CN109960963A - Contactless palmmprint acquisition device and its method - Google Patents
Contactless palmmprint acquisition device and its method Download PDFInfo
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- 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
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- 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
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Abstract
The invention discloses a kind of contactless palmmprint acquisition methods and devices, applied to the terminal device for having display and front camera, palmprint image is obtained by the camera, when illumination is undesirable, by the display for changing display, to change the illumination condition in palmmprint region, the resolution of palmmprint lines is improved.Palmmprint acquisition device of the invention and its method can directly apply to existing terminal device, without being further provided with hardware, the display for being changed display using number of ways is changed the illumination condition in palmmprint region using the display that terminal device carries, improves the resolution of palmmprint lines.
Description
Technical field
The present invention relates to palmprint recognition technology fields, more particularly to a kind of contactless palmprint recognition technology field.
Background technique
Biological identification technology is one of rising in recent years and combines the cross discipline of biology information technology and computer technology.
Biological identification technology refers to, utilizes human body itself intrinsic physical features such as sound, fingerprint, iris, eyeprint, face etc., or row
It is characterized such as signature, gait, a kind of technology of personal part is identified as the personalized characterization of people.Due to biological identification technology
Such as key, ID card, password are characterized compared to traditional identity, with not easy to lose, forgery difficulty is high, easy to use etc. excellent
Point, and with the fast development of computer technology in recent years, the connected applications of computer technology and bio-identification become life
The research hotspot in object identification field.
In numerous biological identification technologies, palmprint recognition technology is a kind of bio-identification mode emerging in recent years, is compared
In other biological identification technology, personal recognition is had the advantage that
1) recognition of face requires illumination high, simultaneously because the variations such as the expression of people, dressing will lead to misclassification rate height, rejection
Rate is high, and there is also the similar people of appearance for recognition of face by the safety issue of identification, and palmprint image less by light,
The interference such as expression, makeup, misclassification rate and reject rate are lower, and since the palmmprint of each individual has its uniqueness, palmmprint is known
Not it is possible to prevente effectively from the similar bring safety problem of appearance；
2) iris, eyeprint identification are the most common biological identification technologies in films and television programs, although accuracy of identification is higher,
Expensive, the demanding disadvantage of environment-identification that there are equipment, and the acquisition of palmmprint is lower to environmental requirement (such as intensity of illumination), and
Identify that without considering injury of the strong light to eyeball in palmmprint collection process, therefore light control is more simple compared to iris, eyeprint
Easily, acquisition equipment cost is more cheap；
3) although fingerprint recognition is a kind of biological identification technology of early start research and application, and technical maturity is higher,
But finger areas area is small to cause finger print information capacity limited, and it is usually necessary to use the identification methods of contact with to the greatest extent for fingerprint recognition
Details in fingerprint may mostly be obtained, but since human body is easy to leave the characteristic of fingerprint in body surface, fingerprint is easy to be obtained by other people
It takes and forges, and be equally covered with mastoid process line on palm, since the area of palm is far longer than finger, palmmprint contains than fingerprint more
Horn of plenty distinguishes information, and duplicate probability is lower；In addition, big main line and other fold lines are distributed on palm, more hold
Feature point, line, surface are easily extracted from image, there is very strong separating capacity and noise resisting ability, even therefore low resolution
Rate, strong noise palmprint image can still complete to identify；
4) with gait and signature etc. compared with dynamic behaviours feature, palm print characteristics it is more stable with it is consistent, accuracy of identification is higher.
In usage mode, biological identification technology can be divided into contact and contactless two major classes, contact refer into
During row bio-identification, some position of human body, which needs to have with identification equipment, directly to be contacted to enable the sensor to obtain
Identified biological characteristic；Contactless to refer to during carrying out bio-identification, human body and identification equipment are without any direct
Contact the acquisition of biological characteristic can be completed, extract and identification, such as iris, eyeprint, face.Contactless bio-identification
Technology has many advantages, such as that application scenarios are extensive, identification process is flexible, health and leave no trace, have become now bio-identification neck
The mainstream research direction in domain.
However, existing palmprint recognition technology in order to guarantee the acquisition precision of palm characteristic area, is all used mostly and is connect
Touch collector, there are health concerns when not only using in public places, also result in personal recognition and identify relative to other biological
The advantages such as the environmental requirement that technology has is low, equipment cost is cheap, accuracy of identification is high, speed is fast are had a greatly reduced quality.Also, it is utilizing
During camera acquires palmprint image, due to natural light or the influence of partially white, inclined yellow light, clearer palmmprint can not be obtained
Lines image also limits the application of personal recognition.
