CN111183431A - Fingerprint identification method and terminal equipment - Google Patents
Fingerprint identification method and terminal equipment Download PDFInfo
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- CN111183431A CN111183431A CN201780095711.3A CN201780095711A CN111183431A CN 111183431 A CN111183431 A CN 111183431A CN 201780095711 A CN201780095711 A CN 201780095711A CN 111183431 A CN111183431 A CN 111183431A
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- 238000001914 filtration Methods 0.000 description 37
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- 238000003199 nucleic acid amplification method Methods 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 10
- 238000007781 pre-processing Methods 0.000 description 10
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- 238000004891 communication Methods 0.000 description 1
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
Abstract
The embodiment of the application provides a fingerprint identification method and terminal equipment. The method is applied to the terminal equipment, and the terminal equipment comprises the following steps: the fingerprint sensor is positioned below the display screen; the method comprises the following steps: acquiring the intensity of ambient light where the terminal equipment is located; further, based on the comparison between the ambient light intensity and a first threshold value, when the ambient light intensity is less than or equal to the first threshold value, the brightness of the display screen is reduced, and a fingerprint image is collected through a fingerprint sensor; the target fingerprint image meeting the image matching requirement can be acquired in a dark scene, so that the accuracy of fingerprint identification is improved. Furthermore, through reducing the brightness of the display screen, the electric energy resource can be effectively saved, so that the power waiting time of the terminal equipment is prolonged, and the energy-saving effect is achieved.
Description
The present application relates to electronic communication technologies, and in particular, to a fingerprint identification method and a terminal device.
Fingerprint identification technology has been widely used in terminal devices in recent years by virtue of its convenience. With the technical development of terminal devices, front-end fingerprint identification and full-screen display have become one of important development directions. At present, an optical type under-screen fingerprint identification technology is concerned by people.
The existing terminal equipment is suitable for fingerprint collection in a scene with proper ambient light intensity, and a target fingerprint image meeting the image matching requirement may not be collected in a part of ambient light intensity scenes.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification method and terminal equipment, which can be suitable for fingerprint identification under various ambient light intensity scenes.
In a first aspect, an embodiment of the present application provides a fingerprint identification method, where the fingerprint identification method is applied to a terminal device, the terminal device includes a display screen and a fingerprint sensor, and the fingerprint sensor is located below the display screen, and the method includes:
acquiring the intensity of ambient light where the terminal equipment is located;
based on the comparison of the ambient light intensity and the first threshold value, when the ambient light intensity is smaller than or equal to the first threshold value, the brightness of the display screen is reduced, and the fingerprint image is collected through the fingerprint sensor.
In the embodiment of the fingerprint identification method provided by the first aspect, when the intensity of the ambient light is less than or equal to the first threshold, the brightness of the display screen is reduced, and the fingerprint sensor collects the fingerprint image, so that the target fingerprint image meeting the image matching requirement can be collected in a dark scene, and the accuracy of fingerprint identification is improved. Furthermore, through reducing the brightness of the display screen, the electric energy resource can be effectively saved, so that the power waiting time of the terminal equipment is prolonged, and the energy-saving effect is achieved.
In one possible implementation, the method further includes: based on the comparison between the ambient light intensity and the first threshold value and the second threshold value, when the ambient light intensity is greater than the first threshold value and the ambient light intensity is less than the second threshold value, the fingerprint image is collected through the fingerprint sensor.
In the embodiment of the fingerprint identification method provided by the implementation mode, when the intensity of the ambient light is greater than the first threshold value and the intensity of the ambient light is less than the second threshold value, the fingerprint image is collected through the fingerprint sensor, so that the target fingerprint image meeting the image matching requirement can be collected in a common scene, and the accuracy of fingerprint identification is improved.
In one possible implementation, the method further includes:
based on the comparison between the ambient light intensity and the second threshold value, when the ambient light intensity is greater than or equal to the second threshold value, the brightness of the display screen is closed, and a fingerprint image is acquired through a fingerprint sensor;
adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through a fingerprint sensor, wherein the first brightness is more than 600 nits;
and acquiring the fingerprint image according to the fingerprint image acquired under the condition that the display screen is closed and the fingerprint image acquired under the condition that the display screen is at the first brightness.
In the embodiment of the fingerprint identification method provided by the implementation mode, when the intensity of the ambient light is greater than or equal to the second threshold value, the brightness of the display screen is closed, and a fingerprint image is collected through the fingerprint sensor; further, adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through a fingerprint sensor; furthermore, the fingerprint image is acquired according to the fingerprint image acquired under the condition that the display screen is turned off and the fingerprint image acquired under the condition that the display screen is at the first brightness, so that the target fingerprint image meeting the image matching requirement can be acquired under a strong light scene, and the accuracy of fingerprint identification is improved.
In one possible implementation, the first threshold is any value from 80 lux to 1000 lux.
In one possible implementation, the second threshold is any one of 8000 lux to 30000 lux.
