CN101571911B - Human face recognition system based on ultraviolet light source - Google Patents
Human face recognition system based on ultraviolet light source Download PDFInfo
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- CN101571911B CN101571911B CN2008100670328A CN200810067032A CN101571911B CN 101571911 B CN101571911 B CN 101571911B CN 2008100670328 A CN2008100670328 A CN 2008100670328A CN 200810067032 A CN200810067032 A CN 200810067032A CN 101571911 B CN101571911 B CN 101571911B
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Abstract
The invention relates to an image recognition technique and provides a human face recognition system based on an ultraviolet light source, which comprises an imaging device, a data processor and an optical system. The imaging device is used for collecting a human face image and giving the image to the data processor for image processing; the optical system is used for assisting the imaging of the imaging device and comprises an ultraviolet light source and an ultraviolet filter wherein the ultraviolet light source directly or indirectly projects a face recognition area; and the ultraviolet filter is positioned before a camera of the imaging device and matched with the wave length of the ultraviolet light source to filter visible light and infrared light. The human face recognition system can be used outdoor and overcomes the influence of environment light to the stability of a human face image in the prior art to obtain a relatively stable human face image, thereby improving the recognition rate.
Description
Technical field
The present invention relates to image recognition technology, more particularly, relate to a kind of face identification system based on ultraviolet source.
Background technology
Recognition of face is based on the biological identification technology of technology such as computing machine, Flame Image Process and pattern-recognition; Compare with other recognition technology (for example fingerprint recognition, iris recognition etc.); Have plurality of advantages such as easy, easy-to-use, health, noncontact and non-invasion, therefore be widely used in identification, identity validation and authentication field.For identification, can identify personage's identity according to facial image, whose problem solution is, for example in public security system, from database, finds criminal's identity according to criminal's photo; For identity validation and checking, judge whether the people's face in the image is the people of appointment, promptly solving is someone problem, to visitor's authentication, the visitor just allows to pass through for the competent person of appointment in for example safety inspection, the gate control system.In addition, the home entertaining field be can also be applied in, intelligent toy and robot of mastership etc. for example can be discerned.
Face recognition process generally includes three steps: facial image is gathered in (1); (2) face characteristic extracts; (3) face characteristic comparison.Detailed process is: gather human face image sequence through imaging device (like video camera, digital camera etc.), then these image sequences are sent to computing machine and handle; In computing machine, detection and location people face part from the image of input, and human face posture is being proofreaied and correct the characteristic information that people's face is extracted in the back; Facial image in the face characteristic database of face characteristic information to be identified and computing machine is compared the similarity of output comparison.
Obtain highly reliable, Human Face recognition effect, the face characteristic that is extracted should be able to reflect the essential characteristic of face, promptly can not change with skin color, facial hair, hair style, glasses, expression, attitude and light.But research shows, the image difference of the same people's face that is caused by light will be far longer than the image difference of different people face.What existing face recognition technology mainly relied on is environment light source.But in actual application, ambient light changes various, and particularly under outdoor environment, ambient light often changes, and is difficult to control.Because the external environment condition during each people's face information acquisition is different; The consistance of people's face data in the time of can not guaranteeing at every turn to gather; Because of the variation of environment light source can make the facial image that obtains that significant the variation taken place, cause the face characteristic information generation marked change of being extracted, error can appear when therefore carrying out people's face information comparison; Cause the accuracy rate of face characteristic comparison to descend; Therefore thereby influenced the performance of recognition of face, existing face identification system can only be in indoor use, big limitations the application of face identification system.
Natural light can be divided into visible light and non-visible light, and non-visible light can be divided into ultraviolet light and infrared light, and infrared light and visible light exist at occurring in nature in a large number; Be subject to the influence of environmental change, the infrared light that infrared light supply produces for ambient light to influence meeting lower, and the shared ratio of occurring in nature ultraviolet light is minimum; But its influence that changed by ambient light is minimum; Therefore, need a kind ofly obtain facial image, and then carry out the system of recognition of face based on ultraviolet source; Can be in outdoor application; And can overcome the influence of ambient light in the existing face recognition technology to facial image stability, thus obtain more stable facial image, improved discrimination.
Summary of the invention
The object of the present invention is to provide a kind of face identification system based on ultraviolet source, be intended to solve prior art since the influence of ambient light be useful in only indoor, and the not high problem of facial image stability.
