CN113128252A - Fingerprint identification method and related device - Google Patents
Fingerprint identification method and related device Download PDFInfo
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- CN113128252A CN113128252A CN201911387999.9A CN201911387999A CN113128252A CN 113128252 A CN113128252 A CN 113128252A CN 201911387999 A CN201911387999 A CN 201911387999A CN 113128252 A CN113128252 A CN 113128252A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005284 excitation Effects 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims abstract description 18
- 238000010168 coupling process Methods 0.000 claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 7
- 230000015654 memory Effects 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 21
- 239000000741 silica gel Substances 0.000 description 21
- 229910002027 silica gel Inorganic materials 0.000 description 21
- 239000004020 conductor Substances 0.000 description 13
- 239000012528 membrane Substances 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000615 nonconductor Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 210000004369 blood Anatomy 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000001124 body fluid Anatomy 0.000 description 2
- 239000010839 body fluid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 210000003491 skin Anatomy 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000004207 dermis Anatomy 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention provides a fingerprint identification method, which comprises the following steps: determining that a covering object exists on the fingerprint identification device, providing the same excitation signals for two electrode groups positioned on the side edge of the fingerprint identification device, and acquiring the size of a coupling capacitor formed by the covering object and a conductive substance in the fingerprint identification device to acquire a first capacitance value; providing different excitation signals for the two groups of electrodes, and acquiring the size of the coupling capacitor to obtain a second capacitance value; and comparing the first capacitance value with the second capacitance value, and determining whether the covering is a real finger according to a comparison result, so that the accuracy of fingerprint identification of the electronic equipment is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a fingerprint identification method and a related apparatus.
Background
Fingerprint identification technology has begun to enter into various fields in the life, and these two years have more explosive growth in the intelligent lock market, and traditional fingerprint lock uses optical sensor, is a camera gather fingerprint image and compares, because it is the camera and take a picture, so the photo of fingerprint when, ordinary non-conductive silica gel family finger can both be cracked, then semiconductor fingerprint module appears.
Disclosure of Invention
The embodiment of the invention provides a fingerprint identification method and a related device, aiming at reducing the false rejection rate of fingerprint identification and improving the accuracy of fingerprint identification of electronic equipment.
In order to achieve the above object, the present invention provides a fingerprint identification method, including: determining that a covering object exists on the fingerprint identification module, providing the same excitation signals for two electrode groups positioned on the side edge of the fingerprint identification module, and acquiring the size of a coupling capacitor formed by the covering object and a conductive substance in the fingerprint identification module so as to acquire a first capacitance value; providing different excitation signals for the two groups of electrodes, and acquiring the size of the coupling capacitor to obtain a second capacitance value; and comparing the first capacitance value with the second capacitance value, and determining whether the covering is a real finger according to a comparison result, so that the problem of accuracy of fingerprint identification of the electronic equipment is solved.
Preferably, the providing of the different excitation signals to the two electrode groups respectively comprises: one of the electrode sets is supplied with a ground signal and the other electrode set is supplied with a square wave signal.
Preferably, the comparing the first and second capacitance values and determining whether the cover is a real finger according to the comparison result comprises: calculating a ratio of the first capacitance value and the second capacitance value; and judging the ratio and a first threshold, and if the ratio is smaller than the first threshold, determining that the finger is a real finger.
Preferably, the comparing the first and second capacitance values and determining whether the cover is a real finger according to the comparison result comprises: calculating a difference between the first and second capacitance values; and comparing the difference value with the second threshold value, and if the difference value is smaller than the second threshold value, determining that the finger is a true finger.
Preferably, the same excitation signal is provided, the excitation signal being a square wave signal.
Preferably, after the first capacitance value and the second capacitance value are compared and whether the covering is a real finger is determined according to the comparison result, if the covering is a fake finger, reminding information is output to a terminal.
Preferably, two electrode groups include a plurality of electrode respectively, two electrode groups on the fingerprint identification module are located the both sides of fingerprint module respectively.
