CN106355144B - Fingerprint image acquisition method and device and mobile terminal - Google Patents

Abstract

The present invention discloses a fingerprint image acquisition method, device and mobile terminal. The method includes: determining a liquid-containing area and a liquid-free area in a finger area; obtaining a corresponding first calibration parameter value according to the liquid-containing area, and obtaining a corresponding second calibration parameter value according to the liquid-free area; and acquiring a fingerprint image of the finger area according to the first calibration parameter value and the second calibration parameter value. The method improves the accuracy of acquiring fingerprint images, improves acquisition efficiency, and improves the accuracy of fingerprint recognition.

Description

Fingerprint image collection method, device and mobile terminal

technical field

The present invention relates to the technical field of mobile terminals, and in particular, to a fingerprint image collection method, device and mobile terminal.

Background technique

With the rapid development of mobile terminal technology and image processing technology, fingerprint identification technology has been applied to many fields as a highly secure identification technology, which not only brings security protection to personal private devices, but also brings convenience to users. convenience. For example, the mobile terminal or the application software or files on the mobile terminal are encrypted or unlocked by the fingerprint identification technology, which brings a good experience to the user.

However, when collecting the user's fingerprint image through the fingerprint module, the user needs to touch the surface of the fingerprint module in the mobile terminal with the user's finger to capture the user's fingerprint information, but inevitably, sometimes the user's finger is wet ( For example, the user's finger is a wet fingerprint, or the user's finger contains liquid, etc.). In the related art, no matter whether the finger is a wet fingerprint or there is liquid on the surface of the finger, after the user's finger touches the fingerprint module, the same calibration parameter value is obtained to collect the fingerprint image, which will reduce the accuracy of the collected fingerprint image and cause fingerprints. The image does not match the registered fingerprint image, which reduces the accuracy of fingerprint recognition.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve one of the above-mentioned technical problems at least to a certain extent.

Therefore, the first objective of the present invention is to provide a method for collecting fingerprint images. The method can improve the accuracy of collecting fingerprint images, improve the collecting efficiency, and improve the accuracy of fingerprint identification.

The second object of the present invention is to provide a fingerprint image collection device.

The third object of the present invention is to provide a mobile terminal.

The fourth object of the present invention is to propose another mobile terminal.

In order to achieve the above purpose, the fingerprint image collection method according to the first aspect of the present invention includes: determining a liquid-containing area and a liquid-free area in a finger area; obtaining a corresponding first calibration parameter value according to the liquid-containing area, and obtain a corresponding second calibration parameter value according to the liquid-free area; and collect a fingerprint image on the finger area according to the first calibration parameter value and the second calibration parameter value.

According to the fingerprint image collection method according to the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area touched on the fingerprint module can be determined, and then the corresponding first calibration parameter value is obtained according to the liquid-containing area, and The corresponding second calibration parameter value is obtained according to the liquid-free region, and finally, the fingerprint image is collected for the finger region according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image collection, when it is determined that the finger area includes liquid-containing areas and liquid-free areas, by adjusting the local gain parameters, different calibration parameters are used for different areas of the finger, and at the same time according to different The calibration parameters are used to collect the corresponding fingerprint areas, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

According to an embodiment of the present invention, the collecting the fingerprint image on the finger region according to the first calibration parameter value and the second calibration parameter value includes: collecting the fingerprint image according to the first calibration parameter value the first fingerprint image of the liquid-containing area, and the second fingerprint image of the liquid-free area is collected according to the second calibration parameter value; the first fingerprint image and the second fingerprint image are synthesized to generate the The fingerprint image of the said finger area.

According to an embodiment of the present invention, the first calibration parameter value includes a first gain value and a first offset value, the second calibration parameter value includes a second gain value and a second offset value, and the first A gain value is greater than the second gain value.

