CN107622249B - Fingerprint image acquisition method and device applied to mobile terminal - Google Patents
Fingerprint image acquisition method and device applied to mobile terminal Download PDFInfo
- Publication number
- CN107622249B CN107622249B CN201710889478.8A CN201710889478A CN107622249B CN 107622249 B CN107622249 B CN 107622249B CN 201710889478 A CN201710889478 A CN 201710889478A CN 107622249 B CN107622249 B CN 107622249B
- Authority
- CN
- China
- Prior art keywords
- ultrasonic
- pixel point
- fingerprint
- time
- pixel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The disclosure relates to a fingerprint image acquisition method and device applied to a mobile terminal. The mobile terminal comprises at least two ultrasonic transmitters and at least two ultrasonic receivers, each pixel point of the fingerprint image is provided with the corresponding ultrasonic transmitter and ultrasonic receiver, and the method comprises the following steps: the method comprises the steps that ultrasonic waves are transmitted by an ultrasonic transmitter corresponding to each pixel point and reflected ultrasonic waves are received by a corresponding ultrasonic receiver, fingerprint subdata corresponding to each pixel point is obtained, the fingerprint subdata comprises distance information from the ultrasonic reflection point to a designated horizontal line, each ultrasonic transmitter and the corresponding ultrasonic receiver correspond to a plurality of pixel points, and then a fingerprint image is obtained according to the fingerprint subdata of all the pixel points. The number of the used ultrasonic transmitters and ultrasonic receivers is smaller than the number of pixel points of the fingerprint image, so that the cost of the fingerprint image acquisition sensor can be effectively reduced, the data volume of processing can be effectively reduced, and the accuracy rate of the acquired fingerprint image can be improved.
Description
Technical Field
The present disclosure relates to the field of image processing technologies, and in particular, to a fingerprint image acquisition method and apparatus applied to a mobile terminal.
Background
With the popularization of the internet and mobile payment, personal information security becomes more and more important, and because fingerprint features have the characteristics of uniqueness and stability, fingerprint identification technology based on human body fingerprint identification is beginning to be applied to electronic equipment and protects the personal information security on the electronic equipment.
At present, a fingerprint identification technology adopted on electronic equipment is a fingerprint identification technology based on a capacitive sensor, and when the electronic equipment is used, a user needs to make a finger tightly attached to the surface of the capacitive sensor so as to enable the capacitive sensor to acquire the fingerprint of the user.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiments of the present disclosure provide a fingerprint image acquisition method and apparatus applied to a mobile terminal. The technical scheme is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided a fingerprint image acquisition method applied to a mobile terminal, where the mobile terminal includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver, the method includes:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the method provided in this embodiment is applied to a fingerprint image acquisition method of a mobile terminal, where the mobile terminal includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver, and the method includes: the method comprises the steps that ultrasonic waves are transmitted by an ultrasonic transmitter corresponding to each pixel point and reflected ultrasonic waves are received by a corresponding ultrasonic receiver, fingerprint subdata corresponding to each pixel point is obtained, the fingerprint subdata comprises distance information from the ultrasonic reflection point to a designated horizontal line, each ultrasonic transmitter and the corresponding ultrasonic receiver correspond to a plurality of pixel points, and then a fingerprint image is obtained according to the fingerprint subdata of all the pixel points. The number of the used ultrasonic transmitters and ultrasonic receivers is smaller than the number of pixel points of the fingerprint image, so that the cost of the fingerprint image acquisition sensor can be effectively reduced, the data volume of processing can be effectively reduced due to the fact that the number of the ultrasonic transmitters and the ultrasonic receivers is reduced, and the accuracy rate of the acquired fingerprint image can be improved.
In one embodiment, the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point are located at the same position under the touch panel, and the ultrasonic transmitter corresponding to each pixel point transmits ultrasonic waves and the ultrasonic receiver corresponding to each pixel point receives reflected ultrasonic waves, so as to obtain sub-data of the fingerprint corresponding to each pixel point, including:
transmitting ultrasonic waves to the pixel point position on the touch panel through an ultrasonic transmitter corresponding to each pixel point, and acquiring first time for transmitting the ultrasonic waves;
receiving the reflected ultrasonic waves by the ultrasonic receiver corresponding to each pixel point, and acquiring second time for receiving the ultrasonic waves;
and determining the distance information of the ultrasonic wave reflection point to the specified horizontal line according to the first time and the second time.
In one embodiment, the determining the distance information from the ultrasonic reflection point to the designated horizontal line according to the first time and the second time includes:
computing
The delta l is the distance from an ultrasonic reflection point corresponding to a second pixel point to a specified horizontal line, and the second pixel point is any one of the pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; the theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line; c is the speed of propagation of the ultrasonic wave in the touch panel.
In one embodiment, the step of obtaining the sub-data of the fingerprint corresponding to each pixel point by transmitting the ultrasonic wave through the ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic wave through the corresponding ultrasonic receiver comprises:
and according to the appointed scanning sequence, simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
According to a second aspect of the embodiments of the present disclosure, there is provided a fingerprint image acquiring apparatus applied to a mobile terminal, the mobile terminal including at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image having a corresponding ultrasonic transmitter and ultrasonic receiver, the apparatus including:
the fingerprint subdata acquisition module is used for transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to acquire fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from an ultrasonic reflection point to a designated horizontal line;
and the fingerprint image acquisition module is used for acquiring a fingerprint image according to the fingerprint subdata of all the pixel points acquired by the fingerprint subdata acquisition module.
