CN105982752A - Intracavity object surface large-visual-field 3D imaging system - Google Patents
Intracavity object surface large-visual-field 3D imaging system Download PDFInfo
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- CN105982752A CN105982752A CN201510052823.3A CN201510052823A CN105982752A CN 105982752 A CN105982752 A CN 105982752A CN 201510052823 A CN201510052823 A CN 201510052823A CN 105982752 A CN105982752 A CN 105982752A
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Abstract
The invention discloses an intracavity object surface large-visual-field 3D imaging system, which, by conducting computation in accordance with an active triangulation principle, can acquire 3D structural information of an object. In order to adapt to an oral application, a reflector is arranged at the front end of the imaging system; and in order to design a larger visual field, a convex reflector or a beam expanding/shrinking optical mirror group is adopted by the imaging system disclosed by the invention. The system is particularly suitable for optical digital impression application to the dental field; and the system is also applicable to acquisition of intracavity optical 3D digital impression or intracavity imaging systems in other fields.
Description
Technical field
Patent of the present invention describes a kind of intracavity body surface big visual field 3D imaging system, is adaptable to dental field imaging.
Background technology
In dental field, oral cavity, the acquisition of the 3D model of image tooth is Dental Erosion one crucial step of operation.Some universal methods have dental impressions technology or tooth optics die technology now.Dental impressions technology has disadvantages that, such as, use inconvenience, causes sense of discomfort to patient, precision it is difficult to ensure that etc..Tooth optics die uses optical measuring technique to carry out dental impressions acquisition, it is not necessary to directly contact object, and precision is high, and this technology is increasingly becoming mainstream technology.Tooth optics die technology typically uses active triangulation principle, and this technology calculates the three-dimensional position of corresponding point by calculating the intersection point of two-beam line.
In dentistry optics die field, maintain the leading position is Xi Nuode company, its equipment cardinal principle is active triangulation, it uses linearly polarized light beam that measured object is irradiated and then is measured, but owing to its linearly polarized light beam uses electromagnetic pressure machinery structure or LCD to drive and obtain reference picture pattern, the problem that there is limited precision due to frame for movement precision, and its LCD contrast used is low, poor linearity, so there is the problem that certainty of measurement is low, measurement result is unstable.Later, Xi Nuode company, in order to improve the problem of the poor linearity of LCD illumination, puts forward to use repetitive measurement, average measurements, reduce PERIODIC INTERFERENCE during measurement, but the method may require that and repeatedly illuminates capture, and there is the problem that calculating error is big, so the time of measurement is long, also has the factor such as relative motion of measuring device and user, error rate is high, causes measuring unsuccessfully, and this will bring a lot of inconvenience for practical operation.These methods there is also an issue, that is contemplated to the visual field of system of taking into account, optical design and computation complexity, typically the visual field of system can be designed as >=12mm*16mm, and it is bigger that this allows for system bulk, result in system in use, patient has sense of discomfort.
Patent of the present invention describes a kind of intracavity body surface big visual field 3D imaging system, and this imaging system utilizes active triangulation principle to calculate, and then obtains the 3D structural information of object.
Summary of the invention
For reducing the volume of dentistry optics die system, the visual field of increase system, patent of the present invention describes the body surface 3D imaging system of the big visual field of a kind of intracavity, and this imaging system utilizes projector to produce multiframe structure light, and structure light irradiates target object through projecting light path；The reflection light of object, through imaging optical path, enters camera, and camera obtains the image of object；Utilize active triangulation principle to calculate, and then obtain the 3D structural information of object.In order to adapt to oral application, this imaging system front end need be equipped with reflecting mirror, in order to design bigger visual field, this patent use convex reflecting mirror or expand, contracting beam optics mirror group.
Patent of the present invention provides the benefit that, this simple in construction of this imaging system, can meet the body surface 3D imaging applications of the big visual field of intracavity.
Accompanying drawing explanation
The present invention is further described with enforcement below in conjunction with the accompanying drawings.