According to an embodiment of the present invention, the method further includes: controlling the temperature of the fingerprint module to remove the liquid in the liquid-containing area; obtaining the corresponding third calibration parameter value according to the finger area after removing the liquid, and The third calibration parameter value is used to collect the fingerprint image of the finger region after removing the liquid.

According to an embodiment of the present invention, the controlling the temperature of the fingerprint module includes: increasing the power of the fingerprint module to increase the temperature of the fingerprint module; or, controlling the pair of heating devices corresponding to the fingerprint module to The fingerprint module is heated to heat up the fingerprint module.

In order to achieve the above purpose, the fingerprint image collection device according to the embodiment of the second aspect of the present invention includes: a determination module for determining a liquid-containing area and a liquid-free area in the finger area; an acquisition module for determining the liquid-containing area according to the liquid-containing area The corresponding first calibration parameter value is obtained from the area, and the corresponding second calibration parameter value is obtained according to the liquid-free area; the acquisition module is configured to The finger region is used to collect fingerprint images.

According to the fingerprint image collection device of the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined by the determination module, and the acquisition module obtains the corresponding first calibration parameter value according to the liquid-containing area, and determines the liquid-containing area according to the liquid-free area. The region acquires the corresponding second calibration parameter value, and the acquisition module collects the fingerprint image of the finger region according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image acquisition, if the finger area includes liquid-containing areas and liquid-free areas, by adjusting the local gain parameters, different calibration parameters can be used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

According to an embodiment of the present invention, the collection module includes: a collection unit, configured to collect the first fingerprint image of the liquid-containing region according to the first calibration parameter value, and collect the obtained fingerprint image according to the second calibration parameter value. the second fingerprint image of the liquid-free area; an image synthesis unit, configured to synthesize the first fingerprint image and the second fingerprint image to generate a fingerprint image of the finger area.

According to an embodiment of the present invention, the first calibration parameter value includes a first gain value and a first offset value, the second calibration parameter value includes a second gain value and a second offset value, and the first A gain value is greater than the second gain value.

According to an embodiment of the present invention, the device further includes: a control module for controlling the temperature of the fingerprint module to remove the liquid in the liquid-containing area; wherein the acquisition module is further configured to: The corresponding third calibration parameter value is acquired from the finger region of the device; the acquisition module is further configured to: acquire the fingerprint image of the finger region after removing the liquid according to the third calibration parameter value.

According to an embodiment of the present invention, the control module includes: a power increasing unit for increasing the power of the fingerprint module so as to increase the temperature of the fingerprint module; or a control unit for controlling the The heating device corresponding to the fingerprint module heats the fingerprint module to heat up the fingerprint module.

To achieve the above purpose, the mobile terminal according to the embodiment of the third aspect of the present invention includes: the device for collecting fingerprint images according to the embodiment of the second aspect of the present invention.

According to the mobile terminal according to the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined by the determination module in the collection device, and the acquisition module obtains the corresponding first calibration parameter value according to the liquid-containing area, and according to the liquid-containing area The liquid area acquires the corresponding second calibration parameter value, and the acquisition module collects the fingerprint image of the finger area according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image acquisition, if the finger area includes liquid-containing areas and liquid-free areas, by adjusting the local gain parameters, different calibration parameters can be used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

In order to achieve the above purpose, the mobile terminal according to the embodiment of the fourth aspect of the present invention includes: one or more processors; a memory; one or more programs, the one or more programs are stored in the memory, and when they are The one or more processors perform the following operations when executing: determine the liquid-containing area and the liquid-free area in the finger area; obtain the corresponding first calibration parameter value according to the liquid-containing area, and obtain the corresponding first calibration parameter value according to the liquid-free area Acquiring a corresponding second calibration parameter value; and collecting a fingerprint image on the finger region according to the first calibration parameter value and the second calibration parameter value.