In one embodiment, the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point are located at the same position under the touch panel, and the fingerprint sub-data obtaining module includes: a first time obtaining submodule, a second time obtaining submodule and a distance information determining submodule;
the first time obtaining submodule is used for transmitting ultrasonic waves to the position of each pixel point on the touch panel through the ultrasonic transmitter corresponding to each pixel point and obtaining first time for transmitting the ultrasonic waves;
the second time obtaining submodule is used for receiving the reflected ultrasonic waves through the ultrasonic receiver corresponding to each pixel point and obtaining second time for receiving the ultrasonic waves;
the distance information determining submodule is used for determining the distance information from the ultrasonic reflection point to the specified horizontal line according to the first time acquired by the first time acquiring submodule and the second time acquired by the second time acquiring submodule.
In one embodiment, the plurality of pixel points correspond to a pair of an ultrasonic transmitter and an ultrasonic receiver, and the pair of the ultrasonic transmitter and the ultrasonic receiver is perpendicular to a first pixel point of the plurality of pixel points, and the distance information determination submodule includes: a calculation submodule;
the calculation submodule is used for calculating
Wherein, the delta l is the distance from the ultrasonic reflection point corresponding to the second pixel point to the designated horizontal line, and the second pixel point isAny one of the plurality of pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; and theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line.
In one embodiment, the fingerprint sub-data obtaining module includes: a control sub-module;
and the control submodule is used for simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence according to the specified scanning sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
According to a third aspect of the embodiments of the present disclosure, there is provided a fingerprint image acquiring apparatus applied to a mobile terminal, the mobile terminal including at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image having a corresponding ultrasonic transmitter and ultrasonic receiver, the apparatus including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
According to a fourth aspect of embodiments of the present disclosure, there is provided a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the steps of:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of a fingerprint data collection device according to one exemplary embodiment.
Fig. 2 is a schematic diagram of a fingerprint data collection device according to a second exemplary embodiment.
Fig. 3 is a schematic diagram of a fingerprint data collection device according to a third exemplary embodiment.
Fig. 4 is a flowchart illustrating a fingerprint image acquisition method applied to a mobile terminal according to an exemplary embodiment.
FIG. 5 is a schematic diagram illustrating a pixel site according to an example embodiment.
Fig. 6 is a flowchart illustrating a step S101 in a flowchart of a fingerprint image acquisition method applied to a mobile terminal according to an exemplary embodiment.
Fig. 7 is a first application scenario diagram illustrating a fingerprint image acquisition method applied to a mobile terminal according to an exemplary embodiment.
Fig. 8 is a diagram illustrating an application scenario of the fingerprint image acquisition method applied to a mobile terminal according to an exemplary embodiment.
Fig. 9 is a flowchart illustrating a fingerprint image acquisition method applied to a mobile terminal according to a second exemplary embodiment.
Fig. 10 is a block diagram illustrating a fingerprint image acquisition apparatus applied to a mobile terminal according to an exemplary embodiment.
Fig. 11 is a block diagram illustrating a sub-fingerprint data acquiring module 11 applied to a fingerprint image acquiring apparatus of a mobile terminal according to an exemplary embodiment.
Fig. 12 is a block diagram illustrating a distance information determination sub-module 113 applied to a fingerprint image acquisition device of a mobile terminal according to an exemplary embodiment.
Fig. 13 is a block diagram of a sub-fingerprint data acquiring module 11 applied to a fingerprint image acquiring apparatus of a mobile terminal according to a second exemplary embodiment.
Fig. 14 is a block diagram illustrating a fingerprint image acquiring apparatus 80 applied to a mobile terminal according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Fingerprint identification technology corresponds a person to his fingerprint, and by comparing his fingerprint with a pre-stored fingerprint, his true identity can be verified. The skin texture varies from person to person (including fingerprints) across patterns, breaks and intersections, i.e., is unique and does not change throughout life. By virtue of this uniqueness and stability, we can create fingerprint identification techniques.
Thanks to modern electronic integrated manufacturing technology and fast and reliable algorithm research, fingerprint identification has begun to enter our daily life, becoming the most deeply researched, widely applied and developed technology in the current biological detection science. Fingerprint recognition algorithms ultimately resolve to finding and comparing features of a fingerprint on a fingerprint image.
At present, a fingerprint identification technology adopted on a mobile terminal is a fingerprint identification technology based on a capacitive sensor, and when the mobile terminal is used, a user is required to cling a finger to the surface of the capacitive sensor so that the capacitive sensor can acquire the fingerprint of the user and register the fingerprint to form a fingerprint template. After the fingerprint registration is successful, when the user uses the fingerprint for unlocking, the user still needs to tightly attach the finger to the surface of the capacitive sensor so that the capacitive sensor acquires the fingerprint of the user, the fingerprint identification system compares the currently acquired fingerprint with a previously registered fingerprint template for confirmation, when the comparison is successful, the fingerprint is successfully unlocked, otherwise, the fingerprint is failed to unlock.
Since the surface of the capacitive sensor is made of silicon material, and a finger touches the capacitive sensor during use, the surface of the capacitive sensor is worn, and the service life of the capacitive sensor is further reduced.
Since the capacitive sensor has a weak penetration ability and cannot penetrate through the cover glass of the display screen of the mobile terminal, a hole is usually formed at a predetermined position on the surface of the mobile terminal to accommodate the capacitive sensor. When a hole is formed on the surface of the mobile terminal, the visual aesthetic feeling of the mobile terminal is affected.
