WO2017067256A1 - 一种待识别指纹图像的获取方法、装置及移动终端 - Google Patents

一种待识别指纹图像的获取方法、装置及移动终端 Download PDF

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Publication number
WO2017067256A1
WO2017067256A1 PCT/CN2016/091800 CN2016091800W WO2017067256A1 WO 2017067256 A1 WO2017067256 A1 WO 2017067256A1 CN 2016091800 W CN2016091800 W CN 2016091800W WO 2017067256 A1 WO2017067256 A1 WO 2017067256A1
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WIPO (PCT)
Prior art keywords
fingerprint
fingerprint image
preset
fingerprint sensor
image
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PCT/CN2016/091800
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English (en)
French (fr)
Inventor
张强
王立中
周海涛
蒋奎
贺威
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广东欧珀移动通信有限公司
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Publication of WO2017067256A1 publication Critical patent/WO2017067256A1/zh

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1306Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/1347Preprocessing; Feature extraction

Definitions

  • Embodiments of the present invention relate to the field of fingerprint identification technologies, and in particular, to a method, an apparatus, and a mobile terminal for acquiring a fingerprint image to be recognized.
  • Biometrics such as fingerprints have characteristics such as lifetime invariance, uniqueness, and convenience.
  • the biometric-based authentication method has high security performance and has been widely used.
  • fingerprint recognition technology has matured and has high stability and reliability. Therefore, fingerprint sensors are usually integrated in mobile terminals for scenes requiring fingerprint authentication, such as terminal unlocking, application unlocking, and fingerprint payment. Wait for the scene.
  • the surface of the finger or the fingerprint sensor is contaminated with water such as water, sweat or grease, and the fingerprint image of the obtained fingerprint image is unclear.
  • the fingerprint image is matched as the fingerprint image to be identified and the fingerprint template, which may cause problems in fingerprint matching and affect the normal use of the user.
  • the object of the present invention is to provide a method, a device and a mobile terminal for acquiring a fingerprint image to be recognized, so as to solve the problem that a fingerprint image to be recognized cannot be obtained when the surface of the fingerprint sensor is filled with liquid in the existing fingerprint identification scheme. .
  • an embodiment of the present invention provides a method for acquiring a fingerprint image to be recognized, including:
  • the fingerprint image is acquired by the fingerprint sensor
  • an embodiment of the present invention provides an apparatus for improving a fingerprint recognition rate, including:
  • a fingerprint image acquiring module configured to acquire a fingerprint image by using a fingerprint sensor when a fingerprint recognition event is detected
  • a definition determining module configured to determine whether the definition of the fingerprint image reaches a preset standard
  • a temperature increasing control module configured to control the temperature of the fingerprint sensor when determining that the sharpness of the fingerprint image does not reach a preset standard
  • the fingerprint image determining module to be used is configured to continue acquiring the fingerprint image by the fingerprint sensor when the fingerprint sensor is heated, until the fingerprint image with the resolution reaching the preset standard is obtained, and the resolution is achieved.
  • the fingerprint image of the preset standard is used as the fingerprint image to be recognized.
  • an embodiment of the present invention provides a mobile terminal, including an apparatus for acquiring a fingerprint image to be identified in the embodiment of the present invention.
  • the fingerprint image is acquired by the fingerprint sensor to determine whether the resolution of the fingerprint image reaches a preset standard, and if not, the fingerprint sensor is heated. And obtaining the fingerprint image through the fingerprint sensor until the fingerprint image whose resolution reaches the preset standard is obtained, and the fingerprint image whose resolution reaches the preset standard is used as the fingerprint image to be recognized.
  • the sharpness of the fingerprint image can be improved, and the fingerprint image can be continuously obtained through the fingerprint sensor until the fingerprint image with the definition reaching the preset standard is obtained, and the resolution is reached.
  • the fingerprint image of the standard is preset as the fingerprint image to be recognized. Subsequently, the fingerprint image to be identified can be used for fingerprint recognition, thereby improving the success rate of fingerprint recognition and improving the user experience.
  • FIG. 1 is a schematic flowchart of a method for acquiring a fingerprint image to be recognized according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart of a method for acquiring a fingerprint image to be identified according to Embodiment 2 of the present invention
  • FIG. 3 is a structural block diagram of an apparatus for acquiring a fingerprint image to be recognized according to Embodiment 3 of the present invention.
  • FIG. 1 is a schematic flowchart diagram of a method for acquiring a fingerprint image to be recognized according to Embodiment 1 of the present invention.
  • the method can be performed by an acquisition device of the fingerprint image to be identified, wherein the device can be implemented by software and/or hardware, and can generally be integrated in a mobile terminal.
  • the method includes:
  • Step 101 When the fingerprint recognition event is detected, the fingerprint image is acquired by the fingerprint sensor.
  • the mobile terminal in this embodiment may be a device such as a mobile phone, a smart watch, a tablet computer, and a notebook computer configured with a fingerprint sensor.
  • the apparatus for performing the method in this embodiment is not limited to being integrated in a mobile terminal, but may be integrated into other electronic devices such as a desktop computer or a card punching machine equipped with a fingerprint sensor, and is generally integrated in the mobile terminal. The reason for this is that the beneficial effects are more obvious. Therefore, the embodiment of the present invention is only described by being integrated into a mobile terminal as an example.
  • the fingerprint identification event may specifically be a scene that requires fingerprint recognition, such as terminal unlocking, application unlocking, and fingerprint payment.
