CN106203301A - Terminal unit, fingerprint identification method and device - Google Patents

Abstract

The disclosure discloses a terminal device, a fingerprint identification method and a device, and belongs to the field of intelligent terminals. The terminal device includes: a processing chip, a fingerprint sensor and a temperature collection component, the processing chip is electrically connected to the fingerprint sensor and the temperature collection component respectively; the processing chip is used to collect fingerprint signals through the fingerprint sensor, and collect temperature signals through the temperature collection component, Determine the compensation coefficient corresponding to the temperature signal, compensate the fingerprint signal according to the compensation coefficient, and perform fingerprint identification according to the compensated fingerprint signal; solve the problem that the processing chip needs to continuously adjust hardware parameters and The algorithm is processed and the fingerprint signal is collected multiple times for identification, which leads to the problem that the whole process of fingerprint identification is longer; it achieves the effect of reducing the number of fingerprint signal acquisition, simplifying the process of fingerprint identification, and speeding up the fingerprint identification speed.

Description

Terminal equipment, fingerprint identification method and device

technical field

The present disclosure relates to the field of intelligent terminals, and in particular to a terminal device, a fingerprint identification method and a device.

Background technique

With the development of fingerprint identification technology, terminal devices such as smart phones, tablet computers and attendance machines can be embedded with fingerprint sensors, and terminal devices collect user's fingerprint signals through fingerprint sensors, and then identify the fingerprint signals to realize screen unlocking. , account login and fingerprint time attendance and other functions.

Since the ambient temperature will affect the collection result of the fingerprint signal, for the same finger, the fingerprint signals collected by the terminal device at different temperatures may be different. In related technologies, in order to avoid the problem of errors in the identification of collected fingerprint signals due to ambient temperature, the terminal device needs to continuously adjust hardware parameters and processing algorithms and collect fingerprints multiple times during the process of identifying fingerprint signals. The signal is identified until a fingerprint image with better image quality is generated. The whole process of fingerprint identification is longer and the response speed is slower.

Contents of the invention

In order to solve the problems of relatively long fingerprint identification process and slow response speed of terminal equipment in the related art, the present disclosure provides a terminal equipment, a fingerprint identification method and a device. Described technical scheme is as follows:

According to the first aspect of the embodiments of the present disclosure, there is provided a terminal device, the terminal device includes: a processing chip, a fingerprint sensor, and a temperature collection component, and the processing chip is electrically connected to the fingerprint sensor and the temperature collection component respectively;

The processing chip is used to collect fingerprint signals through the fingerprint sensor;

The processing chip is also used to collect temperature signals through the temperature collection component;

The processing chip is also used to determine the compensation coefficient corresponding to the temperature signal;

The processing chip is also used for compensating the fingerprint signal according to the compensation coefficient, and performing fingerprint recognition according to the compensated fingerprint signal.

Optionally, the terminal device further includes: a front-end amplifier electrically connected to the fingerprint sensor, and an analog-to-digital converter electrically connected to the front-end amplifier and the processing chip;

The compensation coefficient includes at least one of the parameter index of the front-end amplifier and the parameter index of the analog-to-digital converter, the parameter index of the front-end amplifier includes at least the gain value of the front-end amplifier, and the parameter index of the analog-to-digital converter includes the dynamic range of the analog-to-digital converter , at least one of response frequency, response speed and resolution.

Optionally, the processing chip is also used for:

When the compensation coefficient includes the parameter index of the front-end amplifier, the fingerprint signal is amplified by the front-end amplifier with the compensation coefficient, and the amplified fingerprint signal is converted by analog-to-digital conversion through an analog-to-digital converter to obtain a compensated fingerprint signal;

When the compensation coefficient includes the parameter index of the analog-to-digital converter, the fingerprint signal is amplified by the front-end amplifier, and the amplified fingerprint signal is converted by analog-to-digital conversion by the analog-to-digital converter with the compensation coefficient to obtain the compensated fingerprint signal.

Optionally, the compensation coefficient includes at least one of a filter function and a signal magnification, the filter function is a function for filtering the fingerprint signal, and the signal magnification is a magnification when the fingerprint signal is amplified.

Optionally, the processing chip is also used for:

When the compensation coefficient includes a filter function, the fingerprint signal is filtered by the filter function to obtain a compensated fingerprint signal;

When the compensation coefficient includes a signal amplification factor, the fingerprint signal is amplified according to the signal amplification factor to obtain a compensated fingerprint signal.

The processing chip is also used to inquire about the preset corresponding relationship, and determine the compensation coefficient corresponding to the temperature signal according to the preset corresponding relationship. The preset corresponding relationship includes the corresponding relationship between the temperature signal and the compensation coefficient.