Capacitive sensor technology employs alternating commanded parallel and sensor plates in the form of two capacitive plates, with the valleys and ridges of the fingerprint being the dielectric between the plates. A sensor of a constant dielectric therebetween detects the change to generate a fingerprint image. Since the capacitance sensor technology forms a fingerprint image by irregularities between valleys and ridges of a fingerprint, it requires teaching of cleanliness of fingers, and has a low recognition rate of difficult fingers such as dirty fingers and wet fingers.
Ultrasonic waves are mechanical waves with a frequency exceeding 20000Hz, have the ability to penetrate through materials, and produce echoes of different sizes depending on the penetrated materials. The ultrasonic technique is well established and stable as a widely used technique in the industrial and medical fields. Moreover, with the improvement of the manufacturing process, the ultrasonic device can be made small enough to be integrated into various mobile terminals.
Therefore, in order to improve the accuracy of fingerprint identification, the related art uses an ultrasonic technology to identify a fingerprint, fig. 1 is a schematic diagram of a fingerprint data acquisition device according to an exemplary embodiment, and as shown in fig. 1, in order to obtain a fingerprint image with a size of N × N pixels, N × N pairs of ultrasonic transmitters and ultrasonic receivers are used on a sensor surface, each pair of ultrasonic transmitter and ultrasonic receiver only acquires a fingerprint image of a corresponding pixel, and at this time, a sensor where the ultrasonic transmitter and the ultrasonic receiver are located is placed under a touch panel of a display screen. Fig. 2 is a schematic diagram of a fingerprint data acquisition device according to an exemplary embodiment two, and fig. 3 is a schematic diagram of a fingerprint data acquisition device according to an exemplary embodiment three, where fig. 2 is a top view, and fig. 3 is a side view corresponding to fig. 2, and as shown in fig. 2 and fig. 3, the device can acquire a fingerprint image of 8 × 8 pixels, and assuming that the wave velocity of an ultrasonic wave in a touch panel is c, and the time interval between sending the ultrasonic wave and receiving the ultrasonic wave is T, the distance between the current point of a fingerprint surface and the sensor surface can be obtained as follows:
after the distance corresponding to each pair of ultrasonic transmitter and ultrasonic receiver on the surface of the sensor is obtained, a fingerprint surface height map can be obtained, and an effective fingerprint image can be obtained.
By the method, the ultrasonic transmitters and the ultrasonic receivers with the same number as the pixel points of the fingerprint image are needed to be used for acquiring the fingerprint image, the sensor is expensive due to the huge number of the ultrasonic transmitters and the ultrasonic receivers, the cost is high, the data volume processed in the sensor is large, and the acquired fingerprint image is not accurate easily.
The method provided in the present disclosure is applied to a fingerprint image acquisition method of a mobile terminal, where the mobile terminal includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver, and the method includes: the method comprises the steps that ultrasonic waves are transmitted by an ultrasonic transmitter corresponding to each pixel point and reflected ultrasonic waves are received by a corresponding ultrasonic receiver, fingerprint subdata corresponding to each pixel point is obtained, the fingerprint subdata comprises distance information from the ultrasonic reflection point to a designated horizontal line, each ultrasonic transmitter and the corresponding ultrasonic receiver correspond to a plurality of pixel points, and then a fingerprint image is obtained according to the fingerprint subdata of all the pixel points. The number of the used ultrasonic transmitters and ultrasonic receivers is smaller than the number of pixel points of the fingerprint image, so that the cost of the fingerprint image acquisition sensor can be effectively reduced, the data volume of processing can be effectively reduced due to the fact that the number of the ultrasonic transmitters and the ultrasonic receivers is reduced, and the accuracy rate of the acquired fingerprint image can be improved.
Fig. 4 is a flowchart illustrating a fingerprint image acquisition method applied to a mobile terminal according to an exemplary embodiment, where the mobile terminal applied in the method of the present embodiment includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver, and as shown in fig. 4, the method includes the following steps S101-S102:
in step S101, an ultrasonic wave is transmitted by an ultrasonic transmitter corresponding to each pixel point and a reflected ultrasonic wave is received by a corresponding ultrasonic receiver, and fingerprint sub-data corresponding to each pixel point is obtained, where the fingerprint sub-data includes distance information from an ultrasonic reflection point to a designated horizontal line, and each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points.
In step S102, a fingerprint image is obtained according to the fingerprint sub-data of all the pixel points.
For example, in the related art, if fingerprint subdata of 10 pixel points is to be collected, and each pair of ultrasonic transmitter and ultrasonic receiver corresponds to collect fingerprint subdata of one pixel point, 10 pairs of ultrasonic transmitter and ultrasonic receiver are required, but in the present disclosure, since a plurality of pixel points correspond to one pair of ultrasonic transmitter and ultrasonic receiver, the number of required ultrasonic transmitter and ultrasonic receiver is less than 10, for example, 2 pixel points correspond to 1 pair of ultrasonic transmitter and ultrasonic receiver, and then only 5 pairs of ultrasonic transmitter and ultrasonic receiver are required to collect fingerprint subdata of 10 pixel points.
