CN100560024C - A kind of tooth geometrical shape measurement device - Google Patents
A kind of tooth geometrical shape measurement device Download PDFInfo
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- CN100560024C CN100560024C CNB2008100618992A CN200810061899A CN100560024C CN 100560024 C CN100560024 C CN 100560024C CN B2008100618992 A CNB2008100618992 A CN B2008100618992A CN 200810061899 A CN200810061899 A CN 200810061899A CN 100560024 C CN100560024 C CN 100560024C
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Abstract
The invention discloses a kind of tooth geometrical shape measurement device, comprise light source, image generating unit, projecting cell and image-generating unit; Light source sends incident illumination and is mapped to the image generating unit, the image generating unit produces netted geometric figure image, projecting cell alternately projects the netted geometric figure image of the different separately distortion of formation on the dental surface with the angle of the symmetrical triangle netted geometric figure image that shape is identical, netted geometric figure image by the dental surface distortion that two width of cloth are different reflexes in the image-generating unit, and the netted geometric figure image of the distortion that two width of cloth are different is transferred to outer computer, the projection ray of projecting cell projection is ± 10 °～± 30 ° with perspective angle range between the imaging light that reflects from dental surface, characteristics are only to need lower driving voltage with the programmable graphics generator (LCOS) that adopts, and LCOS can produce any figure that is used for the computer generated image algorithm, makes netted geometric figure image have higher resolution simultaneously.
Description
Technical field
The present invention relates to a kind of optical measuring device, especially relate to a kind of tooth geometrical shape measurement device.
Background technology
The optical measuring device that has occurred many patients of being used for oral cavity inner teeth gear at present, CEREC (the Chair-side Economic Reconstruction of Esthetic Ceramic that makes as the Sirona company that separates from Siemens, digitized clinical repair system) device, this device adopts graphic projection's commercial measurement technology of generally using, the parallel grid of light and dark linear striped is incident upon on the surface of tooth, and with the parallax angle be imaged on the two dimension CCD (Charge Coupled Device, charge-coupled image sensor) on the photographing unit, can obtain the relative altitude or the relative depth of tooth from the curvature of linear striped, the digital image data of tooth adopts and utilizes the phase shift of sinusoidal grating or phase place analytic technique to handle; Wherein, the phase place of linear striped moves 0 °, 90 °, 180 ° or 270 ° of acquisitions by displacement bimorph method or additive method, thereby obtains the relative phase of the every bit on the parallel grid; And reduce or eliminated the background noise and the intensity disturbance of linear striped by filtering or smoothing technique.This device can for tooth reconstruction CAD/CAM (the Computer Aided Design that must use, computer-aided design/Computer Aided Manufacturing, computer aided manufacturing) processing provides digital image data preferably, and need not to do tooth model.But there is significant disadvantages in this device: a) because the coherence of light utilizes the phase shift analytic technique of sinusoidal grating seriously to be limited by speckle point situation, cause the high blur of the digitized video of tooth thus; B) this device reduces or has eliminated the background noise and the intensity disturbance of linear striped by filtering or smoothing technique, but greatly reduces the resolution of the digitized video of tooth simultaneously; C) the phase shift analytic technique is applied in the fixed parallel grid, (differing greater than 2 π) when the height of tooth is undergone mutation to cause linear fringe shift greater than the net distance, need more projection or change net apart from compensating this defective, thereby make that the structure of this device is more complicated, caused the uncertainty of digital image data simultaneously.
Except above-mentioned shortcoming, there is common defective in the optical measuring device that comprises above-mentioned CEREC device, because the parallax angle is a very important parameter, the parallax angle is big more, and then the sensitivity of Ce Lianging is just high more, but shadow problem is just serious more simultaneously, in order to eliminate shade as much as possible, optical measuring device is selected usually less than 10 °, even littler parallax angle, but has greatly reduced the certainty of measurement of tooth like this.
