CN108388893A - A kind of fingerprint acquisition instrument - Google Patents
A kind of fingerprint acquisition instrument Download PDFInfo
- Publication number
- CN108388893A CN108388893A CN201810480553.XA CN201810480553A CN108388893A CN 108388893 A CN108388893 A CN 108388893A CN 201810480553 A CN201810480553 A CN 201810480553A CN 108388893 A CN108388893 A CN 108388893A
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- CN
- China
- Prior art keywords
- fingerprint
- light source
- described image
- finger
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
Abstract
The invention discloses a kind of fingerprint acquisition instruments, including shell, light source, image acquisition device, there is the accommodation space for accommodating finger on the shell, the bottom surface of the accommodation space is transparent plane, the light source and described image collector are placed in the lower section in the shell and positioned at the transparent plane, the accommodation space is used to slide above the transparent plane in a non-contact manner for the fingerprint face of finger, and the light source is used to illuminate the fingerprint face of finger so that described image collector acquires the fingerprint of finger.
Description
Technical field
The present invention relates to technical field of biometric identification, and in particular to a kind of fingerprint acquisition instrument.
Background technology
Traditional identity identifying method mainly proves identity by identity article and knowledge.Due to mainly by body
Foreign object, once proving that the marking articles of identity and knowledge are stolen or forget, identity is easy for being pretended to be or being replaced by other people.Especially
It is in current information-intensive society, the frequency of high-tech crime and harm show the zooming impetus.
Human body biological characteristics be our human bodies intrinsic various physiological characteristics or behavioural characteristic general name, have unique
Property, lifelong invariance, and will not pass into silence and lose, be not easy to forge or stolen, carry-on " carryings " and whenever and wherever possible can with etc.
Advantage, secrecy more safer than traditional identity identifying method and convenience.Physiological characteristic is mostly geneogenous, not with external
Condition and subjective desire change, such as fingerprint, palmmprint, iris, face；Behavioural characteristic is then that people for a long time form by life
Behavioural habits, it is difficult to change, such as person's handwriting, gait.
Wherein, the characteristic that the fingerprint of people has uniqueness and is basically unchanged all the life, and its complexity is enough to provide and is used for
Mirror another characteristic.Everyone fingerprint is substantially stationary, it is difficult to change, is easily obtained sample fingerprint, is easy to develop
It is identifying system, highly practical.Ten fingers of one people are different from, and the safety of system can be improved, and identify that the template of fingerprint is not
Fingerprint image, but the key feature extracted from fingerprint image.In this way so that storage will be much smaller than by storing the amount of storage of fingerprint template
Fingerprint image；According to legal provisions, the acquisition resolution of fingerprint image is 500dpi, and the gray level of image is 256, and Image Acquisition permits
Perhaps error is less than 1%.
Effect of the current contact push type fingerprint acquisition instrument in the moist finger of reply is excessively poor, when finger moistens
When, there is water membrane on fingerprint surface, this moisture film has filled and led up the sunk part between streakline, in this way, when finger is pressed into glass
When on plate, light and dark striped, fingerprint nature None- identified would not occur；And contact push type fingerprint collecting appearance
Easily contact glass plate on leave latent fingerprint, so also can it is dangerous and to identification cause certain interference.
Invention content
The main purpose of the present invention is to provide a kind of fingerprint acquisition instruments, to solve contact push type fingerprint recognition by humidity
Latent fingerprint leads to the problem of when finger etc. is interfered and contacted.
Fingerprint acquisition instrument provided by the invention adopts the following technical scheme that：
A kind of fingerprint acquisition instrument, including shell, light source, image acquisition device have the receiving for accommodating finger on the shell
The bottom surface in space, the accommodation space is transparent plane, and the light source and described image collector are placed in the shell simultaneously
Positioned at the lower section of the transparent plane, the accommodation space is used for the fingerprint face for finger in a non-contact manner described
Sliding above bright plane, the light source is used to illuminate the fingerprint face of finger so that described image collector acquires the finger of finger
Line.
Preferably, described image collector is line array CCD, and the fingerprint of finger is acquired by way of line scanning.
Preferably, the depth of field of described image collector and the thickness of finger match.
Preferably, the light source uses green light source, and wavelength is in 500-565nm.
