TWI607388B - Method of fingerprint verification and electronic apparatus using the same - Google Patents

Description

Fingerprint verification method and electronic device thereof

The invention relates to a verification method and device, and in particular to a fingerprint verification method and an electronic device thereof.

Today, fingerprint sensors are almost standard equipment for a variety of electronic devices. Distinguishable by identification technology, it can be divided into optical, thermal, ultrasonic and capacitive. Among them, capacitive fingerprint identification technology has a wide range of applications. In short, the way of fingerprint identification is to identify the change of the concave and convex lines of the fingerprint to obtain the fingerprint information. Since the fingerprint has different embossed lines, when the fingerprint contacts the sensing panel, the capacitance values of the different sensing regions on the sensing panel will respectively change corresponding to the different lines touched, wherein the concave portion of the fingerprint has a capacitance value Small, and the capacitance value induced in the convex portion of the fingerprint is large. However, the variation of the fingerprint's texture is quite small, and the capacitance value induced on the sensing panel may be only 0.1 Farad and 1 Farad. Therefore, when fingerprint recognition occurs, if there is noise interference, the fingerprint identification system receives the sensing signal about the change of the capacitance value to analyze the change of the capacitance value, and is susceptible to the influence of the noise, resulting in the misjudgment of the signal. Affect the accuracy of fingerprint identification.

In addition, in order to take into account the size of the electronic device, the area occupied by the fingerprint sensor is often small, and the fingerprint information that can be obtained is also small, and the accuracy of fingerprint recognition may also decrease. Therefore, how to improve the accuracy of fingerprint recognition is a very important topic at present.

In view of this, the present invention provides a fingerprint verification method and an electronic device thereof. In addition to the information of the fingerprint image itself, the user's finger sliding track is calculated therefrom, and the fingerprint related information that the fingerprint sensor can provide can be increased.

The fingerprint verification method of the invention is applicable to an electronic device, and the method sequentially acquires multiple sliding fingerprint images, combines the obtained multiple sliding fingerprint images into an integrated fingerprint image, and compares the templates of the integrated fingerprint image and the electronic device storage. Fingerprint image to determine whether the obtained multiple fingerprint images have passed verification. The method further calculates a sliding trajectory corresponding to the obtained sliding fingerprint images, and compares the sliding trajectory with at least one preset trajectory of the electronic device to determine whether the sliding trajectory is verified.

In an embodiment of the invention, if it is determined that the obtained plurality of sliding fingerprint images and the sliding trajectory are verified, the electronic device is unlocked.

In an embodiment of the present invention, if it is determined that the obtained plurality of sliding fingerprint images are verified, and the sliding track corresponds to one of the at least one preset trajectory, according to the preset trajectory corresponding to the sliding trajectory Activate specific functions of the electronic device.

In an embodiment of the present invention, the step of calculating the sliding trajectory corresponding to the plurality of sliding fingerprint images according to the obtained order of acquiring the plurality of sliding fingerprint images comprises: comparing the overlap between the sliding fingerprint images according to the obtaining order. Part, and calculate the sliding trajectory based on the overlapping portion.

In an embodiment of the present invention, the step of calculating the sliding trajectory corresponding to the plurality of sliding fingerprint images according to the obtained order of acquiring the plurality of sliding fingerprint images comprises: comparing the sliding fingerprint images with the template fingerprint images to obtain The position of each sliding fingerprint image on the template fingerprint image, and the position of each sliding fingerprint image and its position on the template fingerprint image are used to calculate the sliding track.

The electronic device of the present invention comprises a fingerprint acquisition module, a fingerprint integration module, a trajectory calculation module and a fingerprint verification module. The fingerprint acquisition module sequentially acquires multiple sliding fingerprint images. The fingerprint integration module combines the obtained multiple sliding fingerprint images into an integrated fingerprint image. The trajectory calculation module calculates the sliding trajectory corresponding to the plurality of sliding fingerprint images according to the acquired order of the plurality of sliding fingerprint images. The fingerprint verification module compares the fingerprint image and the template fingerprint image stored by the electronic device to determine whether the obtained plurality of sliding fingerprint images are verified. The fingerprint verification module compares the sliding track with at least one preset track of the electronic device to determine whether the sliding track is verified.

In an embodiment of the invention, if the fingerprint verification module determines that the obtained plurality of sliding fingerprint images and the sliding track are verified, the electronic device is unlocked.

