CN111898470A - Device and method for extracting fingerprint outside screen and terminal - Google Patents

Device and method for extracting fingerprint outside screen and terminal Download PDF

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CN111898470A
CN111898470A CN202010658466.6A CN202010658466A CN111898470A CN 111898470 A CN111898470 A CN 111898470A CN 202010658466 A CN202010658466 A CN 202010658466A CN 111898470 A CN111898470 A CN 111898470A
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processor
screen
fingerprint
sensor
camera
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CN111898470B (en
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帅川
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/22—Details of telephonic subscriber devices including a touch pad, a touch sensor or a touch detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/52—Details of telephonic subscriber devices including functional features of a camera
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Analysis (AREA)
  • Image Input (AREA)
  • Collating Specific Patterns (AREA)

Abstract

The invention provides an off-screen fingerprint extraction device, which comprises a sensor, a camera and a processor, wherein the processor is electrically connected with the sensor and the camera respectively; the sensor is used for calculating a distance value between a target object in an external space and the sensor and sending the distance value to the processor when the terminal is in a screen extinguishing state, the processor is used for judging whether the distance value is in a preset distance interval, and when the distance value is in the preset distance interval, the processor is also used for sending a shooting instruction to the camera head; the camera is used for shooting a picture of a target object when a shooting instruction is received and sending the picture to the processor, and the processor is also used for extracting a fingerprint image in the picture based on a skin color detection algorithm. The device for extracting the fingerprint outside the screen simplifies the manufacturing process of the terminal screen and saves the cost. In addition, the accuracy of the extracted fingerprint information is improved, and the accuracy of subsequent fingerprint comparison and screen unlocking is improved. The invention also provides an off-screen fingerprint extraction method and a terminal.

Description

Device and method for extracting fingerprint outside screen and terminal
Technical Field
The invention relates to the technical field of display, in particular to an off-screen fingerprint extraction device and method and a terminal.
Background
With the continuous improvement of the whole process design capability of the mobile phone, the aesthetic appearance of consumers is improved, and the mobile phone screen is gradually converted into a full-screen design from the previous diversified design. In the design of the comprehensive screen, the chip, the ultra-narrow frame, the notch and other related technologies are pasted on the flexible circuit board and are continuously promoted in a short time, and the screen occupation ratio is also promoted to 97% from 80%. In order to improve the screen occupation ratio, the screen is unlocked by mostly using an in-screen fingerprint identification technology. Fingerprint identification technique is directly in order to draw the fingerprint in order to integrate the cell-phone screen with the fingerprint module in the screen, and fingerprint identification technique has multiple in the screen at present stage, but fingerprint module is difficult to integrate in the fingerprint identification technique in most screens for cell-phone screen manufacturing process is complicated and the cost is high.
Disclosure of Invention
Therefore, it is necessary to provide an off-screen fingerprint extraction apparatus, an off-screen fingerprint extraction method, and a terminal, so as to solve the problems of complicated terminal screen manufacturing process and high cost caused by difficulty in integrating fingerprint modules in the existing in-screen fingerprint identification technology.
In a first aspect, an embodiment of the present invention provides an off-screen fingerprint extraction device, which is applied to a terminal, and the off-screen fingerprint extraction device includes a sensor, a camera, and a processor electrically connected to the sensor and the camera, respectively; wherein the content of the first and second substances,
the sensor is used for calculating a distance value between a target object in an external space and the sensor when the terminal is in a screen-off state, and sending the distance value to the processor, the processor is used for judging whether the distance value is in a preset distance interval, and when the distance value is in the preset distance interval, the processor is also used for sending a shooting instruction to the camera;
the camera is used for shooting a picture of the target object when the shooting instruction is received, and sending the picture to the processor, and the processor is further used for extracting a fingerprint image in the picture based on a skin color detection algorithm.
In some embodiments, the sensor is a distance sensor and the camera is a front-facing camera.
In some embodiments, the two endpoints of the preset distance interval are 1cm and 5cm respectively.
In some embodiments, the sensor and the camera are both located in a lower right corner region of the terminal.
In some embodiments, the processor is further configured to denoise the fingerprint image based on a maximum connected component algorithm.
In some embodiments, the processor is further configured to extract feature information in the fingerprint image after denoising, match the feature information with preset reference fingerprint information, and execute screen unlocking if matching is successful.
