CN110945526A - Method and device for collecting fingerprint under screen, electronic equipment and storage medium - Google Patents
Method and device for collecting fingerprint under screen, electronic equipment and storage medium Download PDFInfo
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- CN110945526A CN110945526A CN201980002471.7A CN201980002471A CN110945526A CN 110945526 A CN110945526 A CN 110945526A CN 201980002471 A CN201980002471 A CN 201980002471A CN 110945526 A CN110945526 A CN 110945526A
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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
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- G—PHYSICS
- 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
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- G—PHYSICS
- 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
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
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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
- G06V40/1341—Sensing with light passing through the finger
Abstract
The application provides a method and a device for acquiring fingerprints under a screen, electronic equipment and a storage medium, wherein the method comprises the following steps: under the irradiation of a light source, collecting a first fingerprint image of a user; determining a target exposure time of the image sensor according to the pixel value of the first fingerprint image; controlling the exposure time of the image sensor to be the target exposure time; and acquiring a second fingerprint image of the user under the target exposure time. The method and the device have the advantages that the exposure time of the image sensor is adjusted according to the current environment, so that the fingerprint image of the user is continuously acquired in the target exposure time, the quality of the fingerprint image can be effectively improved, and the influence of ambient light on the acquisition of the fingerprint under the screen is avoided.
Description
Technical Field
The present application relates to the field of fingerprint acquisition technologies, and in particular, to a method and an apparatus for acquiring fingerprints under a screen, an electronic device, and a storage medium.
Background
Fingerprint identification technology is an identification means for verifying identity through fingerprint comparison, and is also the most widely applied biometric identification technology at present. With the development of terminal devices and the development of fingerprint identification technologies, the demands of fingerprint identification technologies in the fields of personal computers, smart phones and door locks are also expanding continuously.
In the prior art, during a process of acquiring a fingerprint image of a user, infrared light is generally used as a light source of a fingerprint device under a Liquid Crystal Display (LCD) screen, and light rays irradiate a finger, are transmitted or reflected by the finger, pass through a mobile phone screen and a special optical lens, and are received by a sensor under the screen, so that fingerprint image acquisition and fingerprint identification are realized.
However, in the prior art, since sunlight also contains an infrared band in nature, the fingerprint image of a normal light source is seriously interfered when the light of the sunlight is strong, so that the quality of fingerprint image acquisition is poor.
Disclosure of Invention
The application provides a method and a device for collecting fingerprints under a screen, electronic equipment and a storage medium, so that the collection of fingerprint images is realized, and the quality of the fingerprint images is improved.
In a first aspect, an embodiment of the present application provides a method for acquiring fingerprints under a screen, including:
under the irradiation of a light source, collecting a first fingerprint image of a user;
determining a target exposure time of the image sensor according to the pixel value of the first fingerprint image;
controlling the exposure time of the image sensor to be the target exposure time;
and acquiring a second fingerprint image of the user under the target exposure time.
In the embodiment of the application, the exposure time of the image sensor is determined according to the collected fingerprint image of the user, so that the exposure time of the image sensor is adjusted according to the current environment, the fingerprint image of the user is collected continuously in the target exposure time, the quality of the fingerprint image can be effectively improved, and the influence of ambient light on fingerprint collection under a screen is avoided.
In a possible embodiment, before determining the target exposure time of the image sensor based on the pixel values of the first fingerprint image, the method further comprises:
determining whether the exposure time of the image sensor needs to be adjusted according to a preset strategy;
and if the exposure time of the image sensor needs to be adjusted, determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image.
In the embodiment of the application, whether the exposure time of the image sensor needs to be adjusted or not is determined according to the preset strategy, so that the adjustment of the exposure time of the image sensor under the condition of high fingerprint image quality is avoided, and the quality of the fingerprint image is further ensured.
In one possible implementation, determining a target exposure time of an image sensor from pixel values of a first fingerprint image comprises:
acquiring a first relation between a plurality of global mean values and a plurality of exposure times, wherein the global mean value is the mean value of all pixel values of a fingerprint image of a user;
and determining the target exposure time through the first relation and the global mean value of the first fingerprint image.
In the embodiment of the application, the target exposure time is confirmed according to the relation between the plurality of global mean values and the plurality of exposure times and the global mean value of the first fingerprint image.
In one possible embodiment, obtaining a first relationship between a plurality of global averages and a plurality of exposure times includes:
respectively acquiring fingerprint images at a plurality of exposure times;
determining a global mean value corresponding to each of a plurality of exposure times through the fingerprint images acquired at each of the plurality of exposure times;
a first relationship between the plurality of exposure times and a global mean value corresponding to each of the plurality of exposure times is determined.
Optionally, the method for acquiring fingerprints under a screen provided in the embodiment of the present application further includes:
judging whether the second fingerprint image meets a saturation condition;
and if the second fingerprint image meets the saturation condition, prompting the user that the fingerprint image acquisition fails.
In the embodiment of the application, whether the fingerprint image acquired under the target exposure time meets the saturation condition is judged, and when the fingerprint image is saturated, a user is prompted that the fingerprint image acquisition fails.
Optionally, the method for acquiring fingerprints under a screen provided in the embodiment of the present application further includes:
and if the second fingerprint image does not meet the saturation condition, identifying the second fingerprint image.
