WO2016168982A1 - 一种设置指纹识别器中断阈值的方法、装置和终端设备 - Google Patents

一种设置指纹识别器中断阈值的方法、装置和终端设备 Download PDF

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Publication number
WO2016168982A1
WO2016168982A1 PCT/CN2015/077049 CN2015077049W WO2016168982A1 WO 2016168982 A1 WO2016168982 A1 WO 2016168982A1 CN 2015077049 W CN2015077049 W CN 2015077049W WO 2016168982 A1 WO2016168982 A1 WO 2016168982A1
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Prior art keywords
wake
threshold
area
fingerprint
fingerprint identifier
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PCT/CN2015/077049
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English (en)
French (fr)
Inventor
李丹洪
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2017531678A priority Critical patent/JP6448795B2/ja
Priority to US15/527,273 priority patent/US10235548B2/en
Priority to PCT/CN2015/077049 priority patent/WO2016168982A1/zh
Priority to EP15889471.7A priority patent/EP3232312B1/en
Priority to KR1020177016585A priority patent/KR20170085105A/ko
Priority to CN201580004129.2A priority patent/CN106662970B/zh
Publication of WO2016168982A1 publication Critical patent/WO2016168982A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/24—Handling requests for interconnection or transfer for access to input/output bus using interrupt
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/96—Management of image or video recognition tasks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • 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
    • G06V40/1347—Preprocessing; Feature extraction
    • 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
    • G06V40/1365—Matching; Classification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems

Definitions

  • the invention relates to a fingerprint identification technology, in particular to a method, a device and a terminal device for setting a fingerprint identifier interrupt threshold.
  • the fingerprint identification scheme commonly used on terminal devices can be divided into active and passive.
  • the passive fingerprint identification scheme is the central processing unit (English: Central Processing Unit, CPU for short).
  • the fingerprint image is obtained through the continuous polling of the CPU and it is verified whether the fingerprint image matches the fingerprint in the fingerprint library; and the active fingerprint recognition scheme is performed by the fingerprint after the finger touches the wake-up area on the fingerprint recognizer.
  • the recognizer generates an interrupt signal to actively wake up the CPU to acquire a fingerprint image, wherein the wake-up area is used to detect whether the fingerprint recognizer is touched.
  • the active fingerprint recognition scheme greatly reduces the CPU workload, but it also brings the following troubles: How much interrupt threshold should be set for the fingerprint reader to ensure that the interrupt is not triggered or not The problem that triggered the interrupt.
  • the current practice in the industry is to manually adjust the parameters for the fingerprint reader in advance, which is the security value obtained in the production verification.
  • the embodiment of the invention provides a method, a device and a terminal device for setting a fingerprint identifier interrupt threshold, which can be used to solve the problem that the interrupt threshold adjusted by the fingerprint recognizer in advance can not be adapted to different weather conditions and hardware environments. A problem that applies to all users.
  • the present invention provides a method for setting a fingerprint identifier interrupt threshold, comprising:
  • the wake-up area is an area for detecting whether the fingerprint identifier is touched;
  • an interruption threshold of the fingerprint identifier to generate an interrupt signal, where the interrupt threshold is used to instruct the fingerprint identifier to generate an interrupt signal to wake up the CPU of the terminal device;
  • the security value is used to prevent the fingerprint reader from erroneously triggering an interrupt signal to wake up the CPU.
  • the determining, by the first threshold and the preset security value, the interruption threshold of the fingerprint identifier to generate an interrupt signal includes:
  • the first threshold is used as an interruption threshold of the fingerprint identifier to generate an interrupt signal
  • the security value is used as an interruption threshold of the fingerprint identifier to generate an interrupt signal.
  • acquiring the noise floor of the wake-up area includes:
  • the M is an integer greater than 1.
  • the bottom noise of the obtained wake-up area is consistent with Formula:
  • a n represents the noise floor of the wake-up area
  • a i represents a pixel value of the i-th local area in the wake-up area
  • i is an integer not less than 1 and not greater than n
  • n represents the wake-up area
  • the number of local regions, n is an integer greater than zero.
  • the security value is 80
  • the security The balance is 30.
  • the present invention provides a fingerprint identification apparatus, including:
  • a first acquiring unit configured to acquire a bottom noise of a wakeup area on the fingerprint identifier in the terminal device, where the wakeup area is an area for detecting whether the fingerprint identifier is touched;
  • a second acquiring unit configured to add the bottom noise to a preset safety margin to obtain a first threshold
  • a determining unit configured to determine, according to the first threshold and the preset security value, an interruption threshold of the fingerprint identifier generating an interrupt signal, where the interrupt threshold is used to instruct the fingerprint identifier to generate an interrupt signal to wake up the terminal a central processing unit CPU of the device; the security value is used to prevent the fingerprint reader from erroneously triggering an interrupt signal to wake up the CPU.
  • the determining unit is specifically configured to:
  • the first threshold is used as an interruption threshold of the fingerprint identifier to generate an interrupt signal
  • the security value is used as an interruption threshold of the fingerprint identifier to generate an interrupt signal.
  • the first acquiring unit is specifically configured to:
  • the M is an integer greater than 1.