In an embodiment of the present invention, if the fingerprint verification module determines that the obtained plurality of sliding fingerprint images are verified, and the sliding track corresponds to one of the at least one preset trajectory, according to the sliding trajectory A corresponding preset track is used to activate a specific function of the electronic device.

In an embodiment of the invention, the trajectory calculation module compares the overlapping portions between the sliding fingerprint images according to the acquired order of the plurality of sliding fingerprint images, and calculates the sliding trajectory according to the overlapping portion.

In an embodiment of the invention, the fingerprint verification module compares each of the sliding fingerprint image and the template fingerprint image to obtain the position of each sliding fingerprint image on the template fingerprint image. The trajectory calculation module calculates the sliding trajectory according to the position of each sliding fingerprint image on the template fingerprint image.

Based on the above, the fingerprint verification method and the electronic device of the present invention combine the acquired multiple sliding fingerprint images into an integrated fingerprint image, and the integrated fingerprint image can be used to determine whether multiple sliding fingerprint images can pass the verification. In addition, the fingerprint verification method and the electronic device thereof of the present invention further calculate a sliding trajectory corresponding to the obtained plurality of sliding fingerprint images as another information other than the integrated fingerprint image. In this way, more fingerprint related information can be obtained from the obtained plurality of sliding fingerprint images.

The above described features and advantages of the invention will be apparent from the following description.

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention. Referring to FIG. 1 , the electronic device 100 of the embodiment is, for example, a smart phone, a personal digital assistant (PDA), a tablet PC, a notebook computer, a desktop computer, or other types of electronic devices. Device. The electronic device 100 includes a fingerprint sensor 110, a processor 120, and a storage device 130, the functions of which are described below.

The fingerprint sensor 110 is, for example, a fingerprint sensor, an optical sensor, a thermal sensor, or a fingerprint sensor of an ultrasonic sensor. In this embodiment, the fingerprint sensor 110 is configured to sense whether a user's finger touch occurs to transmit an activation signal to the processor 120 to notify the processor 120 to control the fingerprint sensor 110 to capture the fingerprint of the user's finger. image.

The storage device 130 can be any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory (flash memory) or the like. Element or combination of the above elements. In this embodiment, the storage device 130 is configured to record a template fingerprint image. The template fingerprint image is, for example, a fingerprint image registered by the fingerprint sensor 110, and the template fingerprint image after registration can be used as a basis for determining whether the fingerprint image can pass the verification. Incidentally, the present invention does not limit the number of template fingerprint images, which may be one or more.

In this embodiment, the storage device 130 includes a fingerprint acquisition module 131, a fingerprint integration module 133, a trajectory calculation module 135, and a fingerprint verification module 137. The modules are, for example, programs stored in the storage device 130.

The processor 120 is, for example, a central processing unit (CPU), or another programmable general purpose or special purpose microprocessor (Microprocessor), a digital signal processor (DSP), and a programmable program. Design controllers, Application Specific Integrated Circuits (ASICs), Programmable Logic Devices (PLDs), or other similar devices or combinations of these devices. The processor 120 is connected to the fingerprint sensor 110 and the storage device 130, and loads the fingerprint acquisition module 131, the fingerprint integration module 133, the trajectory calculation module 135, and the fingerprint verification module 137 from the storage device 130. The fingerprint verification method of the present invention is performed. The detailed steps of this method are illustrated by the following examples.

2 is a flow chart of a fingerprint verification method according to an embodiment of the invention. Referring to FIG. 2, the method of the present embodiment is applied to the electronic device 100 of FIG. 1, and the detailed steps of the fingerprint verification method of the present invention are described below with the components in the electronic device 100.

First, the fingerprint acquisition module 131 sequentially acquires a plurality of sliding fingerprint images by the fingerprint sensor 110 (step S210). FIG. 3 is a schematic diagram of acquiring multiple sliding fingerprint images according to an embodiment of the invention. As shown in FIG. 3, in the present embodiment, with respect to the fingerprint sensor 110, the user's finger slides to the right, for example, in the direction indicated by the arrow in the figure, and then slides to the left. The fingerprint acquisition module 131 acquires, for example, six sliding fingerprint images SIFMG1 to SIFMG6 when the user's finger slides on the fingerprint sensor 110 at predetermined time intervals by the fingerprint sensor 110. Since the user's finger slides to the right relative to the fingerprint sensor 110 and then slides to the left, the sliding fingerprint images SFMMG1~SFIMG6 are positioned first to the left and then to the upper right relative to the finger of the user. 6 sliding fingerprint images on the top. Incidentally, the present invention does not limit the predetermined time interval and the number of the obtained sliding fingerprint images. In other embodiments, the fingerprint obtaining module 131 may also obtain, for example, 8 or more slides. Fingerprint image. In other words, the person skilled in the art can set the predetermined time interval, the total length of time, and the quantity obtained by acquiring the plurality of sliding fingerprint images according to requirements, and the invention is not limited.