Preferably, the fingerprint acquisition instrument further includes acquisition controller and light source controller, the light source controller and institute
Light source connection is stated, the acquisition controller connect unlatching/pass for controlling described image collector with described image collector
Close, the acquisition controller is also connect with the light source controller, for control unlatching/closing of the light source controller to
Control unlatching/closing of the light source.
Preferably, the fingerprint acquisition instrument further includes reservoir, image processor and Fingerprint Identification Unit；The reservoir point
Do not connect with described image processor and described image collector, for store described image collector acquisition fingerprint image and
Standard fingerprint image；Described image processor is connect with described image collector, is collected for handling described image collector
Fingerprint image；The Fingerprint Identification Unit is connect with described image processor, for by image processor treated fingerprint image
The similarity of picture and standard fingerprint image is identified.
Preferably, the accommodation space only allows finger to be slided in a manner of 0~10 ° with the bottom surface of the accommodation space
It crosses.
Preferably, the shell includes upper casing and lower casing, and the light source and described image collector are placed in the lower casing,
It is formed with the accommodation space between the upper casing and the lower casing, the bottom of the upper surface of the lower casing as the accommodation space
Face.
Beneficial effects of the present invention include：The present invention, can be to avoid moist hand by contactless carry out fingerprint collecting
The interference of finger and when avoiding contact with latent fingerprint generation.
Description of the drawings
Fig. 1 is the structural schematic diagram of the fingerprint acquisition instrument in the specific embodiment of the invention；
Fig. 2 is the structural schematic diagram of the fingerprint acquisition instrument in another specific embodiment of the present invention.
Specific implementation mode
Below against attached drawing and in conjunction with preferred embodiment, the present invention is further described.
The present invention provides a kind of fingerprint acquisition instrument, including shell, light source, image acquisition device, has on the shell and accommodates
The bottom surface of the accommodation space of finger, the accommodation space is transparent plane, and the light source and described image collector are placed in institute
The lower section in shell and positioned at the transparent plane is stated, the accommodation space is used for the fingerprint face for finger with non-contacting side
Formula is slided above the transparent plane, and the light source is used to illuminate the fingerprint face of finger so that described image collector acquires
The fingerprint of finger.
In other embodiments, one kind in acceptable preferably following scheme or preferably following in the absence of conflict
Arbitrary combination in scheme：
Described image collector is line array CCD, and the fingerprint of finger is acquired by way of line scanning.
The depth of field of described image collector and the thickness of finger match.
The light source uses green light source, and wavelength is in 500-565nm.
The fingerprint acquisition instrument further includes acquisition controller and light source controller, and the light source controller connects with the light source
It connects, the acquisition controller connect unlatching/closing for controlling described image collector with described image collector, described to adopt
Collection controller is also connect with the light source controller, for controlling unlatching/closing of the light source controller to described in control
Unlatching/closing of light source.
The fingerprint acquisition instrument further includes reservoir, image processor and Fingerprint Identification Unit；The reservoir respectively with institute
It states image processor to connect with described image collector, the fingerprint image and standard for storing the acquisition of described image collector refer to
Print image；Described image processor is connect with described image collector, for handling the collected fingerprint of described image collector
Image；The Fingerprint Identification Unit is connect with described image processor, for by image processor treated fingerprint image and mark
The similarity of quasi- fingerprint image is identified.
The accommodation space only allows finger to be slipped in a manner of 0~10 ° with the bottom surface of the accommodation space.
The shell includes upper casing and lower casing, and the light source and described image collector are placed in the lower casing, it is described on
It is formed with the accommodation space between shell and the lower casing, the bottom surface of the upper surface of the lower casing as the accommodation space.