Summary of the invention
Technical problem to be solved by this invention provides a kind of compact conformation, cost is low, power consumption is little, long service life, and can improve netted geometric figure image resolution, measure sensitivity and precision, effectively avoid netted geometric figure image the tooth geometrical shape measurement device of shade to occur.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of tooth geometrical shape measurement device, this device comprise light source, image generating unit, projecting cell and image-generating unit; Described light source sends incident illumination and is mapped to described image generating unit, described image generating unit produces netted geometric figure image, described projecting cell alternately projects the netted geometric figure image of the different separately distortion of formation on the dental surface with the angle of the symmetrical triangle netted geometric figure image that shape is identical, netted geometric figure image by the dental surface distortion that two width of cloth are different reflexes in the described image-generating unit, the netted geometric figure image of the distortion that described image-generating unit is different with two width of cloth is transferred to outer computer, calculate the tooth profile by described outer computer according to known phase bit stripping algorithm or rendering algorithm, described projecting cell projects the projection ray of dental surface and the perspective angle range that reflexes to from dental surface between the imaging light of described image-generating unit is ± 10 °～± 30 °.
Described image generating unit comprises programmable graphics generator and the polarization splitting prism that is connected with outer computer, described projecting cell comprises projecting lens, become polarization state spectroscope and reflecting mirror, described change polarization state spectroscope and described reflecting mirror are distributed in the both sides of described image-generating unit, described image-generating unit comprises imaging len and imaging camera, the incident illumination that described light source sends shines on the described programmable graphics generator by described polarization splitting prism, described programmable graphics generator generates netted geometric figure image, the netted geometric figure image of described polarization splitting prism output polarization, and be transferred to described change polarization state spectroscope by projecting lens, described change polarization state spectroscope alternately changes and projects dental surface by described reflecting mirror after the angle of polarization makes polarising netted geometric figure image project dental surface or transmission, the light of the light of described change polarization state spectroscope projection and the projection of described reflecting mirror is the angle of symmetrical triangle, and the light that reflects from dental surface images in the described imaging camera by described imaging len.
Described change polarization state spectroscope is the Electronic Control liquid crystal shutter.
Described image generating unit comprises the programmable graphics generator that is connected with outer computer, be provided with illuminating lens between described light source and the described programmable graphics generator, described projecting cell comprises projecting lens, first prism, scanning lens, second prism, prism, first gradient lens, second gradient lens, the first gradient lens object lens, the 4th prism, second gradient lens object lens and the pentaprism, described image-generating unit comprises the 6th prism, the 3rd gradient lens, the 4th gradient lens, imaging len and imaging camera, described second prism is a polarization splitting prism, the incident illumination that described light source sends shines on the described programmable graphics generator by described illuminating lens, described programmable graphics generator alternately generates the first identical netted geometric figure image of shape and the second netted geometric figure image, the described first netted geometric figure image and the described second netted geometric figure image have orthogonal polarization state, the described second prismatic reflection described first netted geometric figure image and the transmission described second netted geometric figure image, the described first netted geometric figure image is by described first gradient lens, described first gradient lens object lens and described the 4th prism project the first netted geometric figure image that dental surface forms distortion, the described second netted geometric figure image is by described prism, described second gradient lens, described second gradient lens object lens and described pentaprism project the second netted geometric figure image that dental surface forms distortion, and the second netted geometric figure image of first netted geometric figure image of described distortion and described distortion passes through described the 6th prism from the dental surface reflection, described the 3rd gradient lens, described the 4th gradient lens and described imaging len image in the described imaging camera.
Described programmable graphics generator be miniature electronic find a view type the reflective type silicon-based liquid crystal array or be the reflective type silicon-based liquid crystal sheet of projector type.
Described programmable graphics generator is the digital light process chip.
Described light source is a white light source, and described imaging camera is RGB (Red Green Blue, a RGB) photographing unit.
Described light source is LED (Light Emitting Diode, light emitting diode) lamp or a laser instrument, and described imaging camera is a monochromatic camera.