According to the mobile terminal of the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined first, and then the corresponding first calibration parameter value can be obtained according to the liquid-containing area, and the corresponding first calibration parameter value can be obtained according to the liquid-free area. The second calibration parameter value, and finally, the fingerprint image is collected on the finger region according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image acquisition, if the finger area includes liquid-containing areas and liquid-free areas, by adjusting the local gain parameters, different calibration parameters can be used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a flowchart of a method for collecting a fingerprint image according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for acquiring a fingerprint image according to another embodiment of the present invention;

3 is a schematic structural diagram of an apparatus for collecting fingerprint images according to an embodiment of the present invention;

4 is a schematic structural diagram of a fingerprint image collection device according to a specific embodiment of the present invention;

5 is a schematic structural diagram of an apparatus for collecting fingerprint images according to another specific embodiment of the present invention;

6 is a schematic structural diagram of an apparatus for collecting fingerprint images according to another specific embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an apparatus for collecting fingerprint images according to yet another specific embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following describes the fingerprint image collection method, device, and mobile terminal according to the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for collecting a fingerprint image according to an embodiment of the present invention. It should be noted that the fingerprint image collection method according to the embodiment of the present invention can be applied to a fingerprint image collection device, and the fingerprint image collection device can be configured in a mobile terminal. It can be understood that the mobile terminal may have a fingerprint module to realize functions such as fingerprint encryption, unlocking, and payment through fingerprint identification. The mobile terminal may be a hardware device with various operations, such as a mobile phone, a tablet computer, a palmtop computer, and a personal digital assistant.

As shown in Figure 1, the method for collecting the fingerprint image may include:

S110, determine the liquid-containing area and the liquid-free area in the finger area.

It should be noted that, the fingerprint image collection method of the embodiment of the present invention can collect fingerprint images of pressure fingerprints, and can also collect fingerprint images of ordinary fingerprints, which is not specifically limited in the present invention. Wherein, when the fingerprint image collection method according to the embodiment of the present invention is applied to the collection of the fingerprint image of the pressure fingerprint, that is, when the fingerprint module contains pressure elements to realize the function of the pressure fingerprint, the above-mentioned touch operation may be a press touch, for example , the user presses and touches the fingerprint module; when the fingerprint image collection method of the embodiment of the present invention is applied to the collection of fingerprint images of ordinary fingerprints, that is, the fingerprint module does not contain pressure elements, the acquisition function of ordinary fingerprints is realized at this time. , the above-mentioned touch operation is an ordinary touch, such as directly placing your finger on the surface of the fingerprint module without using pressure.

It can be understood that in the fingerprint recognition process of the fingerprint module in the mobile terminal, when the fingerprint image of the user's finger is collected, the fingerprint module needs to be calibrated first to obtain the corresponding calibration parameters, and the user's finger is collected according to the calibration parameters. fingerprint image. Since the user's finger sometimes contains liquid, in order to ensure the accuracy of the fingerprint image collection, when the trigger event for the acquisition of the calibration parameters is detected, that is, when the event that needs to obtain the calibration parameters is currently triggered, it can be judged that the touch Whether the finger area on the surface of the fingerprint module includes a liquid-containing area and a liquid-free area.

As an example, the above-mentioned specific implementation process of judging whether the finger area touching the surface of the fingerprint module includes a liquid-containing area and a liquid-free area may be as follows: the current capacitance value of the fingerprint module can be obtained first, and the current capacitance value and The difference between the preset capacitance reference values, if the difference is within the preset range, it is determined that the area of the finger touching the surface of the fingerprint module includes a liquid area and a liquid-free area, that is, it is determined that the finger touching the surface of the fingerprint module at this time Contains liquid and non-liquid areas.