For realizing goal of the invention; Said a kind of face identification system based on ultraviolet source comprises imaging device and data processor, and said imaging device is gathered facial image and given said data processor and carry out Flame Image Process; Also be included as the optical system that said imaging device is provided for auxiliary its imaging; Said optical system comprises ultraviolet source and ultraviolet filter, and said ultraviolet source directly or indirectly projects the face recognition zone, before said ultraviolet filter is positioned at the camera lens of said imaging device; Be complementary with the wavelength of said purple light light source, be used for filtering visible light and infrared light; Said optical system also comprises the ultraviolet light reflection unit, and said ultraviolet light reflection unit is positioned at the camera lens periphery of said imaging device, towards people's face, is used for ultraviolet light is reflected; Said ultraviolet source is positioned at around people's face, and towards said ultraviolet light reflection unit, the light that said ultraviolet source sends shines human face region after said ultraviolet light reflection unit reflection; Said ultraviolet source is UVA ultraviolet source, UVB ultraviolet source or UVC ultraviolet source.
Preferably, said ultraviolet filter be filtering visible light and infrared light and can be through the band of ultraviolet light the ultraviolet filtering eyeglass of logical type or cut-off type.
Preferably, the wavelength that the camera lens inside of said imaging device is added with said ultraviolet source is complementary, and is used for the plated film of filtering visible light and infrared light.
In the present invention is based on the face identification system of ultraviolet source; Said face identification system also comprises the analog-to-digital conversion module that is connected with said imaging device and said data processor; Anthropomorphic dummy's face image transitions that said analog-to-digital conversion module is used for said imaging device is collected is digital facial image, and gives said data processor with said digital facial image and carry out Flame Image Process.
In the present invention is based on the face identification system of ultraviolet source; Said face identification system also comprises database; Said database storing the human face image information of standard, said data processor adopts face recognition algorithms that the digital facial image that receives is carried out dividing processing, extracts human face image information; And with said database in the standard faces image information of storing compare the similarity of output comparison.
The present invention can effectively reduce the visible light and the ratio of infrared light in the ambient light through the ultraviolet source of auxiliary imaging is set, and avoids the influence that the variation of extraneous light forms images to people's face to greatest extent; Ultraviolet filter and the plated film that matees with ultraviolet source is set at the imaging device place; Can suppress visible light and infrared light, further strengthen the stability of people's face imaging, because ultraviolet light is not subject to the influence of environmental change; The present invention can be useful under the outdoor environment; Enlarged the applied environment of face identification system,, improved the discrimination of face identification system simultaneously because of the stability of the present invention's imaging; In addition; The present invention is reflected the light that ultraviolet source sends through the ultraviolet light reflection unit, make ultraviolet source can be located at people's face an end and need not be towards people's face, it can reduce that ultraviolet light directly shines people's face and the discomfort brought to the people.
Description of drawings
Fig. 1 is based on the system construction drawing of the face identification system of ultraviolet source among the present invention;
Fig. 2 is the work synoptic diagram of face identification system in one embodiment of the present of invention;
Fig. 3 is the fundamental diagram of one embodiment of the present of invention medium ultraviolet optical filter;
Fig. 4 is the work synoptic diagram of face identification system in an alternative embodiment of the invention;
Fig. 5 is the workflow diagram of face identification system in one embodiment of the present of invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows among the present invention the system construction drawing based on the face identification system of ultraviolet source, comprises optical system 200, imaging device 300, analog-to-digital conversion module 400, database 500 and data processor 600, wherein:
Analog-to-digital conversion module 400 is connected with data processor 600 with imaging device 300; The anthropomorphic dummy's face image transitions that is used for imaging device 300 is collected is digital facial image; And give data processor 600 with digital facial image and carry out Flame Image Process; In one embodiment, analog-to-digital conversion module 400 can be a video frequency collection card.
As shown in Figure 2, show the work synoptic diagram of face identification system in one embodiment of the present of invention, wherein, case panel 1 is fixing by bolt 2, and imaging device 300 is arranged in case panel 1, and the camera lens 3 of imaging device 300 is positioned at the centre position of case panel 1.
In one embodiment; Optical system 200 comprises ultraviolet source 4 and ultraviolet filter 5, and ultraviolet source 4 can directly project the face recognition zone, before ultraviolet filter 4 is positioned at the camera lens 3 of imaging device 300; Be complementary with the wavelength of ultraviolet source 4, be used for filtering visible light and infrared light.Like Fig. 2, in this embodiment, ultraviolet source 4 is positioned at camera lens 3 peripheries of imaging device 300, towards people's face 100, and 3 one-tenth centers symmetries of the camera lens of relative imaging device 300, this ultraviolet source 4 is UVA ultraviolet source, UVB ultraviolet source or UVC ultraviolet source.In one embodiment, this ultraviolet source 4 can UV-lamp or UV LED, can adopt UVA UV-lamp, UVB UV-lamp or UVC UV-lamp.