According to the second aspect of the embodiments of the present disclosure, a fingerprint identification method is provided, which is used in a terminal device. The terminal device includes: a processing chip, a fingerprint sensor, and a temperature collection component, and the processing chip is electrically connected to the fingerprint sensor and the temperature collection component respectively. sexual connection, including:

Collect fingerprint signals through the fingerprint sensor;

Acquire temperature signals through temperature acquisition components;

Determine the compensation coefficient corresponding to the temperature signal;

The fingerprint signal is compensated according to the compensation coefficient, and the fingerprint identification is performed according to the compensated fingerprint signal.

Optionally, the terminal device also includes: a front-end amplifier electrically connected to the fingerprint sensor, and an analog-to-digital converter electrically connected to the front-end amplifier and the processing chip; the compensation coefficient includes the parameter index of the front-end amplifier and the analog-to-digital converter At least one of the parameter indexes of the front-end amplifier, the parameter index of the front-end amplifier includes at least the gain value of the front-end amplifier, and the parameter index of the analog-to-digital converter includes at least one of the dynamic range, response frequency, response speed and resolution of the analog-to-digital converter kind.

Optionally, the fingerprint signal is compensated according to the compensation coefficient, including:

When the compensation coefficient includes the parameter index of the front-end amplifier, the fingerprint signal is amplified by the front-end amplifier with the compensation coefficient, and the amplified fingerprint signal is converted by analog-to-digital conversion through an analog-to-digital converter to obtain a compensated fingerprint signal;

When the compensation coefficient includes the parameter index of the analog-to-digital converter, the fingerprint signal is amplified by the front-end amplifier, and the amplified fingerprint signal is converted by analog-to-digital conversion by the analog-to-digital converter with the compensation coefficient to obtain the compensated fingerprint signal.

Optionally, the compensation coefficient includes at least one of a filter function and a signal magnification, the filter function is a function for filtering the fingerprint signal, and the signal magnification is a magnification when the fingerprint signal is amplified.

Optionally, the fingerprint signal is compensated according to the compensation coefficient, including:

When the compensation coefficient includes a filter function, the fingerprint signal is filtered by the filter function to obtain a compensated fingerprint signal;

When the compensation coefficient includes a signal amplification factor, the fingerprint signal is amplified according to the signal amplification factor to obtain a compensated fingerprint signal.

Optionally, determine the compensation coefficient corresponding to the temperature signal, including:

The preset corresponding relationship is queried, and the compensation coefficient corresponding to the temperature signal is determined according to the preset corresponding relationship. The preset corresponding relationship includes a corresponding relationship between the temperature signal and the compensation coefficient.

According to a third aspect of an embodiment of the present disclosure, there is provided a fingerprint recognition device, the device comprising:

processor;

memory for storing processor-executable instructions;

where the processor is configured as:

Collect fingerprint signals through the fingerprint sensor;

Acquire temperature signals through temperature acquisition components;

Determine the compensation coefficient corresponding to the temperature signal;

The fingerprint signal is compensated according to the compensation coefficient, and the fingerprint identification is performed according to the compensated fingerprint signal.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

By electrically connecting the processing chip with the fingerprint sensor and the temperature acquisition component, the processing chip can collect the fingerprint signal through the fingerprint sensor, and the temperature signal through the temperature acquisition component, and the processing chip determines the compensation coefficient corresponding to the temperature signal, and according to the determined compensation coefficient Compensate the fingerprint signal, and perform fingerprint identification according to the compensated fingerprint signal; solve the problem that in order to avoid the identification error of the fingerprint signal caused by the ambient temperature, the processing chip needs to continuously adjust the hardware parameters and processing algorithm and collect the fingerprint signal multiple times for identification. The problem that the entire fingerprint identification process is relatively long; since the processing chip can directly determine the compensation coefficient that matches the current temperature according to the current temperature signal, the fingerprint signal is compensated according to the determined compensation coefficient, and the fingerprint signal is compensated according to the compensated fingerprint signal. Fingerprint identification can reduce the number of fingerprint signal collection, simplify the fingerprint identification process, and speed up the fingerprint identification speed.

It is to be understood that both the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram of a terminal device according to an exemplary embodiment;

Fig. 2 is a schematic structural diagram of a temperature acquisition circuit shown according to another exemplary embodiment;

Fig. 3 is a schematic structural diagram of a terminal device according to another exemplary embodiment;

Fig. 4 is a schematic structural diagram of a terminal device according to another exemplary embodiment;

Fig. 5 is a flowchart of a fingerprint recognition method according to an exemplary embodiment;

Fig. 6 is a flowchart of a fingerprint identification method according to another exemplary embodiment.

detailed description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

FIG. 1 is a schematic structural diagram of a terminal device according to an exemplary embodiment. As shown in FIG. 1 , the terminal device 10 includes: a fingerprint sensor 110 , a temperature collection component 120 and a processing chip 130 .