In the embodiment of the application, whether the fingerprint image acquired under the target exposure time meets the saturation condition is judged, so that the fingerprint image is identified and processed when the fingerprint image is not saturated.
In one possible embodiment, the preset strategy includes:
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image does not reach the preset number, the exposure time of the image sensor does not need to be adjusted;
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image reaches the preset number, the exposure time of the image sensor needs to be adjusted.
In another possible embodiment, the preset strategy includes:
if all the pixel values in the continuous area in the first fingerprint image are greater than the first pixel value and less than or equal to the second pixel value, the exposure time of the image sensor needs to be adjusted, the second pixel value is the maximum pixel value in the first fingerprint image, and the first pixel value is less than the second pixel value.
The apparatus, the electronic device, the computer-readable storage medium, and the computer program product provided in the embodiments of the present application are described below, and contents and effects thereof may refer to the family insurance recommendation method provided in the embodiments of the present application, and are not described again.
In a second aspect, an embodiment of the present application provides an underscreen fingerprint acquisition apparatus, including:
the acquisition module is used for acquiring a first fingerprint image of a user under the irradiation of a light source;
the first determining module is used for determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image;
the control module is used for controlling the exposure time of the image sensor to be the target exposure time;
and the acquisition module is also used for acquiring a second fingerprint image of the user under the target exposure time.
Optionally, the device for collecting fingerprints under a screen provided in the embodiment of the present application further includes:
the second determining module is used for determining whether the exposure time of the image sensor needs to be adjusted according to a preset strategy;
the first determining module is used for determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image if the exposure time of the image sensor needs to be adjusted.
Optionally, the first determining module includes:
the acquisition submodule is used for acquiring a first relation between a plurality of global mean values and a plurality of exposure times, wherein the global mean value is the mean value of all pixel values of a fingerprint image of a user;
and the determining submodule is used for determining the target exposure time through the first relation and the global mean value of the first fingerprint image.
Optionally, the obtaining sub-module is specifically configured to:
respectively acquiring fingerprint images at a plurality of exposure times;
determining a global mean value corresponding to each of a plurality of exposure times through the fingerprint images acquired at each of the plurality of exposure times;
a first relationship between the plurality of exposure times and a global mean value corresponding to each of the plurality of exposure times is determined.
Optionally, the device for collecting fingerprints under a screen provided in the embodiment of the present application further includes:
the judging module is used for judging whether the second fingerprint image meets the saturation condition;
and the prompting module is used for prompting that the fingerprint image acquisition of the user fails if the second fingerprint image meets the saturation condition.
Optionally, the device for collecting fingerprints under a screen provided in the embodiment of the present application further includes:
and the identification module is used for identifying the second fingerprint image if the second fingerprint image does not meet the saturation condition.
Optionally, the preset policy includes:
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image does not reach the preset number, the exposure time of the image sensor does not need to be adjusted;
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image reaches the preset number, the exposure time of the image sensor needs to be adjusted.
Optionally, the preset policy includes:
if all the pixel values in the continuous area in the first fingerprint image are greater than the first pixel value and less than or equal to the second pixel value, the exposure time of the image sensor needs to be adjusted, the second pixel value is the maximum pixel value in the first fingerprint image, and the first pixel value is less than the second pixel value.
In a third aspect, an embodiment of the present application provides an electronic device, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method as provided by the first aspect or the first aspect realizable manner.
Optionally, the electronic device provided in the embodiment of the present application further includes: the system comprises a light source, an image sensor, an optical filter and a lens, wherein the light source is connected with at least one processor and used for providing illumination for collecting a fingerprint image; the image sensor is connected with at least one processor and is used for collecting fingerprint images; the optical filter is positioned above the image sensor and used for filtering the light penetrating through the lens.
Optionally, the light source is an infrared light source for emitting infrared light;
the light source comprises at least one infrared lamp, or the light source comprises at least one Vertical Cavity Surface Emitting Laser (VCSEL).
Optionally, the light source has a light emission wavelength of 940nm or 850 nm.
Optionally, the light source is located at any of the following positions:
the back light module of the screen, the chin position of the screen or the backlight light compensating area of the screen.
Optionally, the lens is coated with an antireflection film.
In a fourth aspect, embodiments of the present application provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method as provided in the first aspect or the first aspect implementable manner.
In a fifth aspect, an embodiment of the present application provides a computer program product, including: executable instructions for implementing the method as provided in the first aspect or the first aspect alternatives.
In a sixth aspect, an embodiment of the present application provides an underscreen fingerprint acquisition apparatus, which is suitable for an electronic device with a liquid crystal display.
The under-screen fingerprint acquisition device comprises a light source, an image sensor and a lens, wherein the light source is used for providing illumination for a finger above the liquid crystal display screen so as to generate fingerprint detection light on the finger; the camera lens and the image sensor are arranged below the liquid crystal display screen, wherein the camera lens is used for converging the fingerprint detection light passing through the liquid crystal display screen to the image sensor and carrying out fingerprint imaging on the image sensor so as to collect a fingerprint image of a finger; the image sensor is used for acquiring a first fingerprint image of a finger with first exposure time under the irradiation of the light source, wherein the first fingerprint image is used for determining second exposure time of the image sensor, and the second exposure time is used as target exposure time for fingerprint imaging of the fingerprint sensor; and the image sensor is also used for acquiring a second fingerprint image of the finger according to the target exposure time.