  • the user presses the fingerprint sensor with a finger to cause the fingerprint sensor to acquire the fingerprint image.
  • the fingerprint sensor mainly includes an optical fingerprint sensor and a semiconductor fingerprint sensor.
  • these fingerprint sensors depend on the uneven texture of the fingerprint on the finger surface.
  • the surface of the user's finger is stained with water such as water, sweat or grease, or the liquid on the surface of the fingerprint sensor itself, the sharpness of the acquired fingerprint image is affected, which may easily lead to fingerprint recognition failure.
  • the finger surface is in contact with the surface of the fingerprint sensor when the fingerprint image is acquired, and the liquid exists between the surface of the finger and the surface of the fingerprint sensor, it can be considered that the liquid exists on both the surface of the finger and the surface of the fingerprint sensor for convenience.
  • the following is represented only by the presence of liquid on the surface of the finger.
  • the following is an example of a capacitive fingerprint sensor in a semiconductor fingerprint sensor.
  • the skin on the surface of the finger and the fingerprint sensor form a capacitance. Since the surface of the finger is uneven, the actual distance between the bump and the concave point and the fingerprint sensor is not Similarly, the capacitance value formed is different, and the collected capacitance value is processed to obtain a fingerprint image. When there is liquid on the surface of the finger, the liquid will cause the collected capacitance value to be inaccurate, resulting in blurring of the fingerprint image.
  • Step 102 Determine whether the definition of the fingerprint image reaches a preset standard. If not, control the temperature of the fingerprint sensor, and continue to acquire the fingerprint image through the fingerprint sensor until the fingerprint image with the resolution reaching the preset standard is obtained, and the resolution is reached.
  • the fingerprint image of the standard is preset as the fingerprint image to be recognized.
  • this step measures the image quality of the acquired fingerprint image to determine whether the resolution reaches a preset standard.
  • the preset criterion corresponds to a condition that the fingerprint image can be successfully recognized by the fingerprint when the user's finger is correct, and those skilled in the art can determine the preset standard corresponding to the actually used fingerprint sensor through experimental or theoretical calculation.
  • the fingerprint image obtained by the common fingerprint sensor is a grayscale image.
  • the following is an example of a fingerprint image as a grayscale image.
  • the average value of the gray values of all the pixels in the fingerprint image may be calculated; when the average value is less than the preset average value, it is determined that the sharpness of the fingerprint image does not reach the preset standard; The shallower the fingerprint image, it is not conducive to recognition.
  • the surface of the finger is likely to have oil stains; when the average value is large, the variance is small, indicating that the image is nearly black, the resolution is not up to the preset standard, and the surface of the finger is likely to have water or sweat; Large, the variance is very large, indicating that the image at this time is better, easy to identify, and the clarity can be considered to have reached the preset standard.
  • the temperature of the fingerprint sensor is controlled.
  • the power of the fingerprint sensor can be increased to heat up the fingerprint sensor, or the heating device corresponding to the fingerprint sensor can be heated to heat the fingerprint sensor.
  • increasing the power of the fingerprint sensor can increase the current value or the gain value of the fingerprint sensor.
  • the heating device may specifically be an electric heating device, such as a heating wire, a hot plate, a heating cable, an electric heating coil, etc., and may be disposed at one side or around the fingerprint sensor.
  • the specific type, size and location of the heating device are not specifically limited in this embodiment, and those skilled in the art can select and design according to actual application conditions.
  • the maximum temperature of the fingerprint sensor can be controlled to be lower than the temperature that would make the user feel hot.
  • Controlling the temperature rise of the fingerprint sensor speeds up the evaporation of liquid on the surface of the finger, thereby reducing the effect of the liquid on the sharpness of the fingerprint image.
  • the fingerprint image can be continuously acquired by the fingerprint sensor until the fingerprint image whose resolution reaches the preset standard is obtained, and the fingerprint image whose resolution reaches the preset standard is used as the fingerprint image to be recognized.
  • the fingerprint image may continue to be acquired after a certain time interval (eg, 1 second) after the temperature rise begins.
  • the frequency at which the fingerprint image is acquired is not specifically limited. As an example, it can be set to 2 times per second. Each time the fingerprint image is acquired, it is determined whether the sharpness of the fingerprint image acquired this time reaches a preset standard. If not, the fingerprint image is continuously acquired; if it has been reached, the fingerprint image is used as the fingerprint image to be recognized. And stop getting the fingerprint image.
  • the method for acquiring a fingerprint image to be recognized acquires a fingerprint image through a fingerprint sensor when the fingerprint recognition event is detected, and determines whether the resolution of the fingerprint image reaches a preset standard, and if not, controls the temperature of the fingerprint sensor. And obtaining the fingerprint image through the fingerprint sensor until the fingerprint image whose resolution reaches the preset standard is obtained, and the fingerprint image whose resolution reaches the preset standard is used as the fingerprint image to be recognized.
  • the sharpness of the fingerprint image can be improved, and the fingerprint image can be continuously obtained through the fingerprint sensor until the fingerprint image with the definition reaching the preset standard is obtained, and the resolution is reached.
  • the fingerprint image of the standard is preset as the fingerprint image to be recognized. Subsequently, the fingerprint image to be identified can be used for fingerprint recognition, thereby improving the success rate of fingerprint recognition and improving the user experience.
  • FIG. 2 is a schematic flowchart diagram of a method for acquiring a fingerprint image to be recognized according to Embodiment 2 of the present invention. This embodiment optimizes the process of controlling the temperature rise of the fingerprint sensor based on the above embodiment.