The processing chip 130 is electrically connected to the fingerprint sensor 110 and the temperature collection component 120 respectively.

The processing chip 130 is configured to collect fingerprint signals through the fingerprint sensor 110 .

The processing chip 130 is also used for collecting temperature signals through the temperature collecting component 120 .

The processing chip 130 is further configured to determine a compensation coefficient corresponding to the temperature signal.

The processing chip 130 is further configured to compensate the fingerprint signal according to the compensation coefficient, and generate a fingerprint image according to the compensated fingerprint signal.

To sum up, in the terminal device provided by the embodiments of the present disclosure, by electrically connecting the processing chip with the fingerprint sensor and the temperature collection component, the processing chip can collect fingerprint signals through the fingerprint sensor, and collect temperature signals through the temperature collection component, and the processing chip can determine The compensation coefficient corresponding to the temperature signal, and the fingerprint signal is compensated according to the determined compensation coefficient, and the fingerprint recognition is performed according to the compensated fingerprint signal; it solves the problem that the processing chip needs to be continuously adjusted in order to avoid the recognition error of the fingerprint signal caused by the ambient temperature Hardware parameters and processing algorithms and fingerprint signals are collected multiple times for identification, resulting in a long process of fingerprint identification; since the processing chip can directly determine the compensation coefficient that matches the current temperature according to the current temperature signal, the compensation coefficient obtained according to the determination The fingerprint signal is compensated, and the fingerprint recognition is carried out according to the compensated fingerprint signal, which achieves the effects of reducing the number of fingerprint signal collection, simplifying the process of fingerprint recognition, and speeding up the fingerprint recognition speed.

Please refer to the schematic structural diagram of the terminal device shown in FIG. 1 , the terminal device 10 includes: a fingerprint sensor 110 , a temperature collection component 120 and a processing chip 130 .

Terminal equipment 10 is such as mobile phone, panel computer, attendance machine, intelligent lockset, wearable device, e-book reader, MP3 (Moving Picture Experts Group Audio Layer III, moving picture expert compression standard audio level 3) player, MP4 (Moving Picture Experts Group Audio Layer Ⅳ, dynamic image expert compression standard audio layer 4) Smart terminals such as players, the terminal device 10 has the functions of fingerprint collection and fingerprint identification.

The processing chip 130 is configured to collect fingerprint signals through the fingerprint sensor 110 . Optionally, the fingerprint sensor 110 is an optical fingerprint sensor, a semiconductor capacitive sensor, a semiconductor pressure sensor, an ultrasonic sensor, an RF (Radio Frequency, radio frequency) sensor, and the like. The fingerprint sensor 110 may be integrated into a button of a terminal device such as a mobile phone or a tablet computer, and when a user's finger touches the button, the fingerprint sensor 110 collects a fingerprint signal. After the fingerprint sensor 110 collects the fingerprint signal, it sends the fingerprint signal to the processing chip 130 .

The processing chip 130 is also used for collecting temperature signals through the temperature collecting component 120 . Optionally, the temperature acquisition component 120 is a temperature sensor such as a thermocouple, a thermistor, and a bimetallic strip, or a heat-sensitive material. For example, the temperature acquisition component 120 can be integrated in a terminal device such as a mobile phone or a tablet computer. The temperature sensor in the button, or a layer of heat-sensitive material arranged on the surface of the button, when the user's finger touches the button, the temperature collection component 120 collects the temperature signal of the user's finger, and sends the collected temperature signal to the processing Chip 130.

In actual implementation, the acquisition of the temperature signal is realized by connecting the temperature acquisition component 120 to the temperature acquisition circuit. Since the resistance value or other device parameter values of the temperature acquisition component 120 will vary according to the sensed temperature value, and When temperature acquisition assembly 120 is connected in the temperature acquisition circuit, the difference of the device parameter value of temperature acquisition assembly 120 also can make the output signal of temperature acquisition circuit different, so the device parameter value of temperature acquisition assembly 120 and the temperature value of ambient temperature There is a corresponding relationship between the temperature acquisition circuit and the output signal of the temperature acquisition circuit. In this way, the temperature value sensed by the temperature acquisition component 120 can be converted into a temperature signal for output, so as to realize the acquisition of the temperature signal. The collected temperature signal and the temperature There is a correspondence between the values.