Compared with prior art, the invention has the advantages that with programmable graphics generator (LCOS, Liquid Crystal onSilicon) substitutes existing displacement bimorph method, make this measuring device compact conformation, cost is low, power consumption is little, long service life, LCOS only needs lower driving voltage, and LCOS can produce any figure that is used for the computer generated image algorithm, simultaneously higher than having with existing transmission-type liquid crystalline phase netted geometric figure image resolution; Projecting cell projects the projection ray of dental surface and the perspective angle range that reflexes to from dental surface between the imaging light of image-generating unit is ± 10 °～± 30 °, make the netted geometric figure image of the distortion that two width of cloth are different form down big perspective angle (can spend) greater than 30, not only avoid the netted geometric figure image of distortion the phenomenon of shade to occur effectively, and improved the measurement sensitivity and the precision of tooth; The netted geometric figure image of the distortion of obtaining by this measuring device is 24: 23: 12 with the image ratio in the computer of tooth reconstruction system: the phase bit stripping algorithm of 6 ratios is handled, and forms thick, accurate measurement amount, has avoided the uncertainty of data.
Description of drawings
Fig. 1 is the structural representation one of measuring device of the present invention;
Fig. 2 is the structural representation two of measuring device of the present invention;
Fig. 3 is the sketch map one of the tooth reconstruction system of application measuring device of the present invention;
Fig. 4 is the sketch map two of the tooth reconstruction system of application measuring device of the present invention.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one: as shown in Figure 1, a kind of tooth geometrical shape measurement device, this device comprise light source 1, image generating unit, projecting cell and image-generating unit; The image generating unit comprises programmable graphics generator 3 and the polarization splitting prism 2 that outer computer connects, projecting cell comprises projecting lens 41, become polarization state spectroscope 42 and reflecting mirror 43, become the both sides that polarization state spectroscope 42 and reflecting mirror 43 are distributed in image-generating unit, image-generating unit comprises imaging len 51 and imaging camera 52, the incident illumination that light source 1 sends shines on the programmable graphics generator 3 by polarization splitting prism 2, programmable graphics generator 3 generates netted geometric figure image, netted geometric figure image by polarization splitting prism 2 output polarizations, by projecting lens 41 polarising netted geometric figure image is transferred to again and becomes polarization state spectroscope 42, become and alternately to change the angle of polarization in 42 milliseconds in the polarization state spectroscope and make polarising netted geometric figure image project after the surface of tooth 6 or the transmission the netted geometric figure image that the surface that projects tooth 6 by reflecting mirror 43 forms the different separately distortion of two width of cloth, the light of change polarization state spectroscope 42 projections and the light of reflecting mirror 43 projections are the angle of symmetrical triangle, the netted geometric figure image of the distortion that two width of cloth on the surface of tooth 6 are different separately images in the imaging camera 52 by imaging len 51, the netted geometric figure image of the distortion that imaging camera 52 is different separately with two width of cloth is transferred to outer computer, calculates the tooth profile by outer computer according to known phase bit stripping algorithm or rendering algorithm; Projecting cell project tooth 6 the surface projection ray and be ± 10 °～± 30 ° from the surface reflectance of tooth 6 to the perspective angle range the imaging light of image-generating unit, the netted geometric figure image of the distortion that two width of cloth are different separately forms down big perspective angle (can spend greater than 30), not only avoid the netted geometric figure image of distortion the phenomenon of shade to occur effectively, and improved the measurement sensitivity and the precision of tooth.
Change polarization state spectroscope 42 in the present embodiment is the Electronic Control liquid crystal shutter.
Fig. 3 has provided the sketch map of using the tooth reconstruction system of measuring device of the present invention, the netted geometric figure image that generates with programmable graphics generator in the measuring device of the present invention 7 that computer 8 is connected is after the projection and imaging of measuring device 7, the netted geometric figure image that is recorded in the distortion in the imaging camera returns to computer 8 by USB (Universal SerialBus, USB (universal serial bus)) data wire; The netted geometric figure image of 8 pairs of distortions of computer is 24: 23: 12 with the image ratio: the phase bit stripping algorithm of 6 ratios is adjusted processing, and according to sophisticated triangulation technique, the three-dimensional surface computer of tooth is gone out, draw the tooth profile simultaneously, and the tooth profile is sent into milling machine 9 with wireless mode; Milling machine 9 is produced pottery, porcelain according to the tooth profile, or people's formula tooth, the corona of synthetic material, have a denture made, obedient tooth etc.Wherein, in measuring device 7 outer setting the special power subsystem 71 that power supply is provided for light source (LED lamp), programmable graphics generator (LCOS) and imaging camera is arranged.Wherein, be 24: 23: 12 with the image ratio: the phase bit stripping algorithm of 6 ratios is handled the netted geometric figure image of distortion, can form essence, accurate measurement amount like this, avoids the uncertainty of data.
