TWI850079B - Registering method of a biometric and biometric sensing device - Google Patents

Abstract

A registering method for a biometric, including: a. obtaining a registered first biometric information corresponding to a first biometric image; b. generating a second biometric information according to a second biometric image; c. determining that the degree of overlap between the first biometric image and the second biometric image is less than a first preset values; d. after Step C, mark this second biometric information as unrewritable; and e. registering the second biometric information.

Description

Biometric registration method and biometric sensing device

The present invention relates to a biometric sensing device, and more particularly to a biometric registration method.

Many electronic devices (such as mobile phones) use the user's biometrics (such as fingerprints) to determine the user's identity. Taking fingerprint verification as an example, when performing fingerprint registration, the user touches a fingerprint sensor with his finger to input the fingerprint. The fingerprint input by the user is used to generate a biometric information and stored as a comparison template for identity authentication.

When the size of the fingerprint sensor is relatively small, users usually register with the fingerprint of a part of the finger, such as the fingerprint of the fingertip area 10 in FIG1 . However, due to the change of usage habits, the user may slowly change the area of the finger that contacts the fingerprint sensor, such as from the fingertip area 10 to the finger pulp area 12. When the contacted area deviates too much from the originally registered fingertip area 10, the identity recognition device will determine that the user's identity is unqualified, and the user may have to try multiple times before passing the identity authentication, resulting in a poor user experience. One way to improve this problem is to add or update the matching templates in the identity recognition device as the user's usage habits change, so that the user can still have a good usage experience after changing his usage habits.

However, the number of matching templates that can be stored in the electronic device is limited. Once the number of matching templates reaches the upper limit, the new matching template will overwrite the original matching template. In this way, the matching template obtained during the initial registration will be overwritten, that is, the matching template corresponding to the fingertip area 10 will disappear, causing the user to fail to pass the identity authentication when using the fingerprint area during registration.

One of the purposes of the present invention is to provide a method for registering biological characteristics.

One of the purposes of the present invention is to provide a biometric sensing device.

According to the present invention, a biometric registration method includes the following steps: a. obtaining a first biometric information to be registered, the first biometric information corresponding to a first biometric image; b. generating a second biometric information according to the second biometric image; c. determining that the overlap between the first biometric image and the second biometric image is less than a first preset value; d. after step c, marking the second biometric information as non-overwriteable; and e. registering the second biometric information.

According to the present invention, a biometric registration method includes the following steps: a. obtaining a plurality of first biometric information to be registered, wherein the plurality of first biometric information respectively corresponds to a plurality of first biometric images; b. generating a second biometric information according to a second biometric image; c. determining that the degree of overlap between the second biometric image and each of the plurality of first biometric images is less than a first preset value; d. after step c, marking the second biometric information as non-overwriteable; and e. registering the second biometric information.

According to the present invention, a biometric sensing device includes a memory, a sensor, and a processor. The memory stores registered first biometric information, and the first biometric information corresponds to a first biometric image. The sensor is used to sense the biometrics of a user to generate a second biometric image. The processor is connected to the memory and the sensor to perform the following steps: a. Determine whether the overlap between the first biometric image and the second biometric image is less than a first preset value; b. After step a, mark the second biometric information as non-overwritable; and c. Store the second biometric information in the memory to register the second biometric information.

According to the present invention, a biometric sensing device includes a memory, a sensor, and a processor. The memory stores a plurality of registered first biometric information, and the plurality of first biometric information respectively corresponds to a plurality of first biometric images. The sensor is used to sense the biometrics of a user to generate a second biometric image. The processor is connected to the memory and the sensor to perform the following steps: a. Determine that the degree of overlap between the second biometric image and each of the plurality of first biometric images is less than a first preset value; b. After step a, mark the second biometric information as non-overwritable; and c. Store the second biometric information in the memory to register the second biometric information.

The biometric registration method of the present invention marks part of the biometric information input by the user as non-overwriteable. Therefore, after the user's usage habits change, although part of the biometric information input during registration may be updated or overwritten, the biometric information marked as non-overwriteable will be retained, so that the user can still use the fingerprint area during registration to pass the identity authentication, thereby improving the user's usage experience.

FIG2 shows a first embodiment of the biometric registration method of the present invention. FIG5 shows a second embodiment of the biometric registration method of the present invention, and FIG3 illustrates a biometric sensing device for implementing the method described in FIG2 or FIG5. In FIG3, the biometric sensing device includes a sensor 1, a processor 2, and a memory 3. The memory 3 is used to store one or more first biometric information registered. The sensor 1 is used to sense a user's biometrics to generate a second object feature image. The processor 2 is connected to the memory 3 and the sensor 1 to execute part or all of the steps of FIG2 or FIG5. In one embodiment, the sensor 1 is a fingerprint sensor, and the memory 3 is a flash memory.