  • the bottom noise of the obtained wake-up area is consistent with Formula:
  • a n represents the noise floor of the wake-up area
  • a i represents a pixel value of the i-th local area in the wake-up area
  • i is an integer not less than 1 and not greater than n
  • n represents the wake-up area
  • the number of local regions, n is an integer greater than zero.
  • the security value is 80
  • the security The balance is 30.
  • the present invention provides a terminal device, including:
  • the fingerprint identifier is configured to generate an interrupt signal to wake up the CPU
  • the memory is configured to store a software program and a module
  • the CPU is configured to run a software program and a module stored in the memory, and perform the following operations: acquiring a noise floor of the wake-up area on the fingerprint identifier, where the wake-up area is an area for detecting whether the fingerprint identifier is touched; Adding the noise floor to a preset safety margin to obtain a first threshold; determining, according to the first threshold and the preset safety value, an interruption threshold of the fingerprint identifier to generate an interrupt signal, where the interrupt threshold is used
  • the fingerprint identifier is instructed to generate an interrupt signal to wake up the CPU; the security value is used by the fingerprint recognizer to falsely trigger an interrupt signal to wake up the CPU.
  • the CPU when determining, by the first threshold and the preset security value, the fingerprint identifier generates an interruption threshold of the interrupt signal, the CPU Specifically used for:
  • the first threshold is used as an interruption threshold of the fingerprint identifier to generate an interrupt signal
  • the security value is used as an interruption threshold of the fingerprint identifier to generate an interrupt signal.
  • the CPU when acquiring the noise floor of the wake-up area, is specifically configured to:
  • the M is an integer greater than 1.
  • the bottom noise of the obtained wake-up area is consistent with Formula:
  • a n represents the noise floor of the wake-up area
  • a i represents a pixel value of the i-th local area in the wake-up area
  • i is an integer not less than 1 and not greater than n
  • n represents the wake-up area
  • the number of local regions, n is an integer greater than zero.
  • the security value is 80
  • the safety margin is 30.
  • the present invention provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions that, when executed by a portable electronic device comprising a plurality of applications
  • the portable electronic device performs the method of any one of the first to fourth possible implementations of the first aspect and the first aspect.
  • the solution provided by the invention obtains an optimal interruption threshold by collecting the noise floor of the fingerprint identifier in real time, so that the dynamic interruption threshold of the fingerprint identifier can adapt to different weather conditions and hardware environments at any time, thereby improving the fingerprint identifier to different users.
  • the fingerprint identification efficiency and recognition accuracy is obtained by collecting the noise floor of the fingerprint identifier in real time, so that the dynamic interruption threshold of the fingerprint identifier can adapt to different weather conditions and hardware environments at any time, thereby improving the fingerprint identifier to different users.
  • FIG. 1 is a flowchart of a method for setting a fingerprint identifier interrupt threshold according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a fingerprint identifier of the model FPC1020 according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a method for setting a fingerprint identifier interrupt threshold value according to an embodiment of the present invention. Flowchart of the FPC1020 fingerprint reader;
  • FIG. 4 is a schematic structural diagram of a fingerprint identification apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
  • the embodiment of the invention provides a method, a device and a terminal device for setting a fingerprint recognizer interruption threshold, and obtaining an optimal interruption threshold by collecting the noise of the fingerprint identifier in real time, so that the dynamic interruption threshold of the fingerprint identifier can adapt to different times at any time.
  • the weather conditions and the hardware environment further improve the recognition efficiency and recognition accuracy of fingerprint readers for different users.
  • an embodiment of the present invention provides a method for setting a fingerprint identifier interrupt threshold.
  • the implementation process of the method is as follows:
  • Step 101 Acquire a noise floor of a wakeup area on the fingerprint identifier in the terminal device, where the wakeup area is an area that detects whether the fingerprint identifier is touched.
  • a fingerprint reader is a fingerprint recognition chip, which can be understood as a processor with an identification area that can be used to capture a fingerprint image.
  • an area that can be used to capture a fingerprint image on the recognition area and can be used to detect whether the recognition area is touched in real time is called an awake area.
  • the wake-up area may further comprise a plurality of partial areas, each of which is a pixel point, and the shape of the wake-up area is determined by the chip design side, and may be a square, a circle, a ring, or the like.
  • the noise floor of the wake-up area is different.
  • the noise floor of the wake-up area in high-humidity environment is high.
  • Obtaining the noise floor of the wake-up area is to obtain the pixel value of the wake-up area when no object touches the wake-up area, and the bottom noise of the obtained wake-up area conforms to the following formula:
  • a n represents the noise floor of the wake-up area
  • a i represents a pixel value of the i-th local area in the wake-up area
  • i is an integer not less than 1 and not greater than n
  • n represents the wake-up area
  • the number of local regions, n is an integer greater than zero.
  • the bottom noise of each wake-up area may be separately acquired, and then the bottom noise of the obtained one of the M bottom noises is obtained as a The noise floor of the M wake-up regions; the M is an integer greater than one.
  • any one of the wake-up regions determines the pixel value obtained by digitizing the electrical quantity (such as capacitance, light intensity, sound volume, etc.) generated by the touch. If the set interrupt threshold is exceeded, the fingerprint reader can successfully trigger the interrupt signal to wake up the CPU. In order to prevent the fingerprint recognizer from erroneously triggering the interrupt signal, only the maximum noise of the plurality of noises corresponding to the plurality of wake regions may be selected as the noise floor of each wake region.