Preferably, the system comprises a signal generation module and a fingerprint identification module; the fingerprint identification module comprises: the first acquisition unit is used for controlling the signal generator to provide the same excitation signals for the two electrode groups positioned on the side edges of the fingerprint identification module when the covering object is determined to exist on the fingerprint identification module, and acquiring the size of a coupling capacitor formed by the covering object and a conductive substance in the fingerprint identification module so as to obtain a first capacitance value; the second acquisition unit is used for controlling the signal generation module to provide different excitation signals for the two groups of electrodes and acquiring the size of the coupling capacitor so as to obtain a second capacitance value; and the processing unit is used for comparing the first capacitance value with the second capacitance value and determining whether the covering is a real finger or not according to the comparison result.
Preferably, a signal manager, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor are included, the programs including instructions for the steps in any of the fingerprint recognition methods.
Preferably, a computer program for electronic data exchange is stored, wherein the computer program causes a computer to perform any one of the fingerprint recognition methods.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a fingerprint identification method of the present invention;
FIG. 2 is a flow chart of an embodiment of the present invention for identifying a conductive silicone dummy finger;
FIG. 3 is a block diagram of one embodiment of the present invention;
FIG. 4 is a graph of capacitance distribution when detecting a finger according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating capacitance distribution when a finger is fake according to an embodiment of the present invention;
FIG. 6 is a graph of step excitation waveforms for an electrode of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, it is to be understood that the specific embodiments described herein are only for the purpose of explaining the present invention, and are not to be used as limitations of the present invention.
Fingerprint identification technology has begun to enter into various fields in the life, and these two years have more explosive growth in the intelligent lock market, and traditional fingerprint lock uses optical sensor, is a camera gather fingerprint image and compares, because it is the camera and take a picture, so the photo of fingerprint when, ordinary non-conductive silica gel family finger can both be cracked, then semiconductor fingerprint module appears.
The existing semiconductor fingerprint module detects the coupling capacitance from the conductor of the finger to the fingerprint, and can not be cracked by a picture of a non-conductor or a non-conductive silica gel fingerprint film.
As shown in fig. 1, the present invention provides a fingerprint identification method, which includes the following steps:
s1: determining the existence of a cover on the fingerprint identification device, providing the same excitation signal for two electrode groups positioned at the side of the fingerprint identification device, and acquiring the size of a coupling capacitor formed by the cover and a conductive substance in the fingerprint identification device so as to acquire a first capacitance value.
S2: and providing different excitation signals for the two groups of electrodes, and acquiring the size of the coupling capacitor to obtain a second capacitance value.
S3: and comparing the first capacitance value with the second capacitance value, and determining whether the covering is a real finger according to a comparison result, so that the problem of accuracy of fingerprint identification of the electronic equipment is solved.
Specifically, the invention relates to a fingerprint identification method, wherein the existing semiconductor fingerprint module can identify a conductor or a non-conductor and only unlocks the conductor, and the test shows that the surface of a human finger is not a simple conductor, the resistance of the horny layer outside the skin is very large and basically non-conductive, the conductor detected by the false fingerprint of the fingerprint module is actually in the corium layer inside the fingerprint, human tissues in the corium layer are conductive due to the relationship of body fluid and blood, and the horny layer is not conductive, so that when the fingerprint module is pressed, a coupling capacitor is formed between the conductor on the surface of the fingerprint module and the corium layer, and the capacitance is about 2-8 nf after the test.
In one embodiment, providing different excitation signals to the two electrode sets respectively comprises: one of the electrode sets is supplied with a ground signal and the other electrode set is supplied with a square wave signal.
Specifically, the providing different excitation signals to the two electrode groups respectively includes: the surface of the fingerprint inverted film fake finger formed by the conductive silica gel has conductivity, when the conductive silica gel inverted film fake finger is pressed on the surface of the fingerprint module, because the conductive silica gel inverted film fake finger is a conductor, the capacitance formed by the conductive silica gel inverted film fake finger and a conductive object on the surface of the fingerprint module is very small and is only about 50-500 pf, and the conductive silica gel fake finger or the real finger can be judged by detecting capacitance values at two ends of the finger.
