CN106248057B - The recognition methods and identification device that a kind of pair of Iaserdetectaphone positions - Google Patents
The recognition methods and identification device that a kind of pair of Iaserdetectaphone positions Download PDFInfo
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- CN106248057B CN106248057B CN201610819870.0A CN201610819870A CN106248057B CN 106248057 B CN106248057 B CN 106248057B CN 201610819870 A CN201610819870 A CN 201610819870A CN 106248057 B CN106248057 B CN 106248057B
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- iaserdetectaphone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
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Abstract
The present invention discloses the recognition methods of a kind of pair of Iaserdetectaphone positioning and identification device, the recognition methods include：Iaserdetectaphone to be positioned emits laser to glass, and the laser forms scattering light and transmitted light by the glass；The transmitted light in the gaze detection region among the AOTF device and glass is received by acousto-optic tunable light spectrum image-forming AOTF device, obtains scattering light spot image；The orientation of the Iaserdetectaphone to be positioned is determined according to the scattering light spot image.The present invention carries out continuous narrow-band spectrum filtering near infrared band using AOTF technology to the recognition methods that Iaserdetectaphone positions, by carrying out light spectrum image-forming to window-glass, and the characteristics of image of the back scattering hot spot in conjunction with glass, the orientation that the Iaserdetectaphone to be positioned is determined by control device, improves the accuracy of identification.
Description
Technical field
The present invention relates to positioning tracking technology field, recognition methods more particularly to a kind of pair of Iaserdetectaphone positioning and
Identification device.
Background technique
Laser eavesdropping refer to by laser technology detect people from distant place talk content, this eavesdropping mode operating distance compared with
Far, it and is not readily susceptible to interfere, a most important feature is not need to install any equipment around eavesdropping target.
With getting worse for laser eavesdropping behavior, various business, S&T globalisation are more and more easy to be leaked, so that
Study of Laser eavesdropping warning technology is very important problem, and there has been no accuse than more complete, system laser eavesdropping at present
The analysis method of alert system.
However for current Laser Warning Technologies, eavesdrops laser beam and be radiated at crown glass, tempered glass, sapphire blue glass
When on any one glass material such as glass, all it can make light beam that Rayleigh scattering phenomenon occur on glass, to can not track
To the azimuth information of eavesdropping laser.Secondly, the laser band that Laser Eavesdropping uses is infrared band, human eye and
General camera can not direct detection to scattering hot spot, and then bring extreme difficulties to anti-eavesdropping early warning.Further, since existing
The guiding light beam that scatter sounding formula laser engineered net shaping is issued primarily directed to the laser guided weapon on battlefield surroundings, and laser
Eavesdropping generallys use solid state laser, and the two light beam is in optical maser wavelength, backscatter mode, irradiation spot diameter, irradiation mode
Etc. all there is very big differences, therefore, scatter sounding formula laser warning Position Research method cannot directly apply to laser
Eavesdropping field need to re-start the research of system structure design and orientation inversion method.
Summary of the invention
The object of the present invention is to provide the recognition methods of a kind of pair of Iaserdetectaphone positioning, it can accurately determine and to be positioned swash
The orientation of light tapping device.
To achieve the above object, the present invention provides following schemes：
The recognition methods of a kind of pair of Iaserdetectaphone positioning, which is characterized in that the recognition methods includes：
Iaserdetectaphone to be positioned emits laser to glass, and the laser is by glass formation scattering light and thoroughly
Penetrate light；
The gaze detection area among the AOTF device and glass is received by acousto-optic tunable light spectrum image-forming AOTF device
Transmitted light in domain obtains scattering light spot image；
The orientation of the Iaserdetectaphone to be positioned is determined according to the scattering light spot image.
Optionally, the method in the orientation of the determination Iaserdetectaphone to be positioned includes：
Binaryzation pretreatment is carried out to the scattering light spot image, obtains pretreatment image；
Edge detection is carried out to the pretreatment image, obtains the corresponding binary image of gray approximation；
Extract the profile of object in the binary image；
Ellipse fitting is carried out to the profile, obtains elliptic parameter；
The mathematical model between Iaserdetectaphone and glass is constructed according to the elliptic parameter, with the laser that determination is to be positioned
The orientation of tapping device.