In some embodiments, the off-screen fingerprint extraction device further includes a memory electrically connected to the processor, and the memory is configured to store two endpoint values of the preset distance interval and the preset reference fingerprint information.
In a second aspect, an embodiment of the present invention provides a terminal, where the terminal includes an off-screen fingerprint extraction apparatus according to any one of claims 1 to 7.
In a third aspect, an embodiment of the present invention provides an off-screen fingerprint extraction method, which is applied to a terminal, where the terminal includes an off-screen fingerprint extraction device, the off-screen fingerprint extraction device includes a sensor, a camera, and a processor electrically connected to the sensor and the camera, respectively, and the off-screen fingerprint extraction method includes:
controlling the sensor to calculate a distance value between a target object in an external space and the sensor when the terminal is in a screen-off state, and sending the distance value to the processor;
controlling the processor to judge whether the distance value is in a preset distance interval or not, and controlling the processor to send a shooting instruction to the camera when the distance value is in the preset distance interval;
controlling the camera to shoot a picture of the target object when receiving the shooting instruction, and sending the picture to the processor;
controlling the processor to extract a fingerprint image in the photograph based on a skin color detection algorithm.
In some embodiments, the method for extracting an off-screen fingerprint further comprises:
controlling the processor to denoise the fingerprint image based on a maximum connected domain algorithm;
and controlling the processor to extract the feature information in the fingerprint image after denoising, matching the feature information with preset reference fingerprint information, and executing screen unlocking if matching is successful.
The invention provides an off-screen fingerprint extraction device, which is applied to a terminal, calculates a distance value between a target object and the device through a sensor arranged in the device, judges whether a user wants to unlock a screen or not according to the distance value by using a processor, further controls a camera to shoot a picture of the target object, and extracts a fingerprint image in the picture based on a skin color detection algorithm. Because this extrascreen fingerprint extraction element can directly accomplish the work of drawing of fingerprint based on the cooperation of sensor, camera and treater, consequently need not to integrate other fingerprint module in the terminal, has abandoned the way of integrating the fingerprint module in the terminal screen at present stage, has simplified the manufacture craft of terminal screen and has saved the cost. And the accuracy of the fingerprint information extracted based on the skin color detection algorithm is high, so that the accuracy of subsequent fingerprint comparison and screen unlocking is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an off-screen fingerprint extraction device according to an embodiment of the present invention.
Fig. 2 is a flowchart of an off-screen fingerprint extraction method according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an off-screen fingerprint extracting apparatus, which is applied to a terminal. The terminal is preferably a mobile phone, and the off-screen fingerprint extraction device is integrated in the mobile phone.
The device for extracting the fingerprint outside the screen comprises a sensor 10, a camera 20 and a processor 30 which is respectively electrically connected with the sensor 10 and the camera 20. It should be noted that the distance between the sensor 10 and the camera 20 is very small, and can be considered as the two are adjacent.
The sensor 10 is preferably a distance sensor, more preferably an infrared distance sensor.
The sensor 10 calculates a distance value between the target object in the external space and itself when the terminal is in the screen-off state.
The screen-off state refers to a protection operation of turning off a screen for saving power performed by the terminal after the user does not use the terminal for a certain period of time. When the terminal is in the screen-off state, the sensor 10 detects whether a target object capable of shielding the terminal (or the camera 20) exists in the external space in real time. The external space refers to an external environment where the terminal is located, and if the sensor 10 is an infrared distance sensor, it continuously emits infrared light pulses outwards, and if it can receive reflected infrared light pulses, it is determined that a target object exists in the external space.
After the sensor 10 detects the target object, the distance value between the target object and itself (or the camera 20) is calculated according to the time interval between the time when the infrared light pulse is emitted and the time when the reflected infrared light pulse is received.
After the sensor 10 calculates the distance value, the distance value is sent to the processor 30.
After receiving the distance value, the processor 30 determines whether the distance value is within a preset distance interval, if so, it indicates that the user may unlock the screen, and at this time, sends a shooting instruction to the camera 20, otherwise, does not perform any processing. It should be noted that the off-screen fingerprint extraction apparatus further includes a memory (not shown in fig. 1), and the memory is used for storing two endpoint values of the preset distance interval.
After receiving the shooting instruction, the camera 20 takes a picture of the target object and sends the picture to the processor 30.
After the processor 30 receives the photograph, a fingerprint image in the photograph is extracted based on a skin tone detection algorithm.