Next, the fingerprint integration module 133 combines the plurality of sliding fingerprint images into an integrated fingerprint image (step S220). FIG. 4 is a schematic diagram of acquiring an integrated fingerprint image according to an embodiment of the invention. As shown in FIG. 4, in the embodiment, the fingerprint integration module 133 combines the sliding fingerprint images SFMMG1~SFIMG6 obtained by the fingerprint acquisition module 131 into an integrated fingerprint image CFIMG. Specifically, the fingerprint integration module 133 determines the overlapping regions of the sliding fingerprint images SFMMG1~SFIMG6, and then overlaps the determined overlapping regions to obtain a larger integrated fingerprint image CFIMG. In short, the integrated fingerprint image CFIMG can be regarded as a joint image of the obtained six sliding fingerprint images SIFMG1~SFIMG6.

Taking the sliding fingerprint images SFMMG1 and SFIMG2 of the present embodiment as an example, the fingerprint integration module 133 determines that the overlapping portion OVP (filled with oblique lines) of the sliding fingerprint images SFIMG1 and SFIMG2 is located in the left half of the sliding fingerprint image SFMMG1, and the overlapping portion The OVP is located in the right half of the sliding fingerprint image SFMMG2. The fingerprint integration module 133 overlaps the overlapped portion OVP1 of the sliding fingerprint image SFMMG1 and the sliding fingerprint image SFMMG2, so that the sliding fingerprint images SFMMG1 and SFIMG2 can be combined to obtain a combined image of the two. In this way, an integrated fingerprint image CFIMG combined with the sliding fingerprint images SFMMG1~SFIMG6 can be obtained.

In particular, the combined integrated fingerprint image CFIMG can contain more fingerprint information than the fingerprint image captured by the fingerprint sensor 110 (for example, one of the sliding fingerprint images SFMMG1~SFIMG6). Therefore, the fingerprint sensor 110 of the embodiment can be implemented in a small size, and can also acquire sufficient fingerprint information for verification.

In addition to combining the plurality of sliding fingerprint images to obtain the integrated fingerprint image, the trajectory calculation module 135 calculates the sliding trajectory corresponding to the plurality of sliding fingerprint images according to the order in which the plurality of sliding fingerprint images are acquired (step S230). FIG. 5 is a schematic diagram of calculating a sliding trajectory according to an embodiment of the invention. As shown in FIG. 5, in this embodiment, the order of acquiring the plurality of sliding fingerprint images is SFIMG1, SFIMG2, SFIMG3, SFIMG4, SFIMG5, and SFIMG6. Therefore, the trajectory calculation module 135 first determines the sliding direction SD1 of the sliding fingerprint images SFMMG1, SFMMG2, and then determines the sliding direction SD2 of the sliding fingerprint images SFIMG2 and SFMMG3, and so on can obtain the sliding directions SD1 to SD5.

In this embodiment, the trajectory calculation module 135 compares the overlapping portions between the sliding fingerprint images according to the acquisition order of the plurality of sliding fingerprint images SFMMG1~SFIMG6, and then calculates the sliding trajectory according to the compared overlapping portions. Taking the sliding fingerprint images SFMMG1 and SFIMG2 of the present embodiment as an example, the trajectory calculation module 135 compares the overlapping portions OVP of the sliding fingerprint images SFIMG1 and SFIMG2. As described in the above paragraph, the overlapping portion OVP is located in the left half of the sliding fingerprint image SFMMG1, and the overlapping portion OVP is located in the right half of the sliding fingerprint image SFMMG2. Therefore, the trajectory calculation module 135 determines that the sliding direction SD1 of the user's finger slides to the right in the period from the acquisition of the sliding fingerprint image SFMMG1 to the acquisition of the sliding fingerprint image SFMMG2. Then, the trajectory calculation module 135 sequentially compares the overlapping portions of the sliding fingerprint images SFMMG2, SFMMG3, sliding fingerprint images SFMMG3, SFIMG4, sliding fingerprint images SFMMG4, SFIMG5, sliding fingerprint images SFMMG5, SFMMG6 to determine the respective sliding directions SD2. ~SD5. Finally, the sliding directions SD1~SD5 can be combined into the sliding track of the user's finger, that is, first to the right and then to the lower left.