Fig. 1 describes a kind of 3D imaging system according to principle of triangulation；In Fig. 1,1 represents Measuring Object；2 represent projected light；3 reflection light.
Fig. 2 describes the structure chart of intracavity 3D optical imaging system；In Fig. 2,1 represents object being measured；2 represent camera；3 reflecting mirrors；4 represent projector.
Fig. 3 illustrates two kinds of optical structure charts of intracavity body surface big visual field 3D optical imaging system；In Fig. 3 .a, 1 represents plane mirror, and 2 expressions expand, contracting beam optics mirror group；In Fig. 3 .b, 1 represents convex reflecting mirror.
Fig. 4 represents the two kinds of reflecting mirrors that can use；Fig. 4 .a represents one direction convex reflecting mirror；Fig. 4 .b represents convex reflecting mirror.
Detailed description of the invention
Patent of the present invention describes a kind of intracavity body surface big visual field 3D imaging system, and this imaging system utilizes projector to produce multiframe structure light, and structure light irradiates target object through projecting light path；The reflection light of object, through imaging optical path, enters camera, and camera obtains the image of object；Utilize active triangulation principle to calculate, and then obtain the 3D structural information of object.In order to adapt to oral application, this imaging system front end need be equipped with reflecting mirror, in order to design bigger visual field, this patent use convex reflecting mirror or expand, contracting beam optics mirror group.
In FIG, a kind of 3D imaging system according to principle of triangulation is described.In Fig. 1,2 represent projected light, and projected light is produced by projector, and projected light is object 1 in projecting light path is irradiated to Fig. 1.In Fig. 1,3 represent that the reflection light of objects, reflection light enter in camera through imaging optical path, camera imaging.Through projection sequence structure light and camera repeatedly imaging, the three dimensional structure of object can be calculated according to principle of triangulation, and then carry out three-dimensional imaging.
Fig. 2 illustrates the structure chart of intracavity 3D optical imaging system.Projector 4, according to input picture generating structure light, through projecting light path, is irradiated on object being measured 1 through reflecting mirror 3.The reflection light of object is through reflecting mirror 3, through imaging optical path, imaging on camera 2.Through multiple projections structure light sequence and repeatedly imaging, it is thus achieved that corresponding structure light irradiates the structure light image of object, utilizes principle of triangulation, it is possible to obtain the 3D structural information of current object.
Due to the maximum tolerance precision in the oral cavity measured the chances are 100 microns, owing to during measuring, other steps may bring uncertain factor, if so the precision of dental 3D imaging system can reach 25 microns, then meet oral application.There is various bending and uneven surface in the object owing to measuring, blocks to take into account precision and light, and the angle of projecting light path's central optical path and imaging optical path central optical path typically requires less than ten degree, this measurement angle such as the α in Fig. 2.Measuring angle the most relevant with certainty of measurement, it is 2 degree to 10 degree that an acceptable measures angular range.
Fig. 3 illustrates two kinds of optical structure charts of intracavity body surface big visual field 3D optical imaging system.In figure, solid line represents projector light path, and dotted line represents imaging optical path.Fig. 3 .a represents that system front end uses plane mirror, and in Fig. 3 .a, 1 represents plane mirror, in Fig. 3 .a 2 represent expand, contracting beam optics mirror group, owing to expanding, the effect of beam-shrinked mirror group, this imaging system can also increase visual field.Fig. 3 .b represents that system front end uses convex reflecting mirror.Characteristic according to convex reflecting mirror and optical reflection principle, we are readily available after convex reflecting mirror, and the projection illumination area of projector and the imaging area of camera are all by increase.
Fig. 4 represents the two kinds of reflecting mirrors that can use.Fig. 4 .a represents one direction convex reflecting mirror；Fig. 4 .b represents convex reflecting mirror.
