CN111222376A - Terminal, fingerprint imaging method and device thereof, and computer-readable storage medium - Google Patents
Terminal, fingerprint imaging method and device thereof, and computer-readable storage medium Download PDFInfo
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- 230000003321 amplification Effects 0.000 claims abstract description 48
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 description 9
- 230000005236 sound signal Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 229920001621 AMOLED Polymers 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
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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
- G06V40/1335—Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement
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Abstract
A terminal, a fingerprint imaging method and device thereof, and a computer readable storage medium are provided. The terminal comprises a fingerprint imaging system; the fingerprint imaging system includes: the ultrasonic sensor comprises a plurality of point sound source groups arranged in an array mode and ultrasonic sensors arranged in the array mode, wherein each point sound source group comprises at least one point sound source; the method comprises the following steps: determining a magnification factor of the fingerprint imaging system; when a fingerprint detection instruction is received, controlling each point sound source group to perform fingerprint detection according to a preset sequence; and based on the amplification factor of the fingerprint imaging system, splicing the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group, and taking the spliced fingerprint image as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired. By applying the scheme, the resolution of the fingerprint image obtained by using the ultrasonic fingerprint detection method can be improved.
Description
Technical Field
The invention relates to the technical field of fingerprint imaging, in particular to a terminal, a fingerprint imaging method and device thereof, and a computer readable storage medium.
Background
With the development of information technology, biometric identification technology plays an increasingly important role in guaranteeing information security. Among them, fingerprint identification, that is, identification of fingerprint images, has become one of the key technical means for unlocking devices widely used in the field of mobile internet.
Ultrasonic fingerprint detection is an emerging fingerprint imaging method. The point sound source can emit sound signals, the sound signals act with valleys and ridges of the fingerprint, different echo signals are reflected at the valleys and ridges of the fingerprint respectively, and the reflected echo signals are received by the ultrasonic sensor. By analyzing the reflected echo signals, a corresponding fingerprint image may be obtained.
At present, when an ultrasonic fingerprint detection method is used for fingerprint imaging, the obtained fingerprint image has partial loss, so that the resolution of the fingerprint image is low.
Disclosure of Invention
The invention aims to solve the problems that: how to improve the resolution of the obtained fingerprint image when the ultrasonic fingerprint detection method is used for fingerprint imaging.
In order to solve the above problem, an embodiment of the present invention provides a fingerprint imaging method for a terminal, where the terminal includes a fingerprint imaging system; the fingerprint imaging system includes: the ultrasonic sensor comprises a plurality of point sound source groups arranged in an array mode and a plurality of ultrasonic sensors arranged in an array mode, wherein each point sound source group comprises at least one point sound source; the method comprises the following steps: determining a magnification factor of the fingerprint imaging system; when a fingerprint detection instruction is received, controlling each point sound source group to perform fingerprint detection according to a preset sequence; and based on the amplification factor of the fingerprint imaging system, splicing the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group, and taking the spliced fingerprint image as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired.
Optionally, the splicing the fingerprint image acquired by the previous point sound source group and the fingerprint image detected by the current point sound source group based on the amplification factor of the fingerprint imaging system includes: performing position offset on a fingerprint image acquired by the previous point sound source group based on an amplification factor of the fingerprint imaging system to obtain a fingerprint image corresponding to the previous point sound source group in the current coordinate system; the current coordinate system is a coordinate system where the fingerprint image detected by the current point sound source group is located; and splicing the fingerprint image detected by the current point sound source group with the fingerprint image corresponding to the previous point sound source group under the current coordinate system to obtain the fingerprint image acquired by the current point sound source group.
Optionally, the performing, based on an amplification factor of the fingerprint imaging system, a position offset on a fingerprint image acquired by a previous point sound source group to obtain a fingerprint image corresponding to the previous point sound source group in a current coordinate system includes: determining the position coordinates of the bright points where the point sound sources in the previous point sound source group are located in the current coordinate system based on the amplification factor of the fingerprint imaging system; based on the fingerprint image acquired by the previous point sound source group and the relative distance between the corresponding bright points of each point sound source in the previous point sound source group, the fingerprint image acquired by the previous point sound source group is shifted to the current coordinate system according to the amplification factor of the fingerprint imaging system, and the fingerprint image corresponding to the previous point sound source group in the current coordinate system is acquired.
