CN110457988B - Method for rapidly extracting fingerprint by using camera focus locking of intelligent display terminal - Google Patents
Method for rapidly extracting fingerprint by using camera focus locking of intelligent display terminal Download PDFInfo
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- CN110457988B CN110457988B CN201910515631.XA CN201910515631A CN110457988B CN 110457988 B CN110457988 B CN 110457988B CN 201910515631 A CN201910515631 A CN 201910515631A CN 110457988 B CN110457988 B CN 110457988B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003321 amplification Effects 0.000 claims abstract description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 18
- 239000000571 coke Substances 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000004080 punching 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
- G06V40/1318—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
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
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Abstract
The invention discloses a method for quickly extracting fingerprints by using camera focus locking of an intelligent display terminal, which comprises the following steps: s1, presetting a fingerprint image amplification ratio and a fingerprint image shooting focal length; s2, locking the coke; limiting the distance between the finger tip and a camera of the intelligent display terminal through a focusing component so as to enable the distance to be equal to the shooting focal length; s3, judging a fingerprint image; s4, judging the definition of the fingerprint image; s5, previewing, snapshotting and processing the fingerprint image; s6, confirming the fingerprint picture; and S7, fingerprint picture application. The effect is as follows: the method can greatly save focusing time and focusing time in the shooting process when the fingerprint is shot, collected and extracted, so that the fingerprint shooting, collecting and extracting speed is high, the efficiency is high, and the operation is time-saving and labor-saving.
Description
Technical Field
The invention relates to the technical field of human body feature extraction, in particular to a method for quickly extracting fingerprints by using camera focus of an intelligent display terminal.
Background
In the networking era today, in various places, various intelligent devices are almost used for fingerprint login, fingerprint payment and fingerprint identity authentication, and corresponding fingerprint identity authentication comprises fingerprint unlocking, fingerprint card punching, fingerprint identity identification and the like.
As is known, before fingerprint login, fingerprint payment and fingerprint authentication are performed by using a fingerprint, the fingerprint must be collected and extracted in advance to register for filing, and therefore, the collection and extraction of the fingerprint is a prerequisite for subsequent fingerprint login, fingerprint payment and fingerprint authentication.
However, as the prior art, there are two main ways for fingerprint collection and extraction: one is contact fingerprint extraction, and the other is close-range shooting extraction.
For the contact fingerprint extraction technology, the defects exist that: the contact type fingerprint extraction has the problems of fingerprint deformation, influence of finger humidity, trace leaving, template providing for lawless persons to copy fingerprints, requirement of special hardware for extracting the fingerprints, incapability of extracting complete fingerprints at one time and the like.
For the short-distance shooting extraction technology, the method has the advantages that: the fingerprint sensor is not influenced by external environment, does not leave traces, provides a template for lawless persons to copy fingerprints, and can extract complete fingerprints at one time.
Therefore, for the collection and extraction of fingerprints, the technology of extracting fingerprints by close-range shooting is relatively contact type, the technology is widely used, but in the process of extracting fingerprints at a close range, a proper distance needs to be kept between a finger tip and a camera of an intelligent display terminal, and the shooting system of the intelligent display terminal needs to automatically focus to ensure that the finger fingerprints displayed on a display screen are cleaned and visible, and when the display area of the finger fingerprint area on the display screen of the intelligent display terminal is less than half of the area of the display screen, the shooting system of the intelligent display terminal defaults that a non-finger fingerprint area (a finger fingerprint peripheral background) on the display screen of the intelligent display terminal is automatically focused as a main body, so that the finger fingerprint area appears vague on the display screen of the intelligent display terminal, so that the finger fingerprint area is difficult to be clearly collected, at this time, the finger fingerprint area needs to be manually selected as a focusing point on the display screen of the intelligent display terminal to make the displayed finger clearly visible so as to facilitate subsequent collection, for the corresponding operation, the speed of collecting the finger is slow, the operation is troublesome, the operation is time-consuming, the technology of extracting the technology and the technology is relatively contact type fingerprint extracting technology, and the technology of the technology relatively contact type fingerprint can keep the technology of the camera head clearly focused when the camera is slightly focused, so that the distance between the finger and the camera is slightly focused, the distance of the camera is slightly focused, and the camera can be easily kept, and the distance of the camera can be slightly focused, and the distance can be easily focused, and the distance of the distance can be easily focused when the distance of the camera is slightly focused.