  • Step 102 Add the bottom noise to a preset safety margin to obtain a first threshold.
  • Step 103 Determine, according to the first threshold value and a preset security value, an interruption threshold of the fingerprint identifier generating an interrupt signal, where the interruption threshold is used to instruct the fingerprint identifier to generate an interrupt signal to wake up the terminal device.
  • the security value is used to prevent the fingerprint recognizer from erroneously triggering an interrupt signal to wake up the CPU.
  • the embodiment may write the interrupt threshold to the fingerprint identifier.
  • the interrupt signal is sent to the interrupt signal.
  • the CPU of the terminal device acquires the fingerprint image captured by the fingerprint recognizer when the finger touches the wake-up area from the fingerprint recognizer, and matches the fingerprint image with the fingerprint in the fingerprint database. If the matching is successful, the fingerprint verification is completed. After the fingerprint identification is successfully matched, the user can perform a fingerprint recognition operation such as unlocking the screen or fingerprint payment.
  • the process of determining, by the fingerprint identifier, the interruption threshold of the interrupt signal by the fingerprint identifier is as follows: if the first threshold is less than a preset security value, the first threshold is used as the fingerprint identifier An interrupt threshold for generating an interrupt signal; if the first threshold is greater than the safe value, the security value is used as an interrupt threshold for the fingerprint recognizer to generate an interrupt signal.
  • the first threshold is equal to the security value, the first threshold or the security value may be used as an interruption threshold of the fingerprint identifier to generate an interrupt signal.
  • the first threshold is generally less than or equal to the security value. If the first threshold is selected as the interruption threshold of the fingerprint identifier, the pixel falling between the first threshold and the security value may be made. The value can also trigger the fingerprint recognizer to generate an interrupt signal, thereby enhancing the recognition range of the fingerprint recognizer.
  • the first threshold may be considered as an inappropriate value, for example, when an object touches the wake-up area when acquiring the noise floor of the wake-up area, the acquisition will result in acquisition.
  • the bottom noise of the wake-up area is too large, thereby causing the first threshold to be greater than the security value, and for example, when the fingerprint identifier is damaged, the first threshold may be greater than the security value.
  • the preset threshold value is selected as the interrupt threshold of the fingerprint recognizer.
  • the safety value and the safety margin may both be system parameters, wherein the safety value is a value that ensures that the fingerprint identifier does not falsely trigger the interrupt signal; the safety margin is to ensure the noise floor of the wake-up area After the sum of the safety margins is used as the interrupt threshold, the fingerprint recognizer does not falsely trigger a value of the interrupt signal. For example, when the security value of a fingerprint reader is 90 and the safety margin is 40, if the measured noise floor is 30, since the sum of the noise floor and the safety margin is less than the safety value, 70 can be used as the fingerprint.
  • the interrupt threshold of the identifier before the noise floor expires, as long as the pixel value generated by the object touching the fingerprint recognizer is greater than 70, then the fingerprint recognizer considers that the wake-up area is touched and generates an interrupt signal to wake up the CPU for fingerprint recognition.
  • the fingerprint recognizer thinks that the wake-up area is touched and does not wake up the CPU, thus avoiding an object such as a key unintentionally hanging over the wake-up area of the fingerprint recognizer, causing the CPU to be Wake up situation.
  • Both the safety value and the safety margin can be obtained by actual measurement.
  • the actual measurement may be that a large number of terminal device samples are put into the thermostat, and the cycle test of high temperature, high humidity and low temperature and low humidity is performed, and a test is obtained which enables the fingerprint recognizer on the terminal device to automatically trigger the value of the interrupt signal.
  • the embodiment of the present invention finds that the security value can be set to 80 and the safety margin is set to 30 by a plurality of simulation tests.
  • the fixed interrupt threshold cannot be guaranteed.
  • the fingerprint reader recognizes the accuracy of the fingerprint, for example, the same interruption threshold In a high-humidity environment, the normal operation of the fingerprint reader can be ensured, but in a low-humidity environment, the fingerprint identifier can be difficult to be triggered.
  • the embodiment of the present invention can be used in the fingerprint identifier through step 101.
  • the interruption threshold determines the interruption threshold to perform fingerprint recognition operations such as unlocking screen or fingerprint payment, or after each set period of time, repeating steps 101-103 to determine a new interruption threshold for subsequent fingerprints according to current weather conditions and hardware environment
  • the recognizer generates a judgment basis for the interrupt signal.
  • the fingerprint identifier of the model FPC1020 uses two 8*8 pixel area as the wake-up area, and the wake-up area and other recognition areas can be used to capture the fingerprint image, but The wake-only area can be used to detect if the fingerprint recognizer is touched.
  • the method for applying the technical solution of the present invention to the fingerprint identifier is as follows:
  • Step 301 Read pixel values of two wake-up areas on the fingerprint identifier, and calculate bottom noises of the two wake-up areas as A1 and A2 according to the read pixel values.
  • the noise floor of each wake-up area can be calculated by the following formula:
  • a i represents the pixel value of the i-th local area in the wake-up area.