Optionally, the fingerprint imaging system further comprises: the light-transmitting cover plate is positioned on the display panel below the light-transmitting cover plate; the point sound source group is positioned below the display panel; the determining a magnification factor of the fingerprint imaging system comprises: determining the sum of the thickness values of the light-transmitting cover plate and the display panel; determining a first distance value between a plane where the ultrasonic sensor is located and a plane where the point sound source group is located; and determining the amplification factor of the fingerprint imaging system based on the sum of the thickness values of the light-transmitting cover plate and the display panel and the first distance value.
Optionally, the determining a magnification factor of the fingerprint imaging system based on the sum of the thickness values of the light-transmitting cover plate and the display panel and the first distance value includes: and summing the ratio of the first distance value to the sum of the thickness values of the light-transmitting cover plate and the display panel with a numerical value 2 to obtain a summation result which is used as an amplification factor of the fingerprint imaging system.
Alternatively, the minimum value of the distance between adjacent point sound sources when the detected fingerprint images are not in contact with and overlap is used as the distance between the point sound sources.
The embodiment of the invention also provides a fingerprint imaging device of the terminal, wherein the terminal comprises a fingerprint imaging system; the fingerprint imaging system includes: the ultrasonic sensor comprises a plurality of point sound source groups arranged in an array mode and a plurality of ultrasonic sensors arranged in an array mode, wherein each point sound source group comprises at least one point sound source; the device comprises: a determination unit adapted to determine a magnification factor of the fingerprint imaging system; the control unit is suitable for controlling the point sound source groups to carry out fingerprint detection according to a preset sequence when a fingerprint detection instruction is received; and the fingerprint imaging unit is suitable for splicing the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group based on the amplification factor of the fingerprint imaging system, and the spliced fingerprint image is used as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired.
Optionally, the fingerprint imaging unit comprises: the position offset subunit is suitable for performing position offset on a fingerprint image acquired by the previous point sound source group based on an amplification factor of the fingerprint imaging system to obtain a fingerprint image corresponding to the previous point sound source group in the current coordinate system; the current coordinate system is a coordinate system where the fingerprint image detected by the current point sound source group is located; and the splicing subunit is suitable for splicing the fingerprint image detected by the point sound source group currently with the fingerprint image corresponding to the point sound source group which is one previous to the current coordinate system, and the spliced fingerprint image is used as the fingerprint image acquired by the point sound source group currently.
Optionally, the position offset subunit is adapted to determine, in the current coordinate system, position coordinates of bright spots where respective point sound sources in the previous point sound source group are located, based on an amplification factor of the fingerprint imaging system; and shifting the fingerprint image acquired by the previous point sound source group to the current coordinate system according to the amplification factor of the fingerprint imaging system based on the relative distance between the fingerprint image acquired by the previous point sound source group and the bright point corresponding to each point sound source in the previous point sound source group to obtain the fingerprint image corresponding to the previous point sound source group in the current coordinate system.
Optionally, the fingerprint imaging system further comprises: the light-transmitting cover plate is positioned on the display panel below the light-transmitting cover plate; the point sound source group is positioned below the display panel; the determination unit includes: a first determining subunit, adapted to determine a sum of the thickness values of the light-transmissive cover plate and the display panel; a second determining subunit, adapted to determine a first distance value between a plane in which the ultrasonic sensor is located and a plane in which the point sound source group is located; and the calculating subunit is suitable for determining the amplification factor of the fingerprint imaging system based on the sum of the thickness values of the light-transmitting cover plate and the display panel and the first distance value.
Optionally, the calculating subunit is adapted to sum a ratio of the first distance value to a sum of the thickness values of the transparent cover plate and the display panel and a numerical value 2 to obtain a sum result as an amplification factor of the fingerprint imaging system.
Optionally, the distance between the point sound sources is: and the minimum distance between adjacent point sound sources when the detected fingerprint images are not in contact with or overlapped.
The embodiment of the invention also provides a terminal, which comprises the fingerprint imaging device of any one of the terminals.
Embodiments of the present invention further provide a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method of any one of the above-mentioned steps is performed.