In one possible embodiment, the light source includes at least one vertical cavity surface emitting infrared laser for providing infrared light with a wavelength of 940nm to a finger above the liquid crystal display to generate fingerprint detection light, wherein an anti-reflection film having an anti-reflection effect on the infrared light with the wavelength of 940nm is formed on a surface of the lens.
In a possible implementation manner, the device for collecting fingerprints under a screen provided in this embodiment of the present application further includes an optical filter formed between the lens and the fingerprint sensor, where the optical filter is configured to filter out interference light entering the fingerprint sensor, and a light-passing band of the optical filter corresponds to a light-emitting band of the light source.
According to the method, the device, the electronic equipment and the storage medium for collecting the underscreen fingerprint, the first fingerprint image of a user is collected under the irradiation of the light source; then, determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image; further controlling the exposure time of the image sensor to be the target exposure time; and finally, acquiring a second fingerprint image of the user in the target exposure time. Because the exposure time of the image sensor is determined according to the collected fingerprint image of the user, the exposure time of the image sensor is adjusted according to the current environment, and then the fingerprint image of the user is continuously collected in the target exposure time, so that the quality of the fingerprint image can be effectively improved, and the influence of ambient light on fingerprint collection under a screen is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a diagram of an exemplary application scenario provided by an embodiment of the present application;
FIGS. 2A-2C are schematic illustrations of the position of an infrared lamp as provided by examples of the present application;
fig. 3 is a schematic flowchart of an underscreen fingerprint acquisition method according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a first relationship provided by an embodiment of the present application;
FIG. 5 is a schematic flow chart diagram illustrating a method for collecting fingerprints under a screen according to another embodiment of the present application;
FIG. 6 is a schematic flow chart diagram illustrating a method for collecting fingerprints under a screen according to another embodiment of the present application;
FIG. 7 is a schematic structural diagram of an underscreen fingerprint acquisition device provided by an embodiment of the present application;
FIG. 8 is a schematic structural diagram of an underscreen fingerprint acquisition device provided by another embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;
fig. 10 is a schematic structural diagram of an electronic device according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fingerprint identification technology is an identification means for verifying identity through fingerprint comparison, and is also the most widely applied biometric identification technology at present. With the development of terminal devices and the development of fingerprint identification technologies, the demands of fingerprint identification technologies in the fields of personal computers, smart phones and door locks are also expanding continuously. In the prior art, during the process of acquiring a fingerprint image of a user, infrared light is generally used as a light source of a fingerprint device under a screen, and light rays irradiate on a finger, are transmitted or reflected by the finger, pass through a mobile phone screen and a special optical lens, and are received by a sensor under the screen, so that fingerprint image acquisition and fingerprint identification are realized. However, the interference to the fingerprint image when the light of the sunlight is strong cannot be avoided, resulting in poor quality of fingerprint image acquisition. In order to solve the technical problem, embodiments of the present application provide a method and an apparatus for collecting fingerprints under a screen, an electronic device, and a storage medium.
An exemplary application scenario of the embodiments of the present application is described below.
The method for acquiring the fingerprint under the screen provided by the embodiment of the application can be executed by the device for acquiring the fingerprint under the screen provided by the embodiment of the application, the device for acquiring the fingerprint under the screen provided by the embodiment of the application can be part or all of terminal equipment, the terminal equipment can be a television, a notebook computer, a tablet computer, mobile equipment, screen projection equipment and the like, and the type of the terminal equipment is not limited by the embodiment of the application. Fig. 1 is an exemplary application scene diagram provided in the embodiment of the present application, and as shown in fig. 1, the method for acquiring fingerprints under a screen provided in the embodiment of the present application may be applied to a terminal device, where the terminal device may include a touch panel 11(Cover Grass, CG), an LCD display Module 12(LCD Module, LCM), a backlight 13, a backlight strip 14, a light source 15, a lens 16, a filter 17, and an image sensor 18. Light emitted by the light source 15 is incident on the finger of the user through the backlight 13, the LCM12 and the CG11, and then reflected or transmitted inside the finger, and then incident on the lens 16 and the filter 17 to the image sensor 18 through the touch panel 11, the LCM12 and the backlight 13 again, so as to obtain a fingerprint image. The embodiment of the application does not limit the light-emitting band of the light source, and in a possible implementation, the light source is an infrared light source, and the following description takes the light source as an infrared light source and the light emitted by the light source as infrared light as an example; the wavelength of the optical filter corresponds to the infrared light and is used for transmitting the infrared light and eliminating the interference of light except the infrared light; the lens 16 may be a high-power lens to improve the transmittance of infrared light and thus improve the utilization of infrared light.
The light source may include at least one infrared lamp, for example, 2, 4, 6, etc., the wavelength of the infrared lamp may be 940nm, 850nm, etc., the light emitting wavelength of the infrared lamp is not limited in the embodiment of the present application, and in addition, the position of the infrared lamp is also not limited in the embodiment of the present application, for example, fig. 2A to 2C are schematic position diagrams of the infrared lamp provided in the example of the present application, and as shown in fig. 2A, the infrared lamp may be disposed behind the backlight and distributed around the fingerprint region; as shown in fig. 2B, an infrared lamp may be provided in the chin area of the screen; as shown in fig. 2C, the infrared lamp may be disposed in the backlight strip, and the backlight strip further includes a backlight, which is not limited in this embodiment.