In conclusion this field needs to research and develop a kind of new palmmprint acquisition methods, by non-contacting usage mode, into one
Step reduces requirement of the identification process to hardware, environment, ensure that higher personal recognition degree.
Summary of the invention
To solve the above-mentioned problems, first aspect present invention provides a kind of contactless palmmprint acquisition methods, described non-
Contact palmmprint acquisition methods are applied to the terminal device with display and front camera, comprising steps of by before described
It sets camera and obtains palmprint image, when illumination is undesirable, by changing the display of display, to change the illumination of palm area
Condition improves the resolution of palmmprint lines；Wherein, the method for changing the display of display one or more of is selected from the group:
(1) brightness value of display is turned up；
(2) exhibit high brilliance background；Or
(3) it is displayed in blue or the background of purple.
In another preferred example, Real-time Feedback is provided on the display of the terminal device, for guiding palm to be placed in
Suitable position.
In another preferred example, the undesirable determination method of the illumination uses one or more of:
(a) terminal equipment configuration has ambient light sensor, senses current environment light using the ambient light sensor
Intensity of illumination is determined as that illumination is undesirable when the environment light intensity of illumination is less than or equal to the first preset value；
(b) gray value for analyzing the palmprint image is determined as when the gray value is less than or equal to the second preset value
Illumination is undesirable；Or
(c) contrast for analyzing the palmprint image determines when the contrast value is less than or equal to third preset value
It is undesirable for illumination.
In another preferred example, the background and the Real-time Feedback are layering or split screen setting.
In another preferred example, the Real-time Feedback is selected from the group:
(i) a static instruction, for guiding palm to be placed in suitable position；
(ii) real-time video, all or part of figure that the real-time video is obtained from the front camera
Picture；Or
(iii) dynamic instruction, be used to indicate palm whether be detected, the palm present position that is detected of instruction and/
Or the moving direction of guidance palm.
In another preferred example, the static instruction and/or dynamic instruction are respectively selected from the group: arrow, wire frame, blank map and
Text.
In another preferred example, the static instruction is located at the background.
In another preferred example, a background and a real-time video are shown on the display simultaneously.
In another preferred example, whether this method further comprises the steps of: detects in the image that the camera obtains comprising hand
The palm, if it is, the position of positioning palm in the images, and the dynamic instruction is shown on the display.
In another preferred example, the background is set as translucent, is placed in the front of the real-time video.
In another preferred example, the background and the real-time video split screen.
In another preferred example, the boundary of the background and the real-time video split screen is as a static instruction.
In another preferred example, the static instruction or dynamic instruction are located at the background and/or the real-time video
Region.
Second aspect of the present invention provides a kind of contactless face acquisition methods, by above-mentioned contactless palmmprint acquisition side
Palmmprint in method replaces with face.
Third aspect present invention provides a kind of contactless eyeprint acquisition methods, by above-mentioned contactless palmmprint acquisition side
Palmmprint in method replaces with eyeprint.
Fourth aspect present invention provides a kind of contactless palmmprint acquisition device, including one on a terminal device
Display and a front camera, wherein the front camera is used for for obtaining palmprint image, the display in illumination
When undesirable, by changing the display of display, to change the illumination condition in palmmprint region, the resolution of palmmprint lines is improved；
Wherein, the method for changing the display of display one or more of is selected from the group:
(1), the brightness value of display is turned up；
(2), exhibit high brilliance background；Or
(3), it is displayed in blue or the background of purple.
In another preferred example, the contactless palmmprint acquisition device further includes a range sensor, for sensing hand
The distance between the palm and the front camera.