The touch keyboard 6 that is connected with imaging device 300 and ultraviolet source 4 also is housed on case panel 1, is used to control the switch of imaging device 300 and ultraviolet source 4, can be through touch keyboard 6 induction ultraviolet sources 4.
In the process that people's face 100 is discerned, keep the relative position of ultraviolet source 4 and imaging device 300 to fix, and the axis of the camera lens 3 of the projecting direction of ultraviolet source 6 and imaging device 300 is in an acute angle.When gathering facial image; Should keep the relative position of people's face plane and imaging device 300 of people's face 100 constant as far as possible; And keep people's face plane of people's face 100 vertical each other with the axis direction of the camera lens 3 of imaging device 300; When 4 pairs of people's faces 100 of ultraviolet source shone like this, the image that is obtained was the most stable.In the process that people's face 100 is discerned,, then can't use this system if the people wears the glasses that added the preventing ultraviolet plated film.
Open ultraviolet source 4 through touch keyboard 6 induction, the identified region of 4 pairs of people's faces 100 of ultraviolet source shines, and makes visible light and the ratio decline of infrared light in the identified region of people's face 100; And the ratio of ultraviolet light rises, particularly under outdoor environment, because the variation of outdoor environment light is various; The ratio of visible light and infrared light is bigger, and the ratio of ultraviolet light is relatively little, through the zone of people's face 100 is shone; Can effectively promote the ratio of ultraviolet light; And because ultraviolet light receives the influence of environment minimum, 300 pairs of people's faces 100 of imaging device are taken or when making a video recording, the imaging of people's face 100 is more stable.When mending ultraviolet light; Ultraviolet index is 0～2 grade; Because ultraviolet index almost can be ignored to the influence of human body 0～2 grade ultraviolet ray, under the common environment of nature, it does not almost have influence to human body skin; Belong to safe radiation scope, therefore can not adopt special strick precaution.In addition, because ultraviolet source 4 can also be used for artificial light, so the present invention can use under the indoor and outdoors environment.
Before the camera lens 3 of imaging device 300, also installed ultraviolet filter 5 additional; Be used for the filtering visible or infrared light; Influence with further attenuating ambient light; As shown in Figure 3, show the fundamental diagram of one embodiment of the present of invention medium ultraviolet optical filter 5, but ultraviolet filter 5 be filtering visible light and infrared light and can be through the band of ultraviolet light the ultraviolet filtering eyeglass of logical type or cut-off type.Ultraviolet filter 5 is complementary with the wavelength of ultraviolet source 4; Select for use the wavelength of purple light light source need cooperate the ultraviolet filter of identical wavelength just can make imaging device bring into play optimal usefulness; For example: use UVA (wavelength: 315-400nm), UVB (wavelength: 280-315nm) or UVC (wavelength: 100-280nm) during the ultraviolet source of three kinds of different wave lengths; Simultaneously also to cooperate the best ultraviolet filter of same wavelength transmission performance to use together; Can further effectively suppress visible light and infrared light like this, the ultraviolet light of a certain particular range of wavelengths can be passed through.
In one embodiment, also can not adopt ultraviolet filter 5, and the wavelength that is added with in camera lens 3 inside of imaging device 300 with ultraviolet source 4 is complementary, is used for the plated film of filtering visible light and infrared light, its principle is identical with the principle of ultraviolet filter 5.
As shown in Figure 4, be the work synoptic diagram of face identification system in an alternative embodiment of the invention, wherein; Case panel 1 is fixing by bolt 2, and imaging device 300 is arranged in case panel 1, and the camera lens 3 of imaging device 300 is positioned at the centre position of case panel 1; Ultraviolet light reflection unit 7 is housed on case panel 1; Camera lens 3 peripheries that it is positioned at imaging device 300 towards people's face 100, are used for ultraviolet light is reflected.
In this embodiment; Optical system 200 is included in ultraviolet source 4 and ultraviolet filter 5, and ultraviolet source 4 Indirect Projection are to the face recognition zone, before ultraviolet filter 4 is positioned at the camera lens 3 of imaging device 300; Be complementary with the wavelength of ultraviolet source 4, be used for filtering visible light and infrared light.Like Fig. 4; In this embodiment, ultraviolet source 4 be positioned at people's face 100 around, can with people's face plane of people's face 100 at grade; Also can be further along on people's face plane of people's face 100; Ultraviolet source 4 is towards ultraviolet light reflection unit 7, and the light that ultraviolet source 4 sends will shine people's face 100 zones after will passing through 7 reflections of ultraviolet light reflection unit again.Embodiment in the comparison diagram 2, this embodiment make ultraviolet source 4 can not shine directly on people's face 100, like this, avoided because light direct irradiation people face 100 and the discomfort brought to the people.