In a specific embodiment, as shown in Figure 1, fingerprint acquisition instrument includes upper casing 20, lower casing 10, light source 31a and
31b, image acquisition device 60, light source 31a, 31b and image acquisition device 60 are placed in lower casing 10, are formed between upper casing 20 and lower casing 10
There is an accommodation space 70, the bottom surface 40 of the upper surface of lower casing 10 as accommodation space, bottom surface 40 is transparent plane, accommodation space
70 slide above bottom surface 40 in a non-contact manner for the fingerprint face for finger, and light source 31a and 31b are provided commonly for illuminating hand
The fingerprint face of finger is so that image acquisition device 60 acquires the fingerprint of finger.Wherein, in fingerprint collecting, the fingerprint of bottom surface 40 and finger
Face is opposite and accommodation space 70 limits finger and the bottom surface less parallel (angle is between 0~10 °) of accommodation space, finger with
Non-contacting approximately parallel mode is slided above bottom surface 40, and light source illuminates the fingerprint face of finger, through transparent bottom reflection
The positive fingerprint image of finger is collected by image acquisition device 60 afterwards.Image acquisition device uses line array CCD, is scanned by line
Mode acquire the fingerprint of finger, the resolution ratio and clarity of the fingerprint image obtained are all higher than the fingerprint image of Surface scan.
The contactless carry out fingerprint collecting scanned by line, can be to avoid the interference of moist finger and while avoiding contact with latent fingerprint
Generation.Since finger is at microarch type, the fingerprint face of entire finger is curved surface, and the fingerprint image caused, which may exist, to be lost
Very, it is image distortion problems caused by curved surface to avoid fingerprint face, in this example, the depth of field of preferred image collector and the thickness of finger
Degree matches, i.e., suitably increases the depth of field of image acquisition device, is distorted to avoid the fingerprint image of shooting, to according to scanning
Length velocity relation high speed obtains the fingerprint image of high-resolution, high quality.Light source is using the linear light source of green, and wavelength is in 500-
It is small to human injury between 565nm.
In another specific embodiment, as shown in Fig. 2, it is with embodiment shown in FIG. 1, difference lies in fingerprint collectings
Instrument further includes light source controller 50, acquisition controller (not illustrating in figure), reservoir (not illustrating in figure), image processor (figure
In do not illustrate) and Fingerprint Identification Unit (not illustrating in figure), light source controller 50 can be placed in lower casing 10, be connect with light source,
Acquisition controller, reservoir, image processor and Fingerprint Identification Unit can be integrated in computer 30 (certainly, in other examples
In son, acquisition controller, reservoir, image processor and Fingerprint Identification Unit can also be integrated in upper casing or lower casing), acquisition control
Device processed connect unlatching/closing for controlling image acquisition device with image acquisition device, and acquisition controller also connects with light source controller
Connect, for controlling unlatching/closing of light source controller to control unlatching/closing of light source, reservoir respectively with image procossing
Device is connected with image acquisition device, fingerprint image and standard fingerprint image for storing image acquisition device acquisition；Image processor
It is connect with image acquisition device, for handling the collected fingerprint image of image acquisition device；Fingerprint Identification Unit connects with image processor
It connects, for the similarity of image processor treated fingerprint image and standard fingerprint image to be identified.
It carries out fingerprint collecting and knows method for distinguishing and include the following steps：
(1), the fingerprint image of finger is obtained：Fingerprint acquisition instrument and computer 30 are opened, is adopted by acquisition controller startup
Collect program, light source controller 50 controls light source 31a and 31b and opens under the instruction control of capture program, the use of fingerprint to be collected
Downward, from left (right side) to the right side (left side), parallel sliding, finger slip over bottom surface to family finger at the uniform velocity above bottom surface 40 in accommodation space
Time control within the threshold range of setting, light source 31a and 31b illuminate the fingerprint face of finger, and image acquisition device acquisition refers to
The image of line, and it is sent to reservoir and image processor.
(2), the fingerprint image of acquisition is processed into details in fingerprint figure by image processor, further according to the biology of fingerprint minutiae
Characteristic carries out minutiae extraction to refinement fingerprint image；Image procossing includes the processing such as normalization, denoising, binaryzation, refinement, described
Minutiae extraction can such as using crestal line, there are bifurcation, endpoint and its directions as feature clicks through according to the biological characteristic of fingerprint
Row is extracted and is marked.
(3), Fingerprint Identification Unit is (such as registered before by the fingerprint image handled through image processor and standard fingerprint image
The fingerprint crossed) similarity be identified, finally judge whether two fingerprints are same fingerprints, when similarity be more than one setting
Threshold value, then identify success, on the contrary then fail.