The embodiment of the present invention further provides a terminal, which includes a memory and a processor, where the memory stores computer instructions capable of running on the processor, and the processor executes any of the steps of the method when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
by applying the scheme of the invention, when a fingerprint detection instruction is received, each point sound source group is controlled to perform fingerprint detection according to a preset sequence, and further, a fingerprint image acquired by the previous point sound source group and a fingerprint image detected by the current point sound source group can be spliced based on an amplification factor of the fingerprint imaging system, and the spliced fingerprint image is used as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired, so that the acquisition of each point sound source group is mutually complemented, the seamless scanning of full fingerprints is realized, the loss of the fingerprint images is avoided, and the resolution of the fingerprint images is improved.
Drawings
Fig. 1 is a flowchart of a fingerprint imaging method of a terminal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the distribution of a point sound source according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fingerprint imaging system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fingerprint imaging apparatus of a terminal according to an embodiment of the present invention.
Detailed Description
At present, when an ultrasonic fingerprint detection method is used for fingerprint imaging, although a plurality of point sound sources illuminate a fingerprint at the same time, seamless scanning cannot be carried out on the full fingerprint in single imaging, so that partial loss exists in an obtained fingerprint image, and finally the resolution ratio of the fingerprint is low.
Aiming at the problem, the invention provides a fingerprint imaging method of a terminal, when determining a fingerprint image acquired by a current point sound source group, based on an amplification factor of a fingerprint imaging system, a fingerprint image acquired by a previous point sound source group is spliced with a fingerprint image detected by the current point sound source group, and the spliced fingerprint image is used as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired, so that the acquisition of each point sound source group is mutually complemented, the seamless scanning of full fingerprints is realized, the fingerprint image loss is avoided, and the resolution of the fingerprints is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a fingerprint imaging method for a terminal. First, in order to facilitate implementation of the present invention, the terminal in the embodiment of the present invention may include a fingerprint imaging system. The fingerprint imaging system may include: a plurality of some sound source group and a plurality of fingerprint sensor that are the array mode and arrange that are the array mode of arranging that are arranged, every point sound source group includes at least one point sound source.
In a specific implementation, the point source may emit an acoustic signal and the acoustic signal reacts with valleys and ridges of a finger to reflect a corresponding echo signal. The ultrasonic sensor may receive the reflected echo signal within a preset range. The point sound source may be formed by an ultrasonic sensor, or may be formed by other electronic devices that can emit sound signals, and is not limited specifically.
In an implementation, the number of the point sound source groups may be set according to the size and the area of the fingerprint image detected by each point sound source group. Preferably, after all the point sound source groups perform fingerprint detection, a fingerprint image obtained by the last point sound source group performing fingerprint detection is a full fingerprint image.
In addition, a person skilled in the art can set the number of the point sound sources in each point sound source group and the number of the ultrasonic sensors in each point sound source according to actual imaging requirements, which is not limited specifically. The number of point sound sources in each point sound source group can be the same or different. The number of ultrasonic sensors in each point source may be the same or different.
In a specific implementation, the lighting area lighted by each point sound source is a point sound source area. There is a certain interval between adjacent point sound source regions, whereby a plurality of discrete point sound source regions can be formed. The plurality of discrete point sound source areas may illuminate a plurality of areas on the terminal screen.
In a specific implementation, there may be multiple arrangements between the point sound source groups, and there may also be multiple arrangements of the point sound sources in each point sound source group. Wherein, the arrangement mode may include: uniformly arranged, parallel arranged or annularly arranged. Preferably, the point sound source groups may be arranged uniformly, that is, distances between adjacent point sound source groups are equal, so that the size of the image detected by each point light source is the same, which is convenient for subsequent image processing.
The parallel arrangement is a structure in which rows are parallel to each other to form a plurality of parallel rows, and columns are parallel to each other to form a plurality of parallel columns. For example, referring to fig. 2, the white point is a point sound source, and each line of point sound sources is a point sound source group. All the point sound sources are arranged in parallel, and the horizontal rows and the vertical rows are perpendicular to each other. Of course, in some embodiments, the rows may be angled relative to the columns, such as by 60 degrees.
The ring arrangement is that one point sound source is arranged at the center of the screen of the terminal, and other point sound sources are arranged on a circle with the center as the center and the radius increasing in sequence.
In a specific implementation, the point sound source region may have various shapes, for example, the point sound source region may have a shape like a circle, a rectangle, a diamond, a triangle, a straight line, a parallel line, a dashed line, a parallel dashed line, or the like. Preferably, the point sound source region has a circular-like shape. The shape of each point sound source area can be set according to imaging requirements.