  • Step 302 Compare A1 and A2, and take the larger one to get A3.
  • Step 303 Add A3 to the preset safety margin Y to obtain A4.
  • Step 304 Determine whether A4 is less than the preset security value S. If yes, go to step 305. Otherwise, go to step 306.
  • Step 305 Notifying A4 to the fingerprint identifier as an interruption threshold of the fingerprint recognizer generating an interrupt signal.
  • Step 306 Notifying S of the interruption threshold of the interrupt signal generated by the fingerprint identifier to the fingerprint recognition Device.
  • Step 307 Wait for the fingerprint recognizer to generate an interrupt signal to wake up the CPU of the terminal device, and return to step 301.
  • an embodiment of the present invention provides a fingerprint identification apparatus for implementing a method for setting a fingerprint identifier interrupt threshold shown in FIG. 1 of the present invention.
  • the apparatus includes:
  • the first obtaining unit 401 is configured to acquire a noise floor of the wake-up area on the fingerprint identifier in the terminal device, where the wake-up area is an area that detects whether the fingerprint identifier is touched.
  • the second obtaining unit 402 is configured to add the bottom noise to a preset safety margin to obtain a first threshold.
  • a determining unit 403 configured to determine, according to the first threshold value and a preset security value, an interruption threshold of the fingerprint identifier generating an interrupt signal, where the interrupt threshold is used to instruct the fingerprint identifier to generate an interrupt signal to wake up the The CPU of the terminal device; the security value is used to prevent the fingerprint reader from erroneously triggering an interrupt signal to wake up the CPU.
  • the determining unit 403 uses the first threshold as an interruption threshold of the fingerprint identifier to generate an interrupt signal; if the first threshold is greater than For the security value, the determining unit 403 uses the security value as an interrupt threshold for the fingerprint recognizer to generate an interrupt signal.
  • the first acquiring unit 401 is specifically configured to: if there are M wake-up areas on the fingerprint identifier, respectively acquire bottom noise of each wake-up area, and obtain the obtained M noise floor The largest one of the bottom noises as the noise floor of the M wake-up regions; the M is an integer greater than one.
  • the bottom noise of the obtained wake-up area conforms to the following formula:
  • a n represents the noise floor of the wake-up area
  • a i represents a pixel value of the i-th local area in the wake-up area
  • i is an integer not less than 1 and not greater than n
  • n represents the wake-up area
  • the number of local regions, n is an integer greater than zero.
  • the security value is 80 and the security margin is 30.
  • an embodiment of the present invention further provides a terminal device, where the terminal device includes:
  • Fingerprint identifier 501 Memory 502, and CPU 503, wherein these components communicate over one or more communication buses or signal lines 504.
  • FIG. 5 is only an example of the terminal device, and the actual terminal device may have more or fewer components than those shown in FIG. 5, and two or more components may be combined. Or can have different component configurations.
  • the various components shown in FIG. 5 may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.
  • the terminal device for wake-up of the fingerprint interrupt provided in this embodiment is described in detail below.
  • the fingerprint identifier 501 is configured to generate an interrupt signal to wake up the CPU 503.
  • the memory 502 is configured to store a software program and a module.
  • Memory 502 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
  • the CPU 503 is a control center of the terminal device, and connects various parts of the entire terminal device by using various interfaces and lines for running the software program and the module stored in the memory 502, and performs the following operations:
  • the CPU 503 when determining, according to the first threshold and the preset security value, that the fingerprint identifier generates an interruption threshold of the interrupt signal, if the first threshold is less than a preset security value, the CPU 503 The first threshold is used as an interruption threshold for generating an interrupt signal by the fingerprint identifier; if the first threshold is greater than the security value, the CPU 503 uses the security value as an interrupt for generating an interrupt signal by the fingerprint identifier. Threshold.
  • the CPU 503 when acquiring the noise floor of the awake area, is specifically configured to: if there are M awake areas on the fingerprint identifier 501, respectively acquire the noise floor of each awake area, and obtain the obtained The bottom noise of the M bottom noise is used as the noise floor of the M wake-up regions; the M is an integer greater than 1.
  • the bottom noise of the obtained wake-up area conforms to the following formula:
  • a n represents the noise floor of the wake-up area
  • a i represents a pixel value of the i-th local area in the wake-up area
  • i is an integer not less than 1 and not greater than n
  • n represents the wake-up area
  • the number of local regions, n is an integer greater than zero.
  • the security value is 80 and the security margin is 30.
  • embodiments of the present invention also provide a computer readable storage medium storing one or more programs, the one or more programs including instructions when executed by a portable electronic device including a plurality of applications The portable electronic device is caused to perform a method of setting a fingerprint recognizer interruption threshold according to any of the above cases.