The fingerprint acquisition instrument of the present invention can be also used for acquiring while the fingerprint of multiple fingers, can be in step (1)
The fingerprint of multiple fingers is acquired simultaneously, and the fingerprint image of acquisition is processed into details in fingerprint by the image processor in step (2)
Before figure, further include by fingerprint image be split into one by one interested region (if for example, acquiring simultaneously in addition to thumb
Four fingers fingerprint, then be divided into four interested regions, i.e. four respective fingerprint-blocks of finger), then to these
Region carries out minutiae extraction and processing.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those skilled in the art to which the present invention belongs, it is not taking off
Under the premise of from present inventive concept, several equivalent substitutes or apparent deformation can also be made, and performance or use is identical, all answers
When being considered as belonging to protection scope of the present invention.
Claims (8)
1. a kind of fingerprint acquisition instrument, it is characterised in that：Have including shell, light source, image acquisition device, on the shell and accommodates hand
The bottom surface of the accommodation space of finger, the accommodation space is transparent plane, and the light source and described image collector are placed in described
Lower section in shell and positioned at the transparent plane, the accommodation space be used for for finger fingerprint face in a non-contact manner
It is slided above the transparent plane, the light source is used to illuminate the fingerprint face of finger so that described image collector acquires hand
The fingerprint of finger.
2. fingerprint acquisition instrument as described in claim 1, it is characterised in that：Described image collector is line array CCD, passes through line
The mode of scanning acquires the fingerprint of finger.
3. fingerprint acquisition instrument as described in claim 1, it is characterised in that：The depth of field of described image collector and the thickness of finger
Match.
4. fingerprint acquisition instrument as described in claim 1, it is characterised in that：The light source uses green light source, and wavelength is in 500-
565nm。
5. the fingerprint acquisition instrument as described in Claims 1 to 4 any one, it is characterised in that：The fingerprint acquisition instrument further includes
Acquisition controller and light source controller, the light source controller are connect with the light source, the acquisition controller and described image
Collector connects unlatching/closing for controlling described image collector, the acquisition controller also with the light source controller
Connection, for controlling unlatching/closing of the light source controller to control unlatching/closing of the light source.
6. fingerprint acquisition instrument as claimed in claim 5, it is characterised in that：The fingerprint acquisition instrument further includes reservoir, image
Processor and Fingerprint Identification Unit；
The reservoir is connect with described image processor and described image collector respectively, for storing described image collector
The fingerprint image and standard fingerprint image of acquisition；
Described image processor is connect with described image collector, for handling the collected fingerprint image of described image collector
Picture；
The Fingerprint Identification Unit is connect with described image processor, for by image processor treated fingerprint image and standard
The similarity of fingerprint image is identified.
7. the fingerprint acquisition instrument as described in Claims 1 to 4 any one, it is characterised in that：The accommodation space only allows hand
Refer to be slipped in a manner of 0~10 ° with the bottom surface of the accommodation space.
8. the fingerprint acquisition instrument as described in Claims 1 to 4 any one, it is characterised in that：The shell includes upper casing under
Shell, the light source and described image collector are placed in the lower casing, and the appearance is formed between the upper casing and the lower casing
Receive space, the bottom surface of the upper surface of the lower casing as the accommodation space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480553.XA CN108388893A (en) | 2018-05-18 | 2018-05-18 | A kind of fingerprint acquisition instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480553.XA CN108388893A (en) | 2018-05-18 | 2018-05-18 | A kind of fingerprint acquisition instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108388893A true CN108388893A (en) | 2018-08-10 |
Family
ID=63070993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810480553.XA Pending CN108388893A (en) | 2018-05-18 | 2018-05-18 | A kind of fingerprint acquisition instrument |
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Cited By (2)
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| CN109447027A (en) * | 2018-11-09 | 2019-03-08 | 维沃移动通信有限公司 | Fingerprint acquisition device, fingerprint identification method and terminal |
| CN112257675A (en) * | 2020-11-18 | 2021-01-22 | 深圳市坶坭普电子科技有限公司 | Non-contact fingerprint acquisition device of rotatory shooting |
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| CN112257675A (en) * | 2020-11-18 | 2021-01-22 | 深圳市坶坭普电子科技有限公司 | Non-contact fingerprint acquisition device of rotatory shooting |
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