Wherein, in the embodiment of the present invention, the above-mentioned preset range may be a range value, which is used to indicate whether the finger area touching the surface of the fingerprint module has a limited value of both liquid area and dry fingerprint area. For example, the above-mentioned When the difference is within the preset range, it can be determined that the finger area has both a liquid area and a dry fingerprint area; when the difference is not within the preset range, and the difference is greater than the maximum value in the preset range , it can be judged that the finger area touching the surface of the fingerprint module is a liquid-free area, that is, the finger is a dry finger, and there is no liquid in the finger area; when the above difference is not within the preset range, and the difference is less than the When the minimum value in the preset range, it can be determined that the area of the finger touching the surface of the fingerprint module is a liquid-containing area, that is, the finger is a wet finger, that is, the finger has a high liquid content, such as a finger that has just washed hands, etc. .

Specifically, when it is determined that the area of the finger touching the surface of the fingerprint module has both liquid-containing areas and liquid-free areas, the fingerprint module can detect the capacitance values of different areas in the finger area, and determine the finger according to the capacitance values. Liquid-containing and liquid-free areas in a zone

S120: Acquire a corresponding first calibration parameter value according to the liquid-containing region, and obtain a corresponding second calibration parameter value according to the liquid-free region.

It can be understood that the calibration parameters for capturing fingerprint images are mainly adc shift, adc gain and pixel gain. Among them, adc shift is the offset of the exponential analog converter, for example, 56*172 pixel points, each point is collected When there is a corresponding value in the picture, there are 10752 pixel values in total, and most of them are distributed in the range of 0.4-0.8. When the values of many points are the same, a distribution map will be formed. There are several shifts in shift. , and the higher the gear, the larger the overall value of the distribution map of the pixel points, and the darker the image will appear; adc gain is the gain of the exponential analog converter, the larger the gain value, the more scattered the distribution map will be. , the smaller the gain value, the more concentrated the distribution map will be, and the more scattered, the higher the contrast of the image, such as black is blacker, and white is whiter. Pixel gain is the gain of the pixel point, which is determined by the parallel capacitor of the amplifier. Multiple capacitors are connected in parallel, and the number of parallel capacitors is controlled by the switch. The more switches are closed, the greater the gain, the greater the pixel value, and the signal The stronger the strength.

In the control process of the analog-to-digital converter in the fingerprint module, the parameters of the pixel gain are generally fixed, mainly to debug adc shift and adc gain, one is to adjust the position of the entire distribution map, and the other is to adjust the concentration of the distribution map. And dispersion, and everyone's fingers are different, require different calibration parameters to debug the acquired images.

For this reason, based on the above characteristics, the present invention obtains different calibration parameter values for different areas in the finger area by combining the judgment results of judging whether the finger area touched on the surface of the fingerprint module includes a liquid-containing area and a liquid-free area. A corresponding first calibration parameter value is obtained from the liquid-containing region, and a corresponding second calibration parameter value is obtained according to the liquid-free region. Wherein, in an embodiment of the present invention, the first calibration parameter value includes a first gain value and a first offset value, the second calibration parameter value includes a second gain value and a second offset value, and the first gain value greater than the second gain value. Because, when there is no liquid on the surface of the fingerprint module, the capacitance of the fingerprint module changes greatly when the user's finger acts on the fingerprint module, and the corresponding gain value for collecting the fingerprint image is small. When there is liquid on the surface of the fingerprint module, The capacitance change of the fingerprint module should be small, and the corresponding gain value for collecting the fingerprint image should be large.

That is to say, when it is judged that the area of the finger touching the surface of the fingerprint module includes a liquid-containing area and a liquid-free area, the adjustment method of the local gain parameter can be used, which are respectively different areas of the finger touching the surface of the fingerprint module. Acquiring corresponding calibration parameter values, so that the fingerprint images of the liquid-containing area and the liquid-free area in the finger area are simultaneously collected by using different calibration parameter values, for example, the first calibration parameter value is used for the liquid-containing area in the finger area, The liquid-free area in the finger area adopts the second calibration parameter value.

S130: Collect a fingerprint image on the finger region according to the first calibration parameter value and the second calibration parameter value.