Compared with prior art, the present invention has the advantage that
(1) palmmprint acquisition methods of the invention can be customized to be independent contactless fingerprint identification device, directly answer
For existing terminal device, such as personal mobile device, the display carried using terminal device, camera, environmentally sensitive
Detection, acquisition, identification, matching and the feedback of the hardware realizations palmmprint such as device, range sensor, processor chips, without in addition
It is equipped with hardware, is greatly expanded application field and range；
(2) contactless palmmprint acquisition methods of the invention beautify difference with conventional taking pictures, not by the soft of image
Degree etc. is used as evaluation index, and is to obtain the enough palm print informations of biological characteristic, not beautifies palmprint image；
(3) in palmmprint acquisition methods of the invention, change the display of display using number of ways, certainly using terminal device
The display of band changes the illumination condition in palmmprint region, improves the resolution of palmmprint lines；
(4) palmmprint acquisition methods of the invention also provide better man-machine interaction mode, on the display of terminal device
Region with the palmprint image that can be acquired with real-time display front camera also has instruction either statically or dynamically to guide use
Family adjusts palm position, distance or posture
(5) under the premise of guaranteeing accuracy of identification, the display for changing display can be achieved at the same time on the terminal device and draw
Lead function, and carry out light filling in the prior art using display, display would generally stop in light filling display image or
It indicates and full frame highlighted (or brilliant white), therefore user is unable to get feedback or guidance in light filling；
(6) palmmprint acquisition methods of the invention make identification process it is more efficient, operation it is more easy, environment-identification is wanted
It asks low, is applicable not only to the identification certification of personal device, the more people for being also suitable for public place simultaneously authenticate.
Detailed description of the invention
It can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Fig. 1 shows that contactless palmmprint acquisition device provided by the present invention carries out the flow chart of personal recognition；
Fig. 2 shows that structure when contactless palmmprint acquisition device provided by the present invention is applied on terminal device is shown
It is intended to；
Fig. 3 shows the schematic diagram of display picture in contactless palmmprint acquisition methods provided by the present invention；
Fig. 3 a shows the example one of Real-time Feedback；
Fig. 3 b shows the example two of Real-time Feedback；
Fig. 3 c shows the example three of Real-time Feedback.
Specific embodiment
The specific embodiment that the invention will now be described in detail with reference to the accompanying drawings.However, the present invention should be understood as to not office
It is limited to this embodiment described below, and technical concept of the invention can be with other well-known techniques or function and those
The identical other technologies combination of well-known technique is implemented.
In the explanation of following specific embodiments, structure and working method of the invention in order to clearly demonstrate will be by all
Multidirectional word is described, but should by "front", "rear", "left", "right", "outside", "inner", " outside ", " inside ",
The Word Understandings such as " axial direction ", " radial direction " are not construed as word of limitation for convenience of term.
Term is explained
High brightness background: referring to the background with certain brightness, that is, reaches so that the sufficient brightness of display background is to illuminate
Palmprint image region can be realized by the brightness value or exhibit high brilliance background that display is turned up in the present invention.
Include the light that palmprint image contrast can be improved in high brightness background of the present invention, for blue light, purple light or can contain
The complex light of blue light, purple light wave band.In particular, being between 400nm-480nm in high brightness background comprising wavelength has relatively
The light of higher-energy.The high brightness background helps to obtain accurate palm print information, and purpose is not intended to beautification palmprint image,
Therefore there are essential distinctions with using white light, yellow light etc. as supplementary lighting sources in the prior art.
First preset value: in the present invention, the first preset value refers to preset illumination intensity value, current environment light illumination
Value is less than or equal to the scene of first preset value, can be used as undesirable one of the criterion of illumination.Those skilled in the art
Member can be set according to the case where external environmental light illumination value of the configuration of the camera of terminal device and their location, this hair
It is bright do not do it is specifically limited.For example, it is assumed that the minimum illumination of palm personal recognition is required to need 10lux, and ambient lighting value is low
Under the scene of 10lux, the display of display can be changed, guarantee to reach 10lux in the intensity of illumination of palm palmmprint part, to obtain
Obtain clearly palmprint image.For another example ambient light sensor judge current environment illumination intensity value whether meet demand, if not
Meet, then exhibit high brilliance background over the display, simultaneously or after also adjustable height display brightness value.
Second preset value: in the present invention, the second preset value refers to preset gray value of image, the palm area of acquisition
When gray value is less than or equal to second preset value, undesirable one of the criterion of illumination can be used as.Second preset value
It can be according to the reject rate (FRR, false rejection rate) and misclassification rate (FAR, False Accept of palmprint image
Rate requirement), scene that palmmprint obtains, terminal device chip performance situations such as configure.
