CN102374992A - Diamond identity characteristic identification method and system device - Google Patents
Diamond identity characteristic identification method and system device Download PDFInfo
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- CN102374992A CN102374992A CN2010102477394A CN201010247739A CN102374992A CN 102374992 A CN102374992 A CN 102374992A CN 2010102477394 A CN2010102477394 A CN 2010102477394A CN 201010247739 A CN201010247739 A CN 201010247739A CN 102374992 A CN102374992 A CN 102374992A
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Abstract
The invention provides a diamond identity characteristic fingerprint spatial frequency spectrum analysis identification method based on optical Fourier transform and a diamond identity characteristic detection analysis identification system device based on the method. The method comprises the following steps of: illuminating the diamond table-board by adopting a parallel light beam, carrying out optical Fourier transform on light reflected by the diamond cutting face by using a lens, obtaining spatial frequency spectrum information of the diamond cutting surface from the back focal surface of the lens, collecting spatial frequency spectrum signal images of the diamond cutting surface by using a CCD (Charge Coupled Device) imaging system and inputting the spatial frequency spectrum signal images into a computer for storage management, and comparing the spatial frequency spectrum signal images with diamond spatial frequency spectrum signal images stored in a computer database to realize detection analysis identification to diamond identity characteristic. The diamond identity characteristic fingerprint spatial frequency spectrum analysis identification method and and system device disclosed by the invention are used for storing and managing diamond identity characteristic information, thereby being capable of effectively striking diamond smuggling and stealing actions and enhancing management to diamond imports and exports of customhouse.
Description
Technical field
The present invention relates to the diamond signature analysis and the identity authentication in jewelry field, comprise a kind ofly being used as the authentication method that diamond form fingerprint characteristic is analyzed with spatial frequency spectrum, and based on the diamond signature analysis identification systems device of this method.
Background technology
Diamond is described as " king of jewel " with its rareness, preciousness, hard speciality and diamond culture of long standing and well established.Present international and domestic diamond industry smuggling is rampant, and counterfeit and shoddy goods are a lot, and the diamond larceny case also takes place again and again, and these are broken laws and commit crime how effectively to hit containment, are problems that presses for solution.
At present, the technical research of both at home and abroad diamond being carried out Analysis and Identification is divided into three levels.First level is relatively simple, comprise diamond observation reflected light and growing point, Hardness Surveillance, carry out conductivity test, and carry out chemical constitution test etc., be the analytical approach of using the earliest.Second level is that diamond is identified recognition technology relatively reliably, comprises measurement features spectrum, refractive index, birefringent characteristic etc., and also extensively adopting these methods today.The 3rd level is that more advanced diamond is analyzed authenticate technology; Comprise cathodoluminescence technique, X-ray diffraction technology, Raman spectroscopy, neutron activation analysis technology etc.; Can realize the accurate evaluation to the diamond materials composition, the measurement of correlation instrument is also relatively more expensive.
These diamond authenticate technology emphasis of introducing above are at the substance characteristics of analyzing diamond; And it is considerably less to the analysis of diamond geometry characteristic; Can say so, the space geometry architectural feature that in the diamond of a hundreds of thousands riot of color, is difficult to find out 2 diamonds is duplicate.Therefore, diamond space geometry architectural feature can be used as one of important evidence of diamond identity authentication.Considerably less to the analysis and research of how much appearance structure characteristic fingerprints of diamond surface both at home and abroad at present.
The collimated laser beam vertical irradiation is on diamond table, and the spatial frequency spectrum of surface reflection is corresponding one by one with its surface geometry characteristic, has good specificity and space invariance.With out of Memory (like owner, the place of production, produce time, weight etc.), the database that typing is special just can be used as the diamond identity characteristic information with the graph of spatial frequency spectrum of diamond.When needs are confirmed the diamond identity, as long as obtain the space characteristics frequency spectrum of diamond with detecting instrument, then with database in the diamond identity characteristic information that writes down compare, just can identify the identity of diamond.Therefore, utilize diamond space geometry architectural feature spectrum information can strengthen the management that diamond is imported and exported, effectively hit the lawbreaking activities of diamond smuggling.