Specifically, in an embodiment of the present invention, the first fingerprint image of the liquid-containing area may be collected first according to the first calibration parameter value, and the second fingerprint image of the liquid-free area may be collected according to the second calibration parameter value, and then , the first fingerprint image and the second fingerprint image can be synthesized to generate a fingerprint image of the finger region.

More specifically, when judging that the area of the finger touching the surface of the fingerprint module includes a liquid-containing area and a liquid-free area, the local gain parameter adjustment method can be used to scan different areas of the finger, that is, the liquid-containing area and the non-liquid area. liquid area, and capture the fingerprint image of each area according to the calibration parameter values corresponding to the different areas, that is, the fingerprint image of the liquid-containing area and the fingerprint image of the liquid-free area can be obtained at this time. The fingerprint images corresponding to different regions are synthesized to obtain the fingerprint image of the finger region. Therefore, in the process of collecting fingerprint images, by adjusting the local gain parameters, different calibration parameters are used for different areas of the finger, and corresponding fingerprint areas are collected according to different calibration parameters, and finally the fingerprint images of each area are collected. The final fingerprint image of the finger is obtained by synthesizing, which improves the accuracy of collecting the fingerprint image and improves the collecting efficiency.

According to the fingerprint image collection method according to the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined first, and then the corresponding first calibration parameter value is obtained according to the liquid-containing area, and the corresponding first calibration parameter value is obtained according to the liquid-free area. corresponding to the second calibration parameter value, and finally, the fingerprint image is collected on the finger region according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image acquisition, if the finger area includes liquid-containing areas and liquid-free areas, by adjusting the local gain parameters, different calibration parameters can be used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

FIG. 2 is a flowchart of a method for collecting a fingerprint image according to another embodiment of the present invention.

In order to improve usability and feasibility, in the embodiment of the present invention, if the area of the finger touching the surface of the fingerprint module is a liquid-containing area, the entire area of the finger is directly subjected to fingerprint image calibration according to the corresponding first calibration parameter value. Acquisition; if the area of the finger touching the surface of the fingerprint module is a liquid-free area, the fingerprint image of the entire area of the finger is directly collected according to the corresponding second calibration parameter value. Specifically, as shown in FIG. 2 , the method for collecting the fingerprint image may include:

S210, when a trigger event obtained by the calibration parameter is detected, determine whether the finger area touched on the surface of the fingerprint module includes a liquid-containing area and a liquid-free area.

As an example, the above-mentioned specific implementation process of judging whether the finger area touching the surface of the fingerprint module includes a liquid-containing area and a liquid-free area may be as follows: the current capacitance value of the fingerprint module can be obtained first, and the current capacitance value and The difference between the preset capacitance reference values, if the difference is within the preset range, it is determined that the area of the finger touching the surface of the fingerprint module includes a liquid area and a liquid-free area, that is, it is determined that the finger touching the surface of the fingerprint module at this time Contains liquid and non-liquid areas.

S220, if the finger area touched on the surface of the fingerprint module includes a liquid-containing area and a liquid-free area, determine the liquid-containing area and the liquid-free area in the finger area, and obtain the corresponding first calibration parameter value according to the liquid-containing area , and obtain the corresponding second calibration parameter value according to the liquid-free area.

Wherein, in an embodiment of the present invention, the first calibration parameter value includes a first gain value and a first offset value, the second calibration parameter value includes a second gain value and a second offset value, and the first gain value greater than the second gain value.

S230: Collect a fingerprint image on the finger region according to the first calibration parameter value and the second calibration parameter value.

Specifically, in an embodiment of the present invention, the first fingerprint image of the liquid-containing area may be collected first according to the first calibration parameter value, and the second fingerprint image of the liquid-free area may be collected according to the second calibration parameter value, and then , the first fingerprint image and the second fingerprint image can be synthesized to generate a fingerprint image of the finger region.

S240, if the finger area touched on the surface of the fingerprint module is a liquid-containing area, obtain a corresponding first calibration parameter value according to the liquid-containing area, and collect a fingerprint image of the finger area according to the first calibration parameter value.