Ultraviolet source 4 is UVA ultraviolet source, UVB ultraviolet source or UVC ultraviolet source.In one embodiment, this ultraviolet source 4 can UV-lamp or UV LED, can adopt UVA UV-lamp, UVB UV-lamp or UVC UV-lamp.
Open ultraviolet source 4 through touch keyboard 6 inductions; Light that ultraviolet source 4 sends through 7 reflections of ultraviolet light reflection unit after, shine human face region, make visible light and the ratio decline of infrared light in the zone of people's face 100; And the ratio of ultraviolet light rises; 300 pairs of people's faces 100 of imaging device are taken or are made a video recording, because ultraviolet light receives the influence of environmental change minimum, make the imaging of people's face 100 more stable.
For further lowering the influence of ambient light to imaging; But before the camera lens 3 of imaging device 300, also can add the ultraviolet filter 5 of filtering visible light and infrared light; Also can not adopt ultraviolet filter 5; But the wavelength that is added with in camera lens 3 inside of imaging device 300 with ultraviolet source 4 is complementary, and is used for the plated film of filtering visible light and infrared light.Its principle is identical with embodiment among Fig. 2.
As shown in Figure 5, be the workflow diagram of face identification system in one embodiment of the present of invention, this flow process may further comprise the steps:
In step S501, start face identification system, can open imaging device 300 and ultraviolet source 4 through touch keyboard 6 inductions.
In step S502, when human body during near this face identification system, ultraviolet source 4 can shine the identified region of people's face 100.Ultraviolet source 4 can be set towards people's face 100, like the embodiment among Fig. 2,4 pairs of people's faces of ultraviolet source 100 carry out direct irradiation; Ultraviolet source 4 and people's face also can be set with on one side,, after the light that ultraviolet source 4 sends is reflected by ultraviolet light reflection unit 7, shine the identified region of people's face 100 again like the embodiment among Fig. 4.At this moment the ratio of the visible light of the identified region of people's face 100 and infrared light descends, and the ratio of ultraviolet light rises, because ultraviolet light receives the influence of external environment low, makes the present invention can be in outdoor application, and can obtain stable facial image.
In step S503, imaging device 300 is taken with ultraviolet source 4 irradiation area track human faces 100.This imaging device 300 can be video camera or digital camera, and its facial image that photographs is the simulation facial image.
In step S504, imaging device 300 will capture at least one frame facial image and reach analog-to-digital conversion module 400.
In step S505; Analog-to-digital conversion module 400 is digital facial image with anthropomorphic dummy's face image transitions; In one embodiment; Analog-to-digital conversion module 400 can be a video frequency collection card, and it is digital facial image with the anthropomorphic dummy's face image transitions that receives, and gives data processor 600 and carry out Flame Image Process.
In step S506; 600 pairs of facial images of data processor carry out dividing processing, extract human face image information, in one embodiment; Data processor 600 adopts face recognition algorithms that the digital facial image that receives is carried out dividing processing, extracts human face image information.
In step S507, data processor 600 is compared people's face information of storage in human face image information of extracting and the database 500, the similarity of output comparison.Database 500 has been stored the human face image information of standard; In one embodiment; The standard faces image information can be the standard faces image the shelves personnel, here can be personnel the shelves personnel with archive information, for example; In gate control system, can be the shelves personnel for allowing through the gate control system internal staff; In deposit card holder's authentication, can be legal holder for deposit card the shelves personnel; These information the shelves personnel have archives in the unit that uses face identification system, for example these personnel's name, age etc.
The mode of comparing has a variety of; For example, preestablish the threshold values of a comparison, facial image that calculating collects and each in the database 500 are opened the maximum similarity of facial image; If maximum similarity is greater than predefined threshold values; Judge that then the visit personnel are the competent person, send legal information, otherwise judge that the visit personnel are unauthorized person to external device 700; Send invalid information to external device 700, the external device 700 here can be such as access control system, supervisory system or complicated legal case archives economy etc.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. face identification system based on ultraviolet source; Comprise imaging device and data processor, said imaging device is gathered facial image and is given said data processor and carry out Flame Image Process, it is characterized in that; Also be included as the optical system that said imaging device is provided for auxiliary its imaging; Said optical system comprises ultraviolet source and ultraviolet filter, and said ultraviolet source directly or indirectly projects the face recognition zone, before said ultraviolet filter is positioned at the camera lens of said imaging device; Be complementary with the wavelength of said purple light light source, be used for filtering visible light and infrared light; Said optical system also comprises the ultraviolet light reflection unit, and said ultraviolet light reflection unit is positioned at the camera lens periphery of said imaging device, towards people's face, is used for ultraviolet light is reflected; Said ultraviolet source is positioned at around people's face, and towards said ultraviolet light reflection unit, the light that said ultraviolet source sends shines human face region after said ultraviolet light reflection unit reflection; Said ultraviolet source is UVA ultraviolet source, UVB ultraviolet source or UVC ultraviolet source.