In a second aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a display screen, a fingerprint sensor, an ambient light sensor, and a processor, the fingerprint sensor is located below the display screen, and the display screen, the fingerprint sensor, and the ambient light sensor are respectively connected to the processor;
wherein, ambient light sensor is used for detecting the ambient light intensity that terminal equipment is located:
the processor is used for obtaining the ambient light intensity detected by the ambient light sensor, and reducing the brightness of the display screen when the ambient light intensity is smaller than or equal to the first threshold value based on the comparison of the ambient light intensity and the first threshold value, and collecting the fingerprint image through the fingerprint sensor.
In one possible implementation, the processor is further configured to: based on the comparison between the ambient light intensity and the first threshold value and the second threshold value, when the ambient light intensity is greater than the first threshold value and the ambient light intensity is less than the second threshold value, the fingerprint image is collected through the fingerprint sensor.
In one possible implementation, the processor is further configured to:
based on the comparison between the ambient light intensity and the second threshold value, when the ambient light intensity is greater than or equal to the second threshold value, the brightness of the display screen is closed, and a fingerprint image is acquired through a fingerprint sensor;
adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through a fingerprint sensor, wherein the first brightness is more than 600 nits;
and acquiring the fingerprint image according to the fingerprint image acquired under the condition that the display screen is closed and the fingerprint image acquired under the condition that the display screen is at the first brightness.
In one possible implementation, the first threshold is any value from 80 lux to 1000 lux.
In one possible implementation, the second threshold is any one of 8000 lux to 30000 lux.
The beneficial effects of the terminal device provided by the implementation manner of the second aspect may refer to the beneficial effects brought by the implementation manner of the first aspect, and are not described herein again.
In a third aspect, embodiments of the present application provide a computer program product containing instructions, which when executed on a computer, cause the computer to perform the method of the first aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, in which instructions are stored, and when the instructions are executed on a computer, the computer is enabled to execute the method of the first aspect.
Fig. 1 is a schematic structural diagram of a terminal device with fingerprint identification;
fig. 2A is a schematic view of an application scenario provided in the embodiment of the present application;
fig. 2B is a schematic flowchart of a fingerprint identification method according to an embodiment of the present application;
fig. 2C is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 2D is another schematic flowchart of a fingerprint identification method according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating a fingerprint recognition method according to another embodiment of the present application;
FIG. 4 is a flowchart illustrating a fingerprint recognition method according to another embodiment of the present application;
fig. 5 is a flowchart illustrating a fingerprint identification method according to another embodiment of the present application.
First, an application scenario and a part of words related in the embodiments of the present application will be explained.
Fig. 2A is a schematic view of an application scenario provided in the embodiment of the present application. As shown in fig. 2A, when it is determined that a duration of a continuous contact between a finger of a user and a preset identification region in a display screen of a terminal device exceeds a preset duration (e.g., 50ms), or a covered area of the preset identification region in the display screen exceeds a preset area, etc., the fingerprint identification method provided by the embodiment of the present application may be triggered. Of course, the fingerprint identification method provided in the embodiment of the present application may also be applicable to other application scenarios, which is not limited in the embodiment of the present application.
The terminal devices referred to in the present application may include, but are not limited to: the mobile phone, the tablet computer, the personal digital assistant and other devices have a display screen, an ambient light sensor and a fingerprint sensor, but may also be other devices having a display screen, an ambient light sensor and a fingerprint sensor.
The terminal device related to the application can comprise a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a Memory (also referred to as a main Memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like.
The numbers "first" and "second" in the embodiments of the present application are used for distinguishing similar objects, and are not necessarily used for describing a specific order or sequence order, and should not constitute any limitation to the embodiments of the present application.
The fingerprint identification technology related to the embodiment of the application is a biological identification technology which is used for acquiring fingerprint information of a human body through a fingerprint sensor and then comparing the fingerprint information with existing fingerprint template information in a system so as to realize identity identification. The fingerprint identification technology comprises the following steps: optical fingerprint identification technology, capacitive fingerprint identification technology, ultrasonic fingerprint identification technology and the like. Among them, the optical fingerprint recognition technology is attracting attention due to its high sensitivity and high integration.
The fingerprint identification technology related to the embodiment of the application can include but is not limited to: optical fingerprint identification technology; correspondingly, the fingerprint sensor related to the embodiments of the present application may include, but is not limited to: an optical fingerprint sensor.
The display screen related to the embodiment of the present application may be an Organic Light-Emitting Diode (OLED) display screen, and certainly may also be other types of display screens, which is not limited in the embodiment of the present application.
Embodiments of the present application relate to image pre-processing that may include, but is not limited to, filtering and/or magnification processing.
The fingerprint collection method according to the embodiment of the present application may include, but is not limited to, a first fingerprint collection method, a second fingerprint collection method, and a third fingerprint collection method.