Specifically, when it is determined that the area of the finger touching the surface of the fingerprint module is a liquid-containing area, that is, there is no dry area in the finger, such as a finger that has just washed your hand, the corresponding first calibration parameter can be obtained according to the liquid-containing area value, and directly collect the fingerprint image of the entire area of the finger according to the first calibration parameter value.

S250, if the finger area touched on the surface of the fingerprint module is a liquid-free area, obtain a corresponding second calibration parameter value according to the liquid-free area, and collect a fingerprint image of the finger area according to the second calibration parameter value.

Specifically, when it is determined that the area of the finger touching the surface of the fingerprint module is a liquid-free area, that is, there is no wet area in the finger, the corresponding second calibration parameter value can be obtained according to the liquid-free area, and according to the first The second calibration parameter value directly captures the fingerprint image of the entire area of the finger.

In order to improve user experience and improve the accuracy of collecting fingerprint images, further, in an embodiment of the present invention, the method for collecting fingerprint images may further include: controlling the temperature of the fingerprint module to remove the liquid in the liquid-containing area; The corresponding third calibration parameter value is acquired according to the finger region after the liquid has been removed, and a fingerprint image of the finger region after the liquid has been removed is collected according to the third calibration parameter value.

That is to say, the fingerprint module in the mobile terminal can be controlled to perform a heating process to remove the liquid in the liquid-containing area, and then, the corresponding third calibration parameter value can be obtained according to the finger area after removing the liquid, and finally, according to the third calibration parameter value. The three calibration parameter values collect fingerprint images of the entire area of the finger.

As an example, the above-mentioned specific implementation process of controlling the temperature of the fingerprint module may be as follows: increasing the power of the fingerprint module to heat the fingerprint module; or, controlling the heating device corresponding to the fingerprint module to heat the fingerprint module, to warm up the fingerprint module. Among them, increasing the power of the fingerprint module can increase the power at the same increase rate, and can also increase the power at a step-change increase rate; controlling the heating device corresponding to the fingerprint module to heat the fingerprint module can be the same The fingerprint module can be heated at a heating rate of 100°C, and the fingerprint module can also be heated at a heating rate that varies in steps, which is not specifically limited in the present invention.

According to the fingerprint image collection method according to the embodiment of the present invention, if the area of the finger touching the surface of the fingerprint module is a liquid-containing area, the fingerprint image collection is directly performed on the entire area of the finger according to the corresponding first calibration parameter value. The area of the finger touching the surface of the fingerprint module is a liquid-free area, then the fingerprint image is directly collected for the entire area of the finger according to the corresponding second calibration parameter value, that is, according to different judgment results, different strategies are used to measure the fingerprint image of the finger. The fingerprint image is collected, the collection method of the fingerprint image is optimized, and the usability and feasibility are improved.

Corresponding to the methods for collecting fingerprint images provided by the above-mentioned embodiments, an embodiment of the present invention further provides a device for collecting fingerprint images. This example corresponds to the fingerprint image collection method provided in this example. Therefore, the foregoing embodiments of the fingerprint image collection method are also applicable to the fingerprint image collection device provided in this example, and will not be described in detail in this example. FIG. 3 is a schematic structural diagram of an apparatus for collecting fingerprint images according to an embodiment of the present invention. As shown in FIG. 3 , the fingerprint image collection device may include: a determination module 310 , an acquisition module 320 and a collection module 330 .

Specifically, the determination module 310 may be used to determine the liquid-containing area and the liquid-free area in the finger area.

The obtaining module 320 may be configured to obtain the corresponding first calibration parameter value according to the liquid-containing region, and obtain the corresponding second calibration parameter value according to the liquid-free region. Wherein, in an embodiment of the present invention, the first calibration parameter value may include a first gain value and a first offset value, the second calibration parameter value may include a second gain value and a second offset value, and the first gain value value is greater than the second gain value.