The structure of a temperature acquisition circuit in the terminal device 10 can be shown in Figure ₂ , the temperature acquisition component 120 and the fixed resistance R1 are respectively set at the positive and negative input terminals of the differential amplifier 201, and the differential amplifier 201 inputs the positive and negative input terminals The voltage difference of the voltage is amplified and transmitted to the analog-to-digital converter (ADC) 202, and the analog-to-digital converter 202 converts the received amplified voltage difference into a digital signal as a collected temperature signal, when the temperature acquisition component 120 When the resistance value of is changed, the temperature signal output by the analog-to-digital converter 202 also changes. It should be noted that the structure of the temperature acquisition circuit shown in FIG. ₂ is exemplary. In this embodiment, the reference voltage V+ at the positive input terminal, the reference voltage V- at the negative input terminal, and the resistance values _of the fixed resistors R1 and R2 Size is not limited. The schematic structural diagram of the terminal device shown in FIG. 1 does not show the temperature acquisition circuit where the temperature acquisition component 120 is located.

Optionally, the signal output end of the temperature acquisition circuit is electrically connected to the processing chip 130 for sending the temperature signal to the processing chip 130 ; or, the temperature acquisition circuit is integrated in the processing chip 130 .

Optionally, the terminal device shown in FIG. 1 may further include: a front-end amplifier 140 and an analog-to-digital converter 150, and a schematic structural diagram of the terminal device may be as shown in FIG. 3 .

The front-end amplifier 140 is electrically connected to the fingerprint sensor 110 , and the analog-to-digital converter 150 is electrically connected to the front-end amplifier 140 and the processing chip 130 respectively. The front-end amplifier 140 is used to amplify the fingerprint signal collected by the fingerprint sensor 110, and the analog-to-digital converter 150 is used to perform analog-to-digital conversion on the fingerprint signal amplified by the front-end amplifier 140, and send the fingerprint signal after the analog-to-digital conversion to the processing chip 130.

Optionally, the processing chip 130 is a CPU (Central Processing Unit, central processing unit) or a fingerprint identification IC (Integrated Circuit, integrated circuit) of the terminal device 10 . Since the processing capability of the fingerprint recognition IC is generally weak, the processing chip 130 in this embodiment is usually the CPU of the terminal device 10, but in actual implementation, if the processing capability of the fingerprint recognition IC is relatively strong, it can also be made by The fingerprint identification IC is realized as the processing chip 130 in this embodiment. This embodiment takes the processing chip 130 as the CPU of the terminal device 10 as an example.

After receiving the fingerprint signal and the temperature signal, the processing chip 130 determines the compensation coefficient corresponding to the temperature signal. The processing chip 130 pre-stores a preset corresponding relationship, the preset corresponding relationship includes the corresponding relationship between the temperature signal and the compensation coefficient, the processing chip 130 queries the preset corresponding relationship, and determines the compensation coefficient corresponding to the temperature signal according to the preset corresponding relationship , compensate the fingerprint signal according to the compensation coefficient, and perform fingerprint recognition according to the compensated fingerprint signal. In actual implementation, the compensation coefficients are usually matrix coefficients.

Optionally, the processing chip 130 may use at least one of the following two methods to compensate the fingerprint signal according to the content of the compensation coefficient:

In a first possible implementation manner, the compensation coefficient includes at least one of a parameter index of the front-end amplifier 140 and a parameter index of the analog-to-digital converter 150 . The parameter index of the front-end amplifier 140 includes at least the gain value of the front-end amplifier 140 , and the parameter index of the analog-to-digital converter 150 includes at least one of the dynamic range, response frequency, response speed and resolution of the analog-to-digital converter 150 .

When the compensation coefficient includes the parameter index of the front-end amplifier 140, the processing chip 130 is used to amplify the fingerprint signal through the front-end amplifier 140 having the compensation coefficient to obtain the amplified fingerprint signal, and the amplified fingerprint signal is amplified by the analog-to-digital converter 150. The signal is subjected to analog-to-digital conversion to obtain a compensated fingerprint signal.

When the compensation coefficient includes the parameter index of the analog-to-digital converter, the processing chip 130 is used to amplify the fingerprint signal through the front-end amplifier 140 to obtain the amplified fingerprint signal, and the amplified fingerprint signal is amplified by the analog-to-digital converter 150 having the compensation coefficient. The fingerprint signal is subjected to analog-to-digital conversion to obtain a compensated fingerprint signal.

It should be noted that each parameter index of the front-end amplifier 140 and the analog-to-digital converter 150 has a default value, and the parameter indexes not included in the compensation coefficient can keep the default value unchanged.

