the invention
In consideration of it, present disclose provides a kind of microspur laser speckle generation device and method, including light source, collimating mirror, light
Diffractive optical element DOE (Diffractive Optical Elements), focus lamp are learned, generated coding pattern line focus is thrown
Penetrate, output can microspur imaging high-resolution, high-resolution laser speckle encoding pattern, meet microspur structure optical mode group three-dimensional measurement
Requirement.
On the one hand, the present disclosure proposes a kind of microspur laser speckle generation device, described device includes laser emitter, standard
Straight mirror, optical diffraction device DOE, focus lamp；
The laser emitter, collimating mirror, the spacing between four components of optical diffraction device DOE and focus lamp is adjustable,
And the tilt adjustable of four components；Wherein:
The light that collimating mirror is issued through laser emitter forms parallel rays；
The parallel rays diffraction is gone out speckle point by optical diffraction device DOE, forms speckle pattern；
Speckle pattern is reduced in focus lamp focusing；
Successively collimated mirror, optical diffraction device DOE, focus lamp, formation laser dissipate the light of the laser transmitter projects
Spot projects on target object.
In said device, in which: the collimating mirror is synthesized to the back side of optical diffraction device DOE, makes laser emitter
The light of sending forms speckle pattern after passing through DOE.
In said device, in which: described device includes reflecting mirror and camera；
Speckle pattern is reflected into target object by the reflecting mirror, and by the reflected light back of target object to camera.
In said device, in which: the reflecting mirror is gold-plated.
In said device, in which: the laser emitter includes LD laser emitter or VCSEL point source emitters.
On the other hand, present disclose provides a kind of microspur laser speckle production method, the method includes the following steps:
S100, the light of laser transmitter projects is transformed into directional light；
S200, the directional light is diffracted to speckle point, forms speckle pattern；
S300, it after being reduced the speckle pattern, projects on target object.
In the method, in which: the method includes the following steps:
S400 and the speckle pattern for acquiring target object reflection.
In the method, in which: the step S400 includes the following steps:
Reflective mirror is set in the optical path of throw light, and is reflected the light that target object reflects into taking the photograph using reflective mirror
As head.
Detailed description of the invention
Fig. 1 is the structural block diagram of microspur laser speckle projector device of the invention；
Fig. 2 is the cross-sectional view of microspur laser speckle projector device of the invention；
Fig. 3 is the cross-sectional view that the microspur laser speckle projector of the invention is used in combination with reflecting mirror and camera；
Fig. 4 is the schematic diagram that light passes through collimating mirror；
Fig. 5 is the schematic diagram that a directional light passes through optical diffraction device；
Fig. 6 is the schematic diagram that laser speckle pattern passes through focus lamp.
Specific embodiment
In one embodiment it is proposed that a kind of microspur laser speckle generation device, as depicted in figs. 1 and 2, described device
Wherein 6 projector structural schematic diagram is represented, 5 represent assembly, and 4 represent laser emitter, and 3 represent collimating mirror, and 2, which represent optics, spreads out
Emitter part DOE, 1 represents focus lamp.Four laser emitter, collimating mirror, optical diffraction device DOE and focus lamp components it
Between spacing it is adjustable, and the tilt adjustable of four components；Wherein: the light that collimating mirror is issued through laser emitter forms flat
Row light；The parallel rays diffraction is gone out speckle point by optical diffraction device DOE, forms speckle pattern；Focus lamp focusing will dissipate
Spot pattern is reduced；The light of the laser transmitter projects successively collimated mirror, optical diffraction device DOE, focus lamp are formed
Laser speckle projects on target object.
In this embodiment, the laser emitter includes LD laser emitter or VCSEL point source emitters.It can be with
The collimating mirror is synthesized to the back side of optical diffraction device DOE, the light for issuing laser emitter is dissipated by being formed after DOE
Spot pattern.In order to ensure being able to achieve microspur imaging, laser emitter, collimating mirror, optical diffraction device DOE, focus lamp this four
Spacing between component is adjustable, four components X, Y, Z axis direction tilt adjustable, to realize that the microspur range depth of field is adjustable
Purpose.
Preferably, described device includes reflecting mirror and camera；Speckle pattern is reflected into target object by the reflecting mirror,
And by the reflected light back of target object to camera.The speckle pattern reduced after focusing is reflected on object by reflecting mirror, is connect
Again be reflected on reflecting mirror, after being reflected by a reflector again, by camera receive carry out microspur imaging.Preferably, institute
It is gold-plated to state reflecting mirror.Fig. 3 is the cross-sectional view that the microspur laser speckle projector of the invention is used in combination with reflecting mirror and camera,
Wherein 3-1 represents optical path of the speckle pattern from the projector to reflecting mirror, and 3-2 represents the optical path from reflecting mirror to target object, 3-3
The optical path from target object to reflecting mirror is represented, 3-4 is represented from reflecting mirror to the optical path for receiving camera.