The method provided in this embodiment is applied to a fingerprint image acquisition method of a mobile terminal, where the mobile terminal includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver, and the method includes: the method comprises the steps that ultrasonic waves are transmitted by an ultrasonic transmitter corresponding to each pixel point and reflected ultrasonic waves are received by a corresponding ultrasonic receiver, fingerprint subdata corresponding to each pixel point is obtained, the fingerprint subdata comprises distance information from the ultrasonic reflection point to a designated horizontal line, each ultrasonic transmitter and the corresponding ultrasonic receiver correspond to a plurality of pixel points, and then a fingerprint image is obtained according to the fingerprint subdata of all the pixel points. The number of the used ultrasonic transmitters and ultrasonic receivers is smaller than the number of pixel points of the fingerprint image, so that the cost of the fingerprint image acquisition sensor can be effectively reduced, the data volume of processing can be effectively reduced due to the fact that the number of the ultrasonic transmitters and the ultrasonic receivers is reduced, and the accuracy rate of the acquired fingerprint image can be improved.
In an implementation, different pixel points may correspond to the same ultrasonic transmitter and ultrasonic receiver, that is, each pair of pixel points corresponding to the ultrasonic transmitter and the ultrasonic receiver may have an overlapping portion. Because the fingerprint image collection region comprises the pixel, that is, there can be the overlap portion in the preset fingerprint image collection region that every ultrasonic transmitter and ultrasonic receiver correspond, as shown in fig. 5, include 3 pixel in the fingerprint image, be pixel 1 respectively, pixel 2 and pixel 3, obtain fingerprint subdata 1 of pixel 1 and fingerprint subdata 2 of pixel 2 through ultrasonic transmitter 1 and ultrasonic receiver 1, obtain fingerprint subdata 2 of pixel 2 and fingerprint subdata 3 of pixel 3 through ultrasonic transmitter 2 and ultrasonic receiver 2.
After the ultrasonic transmitter 1 and the ultrasonic receiver 1 acquire the fingerprint subdata 1 and the fingerprint subdata 2 and the ultrasonic transmitter 2 and the ultrasonic receiver 2 acquire the fingerprint subdata 2 and the fingerprint subdata 3, the fingerprint subdata 2 with high image quality in the acquired 2 fingerprint subdata 2 can be selected as the final fingerprint subdata 2 for acquiring the fingerprint image.
By the method, the selection needs to be performed on the overlapping part at the later stage, so that the complexity of fingerprint image acquisition is increased, and the time delay of fingerprint image acquisition is increased.
In another implementation, the fingerprint subdata of the pixel points acquired by the ultrasonic transmitter and the ultrasonic receiver has no overlapping part. Continuing with the above example, the fingerprint subdata 1 of the pixel point 1 and the fingerprint subdata 2 of the pixel point 2 are obtained through the ultrasonic transmitter 1 and the ultrasonic receiver 1, and the fingerprint subdata 3 of the pixel point 3 is obtained through the ultrasonic transmitter 2 and the ultrasonic receiver 2. After the fingerprint subdata 1 and the fingerprint subdata 2 are obtained through the ultrasonic transmitter 1 and the ultrasonic receiver 1 and the fingerprint subdata 3 obtained through the ultrasonic transmitter 2 and the ultrasonic receiver 2, a fingerprint image can be directly obtained according to the fingerprint subdata 1, the fingerprint subdata 2 and the fingerprint subdata 3.
It should be noted that the number of the pixel points corresponding to each ultrasonic transmitter and each ultrasonic receiver may be the same or different, and the disclosure does not limit the number of the pixel points corresponding to each ultrasonic transmitter and each ultrasonic receiver.
In one embodiment, the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point are located at the same position under the touch panel, as shown in fig. 6, the above step S101 can be implemented as the following steps S1011 to S1013:
in step S1011, an ultrasonic wave is transmitted to the position of each pixel point on the touch panel through the ultrasonic transmitter corresponding to each pixel point, and the first time for transmitting the ultrasonic wave is obtained.
In step S1012, the ultrasonic receiver corresponding to each pixel receives the reflected ultrasonic wave, and acquires a second time for receiving the ultrasonic wave.
In step S1013, distance information of the ultrasonic wave reflection point to the specified horizontal line is determined from the first time and the second time.
Referring to fig. 7, the mobile terminal includes a touch panel 201 for placing a finger thereon and an ultrasonic transmitter and an ultrasonic receiver 202, and the ultrasonic transmitter of the ultrasonic transmitter and the ultrasonic receiver 202 may transmit an ultrasonic wave to the finger 203 attached to the touch panel 201 and receive the ultrasonic wave returned by the finger 203 due to the shielding of the finger 203.
For example, the touch panel 201 may be a display screen.
The acquired fingerprint image is a fingerprint of a finger in close contact with the touch panel 201.
In order to obtain a fingerprint image, a fingerprint reference line, i.e. a designated horizontal line, needs to be determined, and then fingerprint sub-data is determined based on the designated horizontal line. During the emission of the ultrasound wave by the ultrasound wave emitter, a first time T of emission of the ultrasound wave can be recordedHair-like deviceAnd recording a second time T for receiving the ultrasonic wave reflected by the finger (namely, the ultrasonic wave reflection point) in the corresponding pixel pointIs connected with(ii) a And then according to THair-like deviceAnd TIs connected withAnd determining the distance information of the ultrasonic wave reflection point to the specified horizontal line. Finally, a fingerprint image is acquired according to the distance information.