In an illustrative example, the parameter index of the front-end amplifier 140 is the gain value, the parameter index of the analog-to-digital converter 150 is dynamic range and resolution, and the compensation coefficient includes the gain value of the front-end amplifier 140 and the analog-to-digital converter 150 As an example, assume that the compensation coefficient corresponding to the temperature signal is [10dB, 8bit], then the meaning of the compensation coefficient can be that the gain value of the front-end amplifier is 10dB, and the resolution of the analog-to-digital converter is 8bit, then the processing The chip 130 sets the gain value of the front-end amplifier 140 to 10dB, so that the front-end amplifier 140 amplifies the fingerprint signal according to the gain value; the resolution of the analog-to-digital converter 150 is set to 8bit, while maintaining the dynamics of the analog-to-digital converter 150. The range is the default value, so that the analog-to-digital converter 150 performs analog-to-digital conversion on the amplified fingerprint signal according to the 8-bit resolution and the default dynamic range to obtain the compensated fingerprint signal.

Optionally, the terminal device 10 may further include a filter, which is not shown in FIG. 3 , and the filter is electrically connected to the front-end amplifier 140 and the analog-to-digital converter 150 respectively, and is used to filter out noise signals in the fingerprint signal. Then the compensation coefficient can also include the parameter index of the filter, and the parameter index of the filter includes at least one of the filter response type, center frequency and cut-off frequency, wherein the filter response type includes Butterworth response, Bessel response and cut-off frequency. At least one of Bischoff's responses.

In a second possible implementation manner, the compensation coefficient includes at least one of a filter function and a signal amplification factor, the filter function is a function for filtering the fingerprint signal, and the signal amplification factor is an amplification factor when amplifying the fingerprint signal.

Then, when the compensation coefficient includes a filter function, the processing chip 130 is configured to filter the fingerprint signal through the filter function to obtain a compensated fingerprint signal. In actual implementation, when the compensation coefficient is a filter function, the compensation coefficient is usually a filter operator corresponding to the filter function, and the processing chip 130 obtains the compensated fingerprint signal by convolving the compensation coefficient with the fingerprint signal.

Optionally, the filtering function includes at least one of mean filtering, Gaussian filtering, median filtering, extremum filtering, smoothing filtering and Laplacian sharpening.

When the compensation coefficient includes a signal amplification factor, the processing chip 130 is configured to amplify the fingerprint signal according to the signal amplification factor to obtain a compensated fingerprint signal.

In an illustrative example, the compensation coefficient is the Laplacian Then the compensation coefficient indicates that Laplacian sharpening is performed on the fingerprint signal by the Laplacian operator, and the processing chip 130 convolves the compensation coefficient with the received fingerprint signal to obtain the compensated fingerprint signal.

After the processing chip 130 uses at least one of the above two possible implementations to compensate the fingerprint signal and obtain the compensated fingerprint signal, it can perform fingerprint identification according to the compensated fingerprint signal, including the following steps:

1. The processing chip 130 generates a fingerprint image according to the compensated fingerprint signal, and evaluates the image quality of the fingerprint image. The image quality may include at least one of the gray scale distribution, effective area and offset degree of the fingerprint image.

2. When the image quality of the fingerprint image is less than or equal to a predetermined threshold, the fingerprint signal is collected again, wherein the predetermined threshold can be a system preset value or a user-defined value, which is not limited in this embodiment.

When the terminal device collects the user's fingerprint, if there are impurities such as water droplets and dust on the fingerprint part of the user's finger, or if there is scar or wear on the fingerprint part, the quality of the fingerprint image generated by the terminal device based on the compensated fingerprint signal may still be less than or equal to the predetermined one. Threshold, at this time, the terminal device collects fingerprint signals again. Optionally, when the number of times the terminal device collects fingerprint signals is greater than the predetermined number of times, the terminal device displays a prompt message. The prompt message is used to inform the user that the fingerprint recognition has failed and may prompt the user to replace another finger. The predetermined number of times is a system preset value or is determined by the user User-defined, which is not limited in this embodiment.

3. When the image quality of the fingerprint image is greater than a predetermined threshold, image preprocessing such as image segmentation, image enhancement, image binarization, and image thinning is performed on the fingerprint image.

4. Extracting fingerprint features in the fingerprint image after image preprocessing, where the fingerprint features include at least one of fingerprint orientation, fingerprint breakpoints, and fingerprint intersections.

5. The processing chip 130 is pre-stored with a fingerprint feature library, which includes several fingerprint features. The processing chip 130 matches the extracted fingerprint features with the fingerprint features in the pre-stored fingerprint feature library. When the extracted fingerprint features When the similarity with a fingerprint feature in the fingerprint feature library is greater than the matching threshold, it is determined that the two fingerprint features match, and the two fingerprint features correspond to the same finger of the same user, otherwise it is determined that the two fingerprint signals do not match , so as to realize the identification of the fingerprint signal, wherein, the matching threshold is a system preset value or a user-defined value, which is not limited in this embodiment.