Thus, the prior art needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for quickly extracting fingerprints by using the camera of an intelligent display terminal to lock focus.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows: a method for quickly extracting fingerprints by using camera focus of an intelligent display terminal comprises the following steps:
s1, presetting a fingerprint image amplification ratio and a fingerprint image shooting focal length;
presetting a fingerprint image amplification ratio and a fingerprint image shooting focal length through a shooting system built in the intelligent display terminal; the amplification ratio is such that the fingerprint in the fingerprint image required to be shot can be displayed on the display screen interface of the intelligent display terminal in a full screen mode as much as possible (the size of the fingerprint image at least occupies more than two thirds of the display screen interface of the intelligent display terminal); the shooting focal length is set to ensure that the fingerprint in the fingerprint image meeting the requirement of shooting is clearly visible;
s2, locking coke;
limiting the distance between the finger tip and a camera of the intelligent display terminal through a focusing component so that the distance is equal to the shooting focal length;
s3, judging a fingerprint image;
judging that a fingerprint image is displayed on a display screen interface of the intelligent display terminal through a shooting system built in the intelligent display terminal;
s4, judging the definition of the fingerprint image;
s41, when the shooting system arranged in the intelligent display terminal judges that the display screen interface of the intelligent display terminal displays the fingerprint image, the shooting system arranged in the intelligent display terminal automatically amplifies the fingerprint image to be shot according to the preset fingerprint image amplification proportion, so that the fingerprint in the amplified fingerprint image is almost displayed on the full screen of the display screen interface of the intelligent display terminal;
s42, when the fingerprint in the fingerprint image to be shot is almost displayed on a full screen on a display screen interface of the intelligent display terminal, automatically and quickly capturing a clear fingerprint image through a shooting system built in the intelligent display terminal;
s5, previewing, snapshotting and processing the fingerprint image;
s51, when the definition of the captured fingerprint image reaches a preset value, automatically previewing and finishing the snapshot of the fingerprint image through a shooting system arranged in the intelligent display terminal;
and S52, processing the captured fingerprint image through a shooting system arranged in the intelligent display terminal to obtain fingerprint texture information in the captured fingerprint image, and intercepting a fingerprint image containing the fingerprint texture information.
The above technical solution is further described as follows:
preferably, step S6 is further included after step S5;
s6, confirming the fingerprint picture;
and comparing the intercepted fingerprint picture with a fingerprint reference picture with a preset fingerprint definition standard, and determining the fingerprint picture reaching the preset definition standard as a qualified fingerprint picture.
Preferably, step S7 is further included after step S6;
s7, fingerprint picture application;
and transmitting the qualified fingerprint picture to a cloud server and/or an APP (application) of the fingerprint picture in the intelligent display terminal for backup.
Preferably, in step S7, the fingerprint picture application includes fingerprint login, fingerprint payment and fingerprint identity authentication.
Preferably, the focus locking member is detachably mounted on the intelligent display terminal.
Preferably, the focus locking member comprises a fixed seat detachably mounted on the intelligent display terminal, a telescopic focal length adjusting piece arranged on the fixed seat, and a finger tip abutting part arranged on the telescopic focal length adjusting piece; the position of the finger tip abutting part is opposite to the position of a camera of the intelligent display terminal, and a fixed focus opening which is over against the camera of the intelligent display terminal and used for exposing fingerprints so as to facilitate shooting of the camera of the intelligent display terminal is formed in the surface of the finger tip abutting part;
when through telescopic focus adjusting part is adjusted the finger end butt put the portion with during the interval between intelligent display terminal's the camera, the focus that fingerprint was shot to intelligent display terminal's camera is adjustable.
