CN101196986A - Three-dimensional palm print identity identifier and its identification method - Google Patents
Three-dimensional palm print identity identifier and its identification method Download PDFInfo
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- CN101196986A CN101196986A CNA2007101449130A CN200710144913A CN101196986A CN 101196986 A CN101196986 A CN 101196986A CN A2007101449130 A CNA2007101449130 A CN A2007101449130A CN 200710144913 A CN200710144913 A CN 200710144913A CN 101196986 A CN101196986 A CN 101196986A
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Abstract
The present invention provides a three-dimensional palmprint identity authentication instrument and an authentication method thereof. The present invention projects phase shifting structured light onto a palm through a projector in shared time, and a video camera collects a plurality of palm images with structured light according to the same time interval and sends the images into a microcomputer. According the information in the images, the microcomputer works out the depth information of a relative reference plane of each sampling point to form point cloud data. A three-dimensional point cloud can form a spatial structure of the palm to perform identity authentication. When no structured light is projected, the video camera acquires the gray image information of the palm, which can be applied to the prior two-dimensional palmprint identity authentication and the three-dimensional palmprint positioning. The present invention can be used for the acquisition of three-dimensional palmprint point cloud data and two-dimensional palmprint images. Therefore, with the support of software, three-dimensional palmprint identity authentication, two-dimensional palmprint identity authentication and the fusion of the two can be realized, which improves the accuracy of identity authentication.
Description
(1) technical field
The present invention relates to authentication technique, be specifically related to a kind of identity authentication technique and equipment based on human body biological characteristics.
(2) background technology
Traditional Palm Print Recognition System has a box, and there is light-emitting component the inside, and palm is placed on the platform that locating device is arranged on the box, utilizes video camera to clap the image information of getting palm and carries out the identity discriminating.This mode is subjected to the brightness of light in the box and the influence of contrast easily, and scribbling vestige etc. and can produce error to matching result on the palm.As if various traditional image process method are applied in the palmmprint identification at present, have obtained reasonable result, but two-dimentional Palm Print Recognition System has run into bottleneck, correct recognition rata improves limited.
(3) summary of the invention
The object of the present invention is to provide a kind of space structure information that can obtain palm, its quantity of information is compared with two dimensional image, and is abundant more and true, thereby can improve the three-dimensional palm print identity identifier and the discrimination method thereof of the accuracy of identification.
The technical solution adopted for the present invention to solve the technical problems is:
The product structure of identifier of the present invention is: it comprises cabinet, projector, video camera and control microcomputer, cabinet is provided with palm rest area, palm rest area is provided with the light hole and the fixing palm locating device of palm, projector and video camera are arranged in the cabinet and are connected transformer, the plane that the vertical palm of video camera is placed also connects the control microcomputer, projector and video camera center column are 30-45 degree angle and intersect at the palm rest area central area, and projector connects the control microcomputer by the VGA interface.
Product of the present invention also has some technical characterictics like this:
1, it also comprises the display that is arranged on the cabinet outside, and display connects the control microcomputer;
2, also be provided with shadow shield on the described cabinet, the parallel palm rest area setting of shadow shield;
3, described palm locating device comprises left hand palm fixed leg, right hand palm fixed leg and the middle palm fixed leg that is arranged on palm rest area, and middle palm fixed leg is arranged between left hand palm fixed leg and the right hand palm fixed leg; Preferably)
4, described projector and video camera center column be 30 the degree angles intersect at the palm rest area central area;
5, described projector is the LED projector of small size.
Discrimination method of the present invention is: at first carry out system initialization, projector is connected on the control microcomputer by the VGA interface, program timesharing on the control microcomputer changes screen content, screen content carries out phase-shift coding, thereby produce the structured light of encoding, the phase-shift structure light palm in one's hands that projector's timesharing ground projection was encoded, video camera is gathered the palm image that has structured light by the same time interval and is delivered in the control microcomputer, the control microcomputer obtains having behind the multiple image of structured light and to obtain each sampled point of palm image according to the information in the image is the depth information on relative reference plane with respect to the distance of reference planes, form the cloud data of the three-dimensional palm of point sampling, control the space structure that utilizes three-dimensional point cloud formation palm that Microcomputer Calculation goes out each sampled point of palm at last.
Discrimination method of the present invention also has some technical characterictics like this:
1, the production process of described phase-shift structure light is: generate some width of cloth coded images by computing machine, comprising sinusoidal phase shift figure and black and white strip figure, the image that generates projects tested palm surface by projector, object is carried out space encoding, and the coded system of projector is for adopting the sinusoidal gray scale image coding of timesharing.