The first fingerprint collection method according to the embodiment of the present application may be applicable to a dark scene (or referred to as a scene with low ambient light intensity, for example, a scene corresponding to the ambient light intensity being less than or equal to the first threshold), and the first fingerprint collection method may include, but is not limited to: the brightness of the display screen is reduced (for example, the brightness of the display screen does not exceed 300 nits), and a fingerprint image is collected through the fingerprint sensor. Naturally, the first fingerprint collection mode may further include other operations, for example, filtering the fingerprint image collected by the fingerprint sensor according to the first filtering parameter, and/or further amplifying the fingerprint image to be processed (i.e., the fingerprint image collected by the fingerprint sensor or the fingerprint image obtained after filtering) according to the first amplifying parameter, so as to achieve a noise reduction effect on the fingerprint image collected by the fingerprint sensor, thereby improving the image definition.
The first threshold referred to in this embodiment of the present application may be any value from 80 LUX (LUX) to 1000 LUX (for example, the first threshold may be 100LUX), and of course, the first threshold may be other values, which is not limited in this embodiment of the present application.
The manner of performing filtering processing according to the filtering parameter (e.g., the first filtering parameter, the second filtering parameter, or the third filtering parameter) related to the embodiment of the present application may refer to the manner of performing filtering processing according to the filtering parameter in the existing image preprocessing process, and is not described herein again.
Alternatively, the first filtering parameter may be a low-order filtering parameter (corresponding to a low-order filtering process), the second filtering parameter may be a filtering parameter between the low-order filtering parameter and a high-order filtering parameter, and the third filtering parameter may be a high-order filtering parameter (corresponding to a high-order filtering process).
The manner of performing amplification processing according to the amplification parameter (e.g., the first amplification parameter, the second amplification parameter, or the third amplification parameter) related to the embodiment of the present application may refer to the manner of performing amplification processing according to the amplification parameter in the existing image preprocessing process, and is not described herein again.
Alternatively, the first amplification parameter may be a low amplification parameter (e.g., less than 10), the second amplification parameter may be an amplification parameter between the low amplification parameter and the high amplification parameter (e.g., greater than 20 and less than 50), and the third amplification parameter may be a high amplification parameter (e.g., greater than 100).
The second fingerprint acquisition manner related to the embodiment of the present application may be applicable to a common scene (or referred to as a scene with a suitable ambient light intensity, for example, a scene corresponding to an ambient light intensity that is greater than a first threshold and less than a second threshold), and the second fingerprint acquisition manner may include but is not limited to: and collecting a fingerprint image through a fingerprint sensor. Naturally, the second fingerprint collection mode may further include other operations, for example, filtering the fingerprint image collected by the fingerprint sensor according to the second filtering parameter, and/or further amplifying the fingerprint image to be processed (i.e., the fingerprint image collected by the fingerprint sensor or the fingerprint image obtained after filtering) according to the second amplifying parameter, so as to achieve a noise reduction effect, thereby improving the image definition.
The second threshold referred to in this embodiment of the present application may be any value from 8000 LUX to 30000 LUX (for example, the second threshold may be 10000LUX), and of course, the second threshold may be other values, which is not limited in this embodiment of the present application.
The third fingerprint collection method according to the embodiment of the present application may be applicable to a strong light scene (or referred to as a scene with higher ambient light intensity, for example, a scene corresponding to the ambient light intensity being greater than or equal to the second threshold), and the third fingerprint collection method may include but is not limited to: the method comprises the steps of closing the brightness of a display screen, collecting a fingerprint image through a fingerprint sensor, further adjusting the brightness of the display screen to enable the brightness of the display screen to be in a first brightness (optionally, the first brightness can be larger than 600 nits), collecting the fingerprint image through the fingerprint sensor, and further obtaining the fingerprint image according to the fingerprint image collected under the condition that the brightness of the display screen is closed and the fingerprint image collected under the condition that the display screen is in the first brightness. Of course, the third fingerprint collection mode may further include other operations, for example, filtering the fingerprint image (that is, obtained according to the fingerprint image collected at the brightness of the closed display screen and the fingerprint image collected at the first brightness of the display screen) according to the third filtering parameter, and/or further amplifying the fingerprint image to be processed (that is, obtained according to the fingerprint image collected at the brightness of the closed display screen and the fingerprint image collected at the first brightness of the display screen, or obtained after filtering) according to the third amplification parameter, so as to implement a noise reduction effect, thereby improving the image definition.
One way to control the display color (e.g., white, green, or blue, etc.) of the display screen involved in the embodiments of the present application may be implemented as follows: and selecting pixel points in different areas in the display screen, and respectively providing driving currents for the selected pixel points. Of course, the display color of the display screen may also be controlled in other realizable manners, which is not limited in the embodiment of the present application.
One way to achieve the adjustment of the display brightness of the display screen in the embodiment of the present application is as follows: and adjusting the magnitude of the driving current of the display screen. Of course, the display brightness of the display screen may also be adjusted in other realizable manners, which is not limited in the embodiment of the present application.