Summary of the invention
The invention provides a kind of diamond identity characteristic fingerprint spatial frequency spectrum analytical approach based on optical Fourier transformation, and based on the diamond identity characteristic fingerprint detection Analysis and Identification system and device of this method.
Diamond identity characteristic fingerprint spatial frequency spectrum analytical approach of the present invention adopts parallel beam illumination diamond table; Through lens the reflected light of diamond cut surface is carried out optical Fourier transformation; Back focal plane at lens obtains the catoptrical spatial frequency spectrum of diamond cut surface; Collect the catoptrical spatial frequency spectrum strength signal of diamond cut surface image input computing machine through a CCD imaging system then and carry out storage administration; Carry out the spatial frequency spectrum intensity image relatively by computing machine at last, realize diamond identity characteristic fingerprint detection Analysis and Identification.
In order to realize the spatial frequency spectrum Analysis and Identification of diamond identity characteristic fingerprint; The present invention has made up a kind of diamond identity characteristic fingerprint spatial frequency spectrum check and analysis system and device, comprises four parts such as light-source illuminating system, spatial frequency spectrum generation system, spatial frequency spectrum image acquisition system, Analysis and Identification software systems; Said spatial frequency spectrum generation system includes a light source and at least makes said light source become the lens of directional light; Said spatial frequency spectrum generation system comprises lens or the lens combination and the receiving screen that are constituted jointly by a plurality of lens at least; Receiving screen is positioned on the back focal plane of lens or lens combination; The reflected light of diamond surface is focused on the receiving screen through lens or lens combination, forms the spatial frequency spectrum image; Said spatial frequency spectrum image acquisition system comprises a ccd detector and a computing machine at least; Said Analysis and Identification software systems have functions such as image stores processor, graphical analysis comparison, database information management.In said light-source illuminating system and said spatial frequency spectrum generation system; Can shared lens or a lens combination or a camera lens that constitutes jointly by a plurality of lens; Realization is collimated into directional light with light source; And the reflected light of diamond cut surface different directions is focused on the receiving screen, form the spatial frequency spectrum image.
Between light-source illuminating system, spatial frequency spectrum generation system, spatial frequency spectrum image acquisition system, can adopt coaxial optical system design and two kinds of distribution forms of non-coaxial optical system design.The system and device exemplifying embodiment of introduction of the present invention comprises 2 kinds of coaxial optical system design apparatus organization plans and a kind of non-coaxial optical system design apparatus organization plan.The coaxial optical system design of introduction of the present invention has spatial frequency spectrum translation invariance and rotational invariance; Can obtain good diamond cut surface reflected light spatial frequency spectrum image; Distortion can not appear in the spatial frequency spectrum image, helps diamond identity characteristic fingerprint detection Analysis and Identification.Certain distortion can appear in the diamond cut surface reflected light spatial frequency spectrum image that non-coaxial or not exclusively coaxial design of Optical System obtains, and the high-frequency region distortion is bigger especially on the edge of, is unfavorable for diamond identity characteristic fingerprint detection Analysis and Identification.The method that the non-coaxial optical system design apparatus organization plan of introduction of the present invention adopts a kind of catoptron to increase field angle reduces the marginal distortion that this non-coaxial optical system causes; And, improve the accuracy of diamond identity characteristic fingerprint detection Analysis and Identification through the further influence of reduction marginal distortion of software correction.