In this embodiment, as shown in figure 4, being emitted beam by laser emitter across collimating mirror, so that the light of diverging
Line is parallel, becomes a directional light.As shown in figure 5, point directional light diffraction after DOE goes out a large amount of speckle point, forms laser and dissipate
Spot pattern, the laser speckle pattern projected are by certain rule design, meet random distribution and window uniqueness requirement
Arrangement, the coding pattern being made of speckle dot matrix are used for structural light three-dimensional depth measurement after the pattern projection.As shown in fig. 6, spreading out
The speckle pattern generated after penetrating realizes that projected speckle encoding pattern integrally reduces after focus lamp focuses, that is, keeps coding
Pattern form is constant, dissipates spot size and speckle point spacing scaled down.Scheme a0 such as to focus preceding speckle spot diameter, a1 is poly-
Defocused speckle spot diameter, b0 are the spacing before focusing between two of them speckle dot center point, and b1 is to correspond to two after focusing to dissipate
Spacing between spot centers point, the diminution ratio of a0/a1 are equal to the diminution ratio of b0/b1.
In one embodiment, a kind of microspur laser speckle production method is provided, the method includes the following steps:
S100, the light of laser transmitter projects is transformed into directional light；
S200, the directional light is diffracted to speckle point, forms speckle pattern；
S300, it after being reduced the speckle pattern, projects on target object.
When in use, the method also includes following step:
The speckle pattern that S400, acquisition target object reflect.
Preferably, the step S400 includes the following steps:
Reflective mirror is set in the optical path of throw light, and is reflected the light that target object reflects into taking the photograph using reflective mirror
As head.
For microspur involved in the disclosure, numberical range is 2CM~15CM.
Although embodiment of the present invention is described in conjunction with attached drawing above, the invention is not limited to above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted
's.Those skilled in the art are under the enlightenment of this specification and in the range for not departing from the claims in the present invention and being protected
In the case where, a variety of forms can also be made, these belong to the column of protection of the invention.
Claims (8)
1. a kind of microspur laser speckle generation device, which is characterized in that described device includes laser emitter, collimating mirror, optics
Diffractive optical element DOE, focus lamp；
The laser emitter, collimating mirror, the spacing between four components of optical diffraction device DOE and focus lamp is adjustable, and four
The tilt adjustable of a component；Wherein:
The light that collimating mirror is issued through laser emitter forms parallel rays；
The parallel rays diffraction is gone out speckle point by optical diffraction device DOE, forms speckle pattern；
Speckle pattern is reduced in focus lamp focusing；
The light of the laser transmitter projects successively throw by collimated mirror, optical diffraction device DOE, focus lamp, formation laser speckle
It is mapped on target object.
2. the apparatus according to claim 1, it is characterised in that: it is preferred,
The collimating mirror is synthesized to the back side of optical diffraction device DOE, and the light for issuing laser emitter after DOE by forming
Speckle pattern.
3. the apparatus according to claim 1, it is characterised in that:
Described device further includes reflecting mirror and camera；
Speckle pattern is reflected into target object by the reflecting mirror, and by the reflected light back of target object to camera.
4. the apparatus according to claim 1, it is characterised in that:
The reflecting mirror is gold-plated.
5. the apparatus according to claim 1, it is characterised in that:
The laser emitter further includes LD laser emitter or VCSEL point source emitters.
6. a kind of microspur laser speckle production method, which is characterized in that the method includes the following steps:
S100, the light of laser transmitter projects is transformed into directional light；
S200, the directional light is diffracted to speckle point, forms speckle pattern；
S300, it after being reduced the speckle pattern, projects on target object.
7. according to the method described in claim 6, it is characterized in that, the method includes the following steps:
The speckle pattern that S400, acquisition target object reflect.
8. the method according to the description of claim 7 is characterized in that the step S400 includes the following steps:
Reflective mirror is set in the optical path of throw light, and is reflected the light that target object reflects into camera shooting using reflective mirror
Head.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810061862.3A CN110068935A (en) | 2018-01-22 | 2018-01-22 | A kind of microspur laser speckle generation device and method |
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| CN201810061862.3A CN110068935A (en) | 2018-01-22 | 2018-01-22 | A kind of microspur laser speckle generation device and method |
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| CN201810061862.3A Pending CN110068935A (en) | 2018-01-22 | 2018-01-22 | A kind of microspur laser speckle generation device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111443497A (en) * | 2020-05-13 | 2020-07-24 | 浙江水晶光电科技股份有限公司 | Laser projection module, depth imaging device and conversion lens selection method |
| CN112333428A (en) * | 2020-10-26 | 2021-02-05 | 浙大网新科技股份有限公司 | AI-based large-view monitoring processing method and system for common camera |
| CN112713486A (en) * | 2019-10-25 | 2021-04-27 | 海罗尼克株式会社 | Operating method of multipoint laser generating device, laser generating device and laser system |
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| JP2000233529A (en) * | 1998-12-17 | 2000-08-29 | Fuji Photo Film Co Ltd | Imaging optical system |
| CN107209008A (en) * | 2015-01-31 | 2017-09-26 | 微软技术许可有限责任公司 | Structured light pattern generation |
| CN205191308U (en) * | 2015-12-11 | 2016-04-27 | 高准精密工业股份有限公司 | Light -emitting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713486A (en) * | 2019-10-25 | 2021-04-27 | 海罗尼克株式会社 | Operating method of multipoint laser generating device, laser generating device and laser system |
| CN111443497A (en) * | 2020-05-13 | 2020-07-24 | 浙江水晶光电科技股份有限公司 | Laser projection module, depth imaging device and conversion lens selection method |
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| CN112333428A (en) * | 2020-10-26 | 2021-02-05 | 浙大网新科技股份有限公司 | AI-based large-view monitoring processing method and system for common camera |
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