Third preset value: in the present invention, third preset value refers to preset image contrast value, the palm area of acquisition
Contrast value be less than or equal to the third preset value when, can be used as undesirable one of the criterion of illumination.Contrast value
Measure palm area in image it is most bright it is white and most dark it is black between different brightness levels, bigger representatives of disparity range compare more
Greatly.The third preset value can according to the reject rate (FRR, false rejection rate) and misclassification rate of palmprint image (FAR,
False Accept Rate) requirement, the scene that palmmprint obtains, terminal device chip performance situations such as configure.
Preferably, environment light illumination value and the first preset value, the gray value in palmmprint region and the second preset value, palmmprint region
Contrast value can be carried out simultaneously compared with third preset value, for example, determine palmmprint region gray value it is too low when, Ke Yigai
Become the display of display；Determine that the gray value in palmmprint region meets the requirements, and when contrast value is too low, it also can change display
Display.
Real-time video: all or part of image acquired in the front camera obtains a continuous video, nothing
User is needed to trigger, in the case where determining that illumination is undesirable, the feedback for being referred to real-time video constantly changes display
It has been shown that, such as the brightness value of display is turned up and keeps the brightness value until the process of personal recognition finishes.
Real-time Feedback: referring on the display of terminal device, for guiding the position of palm placement, checking palm
The currently detected palm position of real-time display situation over the display, instruction or the area for the moving direction for guiding palm
Domain, including static instruction, real-time video, dynamic instruction etc., above-mentioned three can individually or simultaneously exist.Display in the present invention
Video area visual user demand or the layering of interface demand or split screen setting in background and Real-time Feedback.
The 1-3 specific embodiment that the present invention will be described in detail with reference to the accompanying drawing.
Embodiment one:
As shown in Figure 1, carrying out the flow chart of personal recognition, packet for contactless palmmprint acquisition device provided by the present invention
Include the processes such as camera image acquisition, palm detection, image analysis processing and personal recognition.
Palm is placed in terminal device (the including but not limited to mobile phone, flat with display and front camera by user
The portable equipments such as plate computer) before, camera reads in camera image 101 frame by frame, obtains the palm print information of user, and palm detects mould
Whether block 102 carries out palm detection, judge comprising palm (P103) in camera image 101, if not including palm, provides anti-
Feedback-does not have palm (P115), if positioning palm area (P104) comprising palm, i.e., further detects palm in display
Whether the location of middle, palmprint image size, while providing feedback (P116) of palm position and judge palm position
Meet personal recognition requirement (P105), such as integrity degree, resolution ratio etc., if being unsatisfactory for the requirement of integrity degree or resolution ratio,
The feedback (P117) of adjustment palm position is provided, if it is satisfied, then generating the image (106) of mark palm and passing it to figure
As analysis and processing module 107.
In the above process, contactless palmmprint acquisition device provided by the present invention is suitable for display and preposition takes the photograph
As the terminal device of head, can in the case where being assisted without other hardware (including but not limited to external infrared camera),
Only by the image of included front camera shooting, in the open space for not limiting illumination condition, palm detection is carried out, it is real
When judge in camera image, when camera image includes palm, palm to be accurately positioned in camera whether comprising palm
Locating region in image.Based on the positioning palm area, current palm position can be provided to user in real time by display
The feedback (P116) set, if current location improper (too far, or deflect away from camera visual angle etc.) can also be by being shown as
User provides the instruction (P117) for how adjusting palm position.
The process flow of image analysis processing module 107 is as follows: whether analysis picture quality is qualified (P108) first, judgement
Whether the image 106 of above-mentioned mark palm meets the requirement of personal recognition, for example, palmprint image gray scale and/or contrast whether
Enough, if the requirements are not met, provides the feedback (P118) of adjustment camera parameter, carries out image preprocessing if meeting
(P109), which includes but is not limited to remove noise and image enhancement etc., and the pretreatment image 110 of generation is transmitted to
Personal recognition module 111, personal recognition module 111 include palmmprint registration module 112 and palmprint match module 113.
It calls palmmprint registration module 112 to carry out palmmprint registration, pretreatment image 110 is generated into palmmprint template 114, by palmmprint
Template 114 saves and feeds back succeed in registration (P119)；When carrying out the tasks such as authentication, palmprint match module 113 is called, it will
The one or more palmmprint templates 114 saved in pretreatment image 110 and system are matched and feed back matching result
(120)。
Above-mentioned palmmprint acquisition device carries out the various modules used during personal recognition and feedback procedure is merely illustrative
Property description, those skilled in the art suitably can replace or delete as needed certain steps to realize identical effect.