Fig. 4 has provided the another kind of sketch map of using the tooth reconstruction system of measuring device of the present invention, different with Fig. 3 is to communicate with wireless mode between computer 8 and the measuring device 7, has guaranteed effectively also can not communicate smoothly under the usb data line situation having; In addition, saved power subsystem 71, internal battery in measuring device 7 is that light source (LED lamp), programmable graphics generator (LCOS) and imaging camera in the measuring device 7 provides power supply by battery, make like this measuring device structure more simply, more compact.
Embodiment two: as shown in Figure 2, only be that the image generating unit comprises the programmable graphics generator 3 that outer computer connects outside present embodiment and embodiment one are different, be provided with illuminating lens 11 between light source 1 and the programmable graphics generator 3, projecting cell comprises projecting lens 41, first prism 441, scanning lens 45, second prism 442, prism 443, first gradient lens 461, second gradient lens 462, the first gradient lens object lens 471, the 4th prism 444, second gradient lens object lens 472 and the pentaprism 445, image-generating unit comprises the 6th prism 446, the 3rd gradient lens 463, the 4th gradient lens 464, imaging len 51 and imaging camera 52, the second prisms 442 are polarization splitting prism; The incident illumination that light source 1 sends shines on the programmable graphics generator 3 by illuminating lens 11, programmable graphics generator 3 alternately generates the first identical netted geometric figure image of shape and the second netted geometric figure image, the first netted geometric figure image and the second netted geometric figure image have orthogonal polarization state, the first netted geometric figure image that will alternately generate simultaneously and the second netted geometric figure image are by projecting lens 41, first prism 441 and scanning lens 45 are transferred to second prism 442, second prism 442 reflects the first netted geometric figure images and the transmission second netted geometric figure image, the first netted geometric figure image is by first gradient lens 461, the surface that the first gradient lens object lens 471 and the 4th prism 444 project tooth 6 forms the first netted geometric figure image that twists, the second netted geometric figure image is by prism 443, second gradient lens 462, the surface that the second gradient lens object lens 472 and pentaprism 445 project tooth 6 forms the second netted geometric figure image that twists, and first netted geometric figure image of distortion and the second netted geometric figure image of distortion pass through the 6th prism 446 from the surface reflectance of tooth 6, the 3rd gradient lens 463, the 4th gradient lens 464 and imaging len 51 image in the imaging camera 52.
The size of the measuring device of present embodiment is littler, and its diameter can be less than 3 millimeters.
Claims (5)
1, a kind of tooth geometrical shape measurement device is characterized in that this device comprises light source, image generating unit, projecting cell and image-generating unit; Described light source sends incident illumination and is mapped to described image generating unit, described image generating unit produces netted geometric figure image, described projecting cell alternately projects the netted geometric figure image of the different separately distortion of formation on the dental surface with the angle of the symmetrical triangle netted geometric figure image that shape is identical, netted geometric figure image by the dental surface distortion that two width of cloth are different reflexes in the described image-generating unit, the netted geometric figure image of the distortion that described image-generating unit is different with two width of cloth is transferred to outer computer, calculate the tooth profile by described outer computer according to known phase bit stripping algorithm or rendering algorithm, described projecting cell projects the projection ray of dental surface and the perspective angle range that reflexes to from dental surface between the imaging light of described image-generating unit is ± 10 °～± 30 °; Described image generating unit comprises the programmable graphics generator that is connected with outer computer, be provided with illuminating lens between described light source and the described programmable graphics generator, described projecting cell comprises projecting lens, first prism, scanning lens, second prism, prism, first gradient lens, second gradient lens, the first gradient lens object lens, the 4th prism, second gradient lens object lens and the pentaprism, described image-generating unit comprises the 6th prism, the 3rd gradient lens, the 4th gradient lens, imaging len and imaging camera, described second prism is a polarization splitting prism, the incident illumination that described light source sends shines on the described programmable graphics generator by described illuminating lens, described programmable graphics generator alternately generates the first identical netted geometric figure image of shape and the second netted geometric figure image, the described first netted geometric figure image and the described second netted geometric figure image have orthogonal polarization state, the described second prismatic reflection described first netted geometric figure image and the transmission described second netted geometric figure image, the described first netted geometric figure image is by described first gradient lens, described first gradient lens object lens and described the 4th prism project the first netted geometric figure image that dental surface forms distortion, the described second netted geometric figure image is by described prism, described second gradient lens, described second gradient lens object lens and described pentaprism project the second netted geometric figure image that dental surface forms distortion, and the second netted geometric figure image of first netted geometric figure image of described distortion and described distortion passes through described the 6th prism from the dental surface reflection, described the 3rd gradient lens, described the 4th gradient lens and described imaging len image in the described imaging camera.