Description of drawings
First kind of coaxial optical system apparatus structure implementation method synoptic diagram that Fig. 1 designs for the present invention
Second kind of coaxial optical system apparatus structure implementation method synoptic diagram that Fig. 2 designs for the present invention
A kind of non-coaxial optical system apparatus structure implementation method synoptic diagram that Fig. 3 designs for the present invention
Fig. 4 is the spatial frequency spectrum image example with the representative diamond identity characteristic of system and device acquisition of the present invention
Embodiment
Optical Fourier transformation diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method based on the present invention's proposition; Design construction of the present invention diamond identity characteristic fingerprint spatial frequency spectrum check and analysis identification systems devices, comprise four parts such as light-source illuminating system, spatial frequency spectrum generation system, spatial frequency spectrum image acquisition system, Analysis and Identification software systems.The invention provides three kinds of diamond identity characteristic fingerprint spatial frequency spectrum check and analysis identification systems apparatus structure embodiments, specific as follows:
Scheme one is a kind of coaxial diamond identity characteristic spatial frequency spectrum check and analysis identification systems apparatus structure of beam splitter beam split, and is as shown in Figure 1, and aperture 14 and receiving screen 17 all place the back focal plane of lens 12.Light source 13 (laser; LED, or other monochrome, accurate monochrome and multi-wavelength composite light source) light wave that sends is focused on the aperture 14 through condenser 15 becomes pointolite, and light transmission beam splitter 16 backs that pointolite sends are collimated into directional light by lens 12; Vertical diamond 11 table top normal incidences illumination; Assembled by lens 12 from the light beam that each cut surface of diamond reflects,, on receiving screen 17, form the spatial frequency spectrum image through beam splitter 16 reflections.Ccd detector 19 is carried out to picture through the graph of spatial frequency spectrum on 18 pairs of receiving screens 17 of an imaging len, and image is imported computing machine 10.Wherein, light-source illuminating system is made up of light source 13, condenser 15, aperture 14 and lens 12, realizes collimated illumination light path function; The spatial frequency spectrum generation system is made up of lens 12, beam splitter 16 and receiving screen 17, realizes the optical Fourier transformation function; Spatial frequency spectrum image acquisition system is made up of ccd detector 19 and imaging len 18, realizes CCD imaging digital image processing function; The Analysis and Identification software systems comprise computing machine 10 and are installed in the analytical applications software on the computing machine 10, realize functions such as the storage of diamond identity characteristic spatial frequency spectrum image, graphical analysis comparison, database information management, diamond identity characteristic Analysis and Identification.The advantage of this scheme is: the detection system light path is coaxial fully, and the diamond cut surface reflected light spatial frequency spectrum image that CCD collects can not produce distortion.Because there is certain reflection and transmission splitting ratio in beam splitter, so the spatial frequency spectrum picture signal on the receiving screen has institute and descends, and the present invention improves the spatial frequency spectrum picture signal on the receiving screen through the intensity of raising light source.
Scheme two is a kind of coaxial diamond identity characteristic spatial frequency spectrum check and analysis identification systems apparatus structure of reflective beam split, and is as shown in Figure 2, and aperture 26 and receiving screen 27 all place the back focal plane of lens 22.Light source 24 (laser; LED, or other monochrome, accurate monochrome and multi-wavelength composite light source) light wave that sends is focused on the aperture 26 through condenser 25 becomes pointolite, and the light that pointolite sends is collimated into directional light through catoptron 23 backs by lens 22; Vertical diamond 21 table top normal incidences illumination; Assembled by lens 22 from the light beam that each cut surface of diamond reflects, penetration mirror 23 forms graph of spatial frequency spectrum on receiving screen 27.Ccd detector 29 is carried out to picture through the graph of spatial frequency spectrum on 28 pairs of receiving screens 27 of an imaging len, and image is imported computing machine 20.Wherein, light-source illuminating system is made up of light source 24, condenser 25, aperture 26, catoptron 23 and lens 22, realizes collimated illumination light path function; The spatial frequency spectrum generation system is made up of lens 22 and receiving screen 27, realizes the optical Fourier transformation function; Spatial frequency spectrum image acquisition system is made up of ccd detector 29 and imaging len 28, realizes CCD imaging digital image processing function; The Analysis and Identification software systems comprise computing machine 20 and are installed in the analytical applications software on the computing machine 20, realize functions such as the storage of diamond identity characteristic spatial frequency spectrum image, graphical analysis comparison, database information management, diamond identity characteristic Analysis and Identification.The advantage of this scheme is: the detection system light path is coaxial fully; The diamond cut surface reflected light spatial frequency spectrum image that CCD collects can not produce distortion; The spatial frequency spectrum image directly is incident upon on the receiving screen 27 free of losses of spatial frequency spectrum picture signal intensity around catoptron 23.Because there is certain size in catoptron 23, zero level and rudimentary spatial frequency spectrum picture signal are blocked, and can't reach on the receiving screen 27, and the segment space spectrum information is lost.The present invention is through the optimization system structure, and the physical dimension of dwindling catoptron 23 as far as possible makes it only to block the catoptrical zero level spectrum signal of diamond cut surface, guarantees the accuracy that the check and analysis of diamond identity characteristic spatial frequency spectrum are identified.