It should be noted that the skin color detection algorithm may be a cr component and otsu thresholding method of the Ycrcb color space, or may be a cr component and cb component range screening method of the Ycrcb color space, which may be selected according to different scenes and the computational complexity requirement of the algorithm, and this embodiment does not specifically limit this.
The specific detection process will be described by taking the cr component and cb component range screening method of the Ycrcb color space as the skin color detection algorithm used in this embodiment:
first, RGB image data of a photograph is converted into Ycrbr image data. Specifically, the RGB data of each pixel of the photo is converted into Ycrbr data by using the following formula.
Figure BDA0002577610340000041
Wherein, R is the brightness value of the red channel of any pixel point, G is the brightness value of the green channel of the pixel point, B is the brightness value of the blue channel of the pixel point, Y is the brightness component value of the pixel point, Cb is the blue chroma component value of the pixel point, and Cr is the red chroma component value of the pixel point.
Then, determining each pixel point of the cr component in the photo in the first preset interval and the cb component in the second preset interval as a target pixel point, and determining the fingerprint image in the photo according to the position of the target pixel point.
Wherein, the two end point values of the first preset interval are respectively [ a1，a2]The two end point values of the second preset interval are respectively [ b1,b2]. Preferably, a1The preferred value range is 130-150, a2The preferred value range is 160-180, b1Preferred value rangesIs 90-110, b2The preferred value range is 110-130.
The device for extracting the fingerprint outside the screen provided by the embodiment of the invention is applied to a terminal, the distance value between a target object and the device is calculated through a sensor 10 arranged in the device, a processor 30 is utilized to judge whether a user wants to unlock the screen according to the distance value, a camera 20 is further controlled to shoot a picture of the target object, and the fingerprint image in the picture is extracted based on a skin color detection algorithm. Because this extrascreen fingerprint extraction element can directly accomplish the work of drawing of fingerprint based on the cooperation of sensor 10, camera 20 and treater 30, consequently need not to integrate other fingerprint module in the terminal, has abandoned the way of integrating the fingerprint module in the terminal screen at present stage, has simplified the manufacture craft of terminal screen and has saved the cost. And the accuracy of the fingerprint information extracted based on the skin color detection algorithm is high, so that the accuracy of subsequent fingerprint comparison and screen unlocking is improved.
In some embodiments, sensor 10 is preferably a distance sensor, more preferably an infrared distance sensor, and camera 20 is a front-facing camera, more preferably a wide-angle front-facing camera.
In some embodiments, the two endpoints of the preset distance interval are 1cm and 5cm, respectively.
It can be understood that if the target object is too close to the sensor 10 (or the camera 20), the camera 20 cannot focus, and if the target object is too far away from the sensor 10 (or the camera 20), the picture taken by the camera 20 is not clear, therefore, in this embodiment, the preset distance interval is preferably 1-5cm according to the optimal shooting range of the camera 20, that is, after the processor 30 receives the distance value, it determines whether the distance value is in the range of 1-5cm, if so, it indicates that the user may want to unlock the screen, and then sends a shooting instruction to the camera 20, otherwise, no processing is performed. It should be noted that the preset distance interval may be adjusted according to the optimal shooting ranges of different cameras, which is not specifically limited in this embodiment.
In some embodiments, both the sensor 10 and the camera 20 are located in the lower right corner region of the terminal.
As most users are used to operate the mobile phone with the right hand, the sensor 10 and the camera 20 are both disposed in the lower right corner region of the terminal to match the user habits, so that the user can unlock the screen conveniently.
In some embodiments, the processor 30 is further configured to denoise the fingerprint image based on a maximum connected component algorithm.
Understandably, because a plurality of noise points are easy to appear in the fingerprint image extracted based on the skin color detection algorithm, in order to extract a purer fingerprint image, the maximum connected domain algorithm is used for reserving the fingerprint signal and rejecting other noise signals, thereby obtaining the purer fingerprint image.
In some embodiments, the processor 30 is further configured to extract feature information in the denoised fingerprint image, match the feature information with preset reference fingerprint information, and execute screen unlocking if matching is successful.
Specifically, the preset reference fingerprint information is stored in a memory (not shown in fig. 1) of the off-screen fingerprint extraction device in advance, the preset reference fingerprint information may be feature information extracted from a fingerprint image prerecorded by a user having a screen unlocking right, and it should be noted that the preset reference fingerprint information may be used for screen unlocking.