The acquisition module 330 may be configured to perform fingerprint image acquisition on the finger region according to the first calibration parameter value and the second calibration parameter value.

Specifically, in an embodiment of the present invention, as shown in FIG. 4 , the acquisition module 330 may include an acquisition unit 331 and an image synthesis unit 332 . The acquisition unit 331 may be configured to acquire the first fingerprint image of the liquid-containing region according to the first calibration parameter value, and to acquire the second fingerprint image of the liquid-free region according to the second calibration parameter value. The image synthesis unit 332 may be configured to combine the first fingerprint image and the second fingerprint image to generate a fingerprint image of the finger region.

In order to improve user experience and improve the accuracy of collecting fingerprint images, further, in an embodiment of the present invention, as shown in FIG. 5 , the fingerprint image collecting device may further include: a control module 340 . Specifically, the control module 340 can be used to control the temperature of the fingerprint module to remove the liquid in the liquid-containing area. Wherein, in the embodiment of the present invention, the obtaining module 320 may be further configured to obtain the corresponding third calibration parameter value according to the finger region after removing the liquid. The acquisition module 330 is further configured to: acquire the fingerprint image of the finger region after removing the liquid according to the third calibration parameter value.

As an example, as shown in FIG. 6 , the control module 340 may include: a power increasing unit 341 , and the power increasing unit 341 may be used to increase the power of the fingerprint module to increase the temperature of the fingerprint module.

As another example, as shown in FIG. 7 , the control module 340 may include: a control unit 342 , and the control unit 342 may be configured to control the heating device corresponding to the fingerprint module to heat the fingerprint module, so as to heat the fingerprint module.

According to the fingerprint image collection device of the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined by the determination module, and the acquisition module obtains the corresponding first calibration parameter value according to the liquid-containing area, and determines the liquid-containing area according to the liquid-free area. The region acquires the corresponding second calibration parameter value, and the acquisition module collects the fingerprint image of the finger region according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image acquisition, if the finger area includes liquid-containing areas and liquid-free areas, by adjusting the local gain parameters, different calibration parameters can be used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

In order to realize the above-mentioned embodiments, the present invention also provides a mobile terminal, which may include the fingerprint image collection device according to any one of the above-mentioned embodiments of the present invention.

According to the mobile terminal of the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined by the determination module in the collection device, and the acquisition module obtains the corresponding first calibration parameter value according to the liquid-containing area, and according to the non-liquid area The liquid area acquires the corresponding second calibration parameter value, and the acquisition module collects the fingerprint image of the finger area according to the first calibration parameter value and the second calibration parameter value. That is, in the process of fingerprint image collection, if the finger area includes liquid-containing areas and non-liquid areas, by adjusting the local gain parameters, different calibration parameters are used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

In order to realize the above-mentioned embodiment, the present invention also proposes another mobile terminal, comprising: one or more processors; a memory; one or more programs, where the one or more programs are stored in the memory, and when used by one or more The processor executes the following operations:

S110', determining the liquid-containing area and the liquid-free area in the finger area.

S120', obtain the corresponding first calibration parameter value according to the liquid-containing area, and obtain the corresponding second calibration parameter value according to the liquid-free area.

S130', collect a fingerprint image on the finger region according to the first calibration parameter value and the second calibration parameter value.

According to the mobile terminal of the embodiment of the present invention, the liquid-containing area and the liquid-free area in the finger area can be determined first, and then the corresponding first calibration parameter value is obtained according to the liquid-containing area, and the corresponding first calibration parameter value is obtained according to the liquid-free area. Two calibration parameter values, and finally, according to the first calibration parameter value and the second calibration parameter value, the fingerprint image is collected on the finger region. That is, in the process of fingerprint image collection, if the finger area includes liquid-containing areas and non-liquid areas, by adjusting the local gain parameters, different calibration parameters are used for different areas of the finger, and at the same time according to different calibration parameters. The corresponding fingerprint area is collected by parameters, and finally the fingerprint images of each area are synthesized to obtain the final fingerprint image of the finger, which improves the accuracy of collecting fingerprint images, improves the collection efficiency, and improves the accuracy of fingerprint identification.