Scheme three is a kind of non-coaxial diamond identity characteristic spatial frequency spectrum check and analysis identification systems apparatus structure, and is as shown in Figure 3, and aperture 34 and receiving screen 33 all place the back focal plane of lens 32.Light source 35 (laser; LED; Or other monochrome, accurate monochrome and multi-wavelength composite light source) light wave that sends filters through aperture 34 becomes pointolite, and the light that pointolite sends is collimated into directional light through lens 32, vertical diamond 31 table top normal incidences illumination; Assembled by lens 32 from the light beam that each cut surface of diamond reflects, be incident upon on the receiving screen 33 and form graph of spatial frequency spectrum.Ccd detector 38 is carried out to picture through the graph of spatial frequency spectrum on an imaging len 37 and 36 pairs of receiving screens 33 of catoptron, and image is imported computing machine 30.Wherein, light-source illuminating system is made up of light source 35, aperture 34 and lens 32, realizes collimated illumination light path function; The spatial frequency spectrum generation system is made up of lens 32 and receiving screen 33, realizes the optical Fourier transformation function; Spatial frequency spectrum image acquisition system is made up of ccd detector 38, imaging len 37 and catoptron 36, realizes CCD imaging digital image processing function; The Analysis and Identification software systems comprise computing machine 30 and are installed in the analytical applications software on the computing machine 30, realize functions such as the storage of diamond identity characteristic spatial frequency spectrum image, image distortion correction, graphical analysis comparison, database information management, diamond identity characteristic Analysis and Identification.The advantage of this scheme is: detection system does not have beam split and blocks, and the spatial frequency spectrum image directly is incident upon on the receiving screen, does not have the loss of signal intensity and frequency content.But owing to be a kind of non-axis light line structure, the diamond cut surface reflected light spatial frequency spectrum image that CCD collects can produce certain deformation or distortion, and especially the distortion of edge radio-frequency component is more obvious.The present invention adopts catoptron 36 to change and enlarge field angle; Can effectively reduce the distortion of edge radio-frequency component; Through software certain correction is carried out in the distortion of edge radio-frequency component simultaneously, guaranteed the accuracy that the check and analysis of diamond identity characteristic spatial frequency spectrum are identified.
In scheme one, scheme two and scheme three, lens and condenser can be a plano-convex lens or concave-convex lens or convex lens or aspheric mirror etc., also can be lens combination or the camera lenses by a plurality of lens combinations; Catoptron can be plane mirror or concave mirror; When light source go out light beam very little (＜=1mm) or during the equivalent point light source, like laser or optical fiber source, aperture, condenser etc. all can omit need not; Ccd detector also can be cmos detector or other array electrooptical devices; Condenser can also be a concave mirror; Beam splitter also can be spectroscope or prism or dichroic mirror etc.Catoptron 23 also can use a beam splitter (beam splitter 16 among similar Fig. 1) to substitute in the scheme two; Realize the illumination of beam splitter reflected light path; Beam splitter transmitted light path span spectral image; The beam splitter size is not limit, and can be that several millimeters (spatial frequency spectrum generates the light path part beam splitting) also can arrive hundreds of millimeter (spatial frequency spectrum generates the whole beam splitting of light path).