Preferably, the fixing seat is a hollow seat body which is fixedly sleeved outside the intelligent display terminal or fixedly sleeved outside a camera of the intelligent display terminal, and a shooting opening which is opposite to the camera of the intelligent display terminal is formed in the surface of the hollow seat body.
Preferably, the telescopic focal length adjusting part comprises a fixed sleeve connected with the shooting port and a telescopic sleeve arranged on the fixed sleeve;
the end of the telescopic sleeve is closed, the finger end abutting part is arranged at the position, close to the end, of the inner part of the telescopic sleeve, and the finger insertion hole opposite to the finger end abutting part is formed in the position, close to the end, of the outer wall of the telescopic sleeve.
Preferably, the intelligent display terminal is a smart phone or a tablet computer.
The invention has the beneficial effects that:
when the method is implemented specifically, a fingerprint image amplification ratio and a fingerprint image shooting focal length are preset in advance through a shooting system arranged in an intelligent display terminal, so that the amplification ratio is such that the requirement that the fingerprint in the fingerprint image to be shot can be displayed on the full screen of a display screen interface of the intelligent display terminal as much as possible (the size of the fingerprint image at least occupies more than two thirds of the display screen interface of the intelligent display terminal); and the shooting focal distance is set to enable the fingerprint in the fingerprint image meeting the requirement of shooting to be clearly visible; when shooting and collecting fingerprints, limiting the distance between the finger tip and the camera of the intelligent display terminal through a focus locking component in advance to enable the distance to be equal to the shooting focal length, therefore, the finger tip is placed on the focus locking component to enable the finger fingerprints to be over against the camera of the intelligent display terminal, when the camera of the intelligent display terminal captures fingerprint images, a shooting system arranged in the intelligent display terminal can automatically amplify the fingerprint images to be shot according to a preset fingerprint image amplification proportion, so that the fingerprints in the amplified fingerprint images are almost fully displayed on a display screen interface of the intelligent display terminal, when the fingerprints in the fingerprint images to be shot are almost fully displayed on the display screen interface of the intelligent display terminal, the shooting system arranged in the intelligent display terminal automatically and quickly captures clear fingerprint images, and therefore, when the definition of the captured fingerprint image reaches a preset value, the captured fingerprint image can be automatically previewed and captured and processed by a shooting system arranged in the intelligent display terminal, and the corresponding fingerprint shooting, collecting and extracting method mainly comprises the steps of focusing in advance and locking the focal length, and focusing by taking the fingerprint area amplified on the display screen of the intelligent display terminal as a main corner, so that the finger can be effectively prevented from shaking, the focusing time and the focusing time in the shooting process can be greatly saved, the fingerprint shooting, collecting and extracting speed is high, the efficiency is high, the operation is time-saving and labor-saving, the trouble of cutting the non-fingerprint area (finger fingerprint peripheral background) on the display screen of the intelligent display terminal can be effectively avoided when the fingerprint image is processed and intercepted, and the interference and influence of the non-fingerprint area (finger fingerprint peripheral background) on the fingerprint collection on the display screen of the intelligent display terminal can be effectively avoided, furthermore, the invention has strong practicability and good implementation effect.
Drawings
FIG. 1 is a flowchart illustrating the steps of a method for rapidly extracting a fingerprint by focusing a camera of an intelligent display terminal according to the present invention;
FIG. 2 is a flowchart of step S4 of FIG. 1;
FIG. 3 is a flowchart of step S5 in FIG. 1;
FIG. 4 is a schematic diagram illustrating a display screen of an intelligent display terminal displaying captured fingerprint images in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of the overall structure of the coke locking member according to an embodiment of the present invention;
FIG. 6 is a state diagram of the locking member being fixed outside the intelligent display terminal in the state of use in FIG. 5;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Reference numbers:
intelligent display terminal 10001000;
a focus lock member 2000;
a fixed seat 10;
a shooting port 101;
a telescopic focus adjuster 20;
a fixed sleeve 201; a telescopic sleeve 202; a finger insertion port 2021; the bolt 203 is locked.