  • the technical solution provided by the embodiment of the present invention obtains an optimal interruption threshold by collecting the noise floor of the fingerprint identifier in real time, so that the dynamic interruption threshold of the fingerprint identifier can adapt to different weather conditions and hardware environments at any time, and further The recognition efficiency and recognition accuracy of fingerprints of different users by the fingerprint recognizer are improved.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

提供一种设置指纹识别器中断阈值的方法、装置和终端设备，提供的动态的中断阈值可以使指纹识别器适应不同的天气条件和硬件环境，提高对不同用户的指纹的识别效率和识别准确率。该方法为：获取终端设备中指纹识别器上的唤醒区域的底噪，唤醒区域为检测指纹识别器是否被碰触的区域；将底噪加上预设的安全余量，得到第一阈值；根据第一阈值和预设的安全值，确定指纹识别器产生中断信号的中断阈值，中断阈值用于指示指纹识别器产生中断信号唤醒终端设备的中央处理器CPU；安全值用于避免指纹识别器误触发中断信号唤醒CPU。

Description

一种设置指纹识别器中断阈值的方法、装置和终端设备 技术领域
本发明涉及一种指纹识别技术，尤其涉及一种设置指纹识别器中断阈值的方法、装置和终端设备。
背景技术
目前终端设备上常用的指纹识别方案可以分为主动式和被动式两种，其中，被动式的指纹识别方案，即是先通过按键唤醒终端设备的中央处理器(英文：Central Processing Unit，简称：CPU)之后，再通过CPU不断的轮询获得指纹图像并验证该指纹图像是否与指纹库中的指纹匹配；而主动式的指纹识别方案，是在手指触碰指纹识别器上的唤醒区域后，由指纹识别器产生中断信号主动唤醒CPU去采集指纹图像，其中，唤醒区域用于检测指纹识别器是否被触碰。主动式的指纹识别方案相对被动式而言，大大降低了CPU的工作负载，但是也带来了以下困扰：需要为指纹识别器设置多大的中断阈值，才能保证既不会误触发中断又不会无法触发中断的问题。
针对上述问题，业界目前的做法是人工提前为指纹识别器调整好参数，这个参数是在生产验证中获得的安全值。
但是由于每个用户的手指产生的电信号的大小可能互不相同，指纹识别器等硬件也无法做到完全一致，且天气环境也在不断变化，所以提前调整好的中断阀值显然无法适用于所有的用户。
发明内容
本发明实施例提供一种设置指纹识别器中断阈值的方法、装置和终端设备，用以解决现有技术中指纹识别器提前调整好的中断阈值无法适应于不同的天气条件、硬件环境导致的不能适用于所有用户的问题。
第一方面，本发明提供了一种设置指纹识别器中断阈值的方法，包括：
获取终端设备中指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；
将所述底噪加上预设的安全余量，得到第一阈值；
根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述终端设备的CPU；所述安全值用于避免所述指纹识别器误触发中断信号唤醒所述CPU。
结合第一方面，在第一方面的第一种可能的实现方式中，所述根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，包括：
若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；
若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，获取唤醒区域的底噪，包括：
若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并
将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
结合第一方面和第一方面的第一种至第二种可能的实现方式中的任意一种，在第一方面的第三种可能的实现方式中，获取到的唤醒区域的底噪符合下述公式：
Figure PCTCN2015077049-appb-000001
其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局 部区域的数量，n为大于0的整数。
结合第一方面和第一方面的第一种至第三种可能的实现方式中的任意一种，在第一方面的第四种可能的实现方式中，所述安全值为80，所述安全余量为30。
第二方面，本发明提供了一种指纹识别装置，包括：
第一获取单元，用于获取终端设备中指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；
第二获取单元，用于将所述底噪加上预设的安全余量，得到第一阈值；
确定单元，用于根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述终端设备的中央处理器CPU；所述安全值用于避免所述指纹识别器误触发中断信号唤醒所述CPU。
结合第二方面，在第二方面的第一种可能的实现方式中，所述确定单元具体用于：
若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；
若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
结合第二方面或第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，所述第一获取单元具体用于：
若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并
将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
结合第二方面和第二方面的第一种至第二种可能的实现方式中的任意一种，在第二方面的第三种可能的实现方式中，获取到的唤醒区域的底噪符合下述公式：
Figure PCTCN2015077049-appb-000002
其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局部区域的数量，n为大于0的整数。
结合第二方面和第二方面的第一种至第三种可能的实现方式中的任意一种，在第二方面的第四种可能的实现方式中，所述安全值为80，所述安全余量为30。