Optionally, the elliptic parameter includes oval tilt angle, transverse, short axle and center point coordinate.
Optionally, the orientation of the Iaserdetectaphone to be positioned includes the azimuth of Iaserdetectaphone to be positioned and bows
The elevation angle.
The specific embodiment provided according to the present invention, the invention discloses following technical effects：
The present invention carries out continuous narrowband near infrared band using AOTF technology to the recognition methods that Iaserdetectaphone positions
Spectral filtering by carrying out light spectrum image-forming to window-glass, and combines the characteristics of image of the back scattering hot spot of glass, passes through
Control device determines the orientation of the Iaserdetectaphone to be positioned, improves the accuracy of identification.
The object of the present invention is to provide the identification device of a kind of pair of Iaserdetectaphone positioning, it can accurately determine and to be positioned swash
The orientation of light tapping device.
To achieve the above object, the present invention provides following schemes：
The identification device of a kind of pair of Iaserdetectaphone positioning, the identification device include：
Glass, the glass make the transmitting laser be divided into scattering after the transmitting laser irradiation by Iaserdetectaphone
Light and transmitted light；
AOTF device, the AOTF device corresponds to the glass setting, and gaze detection area is formed between the glass
Domain, the AOTF device are used to obtain the transmitted light in the gaze detection region after scattering, form scattering light spot image；
Control device is connect with the AOTF device, for determining the laser eavesdropping according to the scattering light spot image
The position of device.
Optionally, the control device includes：
Pretreatment unit obtains pretreatment image for carrying out binaryzation pretreatment to the scattering light spot image；
Edge detection unit obtains gray approximation corresponding two for carrying out edge detection to the pretreatment image
Value image；
Extraction unit, for extracting the profile of object in the binary image；
Fitting unit obtains elliptic parameter for carrying out ellipse fitting to the profile；
Modeling unit, for constructing the mathematical model between Iaserdetectaphone and glass according to the elliptic parameter, with true
The orientation of fixed Iaserdetectaphone to be positioned.
Optionally, the elliptic parameter includes oval tilt angle, transverse, short axle and center point coordinate.
Optionally, the orientation of the Iaserdetectaphone to be positioned includes the azimuth of Iaserdetectaphone to be positioned and bows
The elevation angle.
Compared with the existing technology, the present invention positions the identification device that Iaserdetectaphone positions with above-mentioned to Iaserdetectaphone
Recognition methods effective effect it is identical, details are not described herein.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart of recognition methods of the present invention to Iaserdetectaphone positioning；
Fig. 2 is the schematic diagram calculation one of the inclined ellipse of recognition methods of the present invention to Iaserdetectaphone positioning；
Fig. 3 is the schematic diagram calculation two of the inclined ellipse of recognition methods of the present invention to Iaserdetectaphone positioning；
Fig. 4 is the location information figure of Iaserdetectaphone to be positioned；
Fig. 5 is the pitch angle figure of Iaserdetectaphone to be positioned；
Fig. 6 is modular structure schematic diagram of the present invention to the identification device of Iaserdetectaphone positioning；
Fig. 7 is working principle diagram of the present invention to the identification device of Iaserdetectaphone positioning.
Symbol description：
1 glass 2 of Iaserdetectaphone
3 control device 4 of AOTF device
41 edge detection unit 42 of pretreatment unit
43 fitting unit 44 of extraction unit
Modeling unit 44 scatters light 5
6 gaze detection region 7 of transmitted light.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of pair of Iaserdetectaphone positioning recognition methods, by acousto-optic tunable spectrum at
Picture (Acousto-Optic Turnable Filter, AOTF) device can arbitrarily select the spectrum of system, and selection has target
The spectral wavelength of characteristic different-waveband, so as to form different images of the same target under different spectral wavelengths.It utilizes
AOTF technology carries out continuous narrow-band spectrum filtering near infrared band, by carrying out light spectrum image-forming to window-glass, and combines
The characteristics of image of the back scattering hot spot of glass is determined the orientation of the Iaserdetectaphone to be positioned by control device, mentioned
The accuracy of height identification.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1, the recognition methods that the present invention positions Iaserdetectaphone includes：
Step 100：Iaserdetectaphone to be positioned to glass emit laser, and the laser formed by the glass it is scattered
Penetrate light and transmitted light.