2, a kind of tooth geometrical shape measurement device according to claim 1, it is characterized in that described programmable graphics generator be miniature electronic find a view type the reflective type silicon-based liquid crystal array or be the reflective type silicon-based liquid crystal sheet of projector type.
3, a kind of tooth geometrical shape measurement device according to claim 1 is characterized in that described programmable graphics generator is the digital light process chip.
4, a kind of tooth geometrical shape measurement device according to claim 1 is characterized in that described light source is a white light source, and described imaging camera is the RGB photographing unit.
5, a kind of tooth geometrical shape measurement device according to claim 1 is characterized in that described light source is LED lamp or laser instrument, and described imaging camera is a monochromatic camera.
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| CNB2008100618992A CN100560024C (en) | 2008-05-23 | 2008-05-23 | A kind of tooth geometrical shape measurement device |
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| CNB2008100618992A CN100560024C (en) | 2008-05-23 | 2008-05-23 | A kind of tooth geometrical shape measurement device |
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| CN101288590A CN101288590A (en) | 2008-10-22 |
| CN100560024C true CN100560024C (en) | 2009-11-18 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102008282B (en) * | 2010-10-29 | 2012-08-08 | 深圳大学 | Number stamp intraoral scanner and oral cavity internal surface topography image real-time reconstructing system |
| CN105125312B (en) * | 2014-05-27 | 2017-02-15 | 财团法人金属工业研究发展中心 | Intraoral scanning apparatus |
| CN106491082B (en) * | 2016-10-11 | 2020-09-18 | 明基智能科技（上海）有限公司 | Three-dimensional profile scanner |
| EP3367054B1 (en) * | 2017-02-28 | 2020-05-06 | Phenospex B.V. | Device for optically recording objects |
| CN110017796B (en) * | 2019-05-16 | 2021-09-03 | 西安工业大学 | High-precision gear tooth surface optical measurement method |
| CN110974470B (en) * | 2019-12-31 | 2020-08-07 | 山东大学齐鲁医院 | Positioning device for tooth treatment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372502A (en) * | 1988-09-02 | 1994-12-13 | Kaltenbach & Voight Gmbh & Co. | Optical probe and method for the three-dimensional surveying of teeth |
| CN1236431A (en) * | 1996-09-02 | 1999-11-24 | 叙林克斯医学技术有限公司 | Optical imaging method and device |
| CN1748120A (en) * | 2003-02-06 | 2006-03-15 | 株式会社高永科技 | Thrre-dimensional image measuring apparatus |
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- 2008-05-23 CN CNB2008100618992A patent/CN100560024C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372502A (en) * | 1988-09-02 | 1994-12-13 | Kaltenbach & Voight Gmbh & Co. | Optical probe and method for the three-dimensional surveying of teeth |
| CN1236431A (en) * | 1996-09-02 | 1999-11-24 | 叙林克斯医学技术有限公司 | Optical imaging method and device |
| CN1748120A (en) * | 2003-02-06 | 2006-03-15 | 株式会社高永科技 | Thrre-dimensional image measuring apparatus |
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