第三方面，本发明提供了一种终端设备，包括：
指纹识别器、存储器和CPU，其中，
所述指纹识别器，用于产生中断信号唤醒所述CPU；
所述存储器，用于存储软件程序以及模块；
所述CPU，用于运行存储在存储器的软件程序以及模块，执行以下操作：获取所述指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；将所述底噪加上预设的安全余量，得到第一阈值；根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述CPU；所述安全值用于所述指纹识别器误触发中断信号唤醒所述CPU。
结合第三方面，在第三方面的第一种可能的实现方式中，在根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值时，所述CPU具体用于：
若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；
若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，在获取唤醒区域的底噪时，所述CPU具体用于：
若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并
将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
结合第三方面和第三方面的第一种至第二种可能的实现方式中的任意一种，在第三方面的第三种可能的实现方式中，获取到的唤醒区域的底噪符合下述公式：
Figure PCTCN2015077049-appb-000003
其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局部区域的数量，n为大于0的整数。
结合第三方面和第三方面的第一种至第三种可能的实现方式中的任意一种，在第三方面的第四种可能的实现方式中，其特征在于，所述安全值为80，所述安全余量为30。
第四方面，本发明提供了一种存储一个或多个程序的计算机可读存储介质，所述一个或多个程序包括指令，所述指令当被包括多个应用程序的便携式电子设备执行时使所述便携式电子设备执行根据第一方面和第一方面的第一种至第四种可能的实现方式中的任意一种实现方式中所述方法。
本发明提供的方案，通过实时采集指纹识别器的底噪获得最佳的中断阈值，使得指纹识别器动态的中断阈值能够随时适应不同的天气条件和硬件环境，进而提高了指纹识别器对不同用户的指纹的识别效率和识别准确率。
附图说明
图1为本发明实施例提供的一种设置指纹识别器中断阈值的方法流程图；
图2为本发明实施例提供的一种型号为FPC1020的指纹识别器的示意图；
图3为本发明实施例中将设置指纹识别器中断阈值的方法应用于型号为 FPC1020的指纹识别器的流程图；
图4为本发明实施例提供的一种指纹识别装置的结构示意图；
图5为本发明实施例提供的一种终端设备的结构示意图。
具体实施方式
本发明实施例提供了一种设置指纹识别器中断阈值的方法、装置和终端设备，通过实时采集指纹识别器的底噪获得最佳的中断阈值，使得指纹识别器动态的中断阈值能够随时适应不同的天气条件和硬件环境，进而提高了指纹识别器对不同用户的指纹的识别效率和识别准确率。
下面结合说明书附图和各实施例对本发明技术方案进行说明。
参阅图1所示，本发明实施例提供了一种设置指纹识别器中断阈值的方法，该方法的实施流程如下：
步骤101：获取终端设备中指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域。
指纹识别器为一种指纹识别芯片，可以理解为一种处理器，其附带了一块可以用于抓取指纹图像的识别区域。特别的，在该识别区域上既可以用于抓取指纹图像、又可以用于实时检测识别区域是否被碰触的区域称为唤醒区域。唤醒区域内又可以包含若干个局部区域，每个局部区域即为一个像素点，唤醒区域的形状由芯片设计方决定，可以是方形、圆形、环形等。
在不同的天气条件(如晴天、下雨等)和硬件环境(如南方、北方等)下，唤醒区域的底噪是不同的，例如，在高湿度环境下的唤醒区域的底噪，要高于低湿度环境下的底噪。获取唤醒区域的底噪即是获取在没有任何物体接触唤醒区域时唤醒区域的像素值，获取到的唤醒区域的底噪符合下述公式：
Figure PCTCN2015077049-appb-000004
其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局 部区域的数量，n为大于0的整数。在指纹芯片设计中，在不影响功耗等其他因素的条件下，n越大，唤醒区域的识别能力和识别准确性越强。
可选地，若所述指纹识别器上有M个唤醒区域，则可以先分别获取每个唤醒区域的底噪，然后将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
由于当所述指纹识别器上拥有多个唤醒区域时，只要任一个唤醒区域判定其因被触碰而产生的电学量(如电容量、光强度或声量等)经数字化处理后得到的像素值超过设定的中断阈值，即可令指纹识别器成功触发中断信号唤醒CPU。为了防止指纹识别器误触发中断信号，可以只选择这多个唤醒区域对应的多个底噪中的最大底噪作为每个唤醒区域的底噪。
步骤102：将所述底噪加上预设的安全余量，得到第一阈值。
步骤103：根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述终端设备的CPU；所述安全值用于避免所述指纹识别器误触发中断信号唤醒所述CPU。
本发明实施例在确定中断阈值后，可以将该中断阈值写入指纹识别器，指纹识别器在判断出某一次手指触碰唤醒区域得到的像素值大于该中断阈值时，则产生中断信号发送给终端设备的CPU，CPU在接收到该中断信号后，从指纹识别器获取这一次手指触碰唤醒区域时指纹识别器抓取到的指纹图像，并将该指纹图像与指纹库中的指纹进行匹配，匹配成功则完成指纹验证。指纹识别匹配成功之后，用户可以进行解锁屏幕或指纹支付等指纹识别操作。
可选地，本发明实施例确定所述指纹识别器产生中断信号的中断阈值的过程如下：若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。当所述第一阈值等于所述安全值时，所述第一阈值或者所述安全值均可作为所述指纹识别器产生中断信号的中断阈值。
一般情况下，所述第一阈值通常小于或者等于所述安全值，此时若选择所述第一阈值作为指纹识别器的中断阈值，则可以使落在第一阈值到安全值之间的像素值也能正常触发指纹识别器产生中断信号，从而增强了指纹识别器的识别范围。而当所述第一阈值大于所述安全值时，可以认为此时的所述第一阈值为不合适的值，例如当获取唤醒区域的底噪时有物体接触唤醒区域，便将造成获取到的唤醒区域的底噪过大，进而导致所述第一阈值大于所述安全值，又例如当指纹识别器损坏时也有可能导致所述第一阈值大于所述安全值，此时应该摒弃所述第一阈值而选择预设的所述安全值作为指纹识别器的中断阈值。