In the description of the present invention, it should be understood that the terms "first" and "second" are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Any description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a specified logical function or step of the process , and the scope of the preferred embodiments of the invention includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present invention belong.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use with, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus, or apparatus) or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of the present invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like. Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (11)

1. a collection method of fingerprint image, is characterized in that, comprises the following steps: Determining fluid-containing and fluid-free areas in the finger area; Obtain the corresponding first calibration parameter value according to the liquid-containing area in the finger area, and obtain the corresponding second calibration parameter value according to the liquid-free area in the finger area; According to the first calibration parameter value and the second calibration parameter value, the fingerprint image is collected on the finger region at the same time. 2. The method according to claim 1, wherein the collecting the fingerprint image on the finger region according to the first calibration parameter value and the second calibration parameter value comprises: Collect a first fingerprint image of the liquid-containing area according to the first calibration parameter value, and collect a second fingerprint image of the liquid-free area according to the second calibration parameter value; The first fingerprint image and the second fingerprint image are synthesized to generate a fingerprint image of the finger region. 3. The method of claim 1, wherein the first calibration parameter value includes a first gain value and a first offset value, and the second calibration parameter value includes a second gain value and a second offset value shift value, and the first gain value is greater than the second gain value. 4. The method of claim 1, wherein the method further comprises: controlling the temperature of the fingerprint module to remove the liquid in the liquid-containing area; A corresponding third calibration parameter value is acquired according to the finger region after the liquid has been removed, and a fingerprint image of the finger region after the liquid has been removed is collected according to the third calibration parameter value. 5. The method of claim 4, wherein the controlling the temperature of the fingerprint module comprises: increasing the power of the fingerprint module to heat up the fingerprint module; or The heating device corresponding to the fingerprint module is controlled to heat the fingerprint module, so as to heat up the fingerprint module. 6. A device for collecting fingerprint images, comprising: a determination module for determining the liquid-containing area and the liquid-free area in the finger area; an acquisition module, configured to acquire the corresponding first calibration parameter value according to the liquid-containing region in the finger region, and obtain the corresponding second calibration parameter value according to the liquid-free region in the finger region; The acquisition module is configured to simultaneously collect the fingerprint image of the finger region according to the first calibration parameter value and the second calibration parameter value. 7. The apparatus of claim 6, wherein the acquisition module comprises: an acquisition unit, configured to acquire a first fingerprint image of the liquid-containing region according to the first calibration parameter value, and to acquire a second fingerprint image of the liquid-free region according to the second calibration parameter value; An image synthesizing unit, configured to synthesize the first fingerprint image and the second fingerprint image to generate a fingerprint image of the finger region. 8. The apparatus of claim 6, wherein the first calibration parameter value includes a first gain value and a first offset value, and the second calibration parameter value includes a second gain value and a second offset value shift value, and the first gain value is greater than the second gain value. 9. The apparatus of claim 6, wherein the apparatus further comprises: a control module for controlling the temperature of the fingerprint module to remove the liquid in the liquid-containing area; Wherein, the obtaining module is further configured to: obtain the corresponding third calibration parameter value according to the finger region after removing the liquid; The acquisition module is further configured to: acquire the fingerprint image of the finger region after removing the liquid according to the third calibration parameter value. 10. The apparatus of claim 9, wherein the control module comprises: A power increasing unit, used to increase the power of the fingerprint module, so as to heat up the fingerprint module; or The control unit is used for controlling the heating device corresponding to the fingerprint module to heat the fingerprint module, so as to heat up the fingerprint module. 11. A mobile terminal, comprising: the fingerprint image collection device according to any one of claims 6 to 10.