  • the method of this embodiment includes the following steps:
  • Step 201 When the fingerprint recognition event is detected, the fingerprint image is acquired by the fingerprint sensor.
  • Step 202 Determine whether the definition of the fingerprint image reaches a preset standard. If yes, go to step 210; otherwise, go to step 203.
  • step 210 can be performed; the fingerprint image acquired for the first time is taken as the fingerprint image to be recognized and is followed.
  • the fingerprint identification related operation, the specific identification process can be the same as the existing identification process, and will not be described herein. If the resolution of the fingerprint image acquired for the first time does not reach the preset standard, step 203 is performed; that is, the fingerprint sensor is controlled to start to heat up.
  • Step 203 Control the fingerprint sensor to start heating up.
  • the power of the fingerprint sensor can be increased or the fingerprint sensor can be heated.
  • Step 204 Continue to acquire a fingerprint image by using a sensor.
  • the liquid After the fingerprint sensor starts to heat up, the liquid will evaporate and the fingerprint image can be acquired again.
  • Step 205 Determine whether the resolution of the fingerprint image reaches a preset standard. If yes, go to step 210; otherwise, go to step 206.
  • Step 206 Determine whether the fingerprint sensor has stopped heating up at present. If yes, go back to step 204; otherwise, go to step 207.
  • Step 204 is performed to continue acquiring the fingerprint image.
  • Step 207 Control the fingerprint sensor to continue to heat up, and determine a change trend of the sharpness of the fingerprint image acquired within the preset time period, and perform step 208.
  • the preset duration can be adjusted according to actual usage. For example, it can be set to 2 seconds or longer.
  • Step 208 Determine whether to stop heating according to the change trend. If yes, go to step 209; otherwise, go back to step 204.
  • the temperature rise is stopped.
  • the sharpness is close to the preset standard, the temperature rise can be stopped, and the residual temperature is used to quickly evaporate the liquid, so that the definition reaches the preset standard.
  • the preset range can be adjusted according to the actual application. For example, the resolution is measured by the variance value of the gray values of all the pixels in the fingerprint image.
  • the preset standard is reached, and the preset range may be 0 to A-a (where A is greater than a, The specific value of a can be adjusted according to the actual application situation. In other words, when the variance value is greater than a, the temperature rise can be stopped.
  • the temperature rise is stopped.
  • the change trend of sharpness is slower and slower, the definition is approaching the preset standard, and the change range is less than a certain value, and the value can be determined as the preset change value.
  • the residual temperature can be used to quickly evaporate the liquid, so that the definition reaches the preset standard.
  • Step 209 Control the fingerprint sensor to stop heating up, and return to step 204.
  • it may stop increasing the power of the fingerprint sensor or stop heating the fingerprint sensor.
  • Step 210 The fingerprint image with the resolution reaching the preset standard is used as the fingerprint image to be identified, and the image to be identified is compared with the preset fingerprint template, and whether the fingerprint recognition is successful is determined according to the comparison result.
  • the fingerprint sensor may be further controlled to stop heating up.
  • the method for acquiring the fingerprint image to be recognized according to the second embodiment of the present invention on the basis of the first embodiment, after controlling the temperature of the fingerprint sensor to start heating, determining the change trend of the sharpness of the fingerprint image acquired within the preset time length, and according to The change trend judges whether to control the fingerprint sensor to stop heating up, and can save system power consumption and improve user experience on the basis of obtaining the clear image of the fingerprint to be recognized.
  • FIG. 3 is a structural block diagram of an apparatus for acquiring a fingerprint image to be recognized according to Embodiment 3 of the present invention.
  • the device may be implemented by software and/or hardware, and is generally integrated in the mobile device, and the fingerprint image to be identified may be acquired by executing an acquisition method of the fingerprint image to be identified.
  • the device includes a fingerprint image acquiring module 301, a sharpness determining module 302, a temperature rising control module 303, and a fingerprint image determining module 304 to be identified.
  • the fingerprint image obtaining module 301 is configured to acquire a fingerprint image by using a fingerprint sensor when a fingerprint recognition event is detected.
  • the definition determining module 302 is configured to determine whether the definition of the fingerprint image reaches a preset standard.
  • the temperature increase control module 303 is configured to control the temperature rise of the fingerprint sensor when it is determined that the resolution of the fingerprint image does not reach a preset standard.
  • the to-be-identified fingerprint image determining module 304 is configured to continue to acquire a fingerprint image by the fingerprint sensor when the fingerprint sensor is heated, until the fingerprint image whose resolution reaches the preset standard is obtained, and the clear The fingerprint image of the preset standard is obtained as the fingerprint image to be recognized.
  • the definition determining module 302 may be specifically configured to: calculate an average value of gray values of all pixels in the fingerprint image, when the average value is less than a preset average value, Determining that the sharpness of the fingerprint image does not reach a preset standard; or calculating a variance value of the gray value of all the pixel points in the fingerprint image, when the variance value is less than the preset variance value, determining the The sharpness of the fingerprint image does not reach the preset standard.
  • the definition determining module 302 may be further configured to: calculate an average value and a variance value of gray values of all pixel points in the fingerprint image, when the average value is less than a pre- Determining that the sharpness of the fingerprint image does not reach a preset criterion when the average value and the variance value are less than a preset variance value; or when the average value is greater than a preset average value and the variance value is less than a preset value When the variance value is set, it is determined that the definition of the fingerprint image does not reach the preset standard.