As shown in fig. 1, the fingerprint acquisition process of the terminal device with fingerprint identification is as follows: when determining that fingerprint collection is required (for example, the finger 1 is placed above the display screen 2 for more than a preset time, etc.), the controller 6 controls the display screen 2 to generate the emitted light 4; the reflected light 5 is formed by reflection of the emitted light 4 after the emitted light propagates upwards and reaches the finger 1, and the reflected light 5 in different areas is different due to the contact difference between the different areas (such as the valley and the ridge) of the finger 1 and the display screen 2 when the display screen 2 is attached. Further, the fingerprint sensor 3 performs photoelectric conversion on the reflected light 5 irradiated onto the fingerprint sensor 3 after passing through the display screen 2 to obtain a fingerprint image, and transmits the fingerprint image to the processor 6. Further, the processor 6 performs image preprocessing on the fingerprint image collected by the fingerprint sensor 3 to obtain a target fingerprint image.
The terminal device shown in fig. 1 is suitable for fingerprint collection in a scene with appropriate ambient light intensity, and a target fingerprint image meeting the image matching requirement may not be collected in a partial ambient light intensity scene.
According to the fingerprint identification method and the terminal device provided by the embodiment of the application, the intensity of the ambient light where the terminal device is located is obtained, and fingerprint collection is performed in a fingerprint collection mode matched with the intensity of the ambient light (for example, fingerprint collection is performed in a dark scene in a first fingerprint collection mode, fingerprint collection is performed in a common scene in a second fingerprint collection mode, fingerprint collection is performed in a strong light scene in a third fingerprint collection mode, and the like), so that target fingerprint images meeting the image matching requirements can be collected in various ambient light intensity scenes, and the method and the terminal device are suitable for fingerprint identification in various ambient light intensity scenes.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2B is a schematic flowchart of a fingerprint identification method according to an embodiment of the present application, and fig. 2C is a schematic structural diagram of a terminal device according to an embodiment of the present application. Optionally, the fingerprint identification method provided by the embodiment of the application can be applied to terminal equipment. As shown in fig. 2C, the terminal device provided in the embodiment of the present application may include: a display 201 and a fingerprint sensor 202; wherein the fingerprint sensor 202 may be located below the display 201; of course, the fingerprint identification device may further include other components (for example, the ambient light sensor 203 and the processor 204, wherein the display 201, the fingerprint sensor 202, and the ambient light sensor 203 are respectively connected to the processor 204), which is not limited in the embodiment of the present application. As shown in fig. 2B, the method of the embodiment of the present application may include:
and step S21, acquiring the intensity of the ambient light where the terminal device is located.
In this embodiment, optionally, when it is determined that fingerprint collection is required (for example, it is determined that the duration of continuous contact between the finger of the user and the preset identification region in the display screen exceeds a preset duration, the covered area of the preset identification region exceeds a preset area, or the pressure of the preset identification region exceeds a preset pressure, etc.), the intensity of the ambient light at which the terminal device is located may be obtained, and for example, the intensity of the ambient light detected by the ambient light sensor 203 may be obtained. Optionally, the ambient light sensor 203 starts to detect the intensity of the ambient light of the terminal device by sending a detection instruction to the ambient light sensor 203; alternatively, the ambient light sensor 203 may automatically detect the intensity of the ambient light at the terminal device at preset time intervals. Of course, the intensity of the ambient light where the terminal device is located may also be obtained in other ways, which is not limited in the embodiment of the present application.
Alternatively, one achievable process for the ambient light sensor 203 to detect the intensity of the ambient light at which the terminal device is located is as follows:
the ambient light sensor 203 performs photoelectric conversion on the collected ambient light signal to obtain an electric signal, and calculates the electric signal according to a preset algorithm to obtain ambient light intensity; the specific preset algorithm may be an algorithm in an existing ambient light sensor, which is not limited in the embodiment of the present application.
It should be noted that the manner in which the ambient light sensor 203 detects the intensity of the ambient light at which the terminal device is located may also adopt other realizable manners, which is not limited in this embodiment of the application.
And step S22, fingerprint collection is carried out by adopting a fingerprint collection mode matched with the ambient light intensity.
In this embodiment, a fingerprint collection manner that matches the ambient light intensity (i.e., the ambient light intensity at which the terminal device is located obtained in step S21) is adopted to collect fingerprints, so that the method and the device can be applied to various ambient light intensity scenes.
Fig. 2D is another schematic flowchart of a fingerprint identification method according to an embodiment of the present disclosure. Illustratively, as shown in fig. 2D, one implementation of step S22 is described: the fingerprint identification method is determined according to the comparison between the ambient light intensity (i.e. the ambient light intensity at which the terminal device is located obtained in step S21) and at least one threshold (e.g. the first threshold and/or the second threshold). (1) If the ambient light intensity (i.e. the ambient light intensity of the terminal device) is less than or equal to a first threshold (e.g. the terminal device is in a dark scene), performing fingerprint acquisition by using a first fingerprint acquisition mode; (2) if the ambient light intensity is greater than the first threshold and less than a second threshold (for example, the terminal device is in a common scene), fingerprint acquisition is performed in a second fingerprint acquisition mode; (3) if the ambient light intensity is greater than or equal to the second threshold (for example, the terminal device is in a strong light scene), fingerprint acquisition is performed in a third fingerprint acquisition mode.