In one embodiment, the comparing the first and second capacitance values and determining whether the overlay is a real finger according to the comparison comprises: calculating a ratio of the first capacitance value and the second capacitance value; and judging the ratio and a first threshold, and if the ratio is smaller than the first threshold, determining that the finger is a real finger.
Specifically, the comparing the first capacitance value and the second capacitance value, and determining whether the cover is a real finger according to the comparison result, the first method includes: calculating a ratio of the first capacitance value and the second capacitance value; judging the ratio and a first threshold, if the ratio is smaller than the first threshold, the finger is true, and if the ratio is larger than the first threshold, the finger is false, because if the finger is true, the detected capacitance is 2-8 nf, which is similar to the first capacitance detection result; if the conductive silica gel reverse membrane artificial finger is used, the conductive silica gel reverse membrane artificial finger is conductive, and the grounded electrode can leak part of the current of the excitation electrode, so that the capacitance detected by the excitation electrode is very small and is far smaller than the capacitance value detected in the first step, about 50-500 pf, and the real finger or the conductive silica gel reverse membrane artificial finger can be judged according to the ratio of the capacitance values detected twice.
In one embodiment, the comparing the first and second capacitance values and determining whether the overlay is a real finger according to the comparison comprises: calculating a difference between the first and second capacitance values; and comparing the difference value with the second threshold value, and if the difference value is smaller than the second threshold value, determining that the finger is a true finger.
Specifically, the comparing the first capacitance value and the second capacitance value, and determining whether the cover is a real finger according to the comparison result includes: calculating a difference between the first and second capacitance values; comparing the difference value with the second threshold value, and if the difference value is smaller than the second threshold value, determining that the finger is a true finger, because if the finger is a true finger, the detected capacitance is 2-8 nf, and the detection result is similar to the detection result of the first capacitance value; if the conductive silica gel reverse membrane fake finger is used, the conductive silica gel reverse membrane fake finger is conductive, and the grounded electrode can leak part of the current of the exciting electrode, so that the capacitance detected by the exciting electrode is very small and is far smaller than the capacitance value detected in the first step, about 50-500 pf, and the real finger or the conductive silica gel reverse membrane fake finger can be judged through the difference value of the capacitance values detected twice.
In an embodiment, the same excitation signal is provided, the excitation signal being a square wave signal.
Specifically, the same excitation signals are provided, and the excitation signals are square wave signals, and the signals are not only square wave signals, but also sine wave signals, triangular wave signals, or the like, which do not generate the same waveforms of the capacitors when the same excitation signals are generated.
In an embodiment, after comparing the first capacitance value with the second capacitance value and determining whether the covering is a real finger according to the comparison result, if the covering is a fake finger, a prompt message is output to the terminal.
Specifically, the first capacitance value and the second capacitance value are compared, whether the covering is a real finger is determined according to a comparison result, if the covering is a fake finger, reminding information is output to the terminal, the terminal can be any electronic device and a mobile terminal, the reminding information is not limited in mode, and the reminding information can be voice warning, short message warning or terminal self-set.
In an embodiment, the two electrode sets respectively include a plurality of electrodes, and two electrode sets on the fingerprint identification module are located the both sides of fingerprint module respectively.
Specifically, two electrode groups that fingerprint identification module side was equipped with, two electrode groups include a plurality of electrode respectively, and the electrode group does not inject the number, can be one or more, two electrode groups on the fingerprint identification module are located the both sides of fingerprint module respectively, the position of two electrode groups on the fingerprint identification module is not injectd in both sides, also can be with one side or in the top or the below of fingerprint module, can produce electric capacity with the covering, have the conductivity can.
Specifically, when we press the fingerprint module, the conductive object on the surface of the fingerprint module and the dermis form a coupling capacitor, and the conductive object may be an iron ring or other conductive metal material.