Wherein the specified horizontal line may be preset in advance.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the number of the ultrasonic transmitters and the ultrasonic receivers is smaller than the number of the pixel points of the fingerprint images, so that the cost of the fingerprint image acquisition sensor can be effectively reduced, the number of the ultrasonic modules is reduced, the data volume of processing can be effectively reduced, and the accuracy of the acquired fingerprint images can be improved.
In an embodiment, the plurality of pixel points correspond to a pair of the ultrasonic transmitter and the ultrasonic receiver, and the pair of the ultrasonic transmitter and the ultrasonic receiver is perpendicular to a first pixel point of the plurality of pixel points, and the step S1013 may be implemented as:
according to
Determining the distance information from the ultrasonic reflection point to a specified horizontal line;
wherein, Δ l is the distance from the ultrasonic reflection point corresponding to the second pixel point to the designated horizontal line, and the second pixel point is any one of the plurality of pixel points different from the first pixel point; Δ t1A time difference between the second time and the first time corresponding to the first pixel point; Δ t2A time difference between the second time and the first time corresponding to the second pixel point; theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and the vertical line; c is the speed of propagation of the ultrasonic wave in the touch panel.
On the basis of the above fig. 7, as shown in fig. 8, if the second pixel point is the pixel point of B point and the first pixel point is the pixel point of a point, then
Wherein, Δ t2A first time T of transmitting ultrasonic waves by an ultrasonic transmitter corresponding to a pixel point of a point BB hairThe ultrasonic receiver corresponding to the pixel point of the point B receives the second time T of the ultrasonic wave reflected by the finger shelter in the pixel point of the point BB is connected toThe time difference between them; Δ t1A first time T of transmitting ultrasonic wave by the ultrasonic transmitter corresponding to the pixel point of the point AA hairThe ultrasonic receiver corresponding to the pixel point of the point A receives the second time T of the ultrasonic wave reflected by the finger shelter in the pixel point of the point AA is connected withThe time difference between them.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the number of the ultrasonic receiving and transmitting modules is smaller than the number of the pixel points of the fingerprint image, so that the cost of the fingerprint image acquisition sensor can be effectively reduced, the number of the ultrasonic modules is reduced, the data volume of processing can be effectively reduced, and the accuracy of the acquired fingerprint image can be improved.
In one embodiment, the step of obtaining the sub-data of the fingerprint corresponding to each pixel point by transmitting the ultrasonic wave through the ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic wave through the corresponding ultrasonic receiver comprises: and according to the appointed scanning sequence, simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
For example, the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point may be turned on simultaneously; the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point can be started from left to right.
Fig. 9 is a flowchart illustrating a fingerprint image obtaining method applied to a mobile terminal according to an exemplary embodiment, where the mobile terminal includes 2X4 pairs of ultrasonic transmitters and ultrasonic receivers, the number of pixel points of a fingerprint image is 4X8, and each pair of ultrasonic transmitter and ultrasonic receiver is used to collect fingerprint sub-data of 2X2 pixel points, as shown in fig. 9, the method includes the following steps S301 to S307:
taking the example of obtaining the fingerprint sub-data of a point as an example, in the following description, taking fig. 8 as an example, the pixel point a and the pixel point B are both the ultrasonic transmitter 1 and the ultrasonic receiver 1, the direction of the connection line between the pixel point a and the ultrasonic transmitter 1 or the ultrasonic receiver 1 is the vertical direction, and the horizontal line corresponding to the point a is taken as the designated horizontal line:
in step S301: the ultrasonic transmitter 1 transmits ultrasonic waves to a position corresponding to a pixel point A on the touch panel and acquires a first time T for transmitting the ultrasonic waves1(ii) a The ultrasonic receiver 1 receives the ultrasonic wave reflected by the finger corresponding to the pixel point A and then receives the ultrasonic waveThe reflected ultrasonic wave is obtained, and the second time T for receiving the reflected ultrasonic wave is obtained2。
In step S302, according to
A first distance DA is determined.
In step S303, the ultrasonic transmitter 1 transmits an ultrasonic wave to a position corresponding to the pixel point B on the touch panel, and acquires a third time T for transmitting the ultrasonic wave3(ii) a Receiving the reflected ultrasonic wave due to the reflection of the finger corresponding to the pixel point B on the ultrasonic wave through the ultrasonic receiver 1, and acquiring the fourth time T for receiving the reflected ultrasonic wave4。
In step S304, according to
The second distance DB is determined.
In step S305, according to
The distance information BC is determined.
In step S306, the sub-fingerprint data of the pixel point B corresponding to the ultrasonic transmitter 1 or the ultrasonic receiver 1 is obtained according to BC.
After the fingerprint subdata corresponding to 2X2 pixel points can be obtained by the ultrasonic transmitter 1 and the ultrasonic receiver 1, 2X4 groups of fingerprint subdata are finally obtained, and at this time, step S307 may be executed:
in step S307, a fingerprint image of a 4X8 pixel point is determined according to the acquired 2X4 sets of fingerprint sub-data.
The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods.
Fig. 10 is a block diagram illustrating a fingerprint image acquisition apparatus applied to a mobile terminal, which may be implemented as part of or all of an electronic device through software, hardware or a combination of both according to an exemplary embodiment. The mobile terminal includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of the fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver, as shown in fig. 10, the apparatus includes:
the fingerprint subdata acquisition module 11 is configured to transmit ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receive reflected ultrasonic waves through a corresponding ultrasonic receiver to acquire fingerprint subdata corresponding to each pixel point, where the fingerprint subdata includes distance information from an ultrasonic reflection point to a specified horizontal line; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points;
a fingerprint image obtaining module 12, configured to obtain a fingerprint image according to the fingerprint subdata of all the pixel points obtained by the fingerprint subdata obtaining module 11.