In FIG2 , step S10 includes obtaining a first biometric information registered, and the first biometric information corresponds to a first biometric image. Step S12 includes generating a second biometric information based on the second biometric image. In one embodiment, the first biometric image and the second biometric image are obtained by sensing the biometrics of a user via the biometric sensing device shown in FIG3 . In the process of sensing the user's biometrics, a plurality of biometric images are generated sequentially, and the first biometric image is generated before the second biometric image. In one embodiment, the first biometric image is the previous image of the second biometric image. In another embodiment, there is at least one biometric image between the first biometric image and the second biometric image. The first biometric image and the second biometric image are of the same type of biometrics. The method of generating the second biometric feature information in step S12 may be to extract the features of the second biometric feature image by an algorithm to obtain the second biometric feature information.

Step S14 includes determining whether the overlap degree between the first biometric image and the second biometric image is less than a first preset value. There may be different methods for determining the overlap degree between the first biometric image and the second biometric image. In one embodiment, step S14 is to determine whether the overlap area ratio between the first biometric image and the second biometric image is less than the first preset value. This can be understood as representing the overlap degree between the two images by the overlap area ratio between the two images. If the overlap area ratio between the two images is less than the first preset value, it means that the overlap degree between the two images is less than the first preset value. In another embodiment, step S14 is to determine whether the straight line distance, horizontal distance, vertical distance, or the sum of the horizontal distance and the vertical distance between the center point of the first biometric image and the center point of the second biometric image is greater than a second preset value. This can be understood as representing the degree of overlap between the two images by the distance between the center points of the two images. If the distance between the center points of the two images is greater than a second preset value, it means that the degree of overlap between the two images is less than the first preset value. In one embodiment, step S14 determines the degree of overlap based on the first biometric information and the second biometric information.

If it is determined in step S14 that the overlap between the first biometric image and the second biometric image is less than a first preset value, then step S16 is performed to mark the second biometric information as non-overwriteable. If it is determined in step S14 that the overlap is greater than or equal to the first preset value, then step S18 is performed to mark the second biometric information as overwriteable. The marking method in step S14 can be a flag of 0 or 1 to represent whether the second biometric information is non-overwriteable or overwriteable.

After step S16 or step S18 is completed, step S19 is performed. Step S19 includes registering the second biometric characteristic information. In one embodiment, the operation of registering the second biometric characteristic information includes storing the second biometric characteristic information and a flag representing overwrite or non-overwrite in a memory used to store registered biometric characteristic information.

Marking the second biometric information as non-overwritable means that after the second biometric information is stored in the memory and registered, other biometric information generated subsequently cannot replace or overwrite the second biometric information. Marking the second biometric information as overwritable means that after the second biometric information is stored in the memory and registered, other biometric information generated subsequently can replace or overwrite the second biometric information. The registered second biometric information is used for identity verification.

From the above description, it can be seen that the second biometric feature image will be marked as non-overwriteable only if the overlap between the second biometric feature image and the first biometric feature image is low enough.

The registration method of Figure 2 and the biometric sensing device of Figure 3 can be applied to register fingerprints, but the present invention is not limited to this. Please refer to Figure 4. When registering, the user touches the fingerprint sensor such as sensor 1 with his finger. The first image generated by sensor 1 sensing the fingerprint of the finger is the first fingerprint image. Then sensor 1 senses the fingerprint of the finger again to generate a second fingerprint image. Processor 2 extracts the features of the first fingerprint image to generate a first fingerprint feature information, and stores the first fingerprint feature information to memory 3 for storing fingerprint templates to complete the registration of the first fingerprint image. In one embodiment, the processor 2 marks the first fingerprint feature information as non-overwritable. In step S10, the processor 2 obtains the registered first fingerprint feature information from the memory 3. In step S12, the processor 2 extracts the features of the second fingerprint image to generate a second fingerprint feature information. In step S14, the processor 2 determines whether the overlap degree between the first fingerprint image and the second fingerprint image is less than a first preset value based on the first fingerprint feature information and the second fingerprint feature information. The extraction of features of fingerprint images to generate fingerprint feature information is well known to those skilled in the art of fingerprint sensing and will not be described in detail here. Fingerprint feature information is generated based on fingerprint images, so it is feasible to compare the overlap between two fingerprint images represented by two pieces of biometric feature information. This is also an existing technology and will not be described in detail here.