2, described each sampled point is the depth information of trying to achieve the relative reference plane of each point by the relation between the respective pixel with respect to the method that obtains of the distance of reference planes, camera acquisition has the reference planes image and testee surface image of structured light to several after, go parcel to resolve, thereby obtain the phase differential on reference planes and testee surface.According to the triangle proportionate relationship,, calculate the relative height of reference planes and testee by phase differential.
3, described in system initialisation phase, reference planes are determined in the operation that need calibrate, and making it highly is 0.
After the control microcomputer obtains to have the palmprint image sequence of structured light among the present invention, calculate the palm height on relative reference plane and the three dimensional point cloud that obtains everywhere.Cloud data contains the abundant spatial information of palm, can be used for identity to differentiate.When projector's projective structure light time not, video camera obtains the gray level image of palm, and this image can be used for traditional two-dimentional identification, can also be used to the location of three-dimensional data etc.So the algorithm of two-dimentional palm print identity identification is suitable equally in instrument of the present invention, further be that two-dimentional palmmprint identification result, three-dimensional palm print identification result can be realized on same equipment, so can realize merging, improve final identification result.
Characteristics of the present invention have:
1, the people has on the estrade of a light hole in the middle of hand is lain in, and by stationary installation location palm, to avoid big translation or rotation, video camera obtains the palm print image information of palm, the structured light palm in one's hands that the timesharing ground projection of system controlled by computer projector changes, video camera obtains the palmprint image that has structured light at the same time, by the palmprint image of several band structure light, Microcomputer Calculation goes out the three-dimensional palm print cloud data, is used for identification;
2, projector is connected on the microcomputer by the VGA interface, and the program timesharing on the microcomputer changes screen content, and screen content carries out phase-shift coding, projects palm thereby produce the structured light of encoding.For the use of other functions of microcomputer, can use the split screen technology, a screen content is used to output to display, and the content of another screen outputs to projector;
3, in identification and when registration,, palm lies on the estrade that has locating device, and locating device is placed the hand standard of trying one's best;
4, the plane of the vertical palm placement of video camera, the angled palm central area that intersects at of projector and video camera center column;
5, video camera is connected on the microcomputer, and when the projector project content changed, video camera correspondingly obtained image, will obtain like this have structured light palmprint image several, rather than 1 width of cloth of traditional palmprint image;
6, by calibration, determine reference planes, making it highly is 0, and the position of these reference planes is near the palm of estrade;
7, after microcomputer obtains having the multiple image of structured light, can calculate the distance of sampled point, thereby obtain the cloud data of the three-dimensional palm of point sampling with respect to reference planes;
8, at projector's projective structure light in the process of palm, hand need keep static and can not move;
9, instrument of the present invention not in the projective structure light, can obtain the two-dimensional image information of palm in projector, and image can be used for traditional two-dimentional palmmprint identification, can be used for three-dimensional, the fusion of two dimension and the location of three-dimensional palm print data again.
The invention has the beneficial effects as follows that with respect to traditional Palm Print Recognition System that video camera obtains single image of passing through, this method can be obtained the depth information of palm each point.By processing to depth information, can obtain the space structure of palm, these quantity of information will produce useful help to living things feature recognition, and the conventional two-dimensional palm-print identifying arithmetic also can move under system simultaneously, is convenient to the fusion of three-dimensional, two dimension.The palmmprint data generate way, and the inventive method can access on the palm each point with respect to the depth information of reference planes, thereby obtain the three-dimensional structure of palm.
(4) description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of palm locating device;
Fig. 3 is the system handles process flow diagram;
Fig. 4 is the palm figure that has the structured light projection;
Palm image when Fig. 5 is structured light projection invariably;
The three-dimensional palm cloud data that the palmprint image sequence that Fig. 6 is a microcomputer by band structure light calculates.
(5) embodiment
The invention will be further described below in conjunction with drawings and Examples:
In conjunction with Fig. 1, projector 3 is connected on the video-out port (as the VGA interface) of control microcomputer 1, and in order to carry out other operation in projection, present embodiment uses the split screen technology, the content of a screen is outputed to projector, and the content of another screen outputs on the display 8.Ccd video camera 7 vertical palm rest area 5 are gathered this regional image.The primary optical axis of the primary optical axis of projector 3 and ccd video camera 7 is certain angle, is proper angles about 30 degree.The structured light that 3 projections of control microcomputer 1 control projector were encoded is to palm rest area 5.When the structured light projection is arranged, palm is placed thereon, then ccd video camera 7 will obtain as shown in Figure 3 the palm sequence of pictures that has structured light and deliver in the control microcomputer 1, and control microcomputer 1 can calculate the depth information of palm by these pictures that have structured light.Palm need keep static between projector's projective structure photophase, otherwise the three dimensional point cloud that generates will have than mistake.When projector when projective structure light is not at palm, ccd video camera 7 can be gathered palm picture as shown in Figure 4, and this picture can be used for the location of two-dimentional palmmprint identification and three-dimensional palm print data.Certain stationary installation is installed in around the palm rest area 5, placement in a helpless situation approximately, make adopt the image standard of trying one's best.Shadow shield 6 is used for shading, prevents incoherent influence of light system effect.Transformer 2 is received on 220 volts the civil power, finishes after the step-down to projector 3 and ccd video camera 7 power supply is provided.Ccd video camera 7 and projector 3 all are fixed on the cabinet 4.In system initialisation phase, reference planes are determined in the operation that need calibrate, and making it highly is 0, and reference planes are parallel to palm rest area 5, and in its vicinity.