In one embodiment, the device comprises a signal generation module and a fingerprint identification module; the fingerprint identification module comprises: the first acquisition unit is used for controlling the signal generator to provide the same excitation signals for the two electrode groups positioned on the side edges of the fingerprint identification module when the covering object is determined to exist on the fingerprint identification module, and acquiring the size of a coupling capacitor formed by the covering object and a conductive substance in the fingerprint identification module so as to obtain a first capacitance value; the second acquisition unit is used for controlling the signal generation module to provide different excitation signals for the two groups of electrodes and acquiring the size of the coupling capacitor so as to obtain a second capacitance value; and the processing unit is used for comparing the first capacitance value with the second capacitance value and determining whether the covering is a real finger or not according to the comparison result.
Specifically, the first obtaining unit can identify whether the existing semiconductor fingerprint module is a conductor or a non-conductor and only unlock the conductor, and the test shows that the surface of the human finger is not a simple conductor, the resistance of the horny layer outside the skin is very large and basically non-conductive, the conductor detected by the fake fingerprint of the fingerprint module is actually in the corium layer inside the fingerprint, the human tissue in the corium layer is conductive due to the relationship between body fluid and blood, and the horny layer is non-conductive, when the fingerprint module is pressed, the conductor on the surface of the fingerprint module and the corium layer form a coupling capacitor, the electrodes are subjected to capacitance detection by the same phase excitation signal, at the moment, the detected capacitance is the human capacitance, and the capacitance detected by the finger or the conductive silicone inverted film fake finger is the human capacitance, the capacitance is between about 2-8 nf.
The second obtaining unit, which provides different excitation signals to the two electrode groups respectively, includes: the method is characterized in that a grounding signal is provided for one electrode group, a square wave signal is provided for the other electrode group to excite, the surface of the fingerprint reverse-film fake finger formed by the conductive silica gel has conductivity, and when the fingerprint module is pressed by the conductive silica gel reverse-film fake finger, because the conductive silica gel reverse-film fake finger is a conductor, the capacitance formed by the conductive silica gel reverse-film fake finger and a conductive object on the surface of the fingerprint module is very small, and is only about 50-500 pf, which is far smaller than the capacitance value detected in the first step.
The processing unit can judge whether the finger is a conductive silica gel film-falling fake finger or a conductive silica gel film-falling fake finger according to the ratio of capacitance values detected twice, so that the fingerprint lock can be prevented from being cracked by the conductive silica gel film-falling fake fingerprint, and the safety is improved.
In an embodiment, an electronic device includes a signal manager, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing steps in a fingerprinting method.
The present product further comprises a computer-readable storage medium storing a computer program for electronic data exchange, the computer program causing a computer to perform some or all of the steps of any of the methods as recited in the above method embodiments, the computer comprising an electronic device.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods as described in the above method embodiments, the computer program product may be a software installation package, and the computer comprises an electronic device.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
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.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a memory, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above-mentioned method of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes. Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A fingerprint identification method, comprising:
determining that a covering object exists on the fingerprint identification device, providing the same excitation signal for two electrode groups on the fingerprint identification device, and acquiring the size of a coupling capacitor formed by the covering object and a conductive substance in the fingerprint identification device to acquire a first capacitance value;
providing different excitation signals for the two groups of electrodes, and acquiring the size of the coupling capacitor to obtain a second capacitance value;
and comparing the first capacitance value with the second capacitance value, and determining whether the covering is a real finger according to the comparison result.
2. A fingerprint identification method as claimed in claim 1 wherein said providing different excitation signals to said two electrode sets respectively comprises: one of the electrode sets is supplied with a ground signal and the other electrode set is supplied with a square wave signal.
3. The fingerprint identification method of claim 1, wherein comparing the first capacitance value and the second capacitance value and determining whether the overlay is a real finger based on the comparison comprises:
calculating a ratio of the first capacitance value and the second capacitance value;
and judging the ratio and a first threshold, and if the ratio is smaller than the first threshold, determining that the finger is a real finger.