The present invention solve its technical problem use technical scheme:
(1) according to systematic parameter requirement, optical system is designed according to Fig. 3 .a or Fig. 3 .b；Wherein Fig. 3 .a represents that employing expands, contracting beam optics mirror group to be to realize large view field measurement；Fig. 3 .b uses convex mirror to realize large view field measurement；Can also use simultaneously expand, contracting beam optics mirror group and convex mirror to be to realize large view field measurement；
(2) utilizing projector specific structure light, structure light is irradiated on object through projection optical system；
(3) camera is utilized to shoot subject image；
(4) utilize the camera demarcated and projector data, use principle of triangulation to obtain the optics 3D die of object；
(5) if optics die can not cover the body surface of requirement, capture angle can be adjusted, repeat (2)-(4), it is thus achieved that the optics 3D die of another angle；
(6) by registration integration technology, the 3D optics die repeatedly obtained is generated a complete object optical 3D die.
Patent of the present invention provides the benefit that, system utilize convex reflecting mirror or expand, beam-shrinked mirror group achieves intracavity object big visual field 3D imaging system, simple in construction.
Claims (8)
1. an intracavity body surface big visual field 3D imaging system, this imaging system utilizes projector to produce multiframe structure light, and structure light irradiates target object through projecting light path；The reflection light of object, through imaging optical path, enters camera, and camera obtains the image of object；Utilize active triangulation principle to calculate, and then obtain the 3D structural information of object；In order to adapt to oral application, this imaging system front end need be equipped with reflecting mirror, in order to design bigger visual field, this patent use convex mirror or expand, contracting beam optics mirror group.
2. according to the system described by claim 1, it is characterised in that this system comprises projecting light path and imaging optical path, say, that comprise two set optical systems: projection optical system and imaging optical system.
3. according to the system described by claim 1, it is characterised in that this system, in order to reach to measure the purpose of object surface structure in oral cavity, uses reflecting mirror in imaging system front end.
4. according to the system described by claim 1, it is characterised in that projecting light path's central optical path measure angular range formed with imaging optical path central optical path is 2 degree to 10 degree.
5. according to the system described by claim 1, it is characterised in that system have employed convex reflecting mirror to expand the visual field of system.
6. according to the system described by claim 1, it is characterised in that system also use expand, contracting beam optics mirror group to be to expand the visual field of system.
7. according to the system described by claim 1, it is characterised in that system also use convex reflecting mirror and expand, the combination of contracting beam optics mirror group to be to expand the visual field of system.
8. according to the system described by claim 1, it is characterised in that this system can be applied and obtain at dentistry optics die, but also apply be applicable in the application that other tracavity optical dies obtain.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022104492A1 (en) * | 2020-11-17 | 2022-05-27 | 西安大医集团股份有限公司 | Optical monitoring system and radiotherapy equipment |
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| CN102762142A (en) * | 2010-02-12 | 2012-10-31 | 皇家飞利浦电子股份有限公司 | Laser enhanced reconstruction of 3d surface |
| CN102954770A (en) * | 2011-08-15 | 2013-03-06 | 佳能株式会社 | Three-dimensional measurement apparatus, three-dimensional measurement method |
| US20150164621A1 (en) * | 1996-09-02 | 2015-06-18 | Orametrix, Inc. | Method and device for carrying out optical pickup |
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| US20150164621A1 (en) * | 1996-09-02 | 2015-06-18 | Orametrix, Inc. | Method and device for carrying out optical pickup |
| US7751971B2 (en) * | 2007-01-17 | 2010-07-06 | Microsoft Corporation | Location mapping for key-point based services |
| CN102762142A (en) * | 2010-02-12 | 2012-10-31 | 皇家飞利浦电子股份有限公司 | Laser enhanced reconstruction of 3d surface |
| CN102954770A (en) * | 2011-08-15 | 2013-03-06 | 佳能株式会社 | Three-dimensional measurement apparatus, three-dimensional measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022104492A1 (en) * | 2020-11-17 | 2022-05-27 | 西安大医集团股份有限公司 | Optical monitoring system and radiotherapy equipment |
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Application publication date: 20161005 |