In a specific implementation, the spacing between point sound sources may be adjusted according to the imaging quality. In order to avoid the overlapping between the imaging, the distance between two adjacent point sound sources can ensure that the respectively detected fingerprint images are not contacted and overlapped. Preferably, the distance between the point sound sources may be a minimum value when the respective detected fingerprint images are not in contact and are not overlapped. Of course, the influence of other hardware parameters of the fingerprint imaging system can also be considered in the specific setting process.
Referring to fig. 3, a layer surface on which the plurality of ultrasonic sensors arranged in an array are located is referred to as a sensor layer 31. In addition to the sensor layer 31, the fingerprint imaging system may further include: the sensor comprises a light-transmitting cover plate 32 and a display panel 33 positioned below the light-transmitting cover plate 32, wherein a sensor layer 31 is positioned below the display panel 33. The group of point sound sources may be located in the same plane as the ultrasonic sensors, i.e. both on the sensor layer 31. The point sound source group may be located on a different plane from the ultrasonic sensor, and in this case, the sensor layer 31 is located below the plane on which the point sound source group is located.
In a specific implementation, the light-transmissive cover plate 32 may be a single-layer plate structure or a multi-layer structure. When the transparent cover plate 32 is a single-layer structure, the transparent cover plate 32 may be a glass cover plate or a cover plate made of an organic transparent material, or the single-layer cover plate may be a cover plate with other functions, such as a touch screen. When the transparent cover plate 32 has a multilayer structure, the transparent cover plate 32 may be a multilayer glass cover plate or a multilayer organic transparent cover plate, or may be a combination of a glass cover plate and an organic transparent cover plate.
In a specific implementation, the display panel 33 is used for displaying images. The display panel 33 may include a Liquid Crystal Display (LCD), an Active Matrix Organic Light Emitting Diode (AMOLED) display, or a micro-LED display, which are scanned in a Thin Film Transistor (TFT) structure and can drive a single ultrasonic sensor.
In an embodiment of the present invention, the fingerprint imaging method of the terminal may include the steps of:
and step 11, determining the amplification factor of the fingerprint imaging system.
In a specific implementation, taking the point sound source group and the ultrasonic sensor as an example, referring to fig. 3, when the finger 34 presses the point a on the transparent cover 32, the acoustic signal emitted by the point sound source O' passes through the gap of the display panel 33, and the corresponding echo signal is reflected at the point a, so as to be imaged to the point B on the sensor layer 31. Here, the incident angle of the acoustic signal emitted from the point sound source O' is θ, and the position passing through the display panel 33 is the point O.
For any fingerprint imaging point B, when the fingerprint point a corresponding to the transparent cover plate 32 is to be restored, the fingerprint imaging point B needs to be retracted toward the point O according to a certain proportional relationship with the point O as the center, so that the horizontal distance | | | OB | | | from the point B to the point O and the horizontal distance | | OA | | | | from the point a to the point O satisfy the proportional relationship: i OB | ═ k | | | OA | |. The k is the amplification factor of the fingerprint imaging system.
In an embodiment of the present invention, when determining the amplification factor k of the fingerprint imaging system, a sum of thickness values of the transparent cover plate and the display panel may be determined, a first distance value between a plane where the point sound source group is located and a plane where the ultrasonic sensor is located may be determined, and finally, the amplification factor of the fingerprint imaging system may be determined based on the sum of thickness values of the transparent cover plate and the display panel and the first distance value. Of course, the first distance value may be determined first, and then the sum of the thicknesses of the light-transmitting cover plate and the display panel may be determined, or the sum of the thicknesses of the light-transmitting cover plate and the display panel and the first distance value may be determined at the same time.
Let a first distance value between a plane where the point sound source group is located and a plane where the ultrasonic sensor is located (i.e., the sensor layer 31) be H, a sum of thickness values of the transparent cover plate 32 and the display panel 33 be H, and sum a ratio between the first distance value H and the thickness value H of the transparent cover plate 32 and a value 2 to obtain a summation result as an amplification factor of the fingerprint imaging system, which is specifically shown in formula (1):
when the point sound source group and the ultrasonic sensor are located on the same plane, h is 0, and k is 2. When the point sound source group and the ultrasonic sensor are positioned on different planes, h is greater than 0, and k is greater than 2.