  • the temperature increase control module 303 can be specifically configured to: Increasing the power of the fingerprint sensor to heat the fingerprint sensor; or controlling a heating device corresponding to the fingerprint sensor to heat the fingerprint sensor to heat the fingerprint sensor.
  • increasing the power of the fingerprint sensor can be by increasing the current value or gain value of the fingerprint sensor.
  • the heating device may specifically be an electric heating device, such as a heating wire, a hot plate, a heating cable, an electric heating coil, etc., and may be disposed at one side or around the fingerprint sensor.
  • the temperature increase control module 303 may include: a change trend determination unit and a temperature increase stop unit.
  • the change trend determining unit is configured to determine a change trend of the sharpness of the fingerprint image acquired within the preset time period while controlling the temperature rise of the fingerprint sensor; and the temperature increase stop unit is configured to determine whether to stop according to the change trend Warm up.
  • the temperature increase stop unit may be specifically configured to: when the change trend is always constant, stop the temperature rise; or, when the change trend is to rise to the preset standard When the preset range is different, the temperature rise is stopped; or when the change trend is that the change range is smaller than the preset change value, the temperature rise is stopped.
  • the device may further include: a fingerprint identification module, configured to compare the image to be identified with a preset fingerprint template, and determine whether the fingerprint identification is successful according to the comparison result.
  • a fingerprint identification module configured to compare the image to be identified with a preset fingerprint template, and determine whether the fingerprint identification is successful according to the comparison result.
  • the fourth embodiment provides a mobile terminal, which includes the acquiring device of the fingerprint image to be identified according to the embodiment of the present invention, and can obtain the fingerprint image to be recognized by executing the acquiring method of the fingerprint image to be recognized.
  • the mobile terminal in this embodiment may be a terminal such as a mobile phone, a smart watch, a tablet computer, and a notebook computer configured with a fingerprint sensor.
  • the fingerprint sensor is coupled to the acquiring device of the fingerprint image to be identified.