A finger tip abutting part 30;
a focus fixing port 301.
Detailed Description
The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments so that the inventive spirit of the present invention can be more clearly and intuitively understood.
As shown in fig. 1, 2, 3, 4, 5 and 6;
the invention provides a method for quickly extracting fingerprints by using camera focus locking of an intelligent display terminal 1000, which comprises the following steps:
s1, presetting a fingerprint image amplification ratio and a fingerprint image shooting focal length;
the fingerprint image amplification proportion and the fingerprint image shooting focal length are preset through a shooting system built in the intelligent display terminal 1000; the amplification ratio is such that the fingerprint in the fingerprint image required to be shot can be displayed on the display screen interface of the intelligent display terminal 1000 in a full screen mode as much as possible (the size of the fingerprint image at least occupies more than two thirds of the display screen interface of the intelligent display terminal 1000); the shooting focal length is set to ensure that the fingerprint in the fingerprint image meeting the requirement of shooting is clearly visible;
s2, locking coke;
defining a distance between the finger tip and the camera of the intelligent display terminal 1000 by a focus locking member 2000 so that the distance is equal to the shooting focal distance;
s3, judging a fingerprint image;
judging whether the fingerprint image is clear and visible through a shooting system built in the intelligent display terminal 1000; (ii) a
S4, fingerprint shooting;
s41, placing a finger tip on the focus locking component 2000 to enable a finger fingerprint to be over against a camera of the intelligent display terminal 1000, when the camera of the intelligent display terminal 1000 captures a fingerprint image, automatically amplifying the fingerprint image to be shot by a shooting system built in the intelligent display terminal 1000 according to a preset fingerprint image amplification ratio, and enabling a display area to occupy at least two thirds of a display screen interface of the corresponding intelligent display terminal 1000 when a fingerprint in the amplified fingerprint image is displayed on the display screen interface of the intelligent display terminal 1000;
s42, when the display area of the fingerprint in the fingerprint image to be shot on the display screen interface of the intelligent display terminal 1000 at least occupies two thirds of the display screen interface of the corresponding intelligent display terminal 1000, automatically and quickly capturing a clear fingerprint image through a shooting system built in the intelligent display terminal 1000;
s43, when the definition of the captured fingerprint image reaches a preset value, automatically finishing the shooting of the fingerprint image through a shooting system arranged in the intelligent display terminal 1000;
s5, processing the fingerprint image;
the shot fingerprint image is processed through a shooting system built in the intelligent display terminal 1000 to acquire fingerprint texture information in the shot fingerprint image, and a fingerprint picture containing the fingerprint texture information is intercepted.
Based on the above, it is clear that: the method for quickly extracting the fingerprint by using the camera lock focus of the intelligent display terminal 1000, provided by the invention, is implemented in a concrete way, the amplification ratio of the fingerprint image and the shooting focal length of the fingerprint image are preset by a shooting system arranged in the intelligent display terminal 1000 in advance, so that the amplification ratio is such that the fingerprint in the fingerprint image required to be shot can be displayed on the display screen interface of the intelligent display terminal 1000 in a full screen manner as much as possible (the size of the fingerprint image at least occupies more than two thirds of the display screen interface of the intelligent display terminal 1000); and the shooting focal distance is set to enable the fingerprint in the fingerprint image meeting the requirement of shooting to be clearly visible; and when shooting and collecting fingerprints, the distance between the finger tip and the camera of the intelligent display terminal 1000 is limited in advance by a focus locking member 2000, so that the distance is equal to the shooting focal length.