4. The fingerprint identification method of claim 1, wherein comparing the first capacitance value and the second capacitance value and determining whether the overlay is a real finger based on the comparison comprises:
calculating a difference between the first and second capacitance values;
and comparing the difference value with the second threshold value, and if the difference value is smaller than the second threshold value, determining that the finger is a true finger.
5. A method of fingerprint identification as claimed in claim 1 wherein the same said excitation signal is provided, said excitation signal being a square wave signal.
6. The fingerprint identification method according to claim 1, wherein the first capacitance value and the second capacitance value are compared, and after determining whether the covering is a real finger according to the comparison result, if the covering is a fake finger, a prompt message is output to the terminal.
7. The fingerprint identification method of claim 1, wherein the two electrode sets respectively comprise a plurality of electrodes, and the two electrode sets on the fingerprint identification module are respectively located at two sides of the fingerprint module.
8. The fingerprint identification device is characterized by comprising a signal generation module and a fingerprint identification module;
the fingerprint identification module comprises:
the first acquisition unit is used for controlling the signal generator to provide the same excitation signals for the two electrode groups positioned on the side edges of the fingerprint identification module when the covering object is determined to exist on the fingerprint identification module, and acquiring the size of a coupling capacitor formed by the covering object and a conductive substance in the fingerprint identification module so as to obtain a first capacitance value;
the second acquisition unit is used for controlling the signal generation module to provide different excitation signals for the two groups of electrodes and acquiring the size of the coupling capacitor so as to obtain a second capacitance value;
and the processing unit is used for comparing the first capacitance value with the second capacitance value and determining whether the covering is a real finger or not according to the comparison result.
9. An electronic device comprising a signal manager, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps in a method of fingerprinting as in any of claims 1-7.
10. A computer-readable storage medium, in which a computer program for electronic data exchange is stored, wherein the computer program causes a computer to perform a fingerprint identification method according to any one of claims 1 to 7.
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| CN101950360A (en) * | 2010-09-07 | 2011-01-19 | 成都方程式电子有限公司 | Optical fingerprint identifier capable of identifying living body finger |
| CN102496014A (en) * | 2011-12-06 | 2012-06-13 | 长春方圆光电技术有限责任公司 | Optical fingerprint acquisition system for living body finger identification |
| US20180114049A1 (en) * | 2016-10-21 | 2018-04-26 | Novatek Microelectronics Corp. | Fingerprint sensor device and operation method thereof |
| CN109074485A (en) * | 2016-05-06 | 2018-12-21 | 维普公司 | Claim the electrical verifying of finger |
| KR20190087339A (en) * | 2018-01-16 | 2019-07-24 | 주식회사 다모아텍 | Apparatus and method for recognizing fake finger, apparatus for sensing fingerprint |
| CN110235144A (en) * | 2019-04-29 | 2019-09-13 | 深圳市汇顶科技股份有限公司 | Method and electronic equipment for fingerprint recognition |
-
2019
- 2019-12-30 CN CN201911387999.9A patent/CN113128252A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950360A (en) * | 2010-09-07 | 2011-01-19 | 成都方程式电子有限公司 | Optical fingerprint identifier capable of identifying living body finger |
| CN102496014A (en) * | 2011-12-06 | 2012-06-13 | 长春方圆光电技术有限责任公司 | Optical fingerprint acquisition system for living body finger identification |
| CN109074485A (en) * | 2016-05-06 | 2018-12-21 | 维普公司 | Claim the electrical verifying of finger |
| US20180114049A1 (en) * | 2016-10-21 | 2018-04-26 | Novatek Microelectronics Corp. | Fingerprint sensor device and operation method thereof |
| KR20190087339A (en) * | 2018-01-16 | 2019-07-24 | 주식회사 다모아텍 | Apparatus and method for recognizing fake finger, apparatus for sensing fingerprint |
| CN110235144A (en) * | 2019-04-29 | 2019-09-13 | 深圳市汇顶科技股份有限公司 | Method and electronic equipment for fingerprint recognition |
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