In conjunction with Fig. 2, left hand palm fixed leg 9, right hand palm fixed leg 11, middle palm fixed leg 12 is used for fixing palm, and finger opens and keeps flat, because the effect of three steady arms, scope of activities is smaller.Palm rest area 5 in light hole 10 corresponding diagram 1, this regional palm are exposed projector 3 and ccd video camera 7 times, and the information of palmmprint central area is hunted down and is used for identification.
In conjunction with Fig. 3, on the system controlled by computer projector projective structure photoconduction palm, obtain the image that has structured light by capture card and ccd video camera simultaneously, again image sequence is analyzed, obtain three dimensional point cloud.Being used for follow-up identity after data process filtering and the format conversion differentiates.Generate some width of cloth coded images by computing machine, comprising sinusoidal phase shift figure and black and white strip figure, the image of generation projects testee surface (palm) by projector, and object is carried out space encoding.
In conjunction with Fig. 4, projector's projection is caught the image that obtains through structured light palm in one's hands after the phase-shift coding through ccd video camera 7.The coded system of projector can have multiple, can be according to speed, and the quality of three-dimensional point cloud is chosen.Present embodiment is chosen according to the quality of speed and three-dimensional point cloud, coding method is for adopting the sinusoidal gray scale image coding of timesharing, throw several, generally be more than 4 width of cloth, camera acquisition has the reference planes image and testee surface image of structured light to several after, go parcel to resolve, thereby obtain the phase differential on reference planes and testee surface.According to the triangle proportionate relationship,, calculate the relative height of reference planes and testee by phase differential.
In conjunction with Fig. 5, projector is projective structure light not, and this moment, video camera obtained the gray level image of palm, and this image can be used for traditional two-dimentional identification, can also be used to the location of three-dimensional data etc.So the algorithm of two-dimentional palm print identity identification is suitable equally in the present embodiment instrument, further be that two-dimentional palmmprint identification result, three-dimensional palm print identification result can be realized on same equipment, so can realize merging, improve final identification result.
In conjunction with Fig. 6, after the control microcomputer obtains to have the palmprint image sequence of structured light, calculate the palm height on relative reference plane and the three dimensional point cloud that obtains everywhere.Cloud data contains the abundant spatial information of palm, can be used for identity to differentiate.
Claims (10)
1. three-dimensional palm print identity identifier, it comprises cabinet, projector, video camera and control microcomputer, it is characterized in that: cabinet is provided with palm rest area, palm rest area is provided with the light hole and the fixing palm locating device of palm, projector and video camera are arranged in the cabinet and are connected transformer, the plane that the vertical palm of video camera is placed also connects the control microcomputer, projector and video camera center column are 30-45 degree angle and intersect at the palm rest area central area, and projector connects the control microcomputer by the VGA interface.
2. three-dimensional palm print identity identifier according to claim 1 it is characterized in that: further comprising the display that is arranged on the cabinet outside, and display connects the control microcomputer.
3. three-dimensional palm print identity identifier according to claim 2 is characterized in that: also be provided with shadow shield on the described cabinet, the parallel palm rest area setting of shadow shield.
4. three-dimensional palm print identity identifier according to claim 3, it is characterized in that: described palm locating device comprises left hand palm fixed leg, right hand palm fixed leg and the middle palm fixed leg that is arranged on palm rest area, and middle palm fixed leg is arranged between left hand palm fixed leg and the right hand palm fixed leg.
5. three-dimensional palm print identity identifier according to claim 4 is characterized in that: described projector and video camera center column are 30 degree angles and intersect at the palm rest area central area.
6. three-dimensional palm print identity identifier according to claim 4 is characterized in that: described projector is the LED projector of small size.