所述安全值和安全余量均可以为系统参数，其中，所述安全值是保证指纹识别器不会误触发中断信号的一个值；所述安全余量是保证将唤醒区域的底噪与所述安全余量的和值作为中断阈值后指纹识别器不会误触发中断信号的一个值。例如，当某指纹识别器的安全值为90，安全余量为40，若某次测得的底噪为30，由于该底噪与安全余量之和小于安全值，所以可以将70作为指纹识别器的中断阈值，在该底噪过期之前，只要物体触碰指纹识别器产生的像素值大于70，则此时指纹识别器认为唤醒区域被触碰进而产生中断信号唤醒CPU进行指纹识别，若物体触碰指纹识别器产生的像素值小于70，则此时指纹识别器认为唤醒区域被触碰不会唤醒CPU，这样避免了如钥匙等物体无意挂蹭过指纹识别器的唤醒区域导致CPU被唤醒的情况。所述安全值和安全余量均可以通过实测得到。所述实测可以是将大量的终端设备样品放入温箱，通过高温高湿和低温低湿的循环测试，得到能够使终端设备上的指纹识别器不会自动触发中断信号的数值的试验。
较佳地，本发明实施例通过多次模拟试验发现，可以将所述安全值置为80，将所述安全余量置为30。
由于不同的天气条件(如晴天、下雨等)和硬件环境(如南方、北方等)会影响唤醒区域的底噪以及手指触碰唤醒区域产生的像素值，因此固定不变的中断阈值无法保证指纹识别器识别指纹的准确性，例如，相同的中断阈值 在湿度高的环境下能够保证指纹识别器的正常工作，但在湿度低的环境下有可能造成指纹识别器的不易触发，为了克服这个问题，本发明实施例可以在指纹识别器使用通过步骤101-103确定的中断阈值进行解锁屏幕或指纹支付等指纹识别操作，或每经过设定的时长后，便重复步骤101-103，根据当前的天气条件和硬件环境确定新的中断阈值用于以后指纹识别器产生中断信号的判断依据。
为了更清楚地说明本发明的技术方案，下面通过一个实施例对上述流程做进一步的说明，需要说明的是，此实施例仅仅是本发明的一个实施例，不构成对本发明的限定。
如图2所示，为型号为FPC1020的指纹识别器，该型号的指纹识别器通过两个8*8的像素点区域作为唤醒区域，唤醒区域和其他识别区域可以用于抓取指纹图像，但仅唤醒区域可以用于检测指纹识别器是否被触碰。如图3所示，将本发明的技术方案应用于该指纹识别器的方法流程如下：
步骤301：读取指纹识别器上的两个唤醒区域的像素值，并根据读取的像素值计算两个唤醒区域的底噪分别为A1和A2。
具体可以通过以下公式计算每个唤醒区域的底噪：
Figure PCTCN2015077049-appb-000005
其中，ai表示唤醒区域内第i个局部区域的像素值。
步骤302：比较A1和A2，取其中的较大者得到A3。
步骤303：将A3加上预设的安全余量Y，得到A4。
步骤304：判断A4是否小于预设的安全值S，若是，则执行步骤305，否则，执行步骤306。
步骤305：将A4作为指纹识别器产生中断信号的中断阈值通知给指纹识别器。
步骤306：将S作为指纹识别器产生中断信号的中断阈值通知给指纹识别 器。
步骤307：等待指纹识别器产生中断信号唤醒终端设备的CPU，并返回步骤301。
参阅图4所示，本发明实施例提供了一种指纹识别装置，用于实现本发明图1所示的一种设置指纹识别器中断阈值的方法，该装置包括：
第一获取单元401，用于获取终端设备中指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域。
第二获取单元402，用于将所述底噪加上预设的安全余量，得到第一阈值，。
确定单元403，用于根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述终端设备的CPU；所述安全值用于避免所述指纹识别器误触发中断信号唤醒所述CPU。
可选地，若所述第一阈值小于预设的安全值，则所述确定单元403将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；若所述第一阈值大于所述安全值，则所述确定单元403将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
可选地，所述第一获取单元401具体用于：若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
可选地，获取到的唤醒区域的底噪符合下述公式：
Figure PCTCN2015077049-appb-000006
其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局部区域的数量，n为大于0的整数。
可选地，所述安全值为80，所述安全余量为30。
参阅图5所示，本发明实施例还提供了一种终端设备，所述终端设备包括：
指纹识别器501、存储器502和CPU503，其中，这些部件通过一个或多个通信总线或信号线504来通信。
需要说明的是，图5所示仅仅是终端设备的一个范例，并且实际的终端设备可以具有比图5中所示出的更多的或者更少的部件，可以组合两个或更多的部件，或者可以具有不同的部件配置。图5中所示出的各种部件可以在包括一个或多个信号处理和/或专用集成电路在内的硬件、软件、或硬件和软件的组合中实现。
下面就本实施例提供的用于指纹中断唤醒的终端设备进行详细的描述。
所述指纹识别器501，用于产生中断信号唤醒所述CPU503。
所述存储器502，用于存储软件程序以及模块。存储器502可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
所述CPU503，是终端设备的控制中心，利用各种接口和线路连接整个终端设备的各个部分，用于运行存储在存储器502的软件程序以及模块，执行以下操作：
获取所述指纹识别器501上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；将所述底噪加上预设的安全余量，得到第一阈值；根据所述第一阈值和预设的安全值，确定所述指纹识别器501产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述CPU；所述安全值用于所述指纹识别器误触发中断信号唤醒所述CPU。
可选地，在根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值时，若所述第一阈值小于预设的安全值，则所述CPU503将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；若所述第一阈值大于所述安全值，则所述CPU503将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
可选地，在获取唤醒区域的底噪时，所述CPU503具体用于：若所述指纹识别器501上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
可选地，获取到的唤醒区域的底噪符合下述公式：
Figure PCTCN2015077049-appb-000007
其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局部区域的数量，n为大于0的整数。