And step 12, when a fingerprint detection instruction is received, controlling each point sound source group to perform fingerprint detection according to a preset sequence.
In an embodiment of the present invention, a plurality of pressure-sensitive sensors may be installed below the screen of the electronic device in advance, and the specific number of the pressure sensors is not limited and can be set by a person skilled in the art according to actual needs. When a finger presses the screen of the terminal, the pressure-sensitive sensor is triggered to output a corresponding signal, and the signal output by the pressure-sensitive sensor can be used as a fingerprint detection instruction.
When receiving a fingerprint detection instruction, the point sound source groups can be controlled to perform fingerprint detection according to a preset sequence. The preset sequence may have multiple setting modes, for example, each of the point sound source groups may be controlled to sequentially perform fingerprint detection, and a preset time interval between adjacent point sound source groups performing fingerprint detection may also be controlled, or a preset number of point sound source groups may be spaced. It will be appreciated that whatever order is used for fingerprint detection, the full fingerprint may be scanned seamlessly.
After the previous sound source group stops fingerprint detection, the current sound source group can start fingerprint detection. In other words, only one point source group performs fingerprint detection at the same time.
And step 13, splicing the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group based on the amplification factor of the fingerprint imaging system, and taking the spliced fingerprint image as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired.
In a specific implementation, each point sound source group can detect a corresponding fingerprint image, but the detected fingerprint image is not necessarily the image finally acquired by the point sound source group. Specifically, when the point sound source group is the first point sound source group, the fingerprint image detected by the point sound source group may be directly used as the fingerprint image acquired by the point sound source group. When the point sound source group is a second and later point sound source group, the fingerprint image acquired by the previous point sound source group and the fingerprint image detected by the current point sound source group can be spliced, and the spliced fingerprint image is used as the fingerprint image acquired by the current point sound source group.
In an embodiment of the present invention, based on the amplification factor of the fingerprint imaging system, the stitching the fingerprint image acquired by the previous point sound source group and the fingerprint image detected by the current point sound source group may include:
performing position offset on a fingerprint image acquired by the previous point sound source group based on an amplification factor of the fingerprint imaging system to obtain a fingerprint image corresponding to the previous point sound source group in the current coordinate system;
and splicing the fingerprint image detected by the current point sound source group with the fingerprint image corresponding to the previous point sound source group under the current coordinate system to obtain the fingerprint image acquired by the current point sound source group.
In a specific implementation, a coordinate system in which a fingerprint image detected by the point sound source group is located is used as a current coordinate system. And taking the coordinate system of the fingerprint image acquired by the previous point sound source group as a previous coordinate system.
In a specific implementation, the fingerprint image detected by the fingerprint imaging system is a fingerprint image obtained by amplifying an actual fingerprint image according to a corresponding amplification factor. Therefore, if the fingerprint image acquired by the previous point sound source group is to be spliced with the fingerprint image detected by the current point sound source group, the fingerprint images acquired twice need to be transferred to the same coordinate system. And the proportional relation between the coordinates of the same position between the adjacent coordinate systems is the amplification factor k of the fingerprint imaging system.
For example, in a fingerprint image acquired by the previous dot sound source group, if the position coordinates of a bright dot are (X, Y), the position coordinates of the bright dot corresponding to the current coordinate system are (X, Y), where X is k X and Y is k Y.
In an embodiment of the present invention, the fingerprint image obtained by the previous point sound source group is subjected to position shift, a position coordinate of a bright point where each point sound source in the previous point sound source group is located is determined in the current coordinate system based on an amplification factor of the fingerprint imaging system, and then the fingerprint image obtained by the previous point sound source group is shifted to the current coordinate system according to the amplification factor of the fingerprint imaging system based on a relative distance between the fingerprint image obtained by the previous point sound source group and the bright point corresponding to each point sound source in the previous point sound source group, so as to obtain the fingerprint image corresponding to the previous point sound source group in the current coordinate system. The bright point is a high gray value area formed by directly entering the sound signal of the point sound source into the ultrasonic sensor without reflection.