7. three-dimensional palm print identity discrimination method, it is characterized in that: at first carry out system initialization, projector is connected on the control microcomputer by the VGA interface, program timesharing on the control microcomputer changes screen content, screen content carries out phase-shift coding, thereby produce the structured light of encoding, the phase-shift structure light palm in one's hands that projector's timesharing ground projection was encoded, video camera is gathered the palm image that has structured light by the same time interval and is delivered in the control microcomputer, the control microcomputer obtains having behind the multiple image of structured light and to obtain each sampled point of palm image according to the information in the image is the depth information on relative reference plane with respect to the distance of reference planes, form the cloud data of the three-dimensional palm of point sampling, control the space structure that utilizes three-dimensional point cloud formation palm that Microcomputer Calculation goes out each sampled point of palm at last.
8. three-dimensional palm print identity discrimination method according to claim 7, it is characterized in that: the production process of described phase-shift structure light is: generate some width of cloth coded images by computing machine, comprising sinusoidal phase shift figure and black and white strip figure, the image that generates projects tested palm surface by projector, object is carried out space encoding, and the coded system of projector is for adopting the sinusoidal gray scale image coding of timesharing.
9. three-dimensional palm print identity discrimination method according to claim 8, it is characterized in that: described each sampled point is the depth information of trying to achieve the relative reference plane of each point by the relation between the respective pixel with respect to the method that obtains of the distance of reference planes, camera acquisition has the reference planes image and testee surface image of structured light to several after, go parcel to resolve, thereby obtain the phase differential on reference planes and testee surface.According to the triangle proportionate relationship,, calculate the relative height of reference planes and testee by phase differential.
10. three-dimensional palm print identity discrimination method according to claim 9 is characterized in that: described in system initialisation phase, reference planes are determined in the operation that need calibrate, and making it highly is 0.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819629A (en) * | 2010-04-08 | 2010-09-01 | 西京学院 | Supervising tensor manifold learning-based palmprint identification system and method |
| CN101923641A (en) * | 2010-09-09 | 2010-12-22 | 北京交通大学 | Improved human face recognition method |
| CN102073861A (en) * | 2011-01-05 | 2011-05-25 | 哈尔滨工程大学 | Non-contact device for acquiring image with palmprint and three-dimensional hand shape on line |
| CN101794376B (en) * | 2010-01-26 | 2012-02-01 | 哈尔滨工程大学 | Multi-mode biological image acquisition device for three-dimensional hand shape and palmprint |
| CN102509094A (en) * | 2011-11-25 | 2012-06-20 | 哈尔滨工业大学深圳研究生院 | Structured-light-based embedded 3D (three dimensional) fingerprint collecting method and system |
| CN103729622A (en) * | 2013-12-24 | 2014-04-16 | 小米科技有限责任公司 | Finger vein three-dimensional point cloud obtaining method and device and terminal |
| CN106643555A (en) * | 2016-12-27 | 2017-05-10 | 清华大学 | Connection piece identification method based on structured light three-dimensional measurement system |
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
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2007
- 2007-12-25 CN CNA2007101449130A patent/CN101196986A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794376B (en) * | 2010-01-26 | 2012-02-01 | 哈尔滨工程大学 | Multi-mode biological image acquisition device for three-dimensional hand shape and palmprint |
| CN101819629A (en) * | 2010-04-08 | 2010-09-01 | 西京学院 | Supervising tensor manifold learning-based palmprint identification system and method |
| CN101819629B (en) * | 2010-04-08 | 2013-01-23 | 西京学院 | Supervising tensor manifold learning-based palmprint identification system and method |
| CN101923641A (en) * | 2010-09-09 | 2010-12-22 | 北京交通大学 | Improved human face recognition method |
| CN101923641B (en) * | 2010-09-09 | 2012-08-08 | 北京交通大学 | Improved human face recognition method |
| CN102073861A (en) * | 2011-01-05 | 2011-05-25 | 哈尔滨工程大学 | Non-contact device for acquiring image with palmprint and three-dimensional hand shape on line |
| CN102509094A (en) * | 2011-11-25 | 2012-06-20 | 哈尔滨工业大学深圳研究生院 | Structured-light-based embedded 3D (three dimensional) fingerprint collecting method and system |
| CN103729622A (en) * | 2013-12-24 | 2014-04-16 | 小米科技有限责任公司 | Finger vein three-dimensional point cloud obtaining method and device and terminal |
| CN106643555A (en) * | 2016-12-27 | 2017-05-10 | 清华大学 | Connection piece identification method based on structured light three-dimensional measurement system |
| CN106643555B (en) * | 2016-12-27 | 2018-11-06 | 清华大学 | Connector recognition methods based on structured light three-dimensional measurement system |
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
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