In an embodiment, the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point are located at the same position under the touch panel, as shown in fig. 11, the fingerprint sub-data obtaining module 11 includes: a first time obtaining submodule 111, a second time obtaining submodule 112 and a distance information determining submodule 113;
the first time obtaining sub-module 111 is configured to transmit an ultrasonic wave to the position of each pixel point on the touch panel through the ultrasonic transmitter corresponding to each pixel point, and obtain a first time for transmitting the ultrasonic wave;
the second time obtaining sub-module 112 is configured to receive the reflected ultrasonic wave through the ultrasonic receiver corresponding to each pixel point, and obtain a second time for receiving the ultrasonic wave;
the distance information determining submodule 113 is configured to determine distance information between an ultrasonic reflection point and a specified horizontal line according to the first time acquired by the first time acquiring submodule 111 and the second time acquired by the second time acquiring submodule 112.
In one embodiment, the plurality of pixel points correspond to a pair of an ultrasonic transmitter and an ultrasonic receiver, and the pair of the ultrasonic transmitter and the ultrasonic receiver is perpendicular to a first pixel point of the plurality of pixel points, as shown in fig. 12, the distance information determining sub-module 113 includes: a calculation sub-module 1131;
the calculation submodule 1131 is used for calculating
The delta l is the distance from an ultrasonic reflection point corresponding to a second pixel point to a specified horizontal line, and the second pixel point is any one of the pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; and theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line.
In one embodiment, as shown in fig. 13, the fingerprint sub-data obtaining module 11 includes: a control sub-module 114;
and the control submodule 114 is configured to simultaneously turn on the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence according to the designated scanning sequence, and the ultrasonic transmitter transmits ultrasonic waves to the corresponding pixel point positions.
According to a third aspect of the embodiments of the present disclosure, there is provided a fingerprint image acquiring apparatus applied to a mobile terminal, where the mobile terminal includes at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image has a corresponding ultrasonic transmitter and ultrasonic receiver; the device further comprises: a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
The processor may be further configured to:
the ultrasonic transmitter and the ultrasonic receiver that every pixel point corresponds are located the same position under the touch panel, and ultrasonic transmitter transmission ultrasonic wave and the ultrasonic receiver that corresponds that correspond through every pixel point receive the ultrasonic wave of reflection back, acquire the fingerprint subdata that every pixel point corresponds, include:
transmitting ultrasonic waves to the pixel point position on the touch panel through an ultrasonic transmitter corresponding to each pixel point, and acquiring first time for transmitting the ultrasonic waves;
receiving the reflected ultrasonic waves by the ultrasonic receiver corresponding to each pixel point, and acquiring second time for receiving the ultrasonic waves;
and determining the distance information of the ultrasonic wave reflection point to the specified horizontal line according to the first time and the second time.
A plurality of pixel correspond a pair of ultrasonic transmitter and ultrasonic receiver, and should be to the first pixel in a plurality of pixel of ultrasonic transmitter and ultrasonic receiver perpendicular to, confirm the distance information of ultrasonic reflection point to appointed horizon according to first time and second time, include:
computing
The delta l is the distance from an ultrasonic reflection point corresponding to a second pixel point to a specified horizontal line, and the second pixel point is any one of the pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; the theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line; c is the speed of propagation of the ultrasonic wave in the touch panel.
The ultrasonic transmitter that corresponds through every pixel point sends the ultrasonic wave and the ultrasonic receiver that corresponds receives the ultrasonic wave that reflects back, acquires the fingerprint subdata that every pixel point corresponds, includes:
and according to the appointed scanning sequence, simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 14 is a block diagram illustrating a fingerprint image acquisition apparatus 80 applied to a mobile terminal according to an exemplary embodiment, which is suitable for a terminal device. For example, the apparatus 80 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
The apparatus 80 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.
The processing component 802 generally controls overall operation of the device 80, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the apparatus 80. Examples of such data include instructions for any application or method operating on the device 80, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The power supply component 806 provides power to the various components of the device 80. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 80.
The multimedia component 808 includes a screen that provides an output interface between the device 80 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 80 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 80 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 80. For example, the sensor assembly 814 may detect the open/closed status of the device 80, the relative positioning of the components, such as a display and keypad of the device 80, the change in position of the device 80 or a component of the device 80, the presence or absence of user contact with the device 80, the orientation or acceleration/deceleration of the device 80, and the change in temperature of the device 80. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate wired or wireless communication between the apparatus 80 and other devices. The device 80 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 80 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the apparatus 80 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
A non-transitory computer readable storage medium, wherein instructions, when executed by a processor of an apparatus 80, enable the apparatus 80 to perform the above-described fingerprint image acquisition method applied to a mobile terminal, the method comprising:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
The ultrasonic transmitter and the ultrasonic receiver that every pixel point corresponds are located the same position under the touch panel, and ultrasonic transmitter transmission ultrasonic wave and the ultrasonic receiver that corresponds that correspond through every pixel point receive the ultrasonic wave of reflection back, acquire the fingerprint subdata that every pixel point corresponds, include:
transmitting ultrasonic waves to the pixel point position on the touch panel through an ultrasonic transmitter corresponding to each pixel point, and acquiring first time for transmitting the ultrasonic waves;
receiving the reflected ultrasonic waves by the ultrasonic receiver corresponding to each pixel point, and acquiring second time for receiving the ultrasonic waves;
and determining the distance information of the ultrasonic wave reflection point to the specified horizontal line according to the first time and the second time.