Fig. 3 is a schematic flowchart of an off-screen fingerprint acquisition method according to an embodiment of the present application, where the method may be executed by an off-screen fingerprint acquisition apparatus, and the apparatus may be implemented by software and/or hardware, for example: the device may be part or all of a terminal device, the terminal device may be a personal computer, a smart phone, a user terminal, a tablet computer, a wearable device, or the like, the device may also be a central processing unit, or the like, and the method for acquiring the fingerprint under the screen is described below by using the terminal device as an execution main body, as shown in fig. 3, the method for acquiring the fingerprint under the screen provided in the embodiment of the present application may include:
step S101: under the irradiation of a light source, a first fingerprint image of a user is collected.
The embodiment of the application does not limit the structure, type, position, etc. of the light source, and reference may be made to the introduction of the light source in the application scenario, which is not described again. In one possible embodiment, the light source is an infrared lamp.
The embodiment of the application does not limit the light emitting wavelength of the infrared lamp, in a possible implementation manner, the light emitting wavelength of the infrared lamp is 940nm, and as in a natural environment, strong light of a fingerprint under a screen interferes with main sources and sunlight, according to the spectral distribution of the sunlight, the infrared light of 940nm is weaker in the sunlight near the ground, so that the infrared lamp with the light emitting wavelength of 940nm is selected to better avoid the interference of the sunlight, and the embodiment of the application is not limited thereto.
Under the irradiation of the infrared lamp, the first fingerprint image of the user is collected and can be realized through the sensor, and the implementation mode of collecting the first fingerprint image of the user is not limited in the embodiment of the application.
Step S102: a target exposure time of the image sensor is determined based on the pixel values of the first fingerprint image.
After the first fingerprint image is acquired, the first fingerprint image may be preprocessed, for example, abnormal values of pixel points in the first fingerprint image may be removed, binarization processing may be performed on the first fingerprint image, and pixel values of the first fingerprint image may be acquired, which is not limited in this embodiment of the application.
After acquiring the pixel values of the first fingerprint image, the quality of the first fingerprint image may be determined according to the pixel values of the first fingerprint image, and then the exposure time of the image sensor may be adjusted according to the quality of the first fingerprint image to determine the target exposure time of the image sensor. The embodiment of the present application does not limit the specific implementation manner of determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image.
In a possible embodiment, determining a target exposure time of the image sensor from pixel values of the first fingerprint image comprises:
acquiring a first relation between a plurality of global mean values and a plurality of exposure times, wherein the global mean value is the mean value of all pixel values of a fingerprint image of a user; and determining the target exposure time through the first relation and the global mean value of the first fingerprint image.
The first relationship between the plurality of global averages and the plurality of exposure times may be represented in the form of a relationship function, an image, a table, and the like, which is not limited in this application. The first relationship between the plurality of global averages and the plurality of exposure times may be obtained through stored data in the terminal device, or may be determined by calculation, which is not limited in the embodiment of the present application.
In one possible embodiment, obtaining a first relationship between a plurality of global averages and a plurality of exposure times includes:
respectively acquiring fingerprint images at a plurality of exposure times; determining a global mean value corresponding to each of a plurality of exposure times through the fingerprint images acquired at each of the plurality of exposure times; a first relationship between the plurality of exposure times and a global mean value corresponding to each of the plurality of exposure times is determined.
The fingerprint images are acquired at a plurality of exposure times, for example, the fingerprint images may be acquired at a plurality of exposure times with preset time intervals, for example, fig. 4 is a schematic diagram of a first relationship provided in an embodiment of the present application, as shown in fig. 4, the exposure times are 10 milliseconds (ms), 40ms, 70ms … … 340ms, 370ms, 400ms, and the like, and the present application implements no limitation on the length of the preset time intervals and the number of the plurality of exposure times. Acquiring a plurality of fingerprint images in the exposure time respectively, calculating a global mean value of each fingerprint image, wherein the global mean value is the mean value of all pixel values of the fingerprint images, and then determining the global mean value corresponding to each of the exposure time through the fingerprint images acquired in each of the exposure time. Referring to the ordinate in fig. 4, the embodiment of the present application does not limit the specific value of the global mean, and taking the range of the pixel value as 0-5500 as an example, calculating the global mean may normalize the pixel value, and then map the normalized pixel value into the range required by the user. Finally, a relationship function between the plurality of exposure times and the global mean values corresponding to the plurality of exposure times can be determined through piecewise linear fitting, curve fitting and the like, and fig. 4 is a relationship curve between the exposure times and the global threshold.
After determining the first relationship, the target exposure time may be determined by the first relationship and a global mean of the first fingerprint image. The calculation can be made by the following formula:
where t1 is the target exposure time; t0 is the exposure time of the image sensor when the first fingerprint image is acquired; t istargetThe standard exposure time may be obtained through mass production calibration, and the fingerprint image obtained by using the standard exposure time may have a standard global threshold of 2500, which is not limited in this embodiment of the application. In another possible implementation, the standard global threshold is a median value of the pixel value range, and the embodiments of the present application are not limited thereto; t represents the global threshold of the first fingerprint image, the exposure time to the glume in the first relation.