  • the mobile terminal When the user uses the mobile terminal in this embodiment to perform terminal unlocking, application unlocking, or fingerprint payment based on fingerprint recognition, if the surface of the finger or the fingerprint sensor is contaminated with liquid, the mobile terminal accelerates the liquid by controlling the temperature of the fingerprint sensor. Evaporation can improve the sharpness of the fingerprint image, thereby improving the success rate of fingerprint recognition and improving the user experience.
  • the above product can perform the method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

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Abstract

一种待识别指纹图像的获取方法,包括:监测到指纹识别事件时,通过指纹传感器获取指纹图像;判断指纹图像的清晰度是否达到预设标准,若否,则控制所述指纹传感器升温,并通过指纹传感器继续获取指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像;此外,还提供相应的待识别指纹图像的获取装置及移动终端。

Description

一种待识别指纹图像的获取方法、装置及移动终端
本申请要求于2015年10月19日提交中国专利局、申请号为2015106811387、发明名称为“一种待识别指纹图像的获取方法、装置及移动终端”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及指纹识别技术领域,尤其涉及一种待识别指纹图像的获取方法、装置及移动终端。
背景技术
指纹等生物特征具有终身不变性、唯一性以及方便性等特性,基于生物特征的鉴权方式安全性能高,目前已得到广泛的应用。
对于手机以及平板电脑等移动终端来说,用户通常会随身携带,且会在其中存储大量的涉及个人隐私及财产安全的数据。因此,移动终端的安全性显得尤为重要。指纹识别技术现已发展成熟,具备较高的稳定性和可靠性,所以,现在的移动终端中通常集成有指纹传感器,用于需要指纹鉴权的场景,如终端解锁、应用程序解锁以及指纹支付等场景。
然而,用户在使用手指进行指纹鉴权时,不可避免地会遇到手指或指纹传感器表面沾有水、汗液或油脂等液体的情况,这时获取到的指纹图像的指纹纹路不清晰,如果将该指纹图像作为待识别指纹图像与指纹模板进行匹配,就会导致指纹匹配出现问题,影响用户的正常使用。
技术问题
本发明的目的是提出一种待识别指纹图像的获取方法、装置及移动终端,以解决现有的指纹识别方案中,在指纹传感器表面沾有液体时,无法获取清晰的待识别指纹图像的问题。
技术解决方案
第一方面,本发明实施例提供了一种待识别指纹图像的获取方法,包括:
监测到指纹识别事件时,通过指纹传感器获取指纹图像;
判断所述指纹图像的清晰度是否达到预设标准,若否,则控制所述指纹传感器升温,并通过所述指纹传感器继续获取指纹图像,直到获取到清晰度达到所述预设标准的指纹图像,将所述清晰度达到所述预设标准的指纹图像作为待识别指纹图像。
第二方面,本发明实施例提供了一种提升指纹识别率的装置,包括:
指纹图像获取模块,用于在监测到指纹识别事件时,通过指纹传感器获取指纹图像;
清晰度判断模块,用于判断所述指纹图像的清晰度是否达到预设标准;
升温控制模块,用于在判断所述指纹图像的清晰度是未达到预设标准时,控制所述指纹传感器升温;
待识别指纹图像确定模块,用于在控制所述指纹传感器升温时,通过所述指纹传感器继续获取指纹图像,直到获取到清晰度达到所述预设标准的指纹图像,将所述清晰度达到所述预设标准的指纹图像作为待识别指纹图像。
第三方面,本发明实施例提供了一种移动终端,包括本发明实施例中的待识别指纹图像的获取装置。
有益效果
本发明实施例中提供的待识别指纹图像的获取方案,在监测到指纹识别事件时,通过指纹传感器获取指纹图像,判断指纹图像的清晰度是否达到预设标准,若否,则控制指纹传感器升温,并通过指纹传感器继续获取指纹图像,直到获取到清晰度达到预设标准的指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像。通过采用上述技术方案,当用户的手指与指纹传感器接触进行指纹输入时,如果手指或指纹传感器表面沾有水、汗液或油脂等液体,那么指纹图像的清晰度会因上述液体的存在而不能达到预设标准,此时,通过控制指纹传感器升温来加快液体蒸发,可提高指纹图像的清晰度,通过指纹传感器继续获取指纹图像,直到获取到清晰度达到预设标准的指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像。随后,可将待识别指纹图像用于指纹识别,从而提高指纹识别的成功率,提升用户体验。
附图说明
图1为本发明实施例一提供的一种待识别指纹图像的获取方法的流程示意图;
图2为本发明实施例二提供的一种待识别指纹图像的获取方法的流程示意图;
图3为本发明实施例三提供的一种待识别指纹图像的获取装置的结构框图。
本发明的最佳实施方式
具体实施方式
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。可以理解的是,此处所描述的具体实施例仅仅用于解释本发明,而非对本发明的限定。另外还需要说明的是,为了便于描述,附图中仅示出了与本发明相关的部分而非全部结构。
在更加详细地讨论示例性实施例之前应当提到的是,一些示例性实施例被描述成作为流程图描绘的处理或方法。虽然流程图将各步骤描述成顺序的处理,但是其中的许多步骤可以被并行地、并发地或者同时实施。此外,各步骤的顺序可以被重新安排。当其操作完成时所述处理可以被终止,但是还可以具有未包括在附图中的附加步骤。所述处理可以对应于方法、函数、规程、子例程、子程序等等。
实施例一
图1为本发明实施例一提供的一种待识别指纹图像的获取方法的流程示意图。该方法可以由待识别指纹图像的获取装置执行,其中该装置可由软件和/或硬件实现,一般可集成在移动终端中。如图1所示,该方法包括:
步骤101、监测到指纹识别事件时,通过指纹传感器获取指纹图像。