可选地，所述安全值为80，所述安全余量为30。
此外，本发明实施例还提供了一种存储一个或多个程序的计算机可读存储介质，所述一个或多个程序包括指令，所述指令当被包括多个应用程序的便携式电子设备执行时使所述便携式电子设备执行根据上述任意一种情况下的设置指纹识别器中断阈值的方法。
综上所述，本发明实施例提供的技术方案，通过实时采集指纹识别器的底噪获得最佳的中断阈值，使得指纹识别器动态的中断阈值能够随时适应不同的天气条件和硬件环境，进而提高了指纹识别器对不同用户的指纹的识别效率和识别准确率。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程 和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (16)

  1. 一种设置指纹识别器中断阈值的方法，其特征在于，包括：
    获取终端设备中指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；
    将所述底噪加上预设的安全余量，得到第一阈值；
    根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述终端设备的中央处理器CPU；所述安全值用于避免所述指纹识别器误触发中断信号唤醒所述CPU。
  2. 如权利要求1所述的方法，其特征在于，所述根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，包括：
    若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；
    若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
  3. 如权利要求1或2所述的方法，其特征在于，获取唤醒区域的底噪，包括：
    若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并
    将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
  4. 如权利要求1-3中任意一项所述的方法，其特征在于，获取到的唤醒区域的底噪符合下述公式：
    Figure PCTCN2015077049-appb-100001
    其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局 部区域的数量，n为大于0的整数。
  5. 如权利要求1-4中任意一项所述的方法，其特征在于，所述安全值为80，所述安全余量为30。
  6. 一种指纹识别装置，其特征在于，包括：
    第一获取单元，用于获取终端设备中指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；
    第二获取单元，用于将所述底噪加上预设的安全余量，得到第一阈值；
    确定单元，用于根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述终端设备的中央处理器CPU；所述安全值用于避免所述指纹识别器误触发中断信号唤醒所述CPU。
  7. 如权利要求6所述的装置，其特征在于，所述确定单元具体用于：
    若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；
    若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
  8. 如权利要求6或7所述的装置，其特征在于，所述第一获取单元具体用于：
    若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并
    将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
  9. 如权利要求6-8中任意一项所述的装置，其特征在于，获取到的唤醒区域的底噪符合下述公式：
    Figure PCTCN2015077049-appb-100002
    其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区 域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局部区域的数量，n为大于0的整数。
  10. 如权利要求6-9中任意一项所述的装置，其特征在于，所述安全值为80，所述安全余量为30。
  11. 一种终端设备，其特征在于，包括：
    指纹识别器、存储器和中央处理器CPU，其中，
    所述指纹识别器，用于产生中断信号唤醒所述CPU；
    所述存储器，用于存储软件程序以及模块；
    所述CPU，用于运行存储在存储器的软件程序以及模块，执行以下操作：获取所述指纹识别器上的唤醒区域的底噪，所述唤醒区域为检测指纹识别器是否被触碰的区域；将所述底噪加上预设的安全余量，得到第一阈值；根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值，所述中断阈值用于指示所述指纹识别器产生中断信号唤醒所述CPU；所述安全值用于所述指纹识别器误触发中断信号唤醒所述CPU。
  12. 如权利要求11所述的终端设备，其特征在于，在根据所述第一阈值和预设的安全值，确定所述指纹识别器产生中断信号的中断阈值时，所述CPU具体用于：
    若所述第一阈值小于预设的安全值，则将所述第一阈值作为所述指纹识别器产生中断信号的中断阈值；
    若所述第一阈值大于所述安全值，则将所述安全值作为所述指纹识别器产生中断信号的中断阈值。
  13. 如权利要求11或12所述的终端设备，其特征在于，在获取唤醒区域的底噪时，所述CPU具体用于：
    若所述指纹识别器上有M个唤醒区域，则分别获取每个唤醒区域的底噪，并
    将获取到的所述M个底噪中最大的一个底噪，作为所述M个唤醒区域的底噪；所述M为大于1的整数。
  14. 如权利要求11-13中任意一项所述的终端设备，其特征在于，获取到的唤醒区域的底噪符合下述公式：
    Figure PCTCN2015077049-appb-100003
    其中，An表示所述唤醒区域的底噪，ai表示所述唤醒区域内第i个局部区域的像素值，i为不小于1且不大于n的整数，n表示所述唤醒区域包含的局部区域的数量，n为大于0的整数。
  15. 如权利要求11-14中任意一项所述的终端设备，其特征在于，所述安全值为80，所述安全余量为30。
  16. 一种存储一个或多个程序的计算机可读存储介质，其特征在于，所述一个或多个程序包括指令，所述指令当被包括多个应用程序的便携式电子设备执行时使所述便携式电子设备执行根据权利要求1至5任一项所述方法。
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