Step 200：It is received by acousto-optic tunable light spectrum image-forming AOTF device solidifying among the AOTF device and glass
Depending on the transmitted light in detection zone, scattering light spot image is obtained.
Step 300：The orientation of the Iaserdetectaphone to be positioned is determined according to the scattering light spot image.
Wherein, in step 200, by repeatedly adjusting detection angle or position, same glass is irradiated, thus
Obtain corresponding scattering hot spot.
In step 300, the method in the orientation of the determination Iaserdetectaphone to be positioned includes：
Step 310：Binaryzation pretreatment is carried out to the scattering light spot image, obtains pretreatment image.
Step 320：Edge detection is carried out to the pretreatment image, obtains the corresponding binary image of gray approximation.
In the present embodiment, edge detection is done using Sobel Operator Method.
Step 330：Extract the profile of object in the binary image.Generally two are obtained using bwboundaries function
Corresponding profile in value image.
Step 340：Ellipse fitting is carried out to the profile, obtains elliptic parameter.
Wherein, resulting profile carries out ellipse fitting using least square method.The elliptic parameter includes oval inclination angle
Degree, transverse, short axle and center point coordinate.
Step 350：The mathematical model between Iaserdetectaphone and glass is constructed according to the elliptic parameter, it is undetermined with determination
The orientation of the Iaserdetectaphone of position.
The method for carrying out ellipse fitting to the profile specifically includes：
(1) coefficient of inclined ellipse is calculated
If inclined ellipse equation is ax2+bxy+cy2+ dx+ey-1=0 is asked using least square methodMinimum value, be expressed as so both sides derivation obtains matrix：
If enabling Xi=(xi 2,xiyi,yi 2,xi,yi), above-mentioned matrix can be write as
(2) relationship of standard ellipse and inclined ellipse is calculated
Since there is certain relationships on coordinate for inclined ellipse and standard ellipse, marked so being calculated using inclined ellipse
Quasi- oval, there are two kinds of situations, as follows respectively：
In the case of the first, if (x, y) is some coordinates in standard ellipse, (x ', y ') is some coordinates on inclined ellipse,
Two coordinate relationships are then obtained by (a) in Fig. 2 and (b)：
X '=rcos (α-θ)=r cos θ cos α+r sin θ sin α=x cos α+y sin α；
Y '=rsin (α-θ)=r cos θ sin α-r sin θ cos α=x sin α-y cos α；
Wherein, r indicates that (x, y) or (x ', y ') arrives the distance of origin, and θ indicates that (x, y) puts the straight line and x-axis for arriving origin
Angle, α indicate angle of (x ', the y ') point to the straight line of origin and (x, y) point to the straight line of origin.
Under second situation, if (x, y) is some coordinates in standard ellipse, (x ', y ') is some coordinates on inclined ellipse,
Two coordinate relationships are then obtained by (a) in Fig. 3 and (b)：
X '=rcos (α+θ)=r cos θ cos α-r sin θ sin α=x cos α-y sin α
Y '=rsin (α+θ)=r cos θ sin α+r sin θ cos α=x sin α+y cos α
(3) coefficient of standard ellipse is calculated
The coefficient of standard ellipse is calculated separately using the relationship of inclination and standard ellipse in step (2).If inclined ellipse side
Formula is ax '2+bx′y′+cy′2+ dx '+ey ' -1=0, standard ellipse equation are a ' x2+c′y2+ d ' x+e ' y-1=0.
In the case of the first, x '=x cos α+y sin α, y '=x sin α-y cos α is substituted into inclined ellipse equation,
I.e.