Step S103: and controlling the exposure time of the image sensor to be the target exposure time.
The embodiment of the application does not limit the specific implementation manner of controlling the exposure time of the image sensor as the target exposure time by the terminal device, as long as the exposure time of the image sensor can be controlled as the target exposure time.
Step S104: and acquiring a second fingerprint image of the user under the target exposure time.
And after controlling the exposure time of the image sensor to be the target exposure time, continuously acquiring a second fingerprint image of the user, wherein the second fingerprint image is the fingerprint image of the user acquired under the target exposure time.
According to the method for collecting the fingerprint under the screen, the first fingerprint image of a user is collected under the irradiation of a light source; then, determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image; further controlling the exposure time of the image sensor to be the target exposure time; and finally, acquiring a second fingerprint image of the user in the target exposure time. Because the exposure time of the image sensor is determined according to the collected fingerprint image of the user, the adjustment of the exposure time of the light source is realized according to the current environment, and then the fingerprint image of the user is continuously collected in the target exposure time, so that the quality of the fingerprint image can be effectively improved, and the influence of ambient light on the collection of the fingerprint under the screen is avoided.
In a possible implementation manner, when fingerprints are acquired under different environments, there may be a case where there is no need to adjust the exposure time of the image sensor, and based on this, fig. 5 is a flowchart of an off-screen fingerprint acquisition method provided in another embodiment of the present application, which may be executed by an off-screen fingerprint acquisition apparatus, which may be implemented by software and/or hardware, for example: the apparatus may be part or all of a terminal device, the terminal device may be a personal computer, a smart phone, a user terminal, a tablet computer, a wearable device, or the like, the apparatus may also be a central processing unit, or the like, and the method for acquiring fingerprints under a screen is described below with the terminal device as an execution subject, as shown in fig. 5, the method for acquiring fingerprints under a screen provided in this embodiment of the present application may further include, before step S102:
step S201: and determining whether the exposure time of the image sensor needs to be adjusted according to a preset strategy.
In a possible implementation manner, if the number of pixel values exceeding a preset threshold in the pixel values of the first fingerprint image does not reach a preset number, the exposure time of the image sensor does not need to be adjusted; if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image reaches the preset number, the exposure time of the image sensor needs to be adjusted.
Determining whether the exposure time of the image sensor needs to be adjusted is achieved by judging the number of pixel values exceeding a preset threshold value in the pixel values of the first fingerprint image, and the embodiment of the application does not limit the specific value of the preset threshold value, in a possible implementation manner, the preset threshold value is the maximum value of the pixel values in the terminal device, for example, the maximum value of the pixel values in the terminal device is 255, and the preset threshold value is 255; in addition, the embodiment of the present application does not limit the specific value of the preset number, for example, if a preset threshold exists in the pixel values of the first fingerprint image, the exposure time of the image sensor needs to be adjusted, and then the preset number may be set to 1, which is not limited thereto.
In another possible embodiment, the preset strategy includes:
if all the pixel values in the continuous area in the first fingerprint image are greater than the first pixel value and less than or equal to the second pixel value, the exposure time of the image sensor needs to be adjusted, the second pixel value is the maximum pixel value in the first fingerprint image, and the first pixel value is less than the second pixel value.
The second pixel value is the maximum pixel value in the first fingerprint image, e.g. the range of pixel values of the first fingerprint image is 0-245, then the maximum pixel value in the first fingerprint image is 245, i.e. the second pixel value is 245; the first pixel value is smaller than the second pixel value, for example, the first pixel value is 5 smaller than the second pixel value, and the second pixel value is 245 as an example, and the first pixel value is 240, which is not limited in this embodiment of the application. In addition, optionally, the number of the pixel points in the continuous region may be greater than or equal to the number of the preset pixel points, which is not limited in the embodiment of the present application.
If it is determined that the exposure time of the image sensor needs to be adjusted, step S102 is performed.
After the second fingerprint image is acquired, the second fingerprint image needs to be processed, and in a possible implementation manner, fig. 6 is a schematic flowchart of an off-screen fingerprint acquisition method provided by another embodiment of the present application, where the method may be executed by an off-screen fingerprint acquisition apparatus, and the apparatus may be implemented by software and/or hardware, for example: the device may be part or all of a terminal device, the terminal device may be a personal computer, a smart phone, a user terminal, a tablet computer, a wearable device, or the like, the device may also be a central processing unit, or the like, and the method for acquiring fingerprints under a screen is described below with the terminal device as an execution main body, as shown in fig. 6, the method for acquiring fingerprints under a screen provided in the embodiment of the present application may further include:
step S301: and judging whether the second fingerprint image meets the saturation condition.
The saturation condition may be that pixel values in the second fingerprint image are saturated, or the number of saturated pixel values in the second fingerprint image reaches a preset threshold, which is not limited in the embodiment of the present application. If the second fingerprint image meets the saturation condition, the second fingerprint image is saturated, and the quality of the second fingerprint image is poor; if the second fingerprint image does not meet the saturation condition, the second fingerprint image can be processed in the next step.