A plurality of pixel correspond a pair of ultrasonic transmitter and ultrasonic receiver, and should be to the first pixel in a plurality of pixel of ultrasonic transmitter and ultrasonic receiver perpendicular to, confirm the distance information of ultrasonic reflection point to appointed horizon according to first time and second time, include:
computing
The delta l is the distance from an ultrasonic reflection point corresponding to a second pixel point to a specified horizontal line, and the second pixel point is any one of the pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; the theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line; c is the speed of propagation of the ultrasonic wave in the touch panel.
The ultrasonic transmitter that corresponds through every pixel point sends the ultrasonic wave and the ultrasonic receiver that corresponds receives the ultrasonic wave that reflects back, acquires the fingerprint subdata that every pixel point corresponds, includes:
and according to the appointed scanning sequence, simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A fingerprint image acquisition method applied to a mobile terminal, wherein the mobile terminal comprises at least two ultrasonic transmitters and at least two ultrasonic receivers, and each pixel point of a fingerprint image is provided with the corresponding ultrasonic transmitter and ultrasonic receiver, and the method comprises the following steps:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line; the number of the ultrasonic transmitters and the ultrasonic receivers is less than that of the pixel points of the fingerprint image; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
2. The method of claim 1, wherein the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point are located at the same position under the touch panel, and the ultrasonic transmitter corresponding to each pixel point transmits ultrasonic waves and the ultrasonic receiver corresponding to each pixel point receives reflected ultrasonic waves to obtain the sub-data of the fingerprint corresponding to each pixel point, including:
transmitting ultrasonic waves to the pixel point position on the touch panel through an ultrasonic transmitter corresponding to each pixel point, and acquiring first time for transmitting the ultrasonic waves;
receiving the reflected ultrasonic waves by the ultrasonic receiver corresponding to each pixel point, and acquiring second time for receiving the ultrasonic waves;
and determining the distance information of the ultrasonic wave reflection point to the specified horizontal line according to the first time and the second time.
3. The method of claim 2, wherein the plurality of pixel points correspond to a pair of an ultrasonic transmitter and an ultrasonic receiver, and the pair of the ultrasonic transmitter and the ultrasonic receiver is perpendicular to a first pixel point of the plurality of pixel points, and the determining the distance information of the ultrasonic reflection point to the designated horizontal line according to the first time and the second time comprises:
computing
The delta l is the distance from an ultrasonic reflection point corresponding to a second pixel point to a specified horizontal line, and the second pixel point is any one of the pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; the theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line; the c is the speed at which the ultrasonic wave propagates in the touch panel.
4. The method of claim 3, wherein the obtaining the sub-data of the fingerprint corresponding to each pixel point by transmitting the ultrasonic wave through the ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic wave through the corresponding ultrasonic receiver comprises:
and according to the appointed scanning sequence, simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
5. The utility model provides a fingerprint image acquisition device for mobile terminal, mobile terminal includes two at least ultrasonic transmitter and two at least ultrasonic receiver, and every pixel point of fingerprint image has corresponding ultrasonic transmitter and ultrasonic receiver, its characterized in that, the device includes:
the fingerprint subdata acquisition module is used for transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to acquire fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from an ultrasonic reflection point to a designated horizontal line; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points; the number of the ultrasonic transmitters and the ultrasonic receivers is less than that of the pixel points of the fingerprint image; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points;
and the fingerprint image acquisition module is used for acquiring a fingerprint image according to the fingerprint subdata of all the pixel points acquired by the fingerprint subdata acquisition module.
6. The apparatus of claim 5, wherein the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point are located at the same position under the touch panel, and the sub-fingerprint data obtaining module comprises: a first time obtaining submodule, a second time obtaining submodule and a distance information determining submodule;
the first time obtaining submodule is used for transmitting ultrasonic waves to the position of each pixel point on the touch panel through the ultrasonic transmitter corresponding to each pixel point and obtaining first time for transmitting the ultrasonic waves;
the second time obtaining submodule is used for receiving the reflected ultrasonic waves through the ultrasonic receiver corresponding to each pixel point and obtaining second time for receiving the ultrasonic waves;
the distance information determining submodule is used for determining the distance information from the ultrasonic reflection point to the specified horizontal line according to the first time acquired by the first time acquiring submodule and the second time acquired by the second time acquiring submodule.
7. The apparatus of claim 6, wherein the plurality of pixel points correspond to a pair of an ultrasonic transmitter and an ultrasonic receiver, and the pair of the ultrasonic transmitter and the ultrasonic receiver is perpendicular to a first pixel point of the plurality of pixel points, and wherein the distance information determination submodule comprises: a calculation submodule;
the above-mentionedA calculation submodule for calculating
The delta l is the distance from an ultrasonic reflection point corresponding to a second pixel point to a specified horizontal line, and the second pixel point is any one of the pixel points different from the first pixel point; the Δ t1A time difference between a second time corresponding to the first pixel point and the first time; the Δ t2A time difference between a second time corresponding to the second pixel point and the first time; the theta is an included angle between a connecting line of the second pixel point and the corresponding ultrasonic transmitter and a vertical line; the c is the speed at which the ultrasonic wave propagates in the touch panel.