In another embodiment, the storage device 130 stores a template fingerprint image TFIMG registered by the user. Therefore, the fingerprint verification module 137 can also compare the sliding fingerprint images SFIMG1~SFIMG6 and the template fingerprint image TFIMG to obtain the position of the TFIMG of each sliding fingerprint image SFMMG1~SFIMG6 on the template fingerprint image (for example, the sliding fingerprint image center). The coordinates of the template fingerprint image TFIMG are then calculated, and then the trajectory calculation module 135 calculates the sliding trajectory according to the position of the sliding fingerprint images SFMMG1~SFIMG6 and its position on the template fingerprint image TFIMG.

FIG. 6 is a schematic diagram of calculating a sliding trajectory according to another embodiment of the invention. Specifically, as shown in FIG. 6, the fingerprint verification module 137 compares the positions of the respective sliding fingerprint images SIFMG1~SFIMG6 on the template fingerprint image TFIMG. Then, according to the acquisition order and the template fingerprint image TFIMG, the trajectory calculation module 135 can determine that each of the sliding fingerprint images SFMMG1~SFIMG6 corresponds to the position of the template fingerprint image TFIMG first to the left and then to the upper right. In detail, the sliding direction SD1 may be, for example, a coordinate of the sliding fingerprint image SFMMG1 on the template fingerprint image TFIMG, subtracting the coordinates of the sliding fingerprint image SFIMG2 on the template fingerprint image TFIMG, the obtained vector, and so on. In this way, the trajectory calculation module 135 can further determine that the sliding trajectory of the user's finger corresponding to the sliding fingerprint images SFMMG1~SFIMG6 is first to the right and then to the lower left.

After obtaining the integrated fingerprint image CFIMG, the fingerprint verification module 137 compares the fingerprint image CFIMG with the template fingerprint image TFIMG stored in the storage device 130 of the electronic device 100 to determine whether the sliding fingerprint images SFMMG1~SFIMG6 are verified (steps). S240). In this embodiment, the fingerprint verification module 137 obtains, for example, multiple feature points in the integrated fingerprint image CFIMG to compare with multiple feature points in the template fingerprint image TFIMG, and determines whether the number of matched feature points is reached. The request is based on whether the integrated fingerprint image CFIMG is verified. When the integrated fingerprint image CFIMG is verified, it is determined that the sliding fingerprint images SFMMG1~SFIMG6 are also verified. A person having ordinary knowledge in the field should be able to understand the specific means and method for comparing the fingerprint image CFIMG and the template fingerprint image TFIMG to determine whether the integrated fingerprint image CFIMG can be verified, and therefore will not be further described herein.

After the sliding track is obtained, the fingerprint verification module 137 compares the sliding track with at least one preset track of the electronic device 100 to determine whether the obtained sliding track is verified (step S250). In this embodiment, the processor 120 of the electronic device 100 presets a preset trajectory useful for verification, for example, first to the right and then to the lower left. When the sliding track matches the preset track, for example, both are first to the right and then to the left, the fingerprint verification module 137 determines that the sliding track is verified.

However, the present invention does not limit the number of preset tracks. In another embodiment, for example, a plurality of preset trajectories may be preset in the processor 120 or stored in the storage device 130, and each of the preset trajectories respectively corresponds to one of the specific functions of the electronic device 100. When the sliding track matches one of the plurality of preset tracks, the fingerprint verification module 137 also determines that the sliding track is verified.

Therefore, the electronic device 100 of the embodiment of the present invention obtains the fingerprint of the user by using the fingerprint sensor 110 in addition to the integrated fingerprint image CFIMG containing more fingerprint information than the single captured fingerprint image. Sliding track. As a result, the electronic device 100 has more fingerprint information to be applied, which increases the flexibility in fingerprint verification.

For example, when the fingerprint verification module 137 simultaneously determines that the sliding fingerprint images SIFMG1~SFIMG6 and the sliding trajectory are verified, the electronic device 100 is unlocked. In detail, the addition of the fingerprint information of the sliding track can increase the security when the electronic device 100 is unlocked.

For another example, when the fingerprint verification module 137 determines that the sliding fingerprint images SIFMG1~SFIMG6 are verified, and the sliding trajectory is one of the preset trajectories matching a plurality of specific functions corresponding to the electronic device 100, according to the sliding The preset trajectory matched by the trajectory starts a corresponding specific function in the electronic device 100. In detail, the fingerprint information with the added sliding track can achieve the purpose of verifying and starting a specific function in one sliding of the user's finger.