It should be noted that, based on the terminal device shown in FIG. 1 or FIG. 3 , the terminal device 10 may also include a fingerprint identification IC 160, and the structural schematic diagram of the terminal device 10 may be as shown in FIG. 4 (the front end is not shown in FIG. 4 Amplifier 140 and analog-to-digital converter 150), fingerprint identification IC 160 is electrically connected with fingerprint sensor 110 and temperature collection assembly 120, and fingerprint identification IC 160 is electrically connected with processing chip 130, and fingerprint identification IC 160 is used for receiving fingerprint signals and temperature signal, and send the fingerprint signal and the temperature signal to the processing chip 130.

To sum up, in the terminal device provided by the embodiments of the present disclosure, by electrically connecting the processing chip with the fingerprint sensor and the temperature collection component, the processing chip can collect fingerprint signals through the fingerprint sensor, and collect temperature signals through the temperature collection component, and the processing chip can determine The compensation coefficient corresponding to the temperature signal, and the fingerprint signal is compensated according to the determined compensation coefficient, and the fingerprint recognition is performed according to the compensated fingerprint signal; it solves the problem that the processing chip needs to be continuously adjusted in order to avoid the recognition error of the fingerprint signal caused by the ambient temperature Hardware parameters and processing algorithms and fingerprint signals are collected multiple times for identification, resulting in a long process of fingerprint identification; since the processing chip can directly determine the compensation coefficient that matches the current temperature according to the current temperature signal, the compensation coefficient obtained according to the determination The fingerprint signal is compensated, and the fingerprint recognition is carried out according to the compensated fingerprint signal, which achieves the effects of reducing the number of fingerprint signal collection, simplifying the process of fingerprint recognition, and speeding up the fingerprint recognition speed.

In the terminal device provided by the embodiments of the present disclosure, the processing chip directly uses the compensation coefficient that matches the current temperature to compensate the fingerprint signal, and performs fingerprint recognition according to the compensated fingerprint signal, so that the hardware parameters used when compensating the fingerprint signal and The processing algorithms are more reasonable, so that the fingerprint image generated by the compensated fingerprint signal can have better definition and signal-to-noise ratio.

Fig. 5 is a flowchart of a fingerprint identification method according to an exemplary embodiment, the method can be used in the terminal device shown in Fig. 1, and the method includes the following steps:

In step 501, a fingerprint signal is collected by a fingerprint sensor.

In step 502, a temperature signal is collected by a temperature collection component.

It should be noted that there is no specific execution order of step 501 and step 502, and in actual implementation, step 501 and step 502 are usually executed simultaneously.

In step 503, a compensation coefficient corresponding to the temperature signal is determined.

In step 504, the fingerprint signal is compensated according to the compensation coefficient, and fingerprint identification is performed according to the compensated fingerprint signal.

To sum up, in the fingerprint identification method provided by the embodiments of the present disclosure, by electrically connecting the processing chip with the fingerprint sensor and the temperature acquisition component, the processing chip can collect fingerprint signals through the fingerprint sensor, and collect temperature signals through the temperature acquisition component, and the processing chip can Determine the compensation coefficient corresponding to the temperature signal, and compensate the fingerprint signal according to the determined compensation coefficient, and perform fingerprint identification according to the compensated fingerprint signal; solve the problem that the processing chip needs to be continuously processed to avoid the identification error of the fingerprint signal caused by the ambient temperature Adjust hardware parameters and processing algorithms and collect fingerprint signals multiple times for identification, resulting in a longer process of fingerprint identification; since the processing chip can directly determine the compensation coefficient that matches the current temperature according to the current temperature signal, the compensation obtained according to the determination The coefficient compensates the fingerprint signal, and performs fingerprint identification according to the compensated fingerprint signal, which achieves the effect of reducing the number of fingerprint signal collection, simplifying the process of fingerprint identification, and speeding up the fingerprint identification speed.

Fig. 6 is a flow chart of a fingerprint identification method according to another exemplary embodiment, the method can be used in the terminal device shown in Fig. 2, and the method includes the following steps:

In step 601, the processing chip collects fingerprint signals through a fingerprint sensor.

In step 602, the processing chip collects a temperature signal through a temperature collection component.

It should be noted that step 601 and step 602 do not have a specific execution sequence, and in actual implementation, step 601 and step 602 are usually executed simultaneously.

In step 603, the processing chip queries a preset correspondence, and determines a compensation coefficient corresponding to the temperature signal according to the preset correspondence, and the preset correspondence includes a correspondence between the temperature signal and the compensation coefficient.