The preset reference fingerprint information may be stored as follows:
when the processor 30 receives the fingerprint setting instruction, the distance value between the user's finger and itself is calculated by the sensor 10 and sent to the processor 30.
The processor 30 determines whether the distance value is within a preset distance range according to the received distance value, and if so, sends a shooting instruction to the camera 20.
The camera 20 takes a picture of the user's finger according to the photographing instruction and transmits the picture to the processor 30.
The processor 30 extracts the fingerprint image in the photograph based on a skin tone detection algorithm.
Optionally, the processor 30 further performs denoising on the fingerprint image based on a maximum connected domain algorithm, extracts feature information in the denoised fingerprint image, and stores the feature information as preset reference fingerprint information.
The process of information comparison is as follows: the processor 30 extracts feature information in the denoised fingerprint image, matches the feature information with preset reference fingerprint information, and if the matching is successful, that is, the similarity between the feature information and the preset reference fingerprint information is very close, determines that the matching between the feature information and the preset reference fingerprint information is successful, and executes screen unlocking.
In some embodiments, the off-screen fingerprint extracting apparatus in this embodiment further includes a memory (not shown in fig. 1), which is electrically connected to the processor 30 and is configured to store two endpoint values of the preset distance interval and the preset reference fingerprint information.
It should be noted that, since the preset distance interval and the preset reference fingerprint information are already described in detail in the above embodiments, they are not described herein again.
The embodiment of the invention also provides a terminal which comprises the device for extracting the fingerprint outside the screen.
Specifically, referring to fig. 1, a sensor 10 disposed in the off-screen fingerprint extraction device calculates a distance value between a target object and the off-screen fingerprint extraction device, so that the processor 30 determines whether a user wants to unlock the screen according to the distance value, further controls the camera 20 to shoot a picture of the target object, and extracts a fingerprint image in the picture based on a skin color detection algorithm.
The terminal provided by the embodiment of the invention comprises the off-screen fingerprint extraction device, and the off-screen fingerprint extraction device can directly finish the fingerprint extraction work based on the cooperation of the sensor 10, the camera 20 and the processor 30, so that an additional fingerprint module does not need to be integrated in the terminal, the method of integrating the fingerprint module in the terminal screen at the present stage is abandoned, the manufacturing process of the terminal screen is simplified, and the cost is saved. And the accuracy of the fingerprint information extracted based on the skin color detection algorithm is high, so that the accuracy of subsequent fingerprint comparison and screen unlocking is improved.
The embodiment of the present invention further provides an off-screen fingerprint extraction method, which is applied to a terminal, where the terminal includes an off-screen fingerprint extraction device, please refer to fig. 1, and the off-screen fingerprint extraction device includes a sensor 10, a camera 20, and a processor 30 electrically connected to the sensor 10 and the camera 20, respectively. Referring to fig. 2, the method for extracting an off-screen fingerprint includes:
in step S1, the sensor 10 is controlled to calculate a distance value between the target object in the external space and itself when the terminal is in the screen-off state, and send the distance value to the processor 30.
In step S2, the control processor 30 determines whether the distance value is within a preset distance range, and sends a shooting instruction to the camera 20 when the distance value is within the preset distance range.
In step S3, the control camera 20 takes a picture of the target object upon receiving the photographing instruction, and sends the picture to the processor 30.
In step S4, the control processor 30 extracts a fingerprint image in the photograph based on a skin tone detection algorithm.
Specifically, referring to fig. 1, a sensor 10 disposed in the off-screen fingerprint extraction device calculates a distance value between a target object and the off-screen fingerprint extraction device, and a processor 30 determines whether a user wants to unlock the screen according to the distance value, so as to control a camera 20 to take a picture of the target object, and extract a fingerprint image in the picture based on a skin color detection algorithm.
The terminal provided by the embodiment of the invention comprises the off-screen fingerprint extraction device, and the off-screen fingerprint extraction device can directly finish the fingerprint extraction work based on the cooperation of the sensor 10, the camera 20 and the processor 30, so that an additional fingerprint module does not need to be integrated in the terminal, the method of integrating the fingerprint module in the terminal screen at the present stage is abandoned, the manufacturing process of the terminal screen is simplified, and the cost is saved. And the accuracy of the fingerprint information extracted based on the skin color detection algorithm is high, so that the accuracy of subsequent fingerprint comparison and screen unlocking is improved.