示例性的,本实施例中的移动终端具体可为配置有指纹传感器的手机、智能手表、平板电脑和笔记本电脑等设备。本领域技术人员可知,执行本实施例所述方法的装置并不局限于集成于移动终端中,也可集成于配备有指纹传感器的台式计算机或打卡机等其他电子设备中,一般集成于移动终端中是因为所带来的有益效果更加明显,所以本发明实施例仅以集成于移动终端中为例进行说明。
示例性的,所述指纹识别事件具体可为终端解锁、应用程序解锁以及指纹支付等需要进行指纹识别的场景。
示例性的,指纹识别事件发生后,用户会使用手指按压指纹传感器,使指纹传感器获取指纹图像。指纹传感器主要包括光学指纹传感器和半导体指纹传感器。在获取指纹图像时,这些指纹传感器均需依赖于手指表面指纹凹凸不平的纹路。当用户的手指表面沾有水、汗液或油脂等液体,或者指纹传感器表面本身存在液体时,都会影响到获取到的指纹图像的清晰度,从而容易导致指纹识别失败。需要说明的是,由于在获取指纹图像时,手指表面与指纹传感器表面接触,液体存在于手指表面和指纹传感器表面之间,所以可认为液体既存在于手指表面,也存在于指纹传感器表面,为了方便描述,以下仅以手指表面存在液体来代表上述情况。下面以半导体指纹传感器中的电容式指纹传感器为例进行说明,手指表面上的皮肤与指纹传感器会形成电容,由于手指表面凸凹不平,凸点处和凹点处与指纹传感器的实际距离大小就不一样,形成的电容值也就不一样,对采集到的电容值进行处理后得到指纹图像。当手指表面存在液体时,液体会造成采集到的电容值不准确,从而导致指纹图像模糊。
步骤102、判断指纹图像的清晰度是否达到预设标准,若否,则控制指纹传感器升温,并通过指纹传感器继续获取指纹图像,直到获取到清晰度达到预设标准的指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像。
示例性的,本步骤对获取到的指纹图像的图像质量进行衡量,从而判断其清晰度是否达到预设标准。所述预设标准对应于在用户手指正确的情况下,指纹图像可成功通过指纹识别的条件,本领域技术人员可通过实验或理论计算来确定实际使用的指纹传感器对应的预设标准。
判断指纹图像的清晰度是否达到预设标准的方式可以有很多种。常见的指纹传感器获取到的指纹图像为灰度图,下面以指纹图像是灰度图为例列举几种判断方式。例如,可计算指纹图像中所有像素点的灰度值的平均值;当平均值小于预设平均值时,确定指纹图像的清晰度未达到预设标准;因为平均值越小,说明此时的指纹图像越浅,不利于识别。还可计算指纹图像中所有像素点的灰度值的方差值;当方差值小于预设方差值时,确定指纹图像的清晰度未达到预设标准;因为方差值越小,说明不同像素点的灰度值之间的差异越小,指纹图像越模糊,无法辨别出指纹的凸点处和凹点处。还可计算指纹图像中灰度值超过预设灰度值的像素点的个数是否在预设范围之内;若否,则确定指纹图像的清晰度未达到预设标准。进一步的,为了提高判断的准确性,还可同时计算指纹图像中所有像素点的灰度值的平均值和方差值;当平均值很小,方差很小,说明图像接近全白,清晰度未达到预设标准,手指表面很可能有油污;当平均值很大,方差很小,说明图像接近全黑,清晰度未达到预设标准,手指表面很可能有水或汗液;当平均值很大,方差很大,说明这个时候的图像是较好的,便于识别,可认为清晰度已达到预设标准。
示例性的,当判断指纹图像的清晰度未达到预设标准时,说明手指表面可能存在液体,则控制指纹传感器升温。控制指纹传感器升温的方式有很多种,例如,可增大指纹传感器的功率,以使指纹传感器升温;或者控制指纹传感器对应的加热器件对指纹传感器进行加热,以使指纹传感器升温。其中,增大指纹传感器的功率可通过增大指纹传感器的电流值或增益值。所述加热器件具体可为电热器件,如电热线、电热板、电热带以及电加热圈等等,可设置在指纹传感器的一侧或四周。本实施例对加热器件的具体类型、尺寸以及所在位置不作具体限定,本领域技术人员可根据实际应用情况进行选择和设计。在控制指纹传感器升温时,考虑到人对温度比较敏感,可控制指纹传感器的最高温度低于会让用户感到烫手的温度。
控制指纹传感器升温,可加快手指表面的液体蒸发,从而减弱液体对指纹图像清晰度的影响。此时,可通过指纹传感器继续获取指纹图像,直到获取到清晰度达到预设标准的指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像。
在一些实施方式中,指纹传感器开始升温时,考虑到液体可能并未开始蒸发或蒸发量比较小,可在开始升温之后的一定时间间隔之后(如1秒)再继续获取指纹图像。获取指纹图像的频率不作具体限定,示例性的,可设置为2次每秒。每次获取完指纹图像时,判断本次获取的指纹图像的清晰度是否达到预设标准,若未达到,则继续获取指纹图像;若已达到,则将本次指纹图像作为待识别指纹图像,并停止获取指纹图像。
本发明实施例一提供的待识别指纹图像的获取方法,在监测到指纹识别事件时,通过指纹传感器获取指纹图像,判断指纹图像的清晰度是否达到预设标准,若否,则控制指纹传感器升温,并通过指纹传感器继续获取指纹图像,直到获取到清晰度达到预设标准的指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像。通过采用上述技术方案,当用户的手指与指纹传感器接触进行指纹输入时,如果手指或指纹传感器表面沾有水、汗液或油脂等液体,那么指纹图像的清晰度会因上述液体的存在而不能达到预设标准,此时,通过控制指纹传感器升温来加快液体蒸发,可提高指纹图像的清晰度,通过指纹传感器继续获取指纹图像,直到获取到清晰度达到预设标准的指纹图像,将清晰度达到预设标准的指纹图像作为待识别指纹图像。随后,可将待识别指纹图像用于指纹识别,从而提高指纹识别的成功率,提升用户体验。
实施例二
图2为本发明实施例二提供的一种待识别指纹图像的获取方法的流程示意图。本实施例以上述实施例为基础对控制指纹传感器升温的过程进行优化。
相应的,本实施例的方法包括如下步骤:
步骤201、监测到指纹识别事件时,通过指纹传感器获取指纹图像。
步骤202、判断指纹图像的清晰度是否达到预设标准。若是,则执行步骤210;否则,执行步骤203。
示例性的,如果用户手指未沾有液体,那么首次获取的指纹图像的清晰度一般会达到预设标准,此时便可执行步骤210;即将首次获取的指纹图像作为待识别指纹图像并进行后续的指纹识别相关操作,具体的识别过程可与现有识别过程相同,在此不作赘述。若首次获取的指纹图像的清晰度未达到预设标准,则执行步骤203;即控制指纹传感器开始升温。
步骤203、控制指纹传感器开始升温。
示例性的,可开始增大指纹传感器的功率,或者开始对指纹传感器进行加热。