2. the face identification system based on ultraviolet source according to claim 1 is characterized in that, said ultraviolet filter be filtering visible light and infrared light and can be through the band of ultraviolet light the ultraviolet filtering eyeglass of logical type or cut-off type.
3. the face identification system based on ultraviolet source according to claim 1 is characterized in that, the wavelength that the camera lens inside of said imaging device is added with said ultraviolet source is complementary, and is used for the plated film of filtering visible light and infrared light.
4. the face identification system based on ultraviolet source according to claim 1; It is characterized in that; Said face identification system also comprises the analog-to-digital conversion module that is connected with said imaging device and said data processor; Anthropomorphic dummy's face image transitions that said analog-to-digital conversion module is used for said imaging device is collected is digital facial image, and gives said data processor with said digital facial image and carry out Flame Image Process.
5. the face identification system based on ultraviolet source according to claim 1; It is characterized in that said face identification system also comprises database, said database storing the human face image information of standard; Said data processor adopts face recognition algorithms that the digital facial image that receives is carried out dividing processing; Extract human face image information, and with said database in the standard faces image information of storing compare the similarity of output comparison.
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| CN2008100670328A CN101571911B (en) | 2008-04-30 | 2008-04-30 | Human face recognition system based on ultraviolet light source |
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| CN2008100670328A CN101571911B (en) | 2008-04-30 | 2008-04-30 | Human face recognition system based on ultraviolet light source |
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| CN101571911B true CN101571911B (en) | 2012-07-04 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TW201329508A (en) * | 2012-01-04 | 2013-07-16 | Walsin Lihwa Corp | Device and method for protecting eyes |
| CN103336950A (en) * | 2013-07-01 | 2013-10-02 | 深圳市飞瑞斯科技有限公司 | Human face identification method and system |
| CN107077623A (en) * | 2014-11-13 | 2017-08-18 | 英特尔公司 | Image quality compensation system and method |
| CN105117633B (en) * | 2015-09-07 | 2018-07-03 | 三峡大学 | Recognition of face Windows system logins verify system |
| CN106778601A (en) * | 2016-12-13 | 2017-05-31 | 天津灵隆科技有限公司 | A kind of face identification system based on ultraviolet source |
| WO2020192384A1 (en) * | 2019-03-26 | 2020-10-01 | Shenzhen GOODIX Technology Co., Ltd. | Multizone illumination for optical face identification |
| DE102019206363B3 (en) * | 2019-05-03 | 2020-07-09 | Audi Ag | Motor vehicle with a device for color-dependent detection of image content and a computing device |
| CN111199221A (en) * | 2020-01-21 | 2020-05-26 | 成都国翼电子技术有限公司 | Device and method for improving face snapshot recognition rate in complex light environment |
| CN111325732B (en) * | 2020-02-20 | 2023-07-11 | 深圳数联天下智能科技有限公司 | Face residue detection method and related equipment |
| US11354924B1 (en) | 2021-05-17 | 2022-06-07 | Vr Media Technology, Inc. | Hand recognition system that compares narrow band ultraviolet-absorbing skin chromophores |
| US11232283B1 (en) * | 2021-05-17 | 2022-01-25 | Vr Media Technology, Inc. | Facial recognition system that compares narrow band ultraviolet-absorbing skin chromophores |
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| CN200950262Y (en) * | 2005-11-11 | 2007-09-19 | 北京数字奥森科技有限公司 | Mobile terminal |
| CN200986643Y (en) * | 2006-12-25 | 2007-12-05 | 上海非思智能科技股份有限公司 | Image sensing apparatus fit for multiple light environments |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200950262Y (en) * | 2005-11-11 | 2007-09-19 | 北京数字奥森科技有限公司 | Mobile terminal |
| CN200986643Y (en) * | 2006-12-25 | 2007-12-05 | 上海非思智能科技股份有限公司 | Image sensing apparatus fit for multiple light environments |
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