In some embodiments, the off-screen fingerprint extraction method further comprises:
the control processor 30 denoises the fingerprint image based on the maximum connected domain algorithm.
The control processor 30 extracts feature information in the denoised fingerprint image, matches the feature information with preset reference fingerprint information, and if matching is successful, performs screen unlocking.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An off-screen fingerprint extraction device is applied to a terminal and is characterized by comprising a sensor, a camera and a processor, wherein the processor is electrically connected with the sensor and the camera respectively; wherein the content of the first and second substances,
the sensor is used for calculating a distance value between a target object in an external space and the sensor when the terminal is in a screen-off state, and sending the distance value to the processor, the processor is used for judging whether the distance value is in a preset distance interval, and when the distance value is in the preset distance interval, the processor is also used for sending a shooting instruction to the camera;
the camera is used for shooting a picture of the target object when the shooting instruction is received, and sending the picture to the processor, and the processor is further used for extracting a fingerprint image in the picture based on a skin color detection algorithm.
2. The off-screen fingerprint extraction device of claim 1, wherein the sensor is a distance sensor and the camera is a front-facing camera.
3. The off-screen fingerprint extraction device of claim 1, wherein the two endpoint values of the preset distance interval are 1cm and 5cm, respectively.
4. The off-screen fingerprint extraction device of claim 1, wherein the sensor and the camera are both located in a lower right corner region of the terminal.
5. The off-screen fingerprint extraction device of claim 1, wherein the processor is further configured to denoise the fingerprint image based on a maximum connected component algorithm.
6. The off-screen fingerprint extraction device of claim 5, wherein the processor is further configured to extract feature information in the denoised fingerprint image, match the feature information with preset reference fingerprint information, and perform screen unlocking if matching is successful.
7. The device according to claim 6, further comprising a memory electrically connected to the processor, wherein the memory is configured to store two endpoint values of the predetermined distance interval and the predetermined reference fingerprint information.
8. A terminal characterized in that it comprises an offscreen fingerprint extraction device according to any one of claims 1 to 7.
9. The method for extracting the fingerprint outside the screen is applied to a terminal and is characterized in that the terminal comprises an extracting device for the fingerprint outside the screen, the extracting device for the fingerprint outside the screen comprises a sensor, a camera and a processor which is electrically connected with the sensor and the camera respectively, and the extracting method for the fingerprint outside the screen comprises the following steps:
controlling the sensor to calculate a distance value between a target object in an external space and the sensor when the terminal is in a screen-off state, and sending the distance value to the processor;
controlling the processor to judge whether the distance value is in a preset distance interval or not, and controlling the processor to send a shooting instruction to the camera when the distance value is in the preset distance interval;
controlling the camera to shoot a picture of the target object when receiving the shooting instruction, and sending the picture to the processor;
controlling the processor to extract a fingerprint image in the photograph based on a skin color detection algorithm.
10. The method of claim 9, further comprising:
controlling the processor to denoise the fingerprint image based on a maximum connected domain algorithm;
and controlling the processor to extract the feature information in the fingerprint image after denoising, matching the feature information with preset reference fingerprint information, and executing screen unlocking if matching is successful.
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CN107438854A (en) * 2015-02-06 2017-12-05 维里迪乌姆Ip有限责任公司 The system and method that the image captured using mobile device performs the user authentication based on fingerprint
CN107609499A (en) * 2017-09-04 2018-01-19 南京航空航天大学 Contactless palmmprint region of interest extracting method under a kind of complex environment
CN108319908A (en) * 2018-01-26 2018-07-24 华中科技大学 A kind of untethered environment method for detecting human face based on Pixel-level Differential Characteristics

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107438854A (en) * 2015-02-06 2017-12-05 维里迪乌姆Ip有限责任公司 The system and method that the image captured using mobile device performs the user authentication based on fingerprint
CN106055957A (en) * 2016-05-31 2016-10-26 广东欧珀移动通信有限公司 Fingerprint unlocking method and terminal
CN106485222A (en) * 2016-10-10 2017-03-08 上海电机学院 A kind of method for detecting human face being layered based on the colour of skin
CN107609499A (en) * 2017-09-04 2018-01-19 南京航空航天大学 Contactless palmmprint region of interest extracting method under a kind of complex environment
CN108319908A (en) * 2018-01-26 2018-07-24 华中科技大学 A kind of untethered environment method for detecting human face based on Pixel-level Differential Characteristics

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