In other words, when the fingerprint image acquired by the previous point sound source group is subjected to position offset, the position coordinates of each bright point of the fingerprint image acquired by the previous point sound source group may be determined in the current coordinate system, and then the fingerprint information around each bright point may be offset to the current coordinate system. When the fingerprint information around each bright point is shifted to the current coordinate system, the relative distance between each bright point and the fingerprint information around the bright point is reduced according to the amplification factor of the fingerprint imaging system, and then the whole fingerprint information is shifted to the current coordinate system.
Through the conversion of the coordinate system, the fingerprint image can be restored, the image loss can be avoided, and the definition of the restored image is improved. In addition, the final full fingerprint image is obtained by adopting the mode of restoring the fingerprint image in the embodiment of the invention, the process is simpler, the restoring speed is high, and the image quality is better.
In specific implementation, in order to improve the quality of the full fingerprint image, before the fingerprint images are spliced, the fingerprint images to be spliced may be denoised, and then the fingerprint images subjected to the denoising treatment are spliced. The fingerprint images to be spliced are fingerprint images acquired by a previous point sound source group and fingerprint images detected by a current point sound source group.
As can be seen from the above, with the fingerprint imaging method of the terminal according to the embodiment of the present invention, fingerprint detection is performed sequentially using a plurality of point sound source sets, and the obtained fingerprint images are complementary to each other, so that full fingerprint scanning can be achieved. By the time division multiplexing mode, full coverage of the fingerprint is realized, the resolution ratio of the fingerprint image can be effectively improved, and the accuracy of fingerprint identification is finally improved.
In order to make those skilled in the art better understand and implement the present invention, the user terminal and the computer readable storage medium corresponding to the above method are described in detail below.
Referring to fig. 4, an embodiment of the present invention provides a fingerprint imaging apparatus 40 of a terminal. Wherein the terminal comprises a fingerprint imaging system; the fingerprint imaging system includes: a plurality of point sound source group and a plurality of ultrasonic sensor that are the array mode and arrange that are the array mode that arrange, every point sound source group includes at least one point sound source.
The fingerprint imaging device 40 may include: a determination unit 41, a control unit 42, and a fingerprint imaging unit 43. Wherein:
the determination unit 41 is adapted to determine a magnification factor of the fingerprint imaging system;
the control unit 42 is adapted to control each point sound source group to perform fingerprint detection according to a preset sequence when receiving a fingerprint detection instruction;
the fingerprint imaging unit 43 is adapted to splice the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group based on the amplification factor of the fingerprint imaging system, and the spliced fingerprint image is used as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired.
In an embodiment of the present invention, the fingerprint imaging unit 43 may include: a position shift subunit 431 and a splice subunit 432. Wherein:
the position offset subunit 431 is adapted to perform position offset on a fingerprint image acquired by a previous point sound source group based on an amplification factor of the fingerprint imaging system, so as to obtain a fingerprint image corresponding to the previous point sound source group in a current coordinate system; the current coordinate system is a coordinate system where the fingerprint image detected by the current point sound source group is located;
the splicing subunit 432 is adapted to splice the fingerprint image detected by the point sound source group currently with the fingerprint image corresponding to the point sound source group that is previous to the current coordinate system, and use the fingerprint image as the fingerprint image acquired by the point sound source group currently.
In an embodiment of the present invention, the position offset subunit 431 is adapted to determine, in the current coordinate system, position coordinates of bright spots where respective point sound sources in the previous point sound source group are located, based on an amplification factor of the fingerprint imaging system; and shifting the fingerprint image acquired by the previous point sound source group to the current coordinate system according to the amplification factor of the fingerprint imaging system based on the relative distance between the fingerprint image acquired by the previous point sound source group and the bright point corresponding to each point sound source in the previous point sound source group to obtain the fingerprint image corresponding to the previous point sound source group in the current coordinate system.
In an embodiment of the invention, the fingerprint imaging system further comprises: the light-transmitting cover plate is positioned on the display panel below the light-transmitting cover plate; the point sound source group is located below the display panel.
The determining unit 41 may include: a first determining subunit 411, a second determining subunit 412 and a calculating subunit 413. Wherein:
the first determining subunit 411 is adapted to determine a sum of the thickness values of the light-transmitting cover plate and the display panel;
the second determining subunit 412 is adapted to determine a first distance value between a plane where the ultrasonic sensor is located and a plane where the point sound source group is located;
the calculating subunit 413 is adapted to determine the magnification factor of the fingerprint imaging system based on the sum of the thickness values of the transparent cover plate and the display panel and the first distance value.