It can obtain：A '=a cos2α+b cosαsinα+c sin2α, c '=a sin2α-b cosαsinα+c cos2α,
D '=d cos α+esin α, e '=d sin α-ecos α.
Because it is zero, 2a cos α sin α-bsin that standard ellipse, which intersects term coefficient,2α+bcos2α -2csin α cos α=
0, then the rotation angle from inclined ellipse to standard ellipse
Under second situation, x '=x cos α-y sin α, y '=x sin α+y cos α is substituted into inclined ellipse equation,
I.e.
It can obtain：A '=a cos2α+b cosαsinα+c sin2α, c '=a sin2α-b cosαsinα+c cos2α,
D '=d cos α+e sin α, e '=e cos α-d sin α.
Because it is zero that standard ellipse, which intersects term coefficient, -2a cos α sin α-b sin2α+b cos2α+2c sinαcos
α=0, then the rotation angle from inclined ellipse to standard ellipse be
(4) standard ellipse centre coordinate and major and minor axis are calculated
Being marked with quasi- elliptical center point is (x0,y0), when main shaft is parallel to x-axis, oval long and short axis is m respectively, the maximum in n
Value and minimum value, standard ellipse equation are expressed asBy two kinds of expression formulas of standard ellipse：The centre coordinate for obtaining standard ellipse is
Major and minor axis is respectivelyIn maximum value and minimum value.
(5) center point coordinate of inclined ellipse is calculated
If the center point coordinate of inclined ellipse is (x '0,y′0), the centre coordinate of standard ellipse is (x0,y0), utilize step
(2) relationship between the two in, is divided into following two situation：
In the case of the first, will, x '=x cos α+y sin α y '=x sin α-y cos α substitutes into inclined ellipse equation,
The centre coordinate for obtaining inclined ellipse is (x0cosα+y0sinα,x0sinα-y0cosα)。
Under second situation, x '=x cos α-y sin α, y '=x sin α+y cos α is substituted into inclined ellipse equation,
The centre coordinate for obtaining inclined ellipse is (x0cosα-y0sinα,x0sinα+y0cosα)。
In step 350, the orientation of the Iaserdetectaphone to be positioned includes the orientation of Iaserdetectaphone to be positioned
Angle and pitch angle.In combination with Fig. 4, laser beam shown in the part (a) is pitching in the projection of the face XOZ and the angle of Z axis in Fig. 4
AngleIt is azimuthal angle beta that laser beam shown in part, which projects in the face XOY with the angle of X-axis, in (b) in Fig. 4, and wherein the face XOY is
Glass surface, OL are that laser beam projects in the face XOY, and bowing for Iaserdetectaphone to be positioned is determined according to transverse and short axle
The elevation angleThe azimuthal angle beta of Iaserdetectaphone to be positioned is determined according to oval tilt angle.
Wherein, the mathematical model between Iaserdetectaphone and glass is constructed according to the elliptic parameter, it is to be positioned with determination
The specific method in orientation of Iaserdetectaphone include：
It initially sets up in mathematical model such as Fig. 5 between Iaserdetectaphone and glass shown in (a), wherein with O1Centered on
Ellipse is fitted ellipse, i.e. Iaserdetectaphone is radiated at the image on glass, crosses O2The plane x of point2o2y2It hangs down with beam center line
Direct join meets at O3Point, then x2O2y2Hot spot is circular light spot, O on beam cross section3' it is the beam cross section center of circle eavesdropping laser and issuing
O3Projection on glass surface utilizes tetrahedron O in Fig. 4 shown in (b)1O2O3O3The different triangle sets of ' building are at different
Mathematical relationship.
The part (a) in Fig. 5, point O1In coordinate system x1y1z1In coordinate be (0,0,0), point O2In coordinate system x2y2z2In
Coordinate be (A, 0,0), point O3In coordinate system x2y2z2In coordinate be (B, 0,0), set up an office O3' in coordinate system x1y1z1In seat
It is designated as (x1,y1, 0), wherein A is that the hot spot on glass fits elliptical major semiaxis, and B is that the hot spot on glass fits ellipse
Semi-minor axis.