In summary, the fingerprint verification method and the electronic device of the present invention combine the obtained multiple sliding fingerprint images into an integrated fingerprint image, and the integrated fingerprint image can be used to determine whether multiple sliding fingerprint images can pass the verification. In addition, the fingerprint verification method and the electronic device thereof of the present invention further calculate a sliding trajectory corresponding to the obtained plurality of sliding fingerprint images as another information other than the integrated fingerprint image. In this way, more fingerprint related information can be obtained from the obtained multiple sliding fingerprint images by reducing the volume required for the fingerprint sensor in the electronic device.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Electronic devices

110‧‧‧Finger sensor

120‧‧‧ processor

130‧‧‧Storage device

131‧‧‧Fingerprint acquisition module

133‧‧‧Fingerprint integration module

135‧‧‧Track calculation module

137‧‧‧Fingerprint verification module

CFIMG‧‧‧ integrated fingerprint image

OVP‧‧‧ overlap

S210~S250‧‧‧Steps for fingerprint verification method

SD1~SD5‧‧‧ sliding direction

SFIMG1~SFIMG6‧‧‧Sliding fingerprint image

TFIMG‧‧‧Template Fingerprint Image

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention. 2 is a flow chart of a fingerprint verification method according to an embodiment of the invention. FIG. 3 is a schematic diagram of acquiring multiple sliding fingerprint images according to an embodiment of the invention. FIG. 4 is a schematic diagram of acquiring an integrated fingerprint image according to an embodiment of the invention. FIG. 5 is a schematic diagram of calculating a sliding trajectory according to an embodiment of the invention. FIG. 6 is a schematic diagram of calculating a sliding trajectory according to another embodiment of the invention.

S210~S250‧‧‧Steps for fingerprint verification method

Claims (6)

A fingerprint verification method, which is applicable to an electronic device, comprising: sequentially acquiring a plurality of sliding fingerprint images; combining the plurality of sliding fingerprint images as an integrated fingerprint image; and calculating the plurality according to the obtaining order of the plurality of sliding fingerprint images Sliding a trajectory corresponding to the sliding fingerprint image; comparing the integrated fingerprint image with the template fingerprint image stored by the electronic device to determine whether the plurality of sliding fingerprint images are verified; and comparing the sliding trajectory with the At least one preset trajectory of the electronic device is determined to determine whether the sliding trajectory is verified. The step of calculating the sliding trajectory corresponding to the multiple sliding fingerprint images according to the obtaining order of the multiple sliding fingerprint images comprises: Comparing each sliding fingerprint image with the template fingerprint image to obtain a position of each sliding fingerprint image on the template fingerprint image; and according to the obtaining order of each sliding fingerprint image and its location on the template fingerprint image The position is calculated, and the sliding track is calculated. The fingerprint verification method of claim 1, wherein the electronic device is unlocked if it is determined that the plurality of sliding fingerprint images and the sliding track are verified. The fingerprint verification method according to claim 1, wherein if the plurality of sliding fingerprint images are determined to pass the verification, and the sliding track matches One of the at least one preset trajectory activates a specific function of the electronic device according to the preset trajectory matched by the sliding trajectory. An electronic device comprising: a fingerprint acquisition module, sequentially acquiring a plurality of sliding fingerprint images; a fingerprint integration module combining the plurality of sliding fingerprint images as an integrated fingerprint image; and a trajectory calculation module according to the plurality of sliding fingerprints a sequence of obtaining images, calculating a sliding track corresponding to the plurality of sliding fingerprint images; and a fingerprint verification module, comparing the integrated fingerprint image with a template fingerprint image stored by the electronic device to determine the plurality of sliding fingerprints Whether the image is verified, and the sliding track and the at least one predetermined trajectory of the electronic device are compared to determine whether the sliding track is verified, wherein the fingerprint verification module compares each sliding fingerprint image And the template fingerprint image to obtain a position of each sliding fingerprint on the template fingerprint image, and the trajectory calculation module is configured according to the acquiring order of each sliding fingerprint image and the template fingerprint image Position, the sliding trajectory is calculated. The electronic device of claim 4, wherein the electronic device is unlocked if the fingerprint verification module determines that the plurality of sliding fingerprint images and the sliding track are verified. The electronic device of claim 4, wherein the fingerprint verification module determines that the plurality of sliding fingerprint images are verified, and the sliding track corresponds to one of the at least one preset track For example, the specific function of the electronic device is activated according to the preset trajectory corresponding to the sliding trajectory.