It should be noted that, in the embodiment of the present application, the description is given by taking an example of dividing the ambient light intensity into three levels (for example, a dim scene, a normal scene, and a bright scene) by comparing the ambient light intensity at which the terminal device is located with two thresholds (for example, a first threshold and a second threshold); of course, the ambient light intensity of the terminal device may be divided into four or more levels by comparing the ambient light intensity with two or more other threshold values, which is not limited in the embodiment of the present application.
It is easy to understand that if it is determined that the intensity of the ambient light at which the terminal device is located is at another level, another fingerprint acquisition mode matching the intensity of the ambient light is used for fingerprint acquisition, which is not limited in the embodiment of the present application.
According to the fingerprint identification method, the ambient light intensity of the terminal device is obtained, and fingerprint collection is carried out in a fingerprint collection mode matched with the ambient light intensity, so that target fingerprint images meeting the image matching requirement can be collected in various ambient light intensity scenes, and the fingerprint identification method is suitable for fingerprint identification in various ambient light intensity scenes.
Fig. 3 is a flowchart illustrating a fingerprint identification method according to another embodiment of the present application. On the basis of the above embodiments, in the embodiments of the present application, a fingerprint identification process when the terminal device is in a dark scene is described. With reference to fig. 2C and fig. 3, a method according to an embodiment of the present application may include:
and step S31, acquiring the intensity of the ambient light where the terminal device is located.
Optionally, in the embodiment, reference may be made to relevant contents related to step S21 in the foregoing embodiment of the present application for implementation of step S31, which is not described herein again.
And step S32, based on the comparison between the ambient light intensity and the first threshold value, when the ambient light intensity is less than or equal to the first threshold value, reducing the brightness of the display screen, and collecting the fingerprint image through the fingerprint sensor.
In a dim scene, as shown in fig. 2C, considering that the ratio of the ambient light a in the light signal received by the fingerprint sensor 202 (including the ambient light a and the reflected light C of the emitted light B generated by the display screen 201 after passing through the finger) is small, the ratio of the reflected light C capable of reflecting the fingerprint feature information in the light signal received by the fingerprint sensor 202 satisfies a preset ratio, so that a target fingerprint image meeting the requirement of image matching can be acquired.
In this embodiment, by comparing the ambient light intensity obtained in step S31 with the first threshold, when the ambient light intensity is less than or equal to the first threshold (that is, the terminal device is in a dark scene), the fingerprint is collected by using the first fingerprint collection method. Optionally, the target fingerprint image is obtained by reducing the brightness of the display screen 201 (for example, making the brightness of the display screen not exceed 300 nits), and acquiring the fingerprint image by the fingerprint sensor 202 (i.e., the fingerprint image after the brightness of the display screen 201 is adjusted), so as to further perform image preprocessing on the fingerprint image acquired by the fingerprint sensor 202. Of course, the first fingerprint acquisition mode may further include at least one of the following operations to obtain the target fingerprint image: before the fingerprint image is collected by the fingerprint sensor 202, the display screen 201 may be controlled to display white light or green light, filter the fingerprint image collected by the fingerprint sensor 202 according to the first filter parameter, further amplify the fingerprint image to be processed (i.e., the fingerprint image collected by the fingerprint sensor 202 or the fingerprint image obtained after the filter processing) according to the first amplification parameter, and so on. Of course, other image preprocessing operations may be further included to achieve a further noise reduction effect on the fingerprint image acquired by the fingerprint sensor, so as to further improve the image definition, which is not limited in the embodiment of the present application.
Alternatively, after the brightness of the display screen 201 is reduced, a first acquisition instruction may be sent to the fingerprint sensor 202, so that the fingerprint sensor 202 starts to acquire the fingerprint image after the brightness of the display screen is reduced according to the first acquisition instruction. Of course, the fingerprint image may be acquired by the fingerprint sensor 202 in other ways, which is not limited in the embodiment of the present application.
In the embodiment of the application, when the ambient light intensity is less than or equal to the first threshold value, the brightness of the display screen is reduced, and the fingerprint image is collected through the fingerprint sensor, so that the target fingerprint image meeting the image matching requirement can be collected in a dark scene, and the accuracy of fingerprint identification is improved. Furthermore, through reducing the brightness of the display screen, the electric energy resource can be effectively saved, so that the power waiting time of the terminal equipment is prolonged, and the energy-saving effect is achieved. Furthermore, the accuracy of fingerprint identification can be further improved by performing filtering processing on the fingerprint image acquired by the fingerprint sensor according to the first filtering parameter, and/or further performing amplification processing on the fingerprint image to be processed according to the first amplification parameter.