If the second fingerprint image satisfies the saturation condition, step S302 is executed.
Step S302: and prompting the user that the fingerprint image acquisition fails.
The embodiment of the application does not limit the specific implementation form of prompting the user that the fingerprint image acquisition fails, for example, the information that the fingerprint image acquisition fails or the information that the fingerprint image needs to be acquired again can be pushed to the user. For another example, the user may be prompted that the fingerprint image acquisition fails, etc. directly by not performing a service requiring fingerprint determination.
If the second fingerprint image does not satisfy the saturation condition, step S303 is executed.
Step S303: a second fingerprint image is identified.
After the second fingerprint image is acquired, identifying the second fingerprint image to perform services related to fingerprint identification in the terminal device, such as: open screen, authentication, etc. The embodiment of the present application does not limit this.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 7 is a schematic structural diagram of an off-screen fingerprint acquisition apparatus provided in an embodiment of the present application, which may be implemented by software and/or hardware, for example: the device can be partial or whole of terminal equipment, and terminal equipment can be personal computer, smart mobile phone, user terminal, panel computer, wearable equipment etc. as shown in fig. 7, the fingerprint collection system under the screen that this application embodiment provided can include:
the collecting module 71 is configured to collect a first fingerprint image of a user under illumination of a light source.
A first determination module 72 for determining a target exposure time of the image sensor based on pixel values of the first fingerprint image.
And the control module 73 is used for controlling the exposure time of the image sensor to be the target exposure time.
And the acquisition module 71 is further configured to acquire a second fingerprint image of the user during the target exposure time.
Optionally, fig. 8 is a schematic structural diagram of an off-screen fingerprint acquisition apparatus provided in another embodiment of the present application, where the apparatus may be implemented by software and/or hardware, for example: the device can be partial or whole of terminal equipment, and terminal equipment can be personal computer, smart mobile phone, user terminal, panel computer, wearable equipment etc. as shown in fig. 8, the fingerprint collection system under the screen that this application embodiment provided can also include:
and a second determining module 74, configured to determine whether the exposure time of the image sensor needs to be adjusted according to a preset strategy.
A first determining module 72, configured to determine a target exposure time of the image sensor according to a pixel value of the first fingerprint image if the exposure time of the image sensor needs to be adjusted.
In one possible embodiment, the preset strategy includes:
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image does not reach the preset number, the exposure time of the image sensor does not need to be adjusted;
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image reaches the preset number, the exposure time of the image sensor needs to be adjusted.
In another possible embodiment, the preset strategy includes:
if all the pixel values in the continuous area in the first fingerprint image are greater than the first pixel value and less than or equal to the second pixel value, the exposure time of the image sensor needs to be adjusted, the second pixel value is the maximum pixel value in the first fingerprint image, and the first pixel value is less than the second pixel value.
Optionally, as shown in fig. 8, the first determining module 72 includes:
an obtaining sub-module 721 configured to obtain a first relationship between a plurality of global averages and a plurality of exposure times, where the global average is an average of all pixel values of the fingerprint image of the user;
the determining sub-module 722 is configured to determine the target exposure time by the first relationship and the global mean of the first fingerprint image.
Optionally, the obtaining sub-module 721 is specifically configured to:
respectively acquiring fingerprint images at a plurality of exposure times;
determining a global mean value corresponding to each of a plurality of exposure times through the fingerprint images acquired at each of the plurality of exposure times;
a first relationship between the plurality of exposure times and a global mean value corresponding to each of the plurality of exposure times is determined.
Optionally, as shown in fig. 8, the device for collecting fingerprints under a screen provided in the embodiment of the present application may further include:
a judging module 75, configured to judge whether the second fingerprint image satisfies a saturation condition;
and the prompting module 76 is configured to prompt the user that the fingerprint image acquisition fails if the second fingerprint image meets the saturation condition.
Optionally, as shown in fig. 8, the device for collecting fingerprints under a screen provided in the embodiment of the present application may further include:
and the identifying module 77 is configured to identify the second fingerprint image if the second fingerprint image does not satisfy the saturation condition.
The device embodiments provided in the present application are merely schematic, and the module division in fig. 7 and fig. 8 is only one logic function division, and there may be other division ways in actual implementation. For example, multiple modules may be combined or may be integrated into another system. The coupling of the various modules to each other may be through interfaces that are typically electrical communication interfaces, but mechanical or other forms of interfaces are not excluded. Thus, modules described as separate components may or may not be physically separate, may be located in one place, or may be distributed in different locations on the same or different devices.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 9, the electronic device includes:
a processor 91, a memory 92, a transceiver 93, and a computer program; wherein the transceiver 93 implements data transmission with other devices, a computer program is stored in the memory 92 and configured to be executed by the processor 91, the computer program comprising instructions for performing the above-mentioned method for collecting fingerprints under screen, the contents and effects thereof please refer to the method embodiment.
Optionally, fig. 10 is a schematic structural diagram of an electronic device provided in another embodiment of the present application, and as shown in fig. 10, the electronic device provided in the embodiment of the present application may further include: the fingerprint image acquisition system comprises a light source 15, an image sensor 18, an optical filter 17 and a lens 16, wherein the light source 15 is connected with at least one processor 19 and is used for providing illumination for acquiring a fingerprint image; the image sensor 18 is connected to at least one processor 19 for acquiring fingerprint images; the filter 17 is located above the image sensor 18 and filters light transmitted through the lens 16.