Optionally, the compensation coefficient includes at least one of the parameter index of the front-end amplifier and the parameter index of the analog-to-digital converter, the parameter index of the front-end amplifier includes at least the gain value of the front-end amplifier, and the parameter index of the analog-to-digital converter includes analog-to-digital conversion At least one of the dynamic range, response frequency, response speed and resolution of the sensor.

In step 604, the processing chip compensates the fingerprint signal according to the compensation coefficient, and performs fingerprint identification according to the compensated fingerprint signal.

When the compensation coefficient includes the parameter index of the front-end amplifier, the processing chip amplifies the fingerprint signal through the front-end amplifier with the compensation coefficient to obtain the amplified fingerprint signal, and performs analog-to-digital conversion on the amplified fingerprint signal through the analog-to-digital converter to obtain the compensation fingerprint signal;

When the compensation coefficient includes the parameter index of the analog-to-digital converter, the processing chip amplifies the fingerprint signal through the front-end amplifier to obtain the amplified fingerprint signal, and performs analog-to-digital conversion on the amplified fingerprint signal through the analog-to-digital converter with compensation coefficient to obtain Compensated fingerprint signal.

Optionally, in the fingerprint identification method based on the above-mentioned FIG. 6 , in the above-mentioned step 603, the compensation coefficient corresponding to the temperature signal determined by the processing chip includes at least one of a filter function and a signal amplification factor, and the filter function is for The function of filtering the fingerprint signal, the signal magnification is the magnification when the fingerprint signal is amplified.

Then the above step 604 can be implemented as:

When the compensation coefficient includes a filter function, the processing chip filters the fingerprint signal through the filter function to obtain the compensated fingerprint signal;

When the compensation coefficient includes the signal amplification factor, the processing chip amplifies the fingerprint signal according to the signal amplification factor to obtain the compensated fingerprint signal.

To sum up, in the fingerprint identification method provided by the embodiments of the present disclosure, by electrically connecting the processing chip with the fingerprint sensor and the temperature acquisition component, the processing chip can collect fingerprint signals through the fingerprint sensor, and collect temperature signals through the temperature acquisition component, and the processing chip can Determine the compensation coefficient corresponding to the temperature signal, and compensate the fingerprint signal according to the determined compensation coefficient, and perform fingerprint identification according to the compensated fingerprint signal; solve the problem that the processing chip needs to be continuously processed to avoid the identification error of the fingerprint signal caused by the ambient temperature Adjust hardware parameters and processing algorithms and collect fingerprint signals multiple times for identification, resulting in a longer process of fingerprint identification; since the processing chip can directly determine the compensation coefficient that matches the current temperature according to the current temperature signal, the compensation obtained according to the determination The coefficient compensates the fingerprint signal, and performs fingerprint identification according to the compensated fingerprint signal, which achieves the effect of reducing the number of fingerprint signal collection, simplifying the process of fingerprint identification, and speeding up the fingerprint identification speed.

The following are device embodiments of the present disclosure, which can be used to implement the method embodiments of the present disclosure. For details not disclosed in the disclosed device embodiments, please refer to the disclosed method embodiments.

An exemplary embodiment of the present disclosure provides a fingerprint identification device capable of implementing the fingerprint identification method provided in the present disclosure, the device comprising: a processor, a memory for storing processor-executable instructions;

where the processor is configured as:

Collect fingerprint signals through the fingerprint sensor;

Acquire temperature signals through temperature acquisition components;

Determine the compensation coefficient corresponding to the temperature signal;

The fingerprint signal is compensated according to the compensation coefficient, and the fingerprint identification is performed according to the compensated fingerprint signal.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It should be understood that the present disclosure is not limited to the precise constructions which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (13)