Embodiment two:
Fig. 2 shows structural schematic diagram when contactless palmmprint acquisition device of the invention is applied on terminal device.
The terminal device with display and front camera includes: one or more displays 201, one or more acquisition image
Camera 202, terminal device mainboard 203, credible performing environment 206, the terminal device mainboard 203 include device handler
204 and device memory 205, performing environment 206 that this is credible includes operation mould group 207 and storage mould group 208.
Preferably, should terminal device with display and front camera can also include ambient light sensor 213, away from
From sensor 214, motion sensor 215 and flash lamp 216, wherein ambient light sensor 213, range sensor 214, movement
Sensor 215, flash lamp 216 all can be (including but not limited to, central by the processor 204 of terminal device mainboard 203 and equipment
Processor CPU is connected with graphics processor GPU), and device memory 205 is for storing palmmprint template 114.Terminal device mainboard
Personal recognition module 209 is run on 203, which includes palm detection module 210, image analysis processing mould
Block 211, the registration of palmmprint template and palmprint match core mould group 212, personal recognition module 209 pass through with camera 202, display
The external hardwares such as device 201 are associated, and both available image and sensor input, also can control the parameter of adjustment external hardware
And operation result is fed back into user by display.
Preferably, the distance between user's palm and camera can be detected by range sensor 214.Work as Distance-sensing
Device 214 perceive distance less than a given threshold when, at this time due to camera limited viewing angle, only part palm image as it can be seen that
Palm detection module 102 can not be called, then user can be reminded to check whether palm position is excessively close from camera by display 201
Or exceed certain angle, until user adjust it is visible to largely or entirely palm image.
Personal recognition module 209 is embedded in the device handler 204 of the terminal device with display and front camera
In device memory 205.
Preferably, when providing a credible performing environment 206 in terminal device, the registration of palmmprint template and palmprint match core
Heart mould group 212 can also carry out in credible performing environment 206 in whole or in part.In the present invention, in the undesirable item of illumination
, can be by the display of change display 201 under part, 201 brightness of display for adjusting terminal device is sufficiently high, with exhibit high brilliance
Background is used for light filling.
Embodiment three:
Fig. 3 shows the schematic diagram of display picture in contactless palmmprint acquisition methods provided by the present invention.Terminal
The display 201 of equipment provides Real-time Feedback for user, and guidance palm is placed in suitable position.
Fig. 3 a shows the example one of Real-time Feedback.The Real-time Feedback may include a static instruction 33, for guiding palm
It is placed in suitable position.Static state instruction 33 includes but is not limited to arrow, wire frame, blank map, text etc..Preferably, static state refers to
Show that 33 can be the geometry frame of the frame of the palm or rectangle, circle, ellipse etc. on the other hand.Preferably, static instruction 33 can
Think the translucent blank map of palm shape.Preferably, static instruction 33 and the critical part of background 32 can configure explanatory note, refer to
Show that palm need to be placed in static state instruction 33 by user, or substantially by the frame of the boundary of the palm of user and static instruction 33
It is overlapped.
Preferably, when the transparent rate of background 32 is when different zones are inconsistent, the boundary of transparent rate variation can be used as static state
Instruction 33.Preferably, the boundary of transparent rate variation may be configured as palm shape, rectangle, circle, ellipse etc..
Fig. 3 b shows the example two of Real-time Feedback.The Real-time Feedback region may include a real-time video 31, the real-time view
Frequently the 31 all or part of image obtained from the front camera, user is in combination with real-time video 31 and static instruction
Palm is placed in suitable position by 33.Preferably, background 32 is set as translucent, is placed in the front of real-time video 31, back
The transparent rate of scape 32 can be consistent or inconsistent in different zones.
Fig. 3 c shows the example three in Real-time Feedback region.The Real-time Feedback region may include one or more dynamic instructions
34, for for guiding palmprint image position and/or guiding the moving direction of palm, which to include but is not limited to arrow
Head, wire frame, blank map and/or text.
Preferably, dynamic instruction 34 may include the frame or geometry frame (including but not limited to square of a palm shape
Shape, circle, ellipse), for prompting user to have been detected by palm, and the position of the palm detected in the display.
Preferably, dynamic instruction 34 may include translucent blank map or the translucent filling of geometry of a palm shape
Scheme (including but not limited to rectangle, circle, ellipse etc.), for prompting user to have been detected by palm, and the hand detected
The position of the palm in the display.