From this, put the finger end in lock burnt component 2000 is last, make the finger fingerprint just to intelligent display terminal 1000's camera, when intelligent display terminal 1000's camera caught the fingerprint image, the fingerprint image that required shooting was enlargied according to the fingerprint image proportion of predetermineeing that intelligent display terminal 1000 built-in shooting system can be automatic promptly, make the fingerprint in the fingerprint image after the enlargeing almost full screen display in intelligent display terminal 1000's display screen interface show, when the fingerprint in the fingerprint image of required shooting was almost full screen display in intelligent display terminal 1000's display screen interface, automatic and quick fingerprint image of catching through the built-in shooting system of intelligent display terminal 1000.
Therefore, when the definition of the captured fingerprint image reaches a preset value, the capture system built in the intelligent display terminal 1000 can automatically preview and complete the capture and processing of the fingerprint image.
The corresponding fingerprint shooting, collecting and extracting method mainly focuses by taking the fingerprint area amplified on the display screen of the intelligent display terminal 1000 as a main corner for focusing in advance and locking the focal length, so that finger shaking can be effectively avoided, focusing time and focusing time in the shooting process can be greatly saved, the fingerprint shooting, collecting and extracting speed and efficiency are high, time and labor are saved in operation, and the trouble of cutting a non-fingerprint area (finger fingerprint peripheral background) on the display screen of the intelligent display terminal 1000 can be effectively avoided when fingerprint pictures are processed and intercepted, so that the interference and influence of the non-fingerprint area (finger fingerprint peripheral background) on the display screen of the intelligent display terminal 1000 on fingerprint collection can be effectively avoided.
Furthermore, the invention has strong practicability and good implementation effect.
In specific implementation, step S6 is further included after step S5;
s6, confirming the fingerprint picture;
and comparing the intercepted fingerprint picture with a fingerprint reference picture with preset fingerprint definition standard, and determining the fingerprint picture reaching the preset definition standard as a qualified fingerprint picture.
Step S7 is also included after step S6;
s7, fingerprint picture application;
the qualified fingerprint picture is transmitted to the cloud server and/or the APP of the fingerprint picture required to be used in the intelligent display terminal 1000 for backup.
Therefore, the invention can completely shoot, collect and extract the fingerprint.
It is emphasized that, in the implementation, in step S7, the fingerprint picture application mainly includes fingerprint login, fingerprint payment and fingerprint identity authentication.
In a preferred embodiment, the focus locking member 2000 is detachably mounted on the smart display terminal 1000.
Preferably, in this embodiment, the focus locking member 2000 includes a fixing base 10 detachably mounted on the intelligent display terminal 1000, a telescopic focal length adjusting element 20 disposed on the fixing base 10, and a finger tip abutting portion 30 disposed on the telescopic focal length adjusting element 20; the position of the finger tip abutting part 30 is opposite to the position of the camera of the intelligent display terminal 1000, and the surface of the finger tip abutting part 30 is provided with a fixed focus opening 301 which is opposite to the camera of the intelligent display terminal 1000 and used for exposing a fingerprint so as to facilitate shooting by the camera of the intelligent display terminal 1000;
therefore, when the distance between the finger tip abutting part 30 and the camera of the intelligent display terminal 1000 is adjusted through the telescopic focal length adjusting part 20, the adjustment of the focal length of the fingerprint shot by the camera of the intelligent display terminal 1000 can be realized.
Therefore, for the intelligent display terminal 1000 with different focal lengths of the cameras, the distance between the finger tip abutting part 30 and the camera of the intelligent display terminal 1000 can be adaptively adjusted according to the focal length parameters, so that the use adaptability of the intelligent display terminal is stronger.
Furthermore, in a preferred embodiment, the fixing base 10 is a hollow base body that is fixedly sleeved outside the intelligent display terminal 1000 or fixedly sleeved outside the camera of the intelligent display terminal 1000, and the surface of the hollow base body is provided with a shooting opening 101 that faces the camera of the intelligent display terminal 1000.