1. A terminal device, characterized in that the terminal device comprises: a processing chip, a fingerprint sensor, and a temperature collection component, and the processing chip is electrically connected to the fingerprint sensor and the temperature collection component respectively; The processing chip is used to collect fingerprint signals through the fingerprint sensor; The processing chip is also used to collect temperature signals through the temperature collection component; The processing chip is also used to determine a compensation coefficient corresponding to the temperature signal; The processing chip is further configured to compensate the fingerprint signal according to the compensation coefficient, and perform fingerprint identification according to the compensated fingerprint signal. 2. The terminal device according to claim 1, further comprising: a front-end amplifier electrically connected to the fingerprint sensor, and electrically connected to the front-end amplifier and the processing chip the analog-to-digital converter; The compensation coefficient includes at least one of a parameter index of the front-end amplifier and a parameter index of the analog-to-digital converter, the parameter index of the front-end amplifier includes at least a gain value of the front-end amplifier, and the analog-to-digital converter The parameter index of the converter includes at least one of the dynamic range, response frequency, response speed and resolution of the analog-to-digital converter. 3. The terminal device according to claim 2, wherein the processing chip is also used for: When the compensation coefficient includes the parameter index of the front-end amplifier, the fingerprint signal is amplified by the front-end amplifier having the compensation coefficient, and the amplified fingerprint signal is amplified by the analog-to-digital converter. The fingerprint signal after the analog-to-digital conversion is compensated; When the compensation coefficient includes the parameter index of the analog-to-digital converter, the fingerprint signal is amplified by the front-end amplifier, and the amplified fingerprint is amplified by the analog-to-digital converter with the compensation coefficient The signal is subjected to analog-to-digital conversion to obtain the compensated fingerprint signal. 4. The terminal device according to claim 1, characterized in that, The compensation coefficient includes at least one of a filter function and a signal amplification factor, the filter function is a function for filtering the fingerprint signal, and the signal amplification factor is an amplification factor when amplifying the fingerprint signal. 5. The terminal device according to claim 4, wherein the processing chip is also used for: When the compensation coefficient includes the filter function, the fingerprint signal is filtered by the filter function to obtain the compensated fingerprint signal; When the compensation coefficient includes the signal amplification factor, the fingerprint signal is amplified according to the signal amplification factor to obtain the compensated fingerprint signal. 6. The terminal device according to any one of claims 1 to 5, characterized in that, The processing chip is further configured to inquire about a preset corresponding relationship, and determine the compensation coefficient corresponding to the temperature signal according to the preset corresponding relationship, and the preset corresponding relationship includes the correspondence between the temperature signal and the compensation coefficient relation. 7. A fingerprint identification method, characterized in that, the method is used in a terminal device, and the terminal device includes: the processing chip, a fingerprint sensor and a temperature acquisition component, and the processing chip is connected to the fingerprint sensor and the temperature acquisition component respectively. The temperature acquisition component is electrically connected, and the method includes: collecting fingerprint signals through the fingerprint sensor; collecting a temperature signal through the temperature collecting component; determining a compensation coefficient corresponding to the temperature signal; The fingerprint signal is compensated according to the compensation coefficient, and fingerprint identification is performed according to the compensated fingerprint signal. 8. The method according to claim 7, wherein the terminal device further comprises: a front-end amplifier electrically connected to the fingerprint sensor, and a front-end amplifier electrically connected to the processing chip. Analog-to-digital converter; The compensation coefficient includes at least one of a parameter index of the front-end amplifier and a parameter index of the analog-to-digital converter, the parameter index of the front-end amplifier includes at least a gain value of the front-end amplifier, and the analog-to-digital converter The parameter index of the converter includes at least one of the dynamic range, response frequency, response speed and resolution of the analog-to-digital converter. 9. The method according to claim 8, wherein said compensating said fingerprint signal according to said compensation coefficient comprises: When the compensation coefficient includes the parameter index of the front-end amplifier, the fingerprint signal is amplified by the front-end amplifier having the compensation coefficient, and the amplified fingerprint signal is amplified by the analog-to-digital converter. The fingerprint signal after the analog-to-digital conversion is compensated; When the compensation coefficient includes the parameter index of the analog-to-digital converter, the fingerprint signal is amplified by the front-end amplifier, and the amplified fingerprint is amplified by the analog-to-digital converter with the compensation coefficient The signal is subjected to analog-to-digital conversion to obtain the compensated fingerprint signal. 10. The method of claim 7, wherein, The compensation coefficient includes at least one of a filter function and a signal amplification factor, the filter function is a function for filtering the fingerprint signal, and the signal amplification factor is an amplification factor when amplifying the fingerprint signal. 11. The method according to claim 10, wherein said compensating said fingerprint signal according to said compensation coefficient comprises: When the compensation coefficient includes the filter function, the fingerprint signal is filtered by the filter function to obtain the compensated fingerprint signal; When the compensation coefficient includes the signal amplification factor, the fingerprint signal is amplified according to the signal amplification factor to obtain the compensated fingerprint signal. 12. The method according to any one of claims 7 to 11, wherein the determining the compensation coefficient corresponding to the temperature signal comprises: Querying a preset corresponding relationship, and determining the compensation coefficient corresponding to the temperature signal according to the preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the temperature signal and the compensation coefficient. 13. A fingerprint identification device, characterized in that the device comprises: processor; memory for storing said processor-executable instructions; Wherein, the processor is configured as: Collect fingerprint signals through the fingerprint sensor; Acquire temperature signals through temperature acquisition components; determining a compensation coefficient corresponding to the temperature signal; The fingerprint signal is compensated according to the compensation coefficient, and fingerprint identification is performed according to the compensated fingerprint signal.