In an embodiment of the present invention, the calculating subunit 413 is adapted to sum a ratio of the first distance value to a sum of the thickness values of the transparent cover plate and the display panel with a value 2, and obtain a sum result as an amplification factor of the fingerprint imaging system.
In an embodiment of the present invention, the distance between the point sound sources is: and the minimum distance between adjacent point sound sources when the detected fingerprint images are not in contact with or overlapped.
The embodiment of the invention also provides a terminal which can comprise the fingerprint imaging device 40 of the terminal.
In specific implementations, the terminal includes, but is not limited to: personal computer, server, general-purpose computer, special-purpose computer, network equipment, embedded equipment, programmable equipment, intelligent mobile terminal, intelligent home equipment, wearable intelligent equipment, vehicle-mounted intelligent equipment, etc.
The embodiment of the present invention further provides another computer-readable storage medium, where a computer instruction is stored, and when the computer instruction runs, the steps of the fingerprint imaging method of any one of the terminals in the above embodiments are executed, which is not described herein again.
In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The embodiment of the present invention further provides a terminal, where the terminal may include a memory and a processor, where the memory stores a computer instruction capable of being executed on the processor, and when the processor executes the computer instruction, the step of executing any one of the fingerprint imaging methods of the terminal in the above embodiments is performed, and details are not repeated.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (15)
1. A fingerprint imaging method of a terminal is characterized in that the terminal comprises a fingerprint imaging system; the fingerprint imaging system includes: the ultrasonic sensor comprises a plurality of point sound source groups arranged in an array mode and a plurality of ultrasonic sensors arranged in an array mode, wherein each point sound source group comprises at least one point sound source; the method comprises the following steps:
determining a magnification factor of the fingerprint imaging system;
when a fingerprint detection instruction is received, controlling each point sound source group to perform fingerprint detection according to a preset sequence;
and based on the amplification factor of the fingerprint imaging system, splicing the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group, and taking the spliced fingerprint image as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired.
2. The fingerprint imaging method of the terminal according to claim 1, wherein the stitching the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group based on the amplification factor of the fingerprint imaging system comprises:
performing position offset on a fingerprint image acquired by the previous point sound source group based on an amplification factor of the fingerprint imaging system to obtain a fingerprint image corresponding to the previous point sound source group in the current coordinate system; the current coordinate system is a coordinate system where the fingerprint image detected by the current point sound source group is located;
and splicing the fingerprint image detected by the current point sound source group with the fingerprint image corresponding to the previous point sound source group under the current coordinate system to obtain the fingerprint image acquired by the current point sound source group.
3. The fingerprint imaging method of the terminal according to claim 2, wherein the performing a position shift on the fingerprint image acquired by the previous point sound source group based on the amplification factor of the fingerprint imaging system to obtain the fingerprint image corresponding to the previous point sound source group in the current coordinate system comprises:
determining the position coordinates of the bright points where the point sound sources in the previous point sound source group are located in the current coordinate system based on the amplification factor of the fingerprint imaging system;
based on the fingerprint image acquired by the previous point sound source group and the relative distance between the corresponding bright points of each point sound source in the previous point sound source group, the fingerprint image acquired by the previous point sound source group is shifted to the current coordinate system according to the amplification factor of the fingerprint imaging system, and the fingerprint image corresponding to the previous point sound source group in the current coordinate system is acquired.
4. The fingerprint imaging method of a terminal according to claim 1, wherein the fingerprint imaging system further comprises: the light-transmitting cover plate is positioned on the display panel below the light-transmitting cover plate; the point sound source group is positioned below the display panel;
the determining a magnification factor of the fingerprint imaging system comprises:
determining the sum of the thickness values of the light-transmitting cover plate and the display panel;
determining a first distance value between a plane where the ultrasonic sensor is located and a plane where the point sound source group is located;
and determining the amplification factor of the fingerprint imaging system based on the sum of the thickness values of the light-transmitting cover plate and the display panel and the first distance value.
5. The fingerprint imaging method of the terminal according to claim 4, wherein the determining the magnification factor of the fingerprint imaging system based on the sum of the thickness values of the transparent cover plate and the display panel and the first distance value comprises:
and summing the ratio of the first distance value to the sum of the thickness values of the light-transmitting cover plate and the display panel with a numerical value 2 to obtain a summation result which is used as an amplification factor of the fingerprint imaging system.