Based on this, in this embodiment, the telescopic focal length adjustment member 20 includes a fixed sleeve 201 connected to the shooting port 101 and a telescopic sleeve 202 disposed on the fixed sleeve 201;
the end of the telescopic sleeve 202 is closed, the finger end abutting part 30 which is integrally formed with the telescopic sleeve 202 is arranged in the telescopic sleeve 202 close to the end of the telescopic sleeve, and a finger inserting hole 2021 which is opposite to the finger end abutting part 30 is formed in the outer wall of the telescopic sleeve 202 close to the end of the telescopic sleeve.
Preferably, the fixed sleeve 201 is in threaded connection with the shooting port 101, and a locking bolt 203 for locking the telescopic sleeve 202 is arranged on the outer wall of the fixed sleeve 201; when the locking bolt 203 is loosened, the front and rear positions of the telescopic sleeve 202 in the fixing sleeve 201 are adjustable, so that the distance between the finger tip abutting part 30 and the camera of the intelligent display terminal 1000 is adjustable.
So, through setting up the fixing base 10 and the telescopic focus adjusting part 20 of structure make can effectively reduce the influence that ambient light etc. shot to the fingerprint.
Moreover, it should be added that, in a specific implementation, the smart display terminal 1000 is preferably a smart phone or a tablet computer.
So, when the operation, will fixing base 10 through fixing pieces such as viscose overlap in outside intelligent display terminal 1000 or with it through fixing pieces such as viscose admittedly outside intelligent display terminal 1000's the camera, the collection of finger fingerprint of can being convenient for is drawed. So that the use is convenient.
Other embodiments, etc., will not be illustrated herein.
In summary, the present invention is easy to implement, easy to operate, strong in practicability, strong in specificity, and indeed, when capturing, collecting and extracting a fingerprint, it is possible to greatly save the focusing time and focusing time during the capturing process, so that the capturing, collecting and extracting speed of the fingerprint is fast and the efficiency is high, and the operation is time-saving and labor-saving, and when processing and intercepting a fingerprint picture, it is possible to effectively eliminate the trouble of cutting a non-fingerprint area (a background around a finger fingerprint) on the display screen of the intelligent display terminal 1000, so as to effectively avoid the interference and influence of the non-fingerprint area (the background around the finger fingerprint) on the display screen of the intelligent display terminal 1000 on the fingerprint collection.
Therefore, the method for quickly extracting the fingerprint by using the camera lock focus of the intelligent display terminal 1000 provided by the invention has very good market popularization value, and the method is very popular and can be effectively popularized.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all changes in equivalent structures and equivalent processes, which are made by using the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method for quickly extracting fingerprints by using camera focus locking of an intelligent display terminal is characterized by comprising the following steps:
s1, presetting a fingerprint image amplification ratio and a fingerprint image shooting focal length;
presetting a fingerprint image amplification ratio and a fingerprint image shooting focal length through a shooting system built in the intelligent display terminal; the amplification ratio is such that the fingerprint in the fingerprint image required to be shot can be displayed on the display screen interface of the intelligent display terminal in a full screen mode as much as possible (the size of the fingerprint image at least occupies more than two thirds of the display screen interface of the intelligent display terminal); the shooting focal length is used for enabling fingerprints in the fingerprint images meeting the requirement to be shot to be clearly visible;
s2, locking the coke;
limiting the distance between the finger tip and a camera of the intelligent display terminal through a focusing component so that the distance is equal to the shooting focal length;
s3, judging a fingerprint image;
judging that a fingerprint image is displayed on a display screen interface of the intelligent display terminal through a shooting system built in the intelligent display terminal;
s4, judging the definition of the fingerprint image;
s41, when the shooting system arranged in the intelligent display terminal judges that the display screen interface of the intelligent display terminal displays the fingerprint image, the shooting system arranged in the intelligent display terminal automatically amplifies the fingerprint image to be shot according to the preset fingerprint image amplification proportion, so that the fingerprint in the amplified fingerprint image is almost displayed on the full screen of the display screen interface of the intelligent display terminal;
s42, when the fingerprint in the fingerprint image to be shot is almost displayed on a full screen on a display screen interface of the intelligent display terminal, automatically and quickly capturing a clear fingerprint image through a shooting system built in the intelligent display terminal;
s5, previewing, snapshotting and processing the fingerprint image;
s51, when the definition of the captured fingerprint image reaches a preset value, automatically previewing and finishing the snapshot of the fingerprint image through a shooting system arranged in the intelligent display terminal;
and S52, processing the captured fingerprint image through a shooting system arranged in the intelligent display terminal to obtain fingerprint texture information in the captured fingerprint image, and intercepting a fingerprint image containing the fingerprint texture information.