Fig. 4 is a flowchart illustrating a fingerprint identification method according to another embodiment of the present application. On the basis of the above embodiments, in the embodiments of the present application, a fingerprint identification process when the terminal device is in a common scene is described. With reference to fig. 2C and fig. 4, a method according to an embodiment of the present application may include:
and step S41, acquiring the intensity of the ambient light where the terminal device is located.
Optionally, in the embodiment, reference may be made to relevant contents related to step S21 in the foregoing embodiment of the present application for implementation of step S41, which is not described herein again.
And step S42, acquiring a fingerprint image through the fingerprint sensor when the ambient light intensity is greater than the first threshold value and less than the second threshold value based on the comparison of the ambient light intensity with the first threshold value and the second threshold value.
In a common scenario, as shown in fig. 2C, considering that the ratio of the ambient light a in the optical signal received by the fingerprint sensor 202 (including the ambient light a and the reflected light C of the emitted light B generated by the display screen 201 after passing through the finger) is small, the ratio of the reflected light C capable of reflecting the fingerprint feature information in the optical signal received by the fingerprint sensor 202 satisfies a preset ratio, so that a target fingerprint image meeting the requirement of image matching can be acquired.
In this embodiment, by comparing the ambient light intensity obtained in step S41 with the first threshold and the second threshold, when the ambient light intensity is greater than the first threshold and the ambient light intensity is less than the second threshold (that is, the terminal device is in a normal scene), the fingerprint is collected in the second fingerprint collection manner. Optionally, a fingerprint image is captured by the fingerprint sensor 202, so as to further perform image preprocessing on the fingerprint image captured by the fingerprint sensor 202 to obtain a target fingerprint image. Of course, the second fingerprint acquisition mode may further include at least one of the following operations to obtain the target fingerprint image: the brightness of the display screen 201 may be adjusted or maintained to make the brightness of the display screen 201 greater than 300 nit (nit) and less than 600 nit (e.g., 450 nit) before the fingerprint image is captured by the fingerprint sensor 202, the display screen 201 may be controlled to display white light, green light, or blue-green mixed light before the fingerprint image is captured by the fingerprint sensor 202, the fingerprint image captured by the fingerprint sensor 202 is filtered according to the second filtering parameter, and the fingerprint image to be processed (i.e., the fingerprint image captured by the fingerprint sensor 202 or the fingerprint image obtained after the filtering process) is further amplified according to the second amplifying parameter, and so on. Of course, other image preprocessing operations may be further included to achieve a further noise reduction effect on the fingerprint image acquired by the fingerprint sensor, so as to further improve the image definition, which is not limited in the embodiment of the present application.
Optionally, after adjusting or maintaining the brightness of the display screen 201, a second capture instruction may be sent to the fingerprint sensor 202, so that the fingerprint sensor 202 starts capturing the fingerprint image according to the second capture instruction. Of course, the fingerprint image may be acquired by the fingerprint sensor 202 in other ways, which is not limited in the embodiment of the present application.
In the embodiment of the application, when the ambient light intensity is greater than the first threshold value and the ambient light intensity is less than the second threshold value, the fingerprint sensor is used for collecting the fingerprint image, so that the target fingerprint image meeting the requirement of image matching can be collected in a common scene, and the accuracy of fingerprint identification is improved. Furthermore, the electric energy resource can be effectively saved by adjusting the brightness of the display screen to be proper brightness, so that the power waiting time of the terminal equipment is prolonged. Furthermore, the accuracy of fingerprint identification can be further improved by performing filtering processing on the fingerprint image acquired by the fingerprint sensor according to the second filtering parameter, and/or further performing amplification processing on the fingerprint image to be processed according to the second amplification parameter.
Fig. 5 is a flowchart illustrating a fingerprint identification method according to another embodiment of the present application. On the basis of the above embodiments, in the embodiments of the present application, a fingerprint identification process when the terminal device is in a strong light scene is described. With reference to fig. 2C and fig. 5, a method according to an embodiment of the present application may include:
and step S51, acquiring the intensity of the ambient light where the terminal device is located.
Optionally, in the embodiment, reference may be made to relevant contents related to step S21 in the foregoing embodiment of the present application for implementation of step S51, which is not described herein again.
Step S52, based on the comparison between the ambient light intensity and the second threshold value, when the ambient light intensity is greater than or equal to the second threshold value, the brightness of the display screen is closed, and the fingerprint image is collected through the fingerprint sensor; adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through a fingerprint sensor; and acquiring the fingerprint image according to the fingerprint image acquired under the condition that the display screen is closed and the fingerprint image acquired under the condition that the display screen is at the first brightness.
In a strong light scene, as shown in fig. 2C, it is considered that the ambient light a causes a substantial decrease in the proportion of the reflected light C capable of reflecting the fingerprint feature information in the optical signal received by the fingerprint sensor 202 (including the ambient light a and the reflected light C generated by the display screen 201 after the emitted light B passes through the finger) (i.e., the proportion of the reflected light C including the fingerprint feature information in the optical signal received by the fingerprint sensor 202 is low), so that a target fingerprint image meeting the image matching requirement cannot be acquired.