Fig. 10 shows unclear points, and reference may be made to fig. 1 and the description of fig. 1, which will not be repeated.
Optionally, the light source is an infrared light source for emitting infrared light;
the light source comprises at least one infrared lamp, or the light source comprises at least one vertical cavity surface emitting laser.
Optionally, the light source has a light emission wavelength of 940nm or 850 nm.
Optionally, the light source is located at any of the following positions: the back light module of the screen, the chin position of the screen or the backlight light compensating area of the screen. Reference may be made to fig. 2A-2B.
Optionally, the lens is coated with an antireflection film. The material of the antireflection film is not limited in the embodiments of the present application.
The embodiment of the application provides a fingerprint collection system under screen, is applicable to the electronic equipment who has liquid crystal display.
The under-screen fingerprint acquisition device comprises a light source, an image sensor and a lens, wherein the light source is used for providing illumination for a finger above the liquid crystal display screen so as to generate fingerprint detection light on the finger; the camera lens and the image sensor are arranged below the liquid crystal display screen, wherein the camera lens is used for converging the fingerprint detection light passing through the liquid crystal display screen to the image sensor and carrying out fingerprint imaging on the image sensor so as to collect a fingerprint image of a finger; the image sensor is used for acquiring a first fingerprint image of a finger with first exposure time under the irradiation of the light source, wherein the first fingerprint image is used for determining second exposure time of the image sensor, and the second exposure time is used as target exposure time for fingerprint imaging of the fingerprint sensor; and the image sensor is also used for acquiring a second fingerprint image of the finger according to the target exposure time.
In one possible embodiment, the light source includes at least one vertical cavity surface emitting infrared laser for providing infrared light with a wavelength of 940nm to a finger above the liquid crystal display to generate fingerprint detection light, wherein an anti-reflection film having an anti-reflection effect on the infrared light with the wavelength of 940nm is formed on a surface of the lens.
In a possible implementation manner, the device for collecting fingerprints under a screen provided in this embodiment of the present application further includes an optical filter formed between the lens and the fingerprint sensor, where the optical filter is configured to filter out interference light entering the fingerprint sensor, and a light-passing band of the optical filter corresponds to a light-emitting band of the light source.
In addition, embodiments of the present application further provide a computer-readable storage medium, in which computer-executable instructions are stored, and when at least one processor of the user equipment executes the computer-executable instructions, the user equipment performs the above-mentioned various possible methods.
Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in user equipment. Of course, the processor and the storage medium may reside as discrete components in a communication device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (26)
1. An underscreen fingerprint acquisition method is characterized by comprising the following steps:
under the irradiation of a light source, collecting a first fingerprint image of a user;
determining target exposure time of an image sensor according to the pixel value of the first fingerprint image;
controlling the exposure time of the image sensor to be the target exposure time;
and acquiring a second fingerprint image of the user under the target exposure time.
2. The method of claim 1, further comprising, prior to determining a target exposure time of an image sensor from pixel values of the first fingerprint image:
determining whether the exposure time of the image sensor needs to be adjusted according to a preset strategy;
and if the exposure time of the image sensor needs to be adjusted, determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image.
3. The method of claim 2, wherein determining a target exposure time of the image sensor from pixel values of the first fingerprint image comprises:
acquiring a first relation between a plurality of global mean values and a plurality of exposure times, wherein the global mean value is the mean value of all pixel values of the fingerprint image of the user;
and determining the target exposure time according to the first relation and the global mean value of the first fingerprint image.
4. The method of claim 3, wherein obtaining a first relationship between a plurality of global means and a plurality of exposure times comprises:
acquiring fingerprint images at the plurality of exposure times respectively;
determining a global mean value corresponding to each of the plurality of exposure times through the fingerprint image acquired at each of the plurality of exposure times;
determining a first relationship between the plurality of exposure times and a global mean value corresponding to each of the plurality of exposure times.
5. The method according to any one of claims 1-4, further comprising:
judging whether the second fingerprint image meets a saturation condition;
and if the second fingerprint image meets the saturation condition, prompting that the fingerprint image acquisition of the user fails.
6. The method of claim 5, further comprising:
and if the second fingerprint image does not meet the saturation condition, identifying the second fingerprint image.
7. The method according to any one of claims 2-4, wherein the pre-setting policy comprises:
if the number of the pixel values exceeding a preset threshold value in the pixel values of the first fingerprint image does not reach a preset number, the exposure time of the image sensor does not need to be adjusted;
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image reaches the preset number, the exposure time of the image sensor needs to be adjusted.
8. The method according to any one of claims 2-4, wherein the preset policy comprises:
if all pixel values in the continuous area in the first fingerprint image are greater than a first pixel value and less than or equal to a second pixel value, the exposure time of the image sensor needs to be adjusted, the second pixel value is the maximum pixel value in the first fingerprint image, and the first pixel value is less than the second pixel value.