2. The method for rapidly extracting the fingerprint by using the camera lock focus of the intelligent display terminal according to the claim 1, characterized in that: step S6 is also included after step S5;
s6, confirming the fingerprint picture;
and comparing the intercepted fingerprint picture with a fingerprint reference picture with preset fingerprint definition standard, and determining the fingerprint picture reaching the preset definition standard as a qualified fingerprint picture.
3. The method for rapidly extracting fingerprints by focusing the camera of the intelligent display terminal according to claim 2, wherein the method comprises the following steps: step S7 is also included after step S6;
s7, fingerprint picture application;
and transmitting the qualified fingerprint picture to a cloud server and/or an APP (application) of the fingerprint picture in the intelligent display terminal for backup.
4. The method for rapidly extracting the fingerprint by using the camera lock focus of the intelligent display terminal according to the claim 3, characterized in that: in step S7, the fingerprint picture application includes fingerprint login, fingerprint payment, and fingerprint identity authentication.
5. The method for rapidly extracting the fingerprint by using the camera lock focus of the intelligent display terminal according to the claim 1, characterized in that: the lock burnt component is for detachable installation in intelligent display terminal.
6. The method for rapidly extracting the fingerprint by using the camera lock focus of the intelligent display terminal according to the claim 5, characterized in that: the focus locking component comprises a fixed seat which is detachably arranged on the intelligent display terminal, a telescopic focal length adjusting piece which is arranged on the fixed seat and a finger end abutting part which is arranged on the telescopic focal length adjusting piece; the position of the finger tip abutting part is opposite to the position of a camera of the intelligent display terminal, and a fixed focus opening which is opposite to the camera of the intelligent display terminal and used for exposing a fingerprint so as to facilitate shooting of the camera of the intelligent display terminal is formed in the surface of the finger tip abutting part;
when through telescopic focus adjusting part is adjusted the finger end butt put the portion with during the interval between intelligent display terminal's the camera, the focus that fingerprint was shot to intelligent display terminal's camera is adjustable.
7. The method for rapidly extracting fingerprints by using the camera lock focus of the intelligent display terminal as claimed in claim 6, wherein the method comprises the following steps: the fixing seat is a hollow seat body fixedly sleeved outside the intelligent display terminal or fixedly sleeved outside a camera of the intelligent display terminal, and a shooting opening which is opposite to the camera of the intelligent display terminal is formed in the surface of the hollow seat body.
8. The method for rapidly extracting fingerprints by using the camera lock focus of the intelligent display terminal as claimed in claim 7, wherein the method comprises the following steps: the telescopic focal length adjusting piece comprises a fixed sleeve connected with the shooting port and a telescopic sleeve arranged on the fixed sleeve;
the end of the telescopic sleeve is closed, the finger end abutting part is arranged at the position, close to the end, inside the telescopic sleeve, and the finger inserting hole opposite to the finger end abutting part is formed in the outer wall of the telescopic sleeve, close to the end, of the telescopic sleeve.
9. The method for rapidly extracting the fingerprint by using the camera lock focus of the intelligent display terminal according to any one of claims 1 to 8, wherein: the intelligent display terminal is an intelligent mobile phone or a tablet computer.
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