In △ O1O2O3Middle satisfactionSo
In △ O3’O3O1Middle satisfaction(o3o'3)2=A2-B2-(x1 2+y1 2)；
It obtains
In △ O3’X1O2Middle satisfaction (o2o'3)2=(A-x1)2+y1 2, (o3o'3)2=B2-(A-x1)2-y1 2；
Because of A2-B2-(x1 2+y1 2)=B2-(A-x1)2-y1 2, so
BecauseSo
With O3The area of a circle for the center of circle is s1=π B2, with O1Centered on ellipse area be s2=π AB, therefore two
Face angle
And becauseSo y1=0.
In conclusion point O3' in coordinate system x1y1z1In coordinate beObtain beam cross section center of circle O3
Projection O3' in O1O2Line on, to obtain the pitch angle of IaserdetectaphoneFor
For determining that the azimuthal angle beta of Iaserdetectaphone is the rotation angle of inclined ellipse during ellipse fittingOrWherein, a is inclined ellipse equation x2Coefficient, b be inclined ellipse side
The coefficient of formula cross term xy, c are inclined ellipse equation y2Coefficient.
In addition, the present invention also provides the identification devices of a kind of pair of Iaserdetectaphone positioning.As shown in Figure 6 and Figure 7, of the invention
Identification device to Iaserdetectaphone positioning includes glass 2, AOTF device 3 and control device.
Wherein, the glass 2 is divided into the transmitting laser scattered after the transmitting laser irradiation by Iaserdetectaphone 1
Penetrate light 5 and transmitted light 6；The corresponding glass 2 of the AOTF device 3 is arranged, and gaze detection area is formed between the glass 2
Domain 7, the AOTF device 3 obtain the transmitted light 6 in the gaze detection region 7 after scattering, form scattering light spot image；
The control device 4 is connect with the AOTF device 3, and the position of the Iaserdetectaphone is determined according to the scattering light spot image
It sets.In the present embodiment, the glass 2 is K9 glass, and the laser that the Iaserdetectaphone 1 issues is the close red of wavelength 671nm
Outer laser.
Wherein, the control device 4 includes pretreatment unit 41, edge detection unit 42, extraction unit 43, fitting unit
44 and modeling unit 45.Wherein, the pretreatment unit 41 is used to carry out binaryzation pretreatment to the scattering light spot image, obtains
To pretreatment image；The edge detection unit 42 is used to carry out edge detection to the pretreatment image, obtains gray scale approximation
It is worth corresponding binary image；The extraction unit 43 is used to extract the profile of object in the binary image；The fitting
Unit 44 is used to carry out ellipse fitting to the profile, obtains elliptic parameter；The modeling unit 45 is used for according to the ellipse
Parameter constructs the mathematical model between Iaserdetectaphone and glass, with the orientation of determination Iaserdetectaphone to be positioned.
The elliptic parameter includes oval tilt angle, transverse, short axle and center point coordinate.Described to be positioned swashs
The orientation of light tapping device includes azimuth and the pitch angle of Iaserdetectaphone to be positioned.It is determined according to oval tilt angle undetermined
The azimuth of the Iaserdetectaphone of position, the pitch angle of Iaserdetectaphone to be positioned is determined according to transverse and short axle.
Compared with the existing technology, the present invention positions the identification device that Iaserdetectaphone positions with above-mentioned to Iaserdetectaphone
Recognition methods effective effect it is identical, details are not described herein.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (7)
1. the recognition methods of a kind of pair of Iaserdetectaphone positioning, which is characterized in that the recognition methods includes：
Iaserdetectaphone to be positioned emits laser to glass, and the laser forms scattering light and transmission by the glass
Light；
It is received in the gaze detection region among the AOTF device and glass by acousto-optic tunable light spectrum image-forming AOTF device
Transmitted light, obtain scattering light spot image；
The orientation of the Iaserdetectaphone to be positioned is determined according to the scattering light spot image；
The method in the orientation of the determination Iaserdetectaphone to be positioned includes：
Binaryzation pretreatment is carried out to the scattering light spot image, obtains pretreatment image；
Edge detection is carried out to the pretreatment image, obtains the corresponding binary image of gray approximation；
Extract the profile of object in the binary image；
Ellipse fitting is carried out to the profile, obtains elliptic parameter；
The mathematical model between Iaserdetectaphone and glass is constructed according to the elliptic parameter, with the laser eavesdropping that determination is to be positioned
The orientation of device.