Preferably, dynamic instruction 34 may include that arrow or arrow animation are used to indicate user to the mobile hand of specific direction
The palm, and/or the distance for needing movement.
Preferably, dynamic instruction 34 may include explanatory note be used to indicate user to the mobile palm of specific direction, and/or
Mobile distance is needed, for example, prompt user " palm is please shifted near camera ".
Preferably, the areas transparent rate of background 32 can be set as 0, and the areas transparent rate of real-time video 31 can be set as 1, that is, show
One or more parts of most of region exhibit high brilliance background of device, display remaining area are set as all-transparent, at these
Real-time video 31 is shown in all-transparent region, while the boundary in above-mentioned all-transparent region can be used as static instruction 33, prompt user
Palm placement location.
Preferably, background 32 is arranged as grid or latticed, shows real-time video 31 in the white space of grid or grid.
Example IV:
Terminal device is utilized in the case where current environment illumination is sufficient using palmmprint acquisition methods provided by the invention
Included front camera directly acquires palmprint image；In current environment illumination deficiency or palm portion backlight, the illumination such as sidelight
In the case where undesirable, the palmprint image gray value of usually camera shooting at this time is low or contrast is low, is unable to satisfy palmmprint
The requirement of identification can improve palmmprint by changing the display of display 201 at this time to change the illumination condition of palm area
The resolution of lines.
The present invention illustratively provides following several scenes for determining that illumination is undesirable:
(a) terminal equipment configuration has ambient light sensor, strong using ambient light sensor sensing current environment light illumination
Degree is determined as that illumination is undesirable when the environment light intensity of illumination is less than or equal to the first preset value；
(b) image analysis processing module 107 analyzes the gray value in palmmprint region, when gray value is default less than or equal to second
When value, it is determined as that illumination is undesirable；Or
(c) image analysis processing module 107 analyzes the contrast in palmmprint region, when the contrast value is less than or equal to third
When preset value, it is determined as that illumination is undesirable.
When there is any of the above-described situation, show that the illumination condition for personal recognition is undesirable, adjustable height terminal device
Display 201 brightness value, display one high brightness background be displayed in blue or the background of purple carry out light filling.Preferably, it carries on the back
Scape 32 can be set to blue, i.e. the light of display emission is concentrated mainly on blue color spectrum, so that the palm that front camera obtains
The contrast of palmmprint lines is higher in print image.
Compared with prior art, contactless palmmprint acquisition device provided by the present invention and its method have following excellent
Point:
1) palmmprint acquisition methods of the invention can be customized to be independent contactless fingerprint identification device, directly apply
In existing terminal device, using the display of terminal device itself, camera, environmental sensor, range sensor, processor
Detection, acquisition, identification, matching and the feedback of the hardware realizations palmmprint such as chip, and can be whole using movement according to light conditions
The display of itself is held to carry out light filling；
2) better man-machine interaction mode is also provided, there is the palmmprint that can be acquired with real-time display camera on display
The region of image has instruction either statically or dynamically also to guide user to adjust palm position, distance or posture and guarantee to identify
Under the premise of precision；
3) in palmmprint acquisition methods of the invention, change the display of display using number of ways, certainly using terminal device
The display of band changes the illumination condition in palmmprint region, improves the resolution of palmmprint lines；
4) make that identification process is more efficient, more easy, to environment-identification the requirement of operation is low, be applicable not only to individual and set
Standby identification certification, the more people for being also suitable for public place simultaneously authenticate.
Unless otherwise instructed, the herein presented qualifier similar to " first ", " second " is not meant that suitable to the time
The restriction of sequence, quantity or importance, and be used for the purpose of the technical characteristic and another technology in the technical program
Feature is mutually distinguished.Similarly, the herein presented qualifier similar to " one " does not mean that the restriction to quantity, but describes
The technical characteristic not occurred above.Similarly, what is occurred before number herein is similar to " about ", " approximatively "
Modifier generally comprises this number, and its specific meaning should understand in conjunction with context meaning.Similarly, only have specific
Otherwise the noun of quantity quantifier modification should be regarded as again including plural form comprising singular, herein in the technology
It can include the odd number technical characteristic in scheme, also may include a plurality of technical characteristics.