In this embodiment, by comparing the ambient light intensity obtained in step S51 with the second threshold, when the ambient light intensity is greater than or equal to the second threshold (that is, the terminal device is in a strong light scene), the fingerprint is collected by using a third fingerprint collection method. Optionally, by turning off the brightness of the display screen 201 and collecting a fingerprint image by the fingerprint sensor 202 (i.e. a fingerprint image after turning off the display screen, or a fingerprint image corresponding to the ambient light a); further, the brightness of the display screen 201 is adjusted to make the brightness of the display screen 201 at a first brightness (optionally, the first brightness may be greater than 600 nits), so as to increase a proportion of the reflected light C containing the fingerprint feature information in the optical signal received by the fingerprint sensor 202, and a fingerprint image is collected by the fingerprint sensor 202 (i.e., the fingerprint image after the brightness of the display screen 201 is adjusted, or the fingerprint image corresponding to the ambient light a and the reflected light C with the increased proportion); further, according to the fingerprint image acquired under the condition that the display screen is turned off in brightness (namely, the fingerprint image corresponding to the ambient light a) and the fingerprint image acquired under the condition that the display screen is in the first brightness (namely, the fingerprint image corresponding to the ambient light a and the fingerprint image corresponding to the reflected light C after the proportion of the reflected light C is increased), the fingerprint image (namely, the fingerprint image corresponding to the reflected light C after the proportion of the reflected light C is increased) is acquired, so that the acquired fingerprint image is subjected to image preprocessing to obtain the target fingerprint image. Optionally, a fingerprint image corresponding to the ambient light a included in the fingerprint image acquired by the display screen at the first brightness is removed instead according to the fingerprint image acquired by closing the display screen at the first brightness (for example, each pixel point in the fingerprint image acquired by the display screen at the first brightness is differed from a corresponding pixel point in the fingerprint image acquired by closing the display screen at the first brightness), so as to determine the fingerprint image (i.e., the fingerprint image corresponding to the fingerprint image after increasing the proportion of the reflected light C). Of course, the fingerprint image corresponding to the ambient light a included in the fingerprint image acquired by the display screen at the first brightness is removed instead according to the fingerprint image acquired by closing the display screen at the first brightness, and the fingerprint image can also be determined in other ways, which is not limited in the embodiment of the application.
Of course, the third fingerprint acquisition mode may further include at least one of the following operations to obtain the target fingerprint image: before the fingerprint image after the brightness adjustment of the display screen 201 is collected through the fingerprint sensor 202, the display screen 201 is controlled to display green light, the fingerprint image (obtained according to the fingerprint image collected under the condition that the brightness of the display screen is closed and the fingerprint image collected under the condition that the display screen is at the first brightness) is filtered according to the third filtering parameter, the fingerprint image to be processed (obtained according to the fingerprint image collected under the condition that the brightness of the display screen is closed and the fingerprint image collected under the condition that the display screen is at the first brightness or obtained after filtering) is further amplified according to the third amplifying parameter, and the like. Of course, other image preprocessing operations may be further included to achieve a further noise reduction effect on the fingerprint image acquired by the fingerprint sensor, so as to further improve the image definition, which is not limited in the embodiment of the present application.
Optionally, after the brightness of the display screen 201 is turned off, a third collecting instruction may be sent to the fingerprint sensor 202, so that the fingerprint sensor 202 starts collecting the fingerprint image according to the third collecting instruction. Optionally, after adjusting the brightness of the display screen to be the first brightness, a fourth capture instruction may be sent to the fingerprint sensor 202, so that the fingerprint sensor 202 starts to capture a fingerprint image according to the fourth capture instruction. Of course, the fingerprint image may be acquired by the fingerprint sensor 202 in other ways, which is not limited in the embodiment of the present application.
In the embodiment of the application, when the ambient light intensity is greater than or equal to the second threshold value, the brightness of the display screen is closed, and a fingerprint image is collected through the fingerprint sensor; further, adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through a fingerprint sensor; furthermore, the fingerprint image is acquired according to the fingerprint image acquired under the condition that the display screen is turned off and the fingerprint image acquired under the condition that the display screen is at the first brightness, so that the target fingerprint image meeting the image matching requirement can be acquired under a strong light scene, and the accuracy of fingerprint identification is improved. Further, the accuracy of fingerprint identification can be further improved by performing filtering processing on the fingerprint image according to the third filtering parameter, and/or further performing amplification processing on the fingerprint image to be processed according to the third amplification parameter, and the like.
In an embodiment of the terminal device provided in this application, referring to fig. 2C, the terminal device provided in this embodiment may include: a display 201, a fingerprint sensor 202, an ambient light sensor 203, and a processor 204. The fingerprint sensor 202 is located below the display screen 201, and the display screen 201, the fingerprint sensor 202, and the ambient light sensor 203 are respectively connected to the processor 204.