6. The fingerprint imaging method of a terminal according to claim 1, wherein a minimum value of a distance between adjacent point sound sources when the detected fingerprint images are not in contact with and are not overlapped is used as the distance between the point sound sources.
7. A fingerprint imaging apparatus of a terminal, characterized in that the terminal comprises a fingerprint imaging system; the fingerprint imaging system includes: the ultrasonic sensor comprises a plurality of point sound source groups arranged in an array mode and a plurality of ultrasonic sensors arranged in an array mode, wherein each point sound source group comprises at least one point sound source; the device comprises:
a determination unit adapted to determine a magnification factor of the fingerprint imaging system;
the control unit is suitable for controlling the point sound source groups to carry out fingerprint detection according to a preset sequence when a fingerprint detection instruction is received;
and the fingerprint imaging unit is suitable for splicing the fingerprint image acquired by the previous point sound source group with the fingerprint image detected by the current point sound source group based on the amplification factor of the fingerprint imaging system, and the spliced fingerprint image is used as the fingerprint image acquired by the current point sound source group until a full fingerprint image is acquired.
8. The fingerprint imaging apparatus of a terminal according to claim 7, wherein the fingerprint imaging unit comprises:
the position offset subunit is suitable for performing position offset on a fingerprint image acquired by the previous point sound source group based on an amplification factor of the fingerprint imaging system to obtain a fingerprint image corresponding to the previous point sound source group in the current coordinate system; the current coordinate system is a coordinate system where the fingerprint image detected by the current point sound source group is located;
and the splicing subunit is suitable for splicing the fingerprint image detected by the point sound source group currently with the fingerprint image corresponding to the point sound source group which is one previous to the current coordinate system, and the spliced fingerprint image is used as the fingerprint image acquired by the point sound source group currently.
9. The fingerprint imaging apparatus of a terminal according to claim 8, wherein the position shift subunit is adapted to determine, in the current coordinate system, position coordinates of bright spots where respective point sound sources in a previous point sound source group are located, based on a magnification factor of the fingerprint imaging system; and shifting the fingerprint image acquired by the previous point sound source group to the current coordinate system according to the amplification factor of the fingerprint imaging system based on the relative distance between the fingerprint image acquired by the previous point sound source group and the bright point corresponding to each point sound source in the previous point sound source group to obtain the fingerprint image corresponding to the previous point sound source group in the current coordinate system.
10. The fingerprint imaging apparatus of a terminal according to claim 7, wherein the fingerprint imaging system further comprises: the light-transmitting cover plate is positioned on the display panel below the light-transmitting cover plate; the point sound source group is positioned below the display panel; the determination unit includes:
a first determining subunit, adapted to determine a sum of the thickness values of the light-transmissive cover plate and the display panel;
a second determining subunit, adapted to determine a first distance value between a plane in which the ultrasonic sensor is located and a plane in which the point sound source group is located;
and the calculating subunit is suitable for determining the amplification factor of the fingerprint imaging system based on the sum of the thickness values of the light-transmitting cover plate and the display panel and the first distance value.
11. The fingerprint imaging apparatus of a terminal according to claim 10, wherein said computing subunit is adapted to sum the ratio of said first distance value to the sum of said transparent cover plate and said display panel thickness value with a value of 2 to obtain a sum as the amplification factor of said fingerprint imaging system.
12. The fingerprint imaging apparatus of a terminal according to claim 7, wherein the distance between the point sound sources is: and the minimum distance between adjacent point sound sources when the detected fingerprint images are not in contact with or overlapped.
13. A terminal, comprising: fingerprint imaging apparatus of a terminal according to any of claims 7 to 12.
14. A computer readable storage medium having computer instructions stored thereon, wherein the computer instructions when executed perform the steps of the method of any one of claims 1 to 6.
15. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 6.
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| CN201811421720.XA CN111222376A (en) | 2018-11-26 | 2018-11-26 | Terminal, fingerprint imaging method and device thereof, and computer-readable storage medium |
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| CN201811421720.XA CN111222376A (en) | 2018-11-26 | 2018-11-26 | Terminal, fingerprint imaging method and device thereof, and computer-readable storage medium |
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