步骤204、通过传感器继续获取指纹图像。
在指纹传感器开始升温之后,液体会加快蒸发,可再次获取指纹图像。
步骤205、判断本次指纹图像的清晰度是否达到预设标准。若是,则执行步骤210;否则,执行步骤206。
步骤206、判断指纹传感器当前是否已停止升温。若是,则返回执行步骤204;否则,执行步骤207。
示例性的,首次执行本步骤时,指纹传感器一般未停止升温;在第二次以及更多次执行本步骤时,很可能已经符合停止升温的条件,指纹传感器停止升温,此时,可直接返回执行步骤204来继续获取指纹图像。
步骤207、控制指纹传感器继续升温,并确定在预设时长内获取的指纹图像的清晰度的变化趋势,执行步骤208。
示例性的,所述预设时长可根据实际使用情况进行调整。例如,可设置为2秒或者更长。
步骤208、根据变化趋势确定是否停止升温。若是,则执行步骤209;否则,返回执行步骤204。
根据变化趋势确定是否停止升温可以有多种实现方式,以下列举其中的三种方式:
1、当变化趋势为始终保持不变时,停止升温。清晰度的变化趋势为始终保持不变,说明温度升高对清晰度没有影响,造成清晰度达不到预设标准的原因可能不是手指表面存在液体,所以可停止升温。
2、当变化趋势为上升至距离预设标准相差预设范围时,停止升温。当清晰度接近预设标准时,可停止升温,依靠余温来使液体快速蒸发,从而使清晰度达到预设标准。其中,预设范围可根据实际应用情况来调整。例如,以指纹图像中所有像素点的灰度值的方差值来衡量清晰度,方差值大于A时,说明达到预设标准,预设范围可为0到A-a(其中,A大于a, a的具体值可根据实际应用情况来调整),换句话说,当方差值大于a时,可停止升温。
3、当变化趋势为变化幅度小于预设变化值时,停止升温。当清晰度的变化趋势为变化越来越慢时,说明清晰度正在接近预设标准,其变化幅度会小于一定的值,可将该值确定为预设变化值。停止加热后,可依靠余温来使液体快速蒸发,从而使清晰度达到预设标准。
步骤209、控制指纹传感器停止升温,返回执行步骤204。
示例性的,可停止增大指纹传感器的功率,或者停止为指纹传感器加热。
步骤210、将清晰度达到预设标准的指纹图像作为待识别指纹图像,将待识别图像与预设指纹模板进行比对,根据比对结果确定指纹识别是否成功。
示例性的,如果在获得待识别指纹图像之后,检测到控制指纹传感器未停止升温,还可进一步控制指纹传感器停止升温。
本发明实施例二提供的待识别指纹图像的获取方法,在实施例一的基础上,在控制指纹传感器开始升温后,确定在预设时长内获取的指纹图像的清晰度的变化趋势,并根据变化趋势判断是否控制指纹传感器停止升温,可在达到获取清晰的待识别指纹图像目的的基础上,节省系统功耗,提升用户体验。
实施例三
图3为本发明实施例三提供的一种待识别指纹图像的获取装置的结构框图。该装置可由软件和/或硬件实现,一般集成在移动设备中,可通过执行待识别指纹图像的获取方法来获取待识别指纹图像。如图3所示,该装置包括指纹图像获取模块301、清晰度判断模块302、升温控制模块303和待识别指纹图像确定模块304。
其中,所述指纹图像获取模块301,用于在监测到指纹识别事件时,通过指纹传感器获取指纹图像。
所述清晰度判断模块302,用于判断所述指纹图像的清晰度是否达到预设标准。
所述升温控制模块303,用于在判断所述指纹图像的清晰度是未达到预设标准时,控制所述指纹传感器升温。
所述待识别指纹图像确定模块304,用于在控制所述指纹传感器升温时,通过所述指纹传感器继续获取指纹图像,直到获取到清晰度达到所述预设标准的指纹图像,将所述清晰度达到所述预设标准的指纹图像作为待识别指纹图像。
在上述实施例的基础上,所述清晰度判断模块302,可具体用于:计算所述指纹图像中所有像素点的灰度值的平均值,当所述平均值小于预设平均值时,确定所述指纹图像的清晰度未达到预设标准;或者,计算所述指纹图像中所有像素点的灰度值的方差值,当所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准。
在上述实施例的基础上,所述清晰度判断模块302,还可具体用于:计算所述指纹图像中所有像素点的灰度值的平均值和方差值,当所述平均值小于预设平均值以及所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准;或者当所述平均值大于预设平均值以及所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准。
在上述实施例的基础上,所述升温控制模块303,可具体用于: 增大所述指纹传感器的功率,以使所述指纹传感器升温;或者,控制所述指纹传感器对应的加热器件对所述指纹传感器进行加热,以使所述指纹传感器升温。示例性的,增大指纹传感器的功率可通过增大指纹传感器的电流值或增益值。所述加热器件具体可为电热器件,如电热线、电热板、电热带以及电加热圈等等,可设置在指纹传感器的一侧或四周。在上述实施例的基础上,所述升温控制模块303可包括:变化趋势确定单元和升温停止单元。其中,变化趋势确定单元,用于在控制所述指纹传感器升温的同时,确定在预设时长内获取的指纹图像的清晰度的变化趋势;升温停止单元,用于根据所述变化趋势确定是否停止升温。
在上述实施例的基础上,所述升温停止单元,可具体用于:当所述变化趋势为始终保持不变时,停止升温;或者,当所述变化趋势为上升至距离所述预设标准相差预设范围时,停止升温;或者,当所述变化趋势为变化幅度小于预设变化值时,停止升温。
在上述实施例的基础上,该装置还可包括:指纹识别模块,用于将所述待识别图像与预设指纹模板进行比对,根据比对结果确定指纹识别是否成功。
实施例四
本实施例四提供了一种移动终端,该移动终端包括本发明实施例中所述的待识别指纹图像的获取装置,可通过执行待识别指纹图像的获取方法来获取待识别指纹图像。
示例性的,本实施例中的移动终端具体可为配置有指纹传感器的手机、智能手表、平板电脑和笔记本电脑等终端。其中,所述指纹传感器与所述待识别指纹图像的获取装置耦合。
用户在使用本实施例中的移动终端进行基于指纹识别的终端解锁、应用程序解锁或指纹支付等动作时,如果手指或指纹传感器表面沾有液体,移动终端就会通过控制指纹传感器升温来加快液体蒸发,可提高指纹图像的清晰度,从而提高指纹识别的成功率,提升用户体验。
上述产品可执行本发明任意实施例所提供的方法,具备执行方法相应的功能模块和有益效果。未在本实施例中详尽描述的技术细节,可参见本发明任意实施例所提供的方法。