The ambient light sensor 203 is configured to detect an intensity of ambient light at which the terminal device is located:
the processor 204 is configured to obtain an intensity of the ambient light detected by the ambient light sensor 203, and based on a comparison between the intensity of the ambient light and a first threshold, reduce the brightness of the display screen 201 when the intensity of the ambient light is less than or equal to the first threshold, and acquire a fingerprint image through the fingerprint sensor 202.
Optionally, the processor 204 is further configured to: based on the comparison of the ambient light intensity with the first threshold and the second threshold, when the ambient light intensity is greater than the first threshold and the ambient light intensity is less than the second threshold, a fingerprint image is captured by the fingerprint sensor 202.
Optionally, the processor 204 is further configured to:
based on the comparison between the ambient light intensity and the second threshold, when the ambient light intensity is greater than or equal to the second threshold, the brightness of the display screen 201 is turned off, and a fingerprint image is acquired through the fingerprint sensor 202;
adjusting the brightness of the display screen 201 to enable the brightness of the display screen 201 to be at a first brightness, and collecting a fingerprint image through the fingerprint sensor 202, wherein the first brightness is greater than 600 nits;
and acquiring a fingerprint image according to the fingerprint image acquired under the condition that the display screen is closed and the fingerprint image acquired under the condition that the display screen 201 is at the first brightness.
Optionally, the first threshold is any value from 80 lux to 1000 lux.
Optionally, the second threshold is any one of 8000 lux to 30000 lux.
The terminal device provided in this embodiment may be configured to execute the technical solution of the method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.
Each functional unit in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Claims (10)
- A fingerprint identification method is applied to a terminal device, the terminal device comprises a display screen and a fingerprint sensor, and the fingerprint sensor is positioned below the display screen, and the method comprises the following steps:acquiring the intensity of ambient light where the terminal equipment is located;and based on the comparison between the ambient light intensity and a first threshold value, when the ambient light intensity is less than or equal to the first threshold value, the brightness of the display screen is reduced, and a fingerprint image is acquired through the fingerprint sensor.
- The method of claim 1, further comprising: and based on the comparison between the ambient light intensity and the first threshold value and the second threshold value, when the ambient light intensity is greater than the first threshold value and the ambient light intensity is less than the second threshold value, collecting a fingerprint image through the fingerprint sensor.
- The method according to claim 1 or 2, characterized in that the method further comprises:based on the comparison between the ambient light intensity and a second threshold value, when the ambient light intensity is greater than or equal to the second threshold value, the brightness of the display screen is closed, and a fingerprint image is collected through the fingerprint sensor;adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through the fingerprint sensor, wherein the first brightness is more than 600 nits;and acquiring a fingerprint image according to the fingerprint image acquired under the condition that the display screen is closed and the fingerprint image acquired under the first brightness of the display screen.
- The method of any one of claims 1-3, wherein the first threshold is any one of 80-1000 lux.
- A method according to claim 2 or 3, wherein the second threshold is any of 8000-30000 lux.
- The utility model provides a terminal equipment, terminal equipment includes display screen, fingerprint sensor, ambient light sensor and treater, fingerprint sensor is located below the display screen, the display screen fingerprint sensor ambient light sensor connects the treater, its characterized in that, ambient light sensor is used for detecting the ambient light intensity that terminal equipment was located:the processor is used for obtaining the ambient light intensity detected by the ambient light sensor, reducing the brightness of the display screen when the ambient light intensity is smaller than or equal to a first threshold value based on the comparison between the ambient light intensity and the first threshold value, and collecting a fingerprint image through the fingerprint sensor.
- The terminal device of claim 6, wherein the processor is further configured to: and based on the comparison between the ambient light intensity and the first threshold value and the second threshold value, when the ambient light intensity is greater than the first threshold value and the ambient light intensity is less than the second threshold value, collecting a fingerprint image through the fingerprint sensor.
- The terminal device of claim 6 or 7, wherein the processor is further configured to:based on the comparison between the ambient light intensity and a second threshold value, when the ambient light intensity is greater than or equal to the second threshold value, the brightness of the display screen is closed, and a fingerprint image is collected through the fingerprint sensor;adjusting the brightness of the display screen to enable the brightness of the display screen to be at a first brightness, and collecting a fingerprint image through the fingerprint sensor, wherein the first brightness is more than 600 nits;and acquiring a fingerprint image according to the fingerprint image acquired under the condition that the display screen is closed and the fingerprint image acquired under the first brightness of the display screen.
- The terminal device according to any of claims 6-8, wherein the first threshold is any of 80-1000 lux.
- A terminal device according to claim 7 or 8, wherein the second threshold is any of 8000 lux to 30000 lux.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2017/113649 WO2019104551A1 (en) | 2017-11-29 | 2017-11-29 | Fingerprint identification method, and terminal device |
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| CN111183431A true CN111183431A (en) | 2020-05-19 |
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| WO (1) | WO2019104551A1 (en) |
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