The spatial frequency spectrum image example of the representative diamond identity characteristic that system and device of the present invention obtains is as shown in Figure 4; Bright spot quantity equates with diamond cut surface quantity among the figure; The brightness position is corresponding one by one with the cut surface architectural feature, can be used as the finger print information of diamond identity characteristic.
The present invention can reach following performance index:
1, system's detection adaptation diamond equivalent diameter magnitude range is 0.1mm～50mm.
2, system's detection spatial frequency spectrum scope is 0～1MHz.
Claims (10)
1. diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device based on optical Fourier transformation; It is characterized in that: described a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method based on optical Fourier transformation adopts illumination path, optical Fourier transformation light path and the complete coaxial design of Optical System structure of CCD imaging optical path; Parallel beam normal incidence illumination diamond table; Through lens the reflected light of diamond cut surface is carried out optical Fourier transformation; Back focal plane at lens obtains the catoptrical spatial frequency spectrum of each cut surface of diamond; Collect the catoptrical spatial frequency spectrum image of diamond cut surface through a CCD imaging optical path then, the input computing machine carries out image storing tube reason, image recognition and diamond identity characteristic Analysis and Identification; Described system and device comprises four parts such as light-source illuminating system, spatial frequency spectrum generation system, spatial frequency spectrum image acquisition system, Analysis and Identification software systems; Light-source illuminating system, spatial frequency spectrum generation system, spatial frequency spectrum image acquisition system are coaxial on light channel structure in the described system and device.
2. a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device based on optical Fourier transformation as claimed in claim 1, it is characterized in that: said light-source illuminating system includes a light source and at least makes said light source become the lens of directional light.
3. a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device as claimed in claim 1 based on optical Fourier transformation; It is characterized in that: said spatial frequency spectrum generation system comprises lens or the lens combination and the receiving screen that are constituted jointly by a plurality of lens at least; Receiving screen is positioned on the back focal plane of lens or lens combination; The reflected light of diamond cut surface is focused on the receiving screen through lens or lens combination, forms graph of spatial frequency spectrum.
4. a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device based on optical Fourier transformation as claimed in claim 1, it is characterized in that: said spatial frequency spectrum image acquisition system comprises a ccd detector or cmos detector, an imaging len or camera lens at least.
5. a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device as claimed in claim 1 based on optical Fourier transformation; It is characterized in that: said Analysis and Identification software systems comprise a computing machine and analytical applications software, realize functions such as image stores processor, graphical analysis comparison, database information management, diamond identity characteristic Analysis and Identification.
6. like claim 1; The described a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device of claim 2 and claim 3 based on optical Fourier transformation; It is characterized in that: in said light-source illuminating system and said spatial frequency spectrum generation system; Can shared lens or a lens combination or a camera lens that constitutes jointly by a plurality of lens; Realization is collimated into directional light with light source, and the reflected light of diamond cut surface different directions is focused on the receiving screen, forms the spatial frequency spectrum image.
7. like claim 1 and the described a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device of claim 2 based on optical Fourier transformation; It is characterized in that: in said light-source illuminating system; Can adopt concave mirror or lens light gathering on an aperture; Obtain the equivalent point light source, improve the collimate in parallel characteristic of diamond illuminating bundle.
8. diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device based on optical Fourier transformation; It is characterized in that: described a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method based on optical Fourier transformation adopts illumination path, Fourier transform light path and the incomplete coaxial design of Optical System structure of CCD imaging optical path; Parallel beam normal incidence illumination diamond table; Through lens the reflected light of diamond cut surface is carried out optical Fourier transformation; Back focal plane at lens obtains the catoptrical spatial frequency spectrum of each cut surface of diamond; Collect the catoptrical spatial frequency spectrum image of diamond cut surface through an out-of-alignment CCD imaging optical path then, the input computing machine carries out image stores processor, image distortion correction, image recognition and diamond identity characteristic Analysis and Identification.
9. a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device as claimed in claim 8 based on optical Fourier transformation; It is characterized in that: described system and device comprises four parts such as light-source illuminating system, spatial frequency spectrum generation system, spatial frequency spectrum image acquisition system, Analysis and Identification software systems, and space spectral image acquisition system is an out-of-alignment with light-source illuminating system and spatial frequency spectrum generation system on light channel structure in described system and device.
10. like claim 8 and the described a kind of diamond identity characteristic fingerprint spatial frequency spectrum Analysis and Identification method and system device of claim 9 based on optical Fourier transformation; It is characterized in that: described spatial frequency spectrum image acquisition system changes the field angle that enlarges the IMAQ imaging optical path through a catoptron; Reduce the distortion of edge radio-frequency component, improve the accuracy that the spectrum analysis of diamond identity characteristic is identified.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107238409A (en) * | 2017-05-05 | 2017-10-10 | 刘厚祥 | A kind of method and its identifying system for being used to recognize jewel identity |
| CN107727657A (en) * | 2017-10-20 | 2018-02-23 | 中国地质大学（武汉） | A kind of diamond identity authentication instrument |
| CN109099867A (en) * | 2018-06-26 | 2018-12-28 | 无锡新吉凯氏测量技术有限公司 | A kind of jewel certification and identifying system and method based on geometric shape information |
| CN110081976A (en) * | 2019-05-21 | 2019-08-02 | 中国科学院光电研究院 | A kind of big visual field grating prism spectrum imaging system |
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| US5828405A (en) * | 1995-11-09 | 1998-10-27 | Omphalos Recovery Systems Inc. | Gemstone registration system |
| CN101663575A (en) * | 2007-08-31 | 2010-03-03 | 佳能株式会社 | Imaging method and apparatus using terahertz radiation |
| CN101718589A (en) * | 2009-11-14 | 2010-06-02 | 张青川 | Optical readout method for infrared thermal imagery imager |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5828405A (en) * | 1995-11-09 | 1998-10-27 | Omphalos Recovery Systems Inc. | Gemstone registration system |
| CN101663575A (en) * | 2007-08-31 | 2010-03-03 | 佳能株式会社 | Imaging method and apparatus using terahertz radiation |
| CN101718589A (en) * | 2009-11-14 | 2010-06-02 | 张青川 | Optical readout method for infrared thermal imagery imager |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238409A (en) * | 2017-05-05 | 2017-10-10 | 刘厚祥 | A kind of method and its identifying system for being used to recognize jewel identity |
| WO2018201580A1 (en) * | 2017-05-05 | 2018-11-08 | 刘厚祥 | Method for recognizing identity of gemstone, and recognition system thereof |
| CN107238409B (en) * | 2017-05-05 | 2020-02-04 | 刘厚祥 | Method for identifying gem identity and identification system thereof |
| CN107727657A (en) * | 2017-10-20 | 2018-02-23 | 中国地质大学（武汉） | A kind of diamond identity authentication instrument |
| CN107727657B (en) * | 2017-10-20 | 2021-07-13 | 中国地质大学（武汉） | Diamond identity authentication instrument |
| CN109099867A (en) * | 2018-06-26 | 2018-12-28 | 无锡新吉凯氏测量技术有限公司 | A kind of jewel certification and identifying system and method based on geometric shape information |
| CN110081976A (en) * | 2019-05-21 | 2019-08-02 | 中国科学院光电研究院 | A kind of big visual field grating prism spectrum imaging system |
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Application publication date: 20120314 |