注意,上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解,本发明不限于这里所述的特定实施例,对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此,虽然通过以上实施例对本发明进行了较为详细的说明,但是本发明不仅仅限于以上实施例,在不脱离本发明构思的情况下,还可以包括更多其他等效实施例,而本发明的范围由所附的权利要求范围决定。

Claims (20)

  1. 一种待识别指纹图像的获取方法,其包括:
    监测到指纹识别事件时,通过指纹传感器获取指纹图像;
    判断所述指纹图像的清晰度是否达到预设标准,若否,则控制所述指纹传感器升温,并通过所述指纹传感器继续获取指纹图像,直到获取到清晰度达到所述预设标准的指纹图像,将所述清晰度达到所述预设标准的指纹图像作为待识别指纹图像。
  2. 根据权利要求1所述的方法,其中所述判断所述指纹图像的清晰度是否达到预设标准,包括:
    计算所述指纹图像中所有像素点的灰度值的平均值,当所述平均值小于预设平均值时,确定所述指纹图像的清晰度未达到预设标准;或者,
    计算所述指纹图像中所有像素点的灰度值的方差值,当所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准。
  3. 根据权利要求1所述的方法,其中所述判断所述指纹图像的清晰度是否达到预设标准,包括:
    计算所述指纹图像中所有像素点的灰度值的平均值和方差值,当所述平均值小于预设平均值以及所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准;或者
    当所述平均值大于预设平均值以及所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准。
  4. 根据权利要求1所述的方法,其中所述控制所述指纹传感器升温,包括:
    增大所述指纹传感器的功率,以使所述指纹传感器升温;或者
    控制所述指纹传感器对应的加热器件对所述指纹传感器进行加热,以使所述指纹传感器升温。
  5. 根据权利要求4所述的方法,其中所述增大所述指纹传感器的功率,以使所述指纹传感器升温,包括:
    通过增大所述指纹传感器的电流值或增益值,以增大所述指纹传感器的功率,以使所述指纹传感器升温。
  6. 根据权利要求4所述的方法,其中所述加热器件包括电热器件,所述电热器件设置在所述指纹传感器的一侧或四周。
  7. 根据权利要求1所述的方法,其中在控制所述指纹传感器升温的同时,还包括:
    确定在预设时长内获取的指纹图像的清晰度的变化趋势;
    根据所述变化趋势确定是否停止升温。
  8. 根据权利要求7所述的方法,其中所述根据所述变化趋势确定是否停止升温,包括:
    当所述变化趋势为始终保持不变时,停止升温;或者
    当所述变化趋势为上升至距离所述预设标准相差预设范围时,停止升温;或者
    当所述变化趋势为变化幅度小于预设变化值时,停止升温。
  9. 根据权利要求1所述的方法,其中在将所述清晰度达到所述预设标准的指纹图像作为待识别指纹图像之后,还包括:
    将所述待识别图像与预设指纹模板进行比对,根据比对结果确定指纹识别是否成功。
  10. 一种待识别指纹图像的获取装置,其包括:
    指纹图像获取模块,用于在监测到指纹识别事件时,通过指纹传感器获取指纹图像;
    清晰度判断模块,用于判断所述指纹图像的清晰度是否达到预设标准;
    升温控制模块,用于在判断所述指纹图像的清晰度是未达到预设标准时,控制所述指纹传感器升温;
    待识别指纹图像确定模块,用于在控制所述指纹传感器升温时,通过所述指纹传感器继续获取指纹图像,直到获取到清晰度达到所述预设标准的指纹图像,将所述清晰度达到所述预设标准的指纹图像作为待识别指纹图像。
  11. 根据权利要求10所述的装置,其中所述清晰度判断模块,具体用于:
    计算所述指纹图像中所有像素点的灰度值的平均值,当所述平均值小于预设平均值时,确定所述指纹图像的清晰度未达到预设标准;或者,
    计算所述指纹图像中所有像素点的灰度值的方差值,当所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准。
  12. 根据权利要求10所述的装置,其中所述清晰度判断模块,具体用于:
    计算所述指纹图像中所有像素点的灰度值的平均值和方差值,当所述平均值小于预设平均值以及所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准;或者
    当所述平均值大于预设平均值以及所述方差值小于预设方差值时,确定所述指纹图像的清晰度未达到预设标准。
  13. 根据权利要求10所述的装置,其中所述升温控制模块,具体用于:
    增大所述指纹传感器的功率,以使所述指纹传感器升温;或者
    控制所述指纹传感器对应的加热器件对所述指纹传感器进行加热,以使所述指纹传感器升温。
  14. 根据权利要求13所述的装置,其中所述升温控制模块,具体用于:
    通过增大所述指纹传感器的电流值或增益值,以增大所述指纹传感器的功率,以使所述指纹传感器升温。
  15. 根据权利要求13所述的装置,其中所述加热器件包括电热器件,所述电热器件设置在所述指纹传感器的一侧或四周。
  16. 根据权利要求10所述的装置,其中所述升温控制模块包括:
    变化趋势确定单元,用于在控制所述指纹传感器升温的同时,确定在预设时长内获取的指纹图像的清晰度的变化趋势;
    升温停止单元,用于根据所述变化趋势确定是否停止升温。
  17. 根据权利要求16所述的装置,其中所述升温停止单元,具体用于:
    当所述变化趋势为始终保持不变时,停止升温;或者
    当所述变化趋势为上升至距离所述预设标准相差预设范围时,停止升温;或者
    当所述变化趋势为变化幅度小于预设变化值时,停止升温。
  18. 根据权利要求10所述的装置,其中还包括:
    指纹识别模块,用于将所述待识别图像与预设指纹模板进行比对,根据比对结果确定指纹识别是否成功。
  19. 一种移动终端,其包括权利要求10-18任一项所述的待识别指纹图像的获取装置。
  20. 根据权利要求19所述的移动终端,还包括指纹传感器,其中,所述指纹传感器与所述待识别指纹图像的获取装置耦合。
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