It is preferred embodiment of the invention described in this specification, above embodiments are only to illustrate the present invention
Technical solution rather than limitation of the present invention.All those skilled in the art pass through logic analysis, reasoning under this invention's idea
Or the limited available technical solution of experiment, it all should be within the scope of the present invention.
Claims (17)
1. a kind of contactless palmmprint acquisition methods, which is characterized in that the contactless palmmprint acquisition methods are applied to have
The terminal device of display and front camera, comprising steps of by the front camera obtain palmprint image, when illumination not
When ideal, by changing the display of display, to change the illumination condition of palm area, the resolution of palmmprint lines is improved；
Wherein, the method for changing the display of display one or more of is selected from the group:
(1) brightness value of display is turned up；
(2) exhibit high brilliance background；Or
(3) it is displayed in blue or the background of purple.
2. contactless palmmprint acquisition methods as described in claim 1, which is characterized in that on the display of the terminal device
Real-time Feedback is provided, for guiding palm to be placed in suitable position.
3. contactless palmmprint acquisition methods as described in claim 1, which is characterized in that the undesirable judgement side of the illumination
Method uses one or more of:
(a) terminal equipment configuration has ambient light sensor, senses the illumination of current environment light using the ambient light sensor
Intensity is determined as that illumination is undesirable when the environment light intensity of illumination is less than or equal to the first preset value；
(b) gray value for analyzing the palmprint image is determined as illumination when the gray value is less than or equal to the second preset value
It is undesirable；Or
(c) contrast for analyzing the palmprint image is determined as light when the contrast value is less than or equal to third preset value
According to undesirable.
4. contactless palmmprint acquisition methods as claimed in claim 2, which is characterized in that the background and the Real-time Feedback
For layering or split screen setting.
5. contactless palmmprint acquisition methods as claimed in claim 2, which is characterized in that the Real-time Feedback is selected from down
Group:
(i) a static instruction, for guiding palm to be placed in suitable position；
(ii) real-time video, all or part of image that the real-time video is obtained from the front camera；Or
(iii) dynamic instruction, is used to indicate whether palm is detected, indicates the palm present position being detected, and/or draw
Lead the moving direction of palm.
6. contactless palmmprint acquisition methods as claimed in claim 5, which is characterized in that the static instruction and/or dynamic
Instruction is respectively selected from the group: arrow, wire frame, blank map and text.
7. contactless palmmprint acquisition methods as claimed in claim 5, which is characterized in that the static instruction is located at the back
Scape.
8. contactless palmmprint acquisition methods as claimed in claim 5, which is characterized in that display one simultaneously on the display
Background and a real-time video.
9. contactless palmmprint acquisition methods as claimed in claim 8, which is characterized in that comprising steps of detecting the camera shooting
It whether include palm in the image that head obtains, if it is, the position of positioning palm in the images, and on the display
Show the dynamic instruction.
10. contactless palmmprint acquisition methods as claimed in claim 8, which is characterized in that the background is set as translucent,
It is placed in the front of the real-time video.
11. contactless palmmprint acquisition methods as claimed in claim 8, which is characterized in that the background and the real-time view
Frequency division screen.
12. contactless palmmprint acquisition methods as claimed in claim 11, which is characterized in that the background and the real-time view
The boundary of frequency division screen is as a static instruction.
13. contactless palmmprint acquisition methods as claimed in claim 11, which is characterized in that the static instruction dynamically refers to
Show the region positioned at the background and/or the real-time video.
14. a kind of contactless face acquisition methods, which is characterized in that by the contactless palm described in the claims 1-13
Palmmprint in line acquisition methods replaces with face.
15. a kind of contactless eyeprint acquisition methods, which is characterized in that by the contactless palm described in the claims 1-13
Palmmprint in line acquisition methods replaces with eyeprint.
16. a kind of contactless palmmprint acquisition device, including the display and a front camera being located on a terminal device,
Wherein, the front camera is used for for obtaining palmprint image, the display when illumination is undesirable, is shown by changing
The display of device improves the resolution of palmmprint lines to change the illumination condition in palmmprint region；Wherein, change the display of display
Method one or more of be selected from the group:
(1), the brightness value of display is turned up；
(2), exhibit high brilliance background；Or
(3), it is displayed in blue or the background of purple.
17. contactless palmmprint acquisition device as claimed in claim 16, which is characterized in that the contactless palmmprint obtains
Device further includes a range sensor, for sensing the distance between palm and the front camera.
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Application publication date: 20190702 |