8. The apparatus of claim 7, wherein the fingerprint sub-data obtaining module comprises: a control sub-module;
and the control submodule is used for simultaneously starting the ultrasonic transmitter and the ultrasonic receiver corresponding to each pixel point in sequence according to the specified scanning sequence, and transmitting ultrasonic waves to the corresponding pixel point positions by the ultrasonic transmitter.
9. The utility model provides a fingerprint image acquisition device for mobile terminal, its characterized in that, mobile terminal includes two at least ultrasonic transmitter and two at least ultrasonic receiver, and every pixel point of fingerprint image has corresponding ultrasonic transmitter and ultrasonic receiver, the device includes:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points; the number of the ultrasonic transmitters and the ultrasonic receivers is less than that of the pixel points of the fingerprint image; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
10. A computer readable storage medium having computer instructions stored thereon which, when executed by a processor, perform the steps of:
transmitting ultrasonic waves through an ultrasonic transmitter corresponding to each pixel point and receiving the reflected ultrasonic waves through a corresponding ultrasonic receiver to obtain fingerprint subdata corresponding to each pixel point, wherein the fingerprint subdata comprises distance information from the ultrasonic reflection point to an appointed horizontal line; each ultrasonic transmitter and each ultrasonic receiver correspond to a plurality of pixel points; the number of the ultrasonic transmitters and the ultrasonic receivers is less than that of pixel points of the fingerprint image;
and acquiring a fingerprint image according to the fingerprint subdata of all the pixel points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710889478.8A CN107622249B (en) | 2017-09-27 | 2017-09-27 | Fingerprint image acquisition method and device applied to mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710889478.8A CN107622249B (en) | 2017-09-27 | 2017-09-27 | Fingerprint image acquisition method and device applied to mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107622249A CN107622249A (en) | 2018-01-23 |
| CN107622249B true CN107622249B (en) | 2021-02-19 |
Family
ID=61090993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710889478.8A Active CN107622249B (en) | 2017-09-27 | 2017-09-27 | Fingerprint image acquisition method and device applied to mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107622249B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108255397A (en) * | 2018-02-02 | 2018-07-06 | 中兴通讯股份有限公司 | Control performs method, apparatus, storage medium and electronic device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729128A (en) * | 1985-06-10 | 1988-03-01 | Grimes Marvin G | Personal identification card system |
| CN105389545A (en) * | 2015-10-23 | 2016-03-09 | 江苏久祥汽车电器集团有限公司 | Method for detecting fingerprints by utilizing ultrasonic waves, and novel biological identification robot system |
| CN105869251A (en) * | 2016-05-17 | 2016-08-17 | 珠海格力电器股份有限公司 | Switchgear equipment and authentication method thereof as well as switch system |
| CN106355165A (en) * | 2016-09-30 | 2017-01-25 | 北京小米移动软件有限公司 | Fingerprint data acquisition method and device |
-
2017
- 2017-09-27 CN CN201710889478.8A patent/CN107622249B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729128A (en) * | 1985-06-10 | 1988-03-01 | Grimes Marvin G | Personal identification card system |
| CN105389545A (en) * | 2015-10-23 | 2016-03-09 | 江苏久祥汽车电器集团有限公司 | Method for detecting fingerprints by utilizing ultrasonic waves, and novel biological identification robot system |
| CN105869251A (en) * | 2016-05-17 | 2016-08-17 | 珠海格力电器股份有限公司 | Switchgear equipment and authentication method thereof as well as switch system |
| CN106355165A (en) * | 2016-09-30 | 2017-01-25 | 北京小米移动软件有限公司 | Fingerprint data acquisition method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107622249A (en) | 2018-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10942580B2 (en) | Input circuitry, terminal, and touch response method and device | |
| CN106951884B (en) | Fingerprint acquisition method and device and electronic equipment | |
| RU2643473C2 (en) | Method and tools for fingerprinting identification | |
| EP3410346B1 (en) | Oled panel | |
| US10713640B2 (en) | Mobile terminal and control method therefor | |
| CN105468767B (en) | Card information acquisition methods and device | |
| KR20180067624A (en) | Fingerprint input presentation method and apparatus | |
| CN107195661B (en) | OLED panel | |
| CN108256853B (en) | Payment method and mobile terminal | |
| CN106557759B (en) | Signpost information acquisition method and device | |
| CN106355165B (en) | Fingerprint data acquisition method and device | |
| CN109558000B (en) | Man-machine interaction method and electronic equipment | |
| CN105069426A (en) | Similar picture determining method and apparatus | |
| CN109544445B (en) | Image processing method and device and mobile terminal | |
| US20180211097A1 (en) | Method and device for acquiring feature image, and user authentication method | |
| CN107958239B (en) | Fingerprint identification method and device | |
| CN107330391A (en) | Product information reminding method and device | |
| CN104933700A (en) | Method and apparatus for image content recognition | |
| CN109284591B (en) | Face unlocking method and device | |
| CN108122020A (en) | Two-dimensional code generation method and device and two-dimensional code identification method and device | |
| CN106886019A (en) | Distance measurement method and device | |
| CN107622249B (en) | Fingerprint image acquisition method and device applied to mobile terminal | |
| CN113343195A (en) | Electronic equipment and fingerprint unlocking method and fingerprint unlocking device thereof | |
| CN107688765B (en) | Fingerprint acquisition method and device | |
| CN111444491B (en) | Information processing method and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |