CN110260821B - Optical module based on fringe projection and three-dimensional analysis system - Google Patents
Optical module based on fringe projection and three-dimensional analysis system Download PDFInfo
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- CN110260821B CN110260821B CN201910450672.5A CN201910450672A CN110260821B CN 110260821 B CN110260821 B CN 110260821B CN 201910450672 A CN201910450672 A CN 201910450672A CN 110260821 B CN110260821 B CN 110260821B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 238000004141 dimensional analysis Methods 0.000 title claims abstract description 17
- 238000005286 illumination Methods 0.000 claims abstract description 11
- 230000005499 meniscus Effects 0.000 claims description 8
- 230000007547 defect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2518—Projection by scanning of the object
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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
- G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
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- Computer Vision & Pattern Recognition (AREA)
- Optics & Photonics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the technical field of three-dimensional scanning, and discloses an optical module based on fringe projection and a three-dimensional analysis system. Optical module based on fringe projection, including setting gradually: a light source for radiating a beam of light; the illumination unit is used for converging, collimating and homogenizing the light beams radiated by the light source to generate uniform light spots; the light modulator is used for modulating the uniform light spots generated by the illumination unit to generate a bar-shaped pattern; and the rectangular diaphragm projection lens is used for projecting the bar-shaped patterns generated by the modulation of the light modulator to a target surface. Compared with the defect that the brightness can be reduced when the depth of field is improved by the traditional circular diaphragm, the depth of field of projection is improved on the premise of ensuring the projection brightness so as to adapt to scanning application scenes with different depth of field, and the three-dimensional scanning accuracy and the application range of the optical module are improved.
Description
Technical Field
The invention relates to the technical field of three-dimensional scanning, in particular to an optical module based on fringe projection and a three-dimensional analysis system.
Background
With the rapid development and maturity of optical three-dimensional measurement technology, three-dimensional digitization is beginning to be widely applied to the fields of three-dimensional scanners, face recognition, virtual reality equipment and the like. At present, the fringe projection technology is mainly used for three-dimensional scanning, and in the three-dimensional scanning process, because an object is a solid and has a spatial depth, the scanning depth of field of an optical system needs to be analyzed.
The projection depth of field of the conventional strip projection assembly which usually adopts a fixed-focus lens and a circular diaphragm is small, and the use requirements of various application scenes cannot be met. If the depth of field needs to be increased, only the size of the aperture can be reduced, but reducing the aperture can result in a loss of energy and thus insufficient brightness. The use is influenced by too small depth of field and too low brightness, and the application range of the bar-shaped projection component is limited. The zoom lens has a complex structure and a large volume, and is not suitable for various application scenes.
Disclosure of Invention
In view of this, the present invention provides an optical module and a three-dimensional analysis system based on fringe projection, which solve the technical problem that the projection depth of field of the conventional stripe projection module is small and the application range is affected.
According to an embodiment of the present invention, there is provided an optical module based on fringe projection, including: a light source for radiating a beam of light; the illumination unit is used for converging, collimating and homogenizing the light beams radiated by the light source to generate uniform light spots; the light modulator is used for modulating the uniform light spots generated by the illumination unit to generate a bar-shaped pattern; and the rectangular diaphragm projection lens is used for projecting the bar-shaped patterns generated by the modulation of the light modulator to a target surface.
Preferably, the rectangular diaphragm projection lens comprises a lens barrel, a ring pressing ring, and a positive focal power biconvex lens, a rectangular diaphragm, a negative focal power biconcave lens, a positive focal power biconvex lens and a negative focal power meniscus lens which are sequentially arranged in the lens barrel.
Preferably, the rectangular diaphragm is correspondingly provided with a positioning screw.
Preferably, the annular pressing ring is arranged between the positive focal power biconvex lens, the rectangular diaphragm, the negative focal power biconcave lens, the positive focal power biconvex lens and the negative focal power meniscus lens.
Preferably, the rectangular diaphragm projection lens is configured such that the direction of the short side of the rectangular diaphragm is perpendicular to the stripe pattern generated by the light modulator.
Preferably, the length of the long side of the rectangular diaphragm is close to the inner diameter of the lens barrel.
Preferably, the centers of the positive-power biconvex lens, the rectangular diaphragm, the negative-power biconcave lens, the positive-power biconvex lens and the negative-power meniscus lens are located on the axis of the lens barrel.
Preferably, the outer wall of the lens barrel of the rectangular diaphragm projection lens is further provided with a positioning screw.
According to another embodiment of the present invention, there is also provided a fringe projection-based three-dimensional analysis system, including the above fringe projection-based optical module and a three-dimensional analysis unit, where the three-dimensional analysis unit is configured to analyze a bar pattern of the fringe projection-based optical module on a target surface according to a preset algorithm to obtain three-dimensional information.
The invention provides an optical module based on fringe projection and a three-dimensional analysis system, which sequentially comprise: a light source for radiating a beam of light; the illumination unit is used for converging, collimating and homogenizing the light beams radiated by the light source to generate uniform light spots; the light modulator is used for modulating the uniform light spots generated by the illumination unit to generate a bar-shaped pattern; and the rectangular diaphragm projection lens is used for projecting the bar-shaped patterns generated by the modulation of the light modulator to a target surface. The length of the long side of the rectangular diaphragm is configured to be as long as possible and close to the inner diameter of the lens barrel, so that enough light can penetrate through the rectangular diaphragm as far as possible to ensure the projection brightness, and meanwhile, the length of the short side of the rectangular diaphragm is configured to be as short as possible, so that the aperture of the diaphragm is reduced as far as possible to improve the projection depth of field. Compared with the defect that the brightness can be reduced when the depth of field is improved by the traditional circular diaphragm, the depth of field of projection is improved on the premise of ensuring the projection brightness so as to adapt to scanning application scenes with different depth of field, and the three-dimensional scanning accuracy and the application range of the optical module are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of an optical module based on fringe projection according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a rectangular diaphragm projection lens in an embodiment of the present invention.
Fig. 3 is a schematic dot-matrix diagram of a rectangular diaphragm projection lens according to an embodiment of the present invention.
Fig. 4 is a schematic MTF curve diagram of a rectangular diaphragm projection lens according to an embodiment of the present invention.
FIG. 5 is a schematic diagram of distortion of a rectangular-diaphragm projection lens according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a three-dimensional analysis system according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described in more detail with reference to the accompanying drawings and the detailed description. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 is a schematic structural diagram of an optical module based on fringe projection according to an embodiment of the present invention. As shown in the figure, the optical module 100 based on fringe projection includes a light source 1, an illumination unit 2, a light modulator 3, and a rectangular diaphragm projection lens 4, which are sequentially arranged.
In this embodiment, the light source 1 may be a point light source, which can radiate a light beam. The illumination unit 2 performs convergence, collimation and dodging on the light beams radiated by the light source 1 to generate uniform light spots. The light modulator 3 modulates the uniform light spot generated by the illumination unit 2 to generate a stripe pattern.
In this embodiment, the rectangular diaphragm projection lens 4 may project the bar pattern generated by the modulation of the light modulator 3 onto a target surface. Referring to fig. 2, the rectangular diaphragm projection lens 4 includes a lens barrel 41, an annular pressing ring 42, and a positive-power biconvex lens 43, a rectangular diaphragm 44, a negative-power biconcave lens 45, a positive-power biconvex lens 46, and a negative-power meniscus lens 47 sequentially disposed in the lens barrel 41. The annular pressing ring 42 is arranged among the positive focal power biconvex lens 43, the rectangular diaphragm 44, the negative focal power biconcave lens 45, the positive focal power biconvex lens 46 and the negative focal power meniscus lens 47, and is used for fixing the lenses and ensuring the distance between the lenses.
In this embodiment, the rectangular diaphragm projection lens 4 adopts four spherical lenses, and compared with the design of eight spherical and aspheric combined lenses of the existing general projection lens, the rectangular diaphragm projection lens has the advantages of simpler structure, easy assembly, lighter overall weight, simpler processing and lower cost. Meanwhile, referring to fig. 3 to 5, the test data of the optical indexes such as modulation transfer function parameters (MTF), diffuse speckles, resolution, distortion and the like of the rectangular diaphragm projection lens 4 are significantly better.
In the present embodiment, according to the theoretical relationship that the size of the projection diaphragm is inversely proportional to the depth of field of projection, the length of the long side of the rectangular diaphragm 44 is configured to be as long as possible and close to the inner diameter of the lens barrel 41, so as to allow enough light to pass through as long as possible and ensure the projection brightness, and the length of the short side thereof is configured to be as short as possible, so as to reduce the aperture of the diaphragm as far as possible and improve the depth of field of projection. Compared with the traditional circular diaphragm, the rectangular diaphragm 44 of the present embodiment improves the projection depth of field on the premise of ensuring the projection brightness, so as to adapt to the scanning application scenes with different depth of field, and improve the accuracy and application range of the three-dimensional scanning of the optical module.
In the present embodiment, the short side direction of the rectangular aperture 44 is perpendicular to the stripe pattern stripes generated by the light modulator 3, and finally the parallel and equally spaced stripe patterns are projected onto the target surface. The rectangular diaphragm 44 is correspondingly provided with a positioning screw to prevent the rectangular diaphragm 44 from being assembled in the lens barrel 41 to rotate, so that the condition that the optical performance is influenced and dirt is brought by rotation is avoided. Meanwhile, the outer wall of the lens barrel 41 of the rectangular diaphragm projection lens 4 is further provided with a positioning screw for positioning to ensure that the short side direction of the rectangular diaphragm 44 is perpendicular to the direction of the projection stripe after assembly.
Referring to fig. 6, on the basis of the above embodiment, the embodiment of the present invention further provides a three-dimensional analysis system 300 based on fringe projection, which includes the optical module 100 based on fringe projection and the three-dimensional analysis unit 200 in the above embodiment. The three-dimensional analysis unit 200 analyzes the bar pattern of the optical module 100 based on fringe projection on the target surface according to a preset algorithm to obtain three-dimensional information. Compared with the defect that the brightness can be reduced when the depth of field is improved by a circular diaphragm in a traditional fringe projection optical system, the depth of field of projection is improved on the premise of ensuring the projection brightness, so that the method is suitable for scanning application scenes with different depth of field, and the accuracy and the application range of three-dimensional scanning of a three-dimensional analysis system are improved.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. The utility model provides an optical module based on fringe projection which characterized in that, including setting gradually:
a light source for radiating a beam of light;
the illumination unit is used for converging, collimating and homogenizing the light beams radiated by the light source to generate uniform light spots;
the light modulator is used for modulating the uniform light spots generated by the illumination unit to generate a bar-shaped pattern; and
the rectangular diaphragm projection lens is used for projecting the bar-shaped patterns generated by the modulation of the optical modulator to a target surface, and comprises a lens barrel, a ring pressing ring, and a positive focal power biconvex lens, a rectangular diaphragm, a negative focal power biconcave lens, a positive focal power biconvex lens and a negative focal power meniscus lens which are sequentially arranged in the lens barrel, wherein the ring pressing ring is arranged between the positive focal power biconvex lens, the rectangular diaphragm, the negative focal power biconcave lens, the positive focal power biconvex lens and the negative focal power meniscus lens, the rectangular diaphragm projection lens is configured to be perpendicular to the bar-shaped patterns generated by the optical modulator in the direction of the short side of the rectangular diaphragm, and the length of the long side of the rectangular diaphragm is close to the inner diameter of the lens barrel.
2. The fringe projection-based optical module of claim 1, wherein the rectangular diaphragm is correspondingly provided with a set screw.
3. The fringe projection-based optical module of claim 1, wherein centers of the positive-power biconvex lens, the rectangular diaphragm, the negative-power biconcave lens, the positive-power biconvex lens, and the negative-power meniscus lens are on an axial center line of the lens barrel.
4. The fringe projection-based optical module of claim 1, wherein a set screw is further disposed on an outer wall of the lens barrel of the rectangular-diaphragm projection lens.
5. A fringe projection-based three-dimensional analysis system, comprising the fringe projection-based optical module of any one of claims 1-4 and a three-dimensional analysis unit, wherein the three-dimensional analysis unit is configured to analyze the stripe pattern of the fringe projection-based optical module on a target surface according to a preset algorithm to obtain three-dimensional information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910450672.5A CN110260821B (en) | 2019-05-28 | 2019-05-28 | Optical module based on fringe projection and three-dimensional analysis system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910450672.5A CN110260821B (en) | 2019-05-28 | 2019-05-28 | Optical module based on fringe projection and three-dimensional analysis system |
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| CN110260821B true CN110260821B (en) | 2021-11-23 |
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| CN112945090B (en) * | 2020-12-11 | 2023-04-21 | 深圳市菲森科技有限公司 | Calibration device and calibration method of three-dimensional measurement system |
| CN114111634A (en) * | 2021-11-12 | 2022-03-01 | 先临三维科技股份有限公司 | Structured light projection module and three-dimensional scanning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100494887C (en) * | 2006-05-22 | 2009-06-03 | 北京航空航天大学 | Sinusoidal stripe structured light projection device based on acousto-optic deflector |
| JP2009198719A (en) * | 2008-02-20 | 2009-09-03 | Olympus Imaging Corp | Zoom lens and imaging device using the same |
| CN104991329B (en) * | 2015-05-22 | 2017-08-25 | 福建浩蓝光电有限公司 | A kind of high-resolution projection lens for industry 3D scanning systems |
| CN104930986B (en) * | 2015-06-17 | 2019-09-24 | 泉州师范学院 | A kind of projection and camera system for measuring three-dimensional morphology |
| CN206369893U (en) * | 2016-12-01 | 2017-08-01 | 广西师范大学 | A kind of fringe projection camera lens for three-dimensional measurement |
| CN108267832A (en) * | 2016-12-30 | 2018-07-10 | 中国空气动力研究与发展中心超高速空气动力研究所 | A kind of one camera dual wavelength frame imaging camera lens |
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