2. the recognition methods according to claim 1 to Iaserdetectaphone positioning, which is characterized in that the elliptic parameter packet
Include oval tilt angle, transverse, short axle and center point coordinate.
3. the recognition methods according to claim 1 to Iaserdetectaphone positioning, which is characterized in that described to be positioned swashs
The orientation of light tapping device includes azimuth and the pitch angle of Iaserdetectaphone to be positioned.
4. the identification device of a kind of pair of Iaserdetectaphone positioning, which is characterized in that the identification device includes：
Glass, the glass after the transmitting laser irradiation by Iaserdetectaphone, make the transmitting laser be divided into scattering light and
Transmitted light；
AOTF device, the AOTF device corresponds to the glass setting, and gaze detection region, institute are formed between the glass
AOTF device is stated for obtaining the transmitted light in the gaze detection region after scattering, forms scattering light spot image；
Control device is connect with the AOTF device, for determining the Iaserdetectaphone according to the scattering light spot image
Position.
5. the identification device according to claim 4 to Iaserdetectaphone positioning, which is characterized in that the control device packet
It includes：
Pretreatment unit obtains pretreatment image for carrying out binaryzation pretreatment to the scattering light spot image；
Edge detection unit obtains the corresponding binaryzation of gray approximation for carrying out edge detection to the pretreatment image
Image；
Extraction unit, for extracting the profile of object in the binary image；
Fitting unit obtains elliptic parameter for carrying out ellipse fitting to the profile；
Modeling unit, for constructing the mathematical model between Iaserdetectaphone and glass according to the elliptic parameter, with determine to
The orientation of the Iaserdetectaphone of positioning.
6. the identification device according to claim 5 to Iaserdetectaphone positioning, which is characterized in that the elliptic parameter packet
Include oval tilt angle, transverse, short axle and center point coordinate.
7. the identification device according to claim 5 to Iaserdetectaphone positioning, which is characterized in that described to be positioned swashs
The orientation of light tapping device includes azimuth and the pitch angle of Iaserdetectaphone to be positioned.
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| CN111208576A (en) * | 2020-01-08 | 2020-05-29 | 苏州华云视创智能科技有限公司 | Anti-laser interception system |
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| EP1225714A2 (en) * | 2001-01-19 | 2002-07-24 | Nippon Telegraph and Telephone Corporation | Scrambled optical communication method and system |
| CN101344376A (en) * | 2008-08-28 | 2009-01-14 | 上海交通大学 | Measuring method for spacing circle geometric parameter based on monocular vision technology |
| CN101620676A (en) * | 2009-07-02 | 2010-01-06 | 浙江省电力公司 | Fast image recognition method of insulator contour |
| KR20110138511A (en) * | 2010-06-21 | 2011-12-28 | 제영호 | Eliminating system for harmful organisms |
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2016
- 2016-09-13 CN CN201610819870.0A patent/CN106248057B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1225714A2 (en) * | 2001-01-19 | 2002-07-24 | Nippon Telegraph and Telephone Corporation | Scrambled optical communication method and system |
| CN101344376A (en) * | 2008-08-28 | 2009-01-14 | 上海交通大学 | Measuring method for spacing circle geometric parameter based on monocular vision technology |
| CN101620676A (en) * | 2009-07-02 | 2010-01-06 | 浙江省电力公司 | Fast image recognition method of insulator contour |
| KR20110138511A (en) * | 2010-06-21 | 2011-12-28 | 제영호 | Eliminating system for harmful organisms |
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