9. A finger print collection system under screen, comprising:
the acquisition module is used for acquiring a first fingerprint image of a user under the irradiation of a light source;
the first determining module is used for determining the target exposure time of the image sensor according to the pixel value of the first fingerprint image;
the control module is used for controlling the exposure time of the image sensor to be the target exposure time;
the acquisition module is further configured to acquire a second fingerprint image of the user within the target exposure time.
10. The apparatus of claim 9, further comprising:
the second determining module is used for determining whether the exposure time of the image sensor needs to be adjusted according to a preset strategy;
the first determining module is configured to determine a target exposure time of the image sensor according to a pixel value of the first fingerprint image if the exposure time of the image sensor needs to be adjusted.
11. The apparatus of claim 10, wherein the first determining module comprises:
the acquisition submodule is used for acquiring a first relation between a plurality of global mean values and a plurality of exposure times, wherein the global mean value is the mean value of all pixel values of the fingerprint image of the user;
and the determining submodule is used for determining the target exposure time according to the first relation and the global mean value of the first fingerprint image.
12. The apparatus according to claim 11, wherein the obtaining sub-module is specifically configured to:
acquiring fingerprint images at the plurality of exposure times respectively;
determining a global mean value corresponding to each of the plurality of exposure times through the fingerprint image acquired at each of the plurality of exposure times;
determining a first relationship between the plurality of exposure times and a global mean value corresponding to each of the plurality of exposure times.
13. The apparatus of any one of claims 9-12, further comprising:
the judging module is used for judging whether the second fingerprint image meets the saturation condition;
and the prompting module is used for prompting that the fingerprint image acquisition of the user fails if the second fingerprint image meets the saturation condition.
14. The apparatus of claim 13, further comprising:
and the identification module is used for identifying the second fingerprint image if the second fingerprint image does not meet the saturation condition.
15. The apparatus according to any one of claims 10-12, wherein the preset policy comprises:
if the number of the pixel values exceeding a preset threshold value in the pixel values of the first fingerprint image does not reach a preset number, the exposure time of the image sensor does not need to be adjusted;
if the number of the pixel values exceeding the preset threshold value in the pixel values of the first fingerprint image reaches the preset number, the exposure time of the image sensor needs to be adjusted.
16. The apparatus according to any one of claims 10-12, wherein the preset policy comprises:
if all pixel values in the continuous area in the first fingerprint image are greater than a first pixel value and less than or equal to a second pixel value, the exposure time of the image sensor needs to be adjusted, the second pixel value is the maximum pixel value in the first fingerprint image, and the first pixel value is less than the second pixel value.
17. An electronic device, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-8.
18. The electronic device of claim 17, further comprising: the light source is connected with the at least one processor and used for providing illumination for collecting fingerprint images; the image sensor is connected with the at least one processor and is used for collecting fingerprint images; the optical filter is positioned above the image sensor and used for filtering the light penetrating through the lens.
19. The electronic device of claim 18, wherein the light source is an infrared light source for emitting infrared light;
the light source comprises at least one infrared lamp, or the light source comprises at least one vertical cavity surface emitting laser, VCSEL.
20. The electronic device according to claim 19, wherein the light source emits light at a wavelength of 940nm or 850 nm.
21. The electronic device of claim 20, wherein the light source is located at any of:
the back light module of the screen, the chin position of the screen or the backlight light compensating area of the screen.
22. The electronic device of claim 20, wherein the lens is coated with an antireflection coating.
23. A non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the method of any one of claims 1-8.
24. An under-screen fingerprint acquisition device is suitable for an electronic device with a liquid crystal display screen, and is characterized by comprising a light source, an image sensor and a lens, wherein the light source is used for providing illumination for a finger above the liquid crystal display screen so as to generate fingerprint detection light on the finger; the lens and the image sensor are arranged below the liquid crystal display screen, wherein the lens is used for converging the fingerprint detection light passing through the liquid crystal display screen to the image sensor and carrying out fingerprint imaging on the image sensor so as to acquire a fingerprint image of the finger; the image sensor is used for acquiring a first fingerprint image of the finger with a first exposure time under the irradiation of the light source, wherein the first fingerprint image is used for determining a second exposure time of the image sensor, and the second exposure time is used as a target exposure time for fingerprint imaging of the fingerprint sensor; and the image sensor is also used for acquiring a second fingerprint image of the finger according to the target exposure time.
25. The device according to claim 24, wherein the light source comprises at least one vertical cavity surface emitting infrared laser, the vertical cavity surface emitting laser is configured to provide infrared light with a wavelength of 940nm to a finger above the liquid crystal display screen to generate the fingerprint detection light, and an anti-reflection film having an anti-reflection effect on the infrared light with a wavelength of 940nm is formed on a surface of the lens.
26. The device according to claim 25, further comprising an optical filter formed between the lens and the fingerprint sensor, the optical filter being configured to filter out interference light entering the fingerprint sensor, wherein a light-passing band of the optical filter corresponds to a light-emitting band of the light source.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2019/113247 WO2021077393A1 (en) | 2019-10-25 | 2019-10-25 | Below-screen fingerprint acquisition method and apparatus, electronic device, and storage medium |
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| CN110945526B CN110945526B (en) | 2023-10-24 |
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| CN110945526B (en) | 2023-10-24 |
| WO2021077393A1 (en) | 2021-04-29 |
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