When step S14 determines that the overlap between the first fingerprint image and the second fingerprint image is less than the first preset value, step S16 is performed to mark the second fingerprint feature information as non-overwriteable. The marking method is to use a flag (Flag) of 0 or 1 to represent that the second fingerprint feature information is non-overwriteable. When step S14 determines that the overlap between the first fingerprint image and the second fingerprint image is not less than the first preset value, step S18 is performed to mark the second fingerprint feature information as overwriteable. The marking method is to use a flag (Flag) of 0 or 1 to represent that the second fingerprint feature information is overwriteable. For example, the first fingerprint image is the fingerprint area 20 in FIG. 4 , and the second fingerprint image is the fingerprint area 22 in FIG. 4 . Step S14 determines that the overlap between the first fingerprint image and the second fingerprint image is less than the first preset value (e.g., 50%), so step S16 is performed to mark the second fingerprint image as non-overwritable. If the second image is the fingerprint area 24 in FIG. 4 , and step S14 determines that the overlap between the first fingerprint image and the second fingerprint image is greater than or equal to the first preset value (e.g., 50%), step S18 is performed to mark the second fingerprint feature information as overwritable.

After marking the second fingerprint feature information in step S16 or S18, the mark representing overwritable or non-overwritable and the second fingerprint feature information are stored in the memory 3 to complete the registration of the second fingerprint feature information, as shown in step S19.

FIG5 provides a second embodiment of the present invention. In FIG5, step S20 includes obtaining a plurality of registered first biometric information, and the plurality of first biometric information respectively corresponds to a plurality of first biometric images. Step S22 includes generating a second biometric information based on the second biometric image. In one embodiment, the plurality of first biometric images and the second biometric image are obtained by sensing the biometrics of a user via the biometric sensing device shown in FIG3. The plurality of first biometric images are generated before the second biometric image. The plurality of first biometric images and the second biometric image are of the same type of biometrics. The method of generating the second biometric information in step S22 may be to extract the features of the second biometric image by an algorithm to obtain the second biometric information.

Step S24 includes determining whether the overlap degree between the second biometric image and each of the plurality of first biometric images is less than a first preset value. As mentioned above, the method for determining the overlap degree between the first biometric image and the second biometric image includes but is not limited to determining whether the overlap area ratio between the first biometric image and the second biometric image is less than a first preset value or determining whether the straight line distance, horizontal distance, vertical distance, or the sum of the horizontal distance and the vertical distance between the center point of the first biometric image and the center point of the second biometric image is greater than a second preset value. In one embodiment, step S24 determines the overlap degree between the second biometric image and each of the first biometric images according to the second biometric information and the first biometric information.

If it is determined in step S24 that the overlap between the second biometric image and each of the plurality of first biometric images is less than a first preset value, then step S26 is performed to mark the second biometric information as non-overwriteable. If it is determined in step S24 that the overlap between the second biometric image and any of the plurality of first biometric images is greater than or equal to the first preset value, then step S28 is performed to mark the second biometric information as overwriteable. The marking method in step S24 can be a flag of 0 or 1 to represent whether the second biometric information is non-overwriteable or overwriteable.

After step S26 or step S28 is completed, step S29 is performed. Step S29 includes registering the second biometric characteristic information. In one embodiment, the operation of registering the second biometric characteristic information includes storing the second biometric characteristic information and a flag representing overwrite or non-overwrite in a memory used to store registered biometric characteristic information.

The registration method of FIG. 5 and the biometric feature sensing device of FIG. 3 can be applied to register fingerprints, but the present invention is not limited thereto. When registering, the user touches a fingerprint sensor such as sensor 1 with a finger. Sensor 1 senses the fingerprint of the finger multiple times to generate multiple first fingerprint images, and then sensor 1 senses the fingerprint of the finger again to generate a second fingerprint image. Processor 2\extracts features of the multiple first fingerprint images to generate multiple first fingerprint feature information, and stores the multiple first fingerprint feature information in memory 3 for storing fingerprint templates to complete the registration of the multiple first fingerprint images. In one embodiment, the processor 2 marks the first first fingerprint feature information of the plurality of first fingerprint feature information as non-overwriteable. In step S20, the processor 2 obtains the plurality of first fingerprint feature information registered from the memory 3. In step S22, the processor 2 extracts the feature of the second fingerprint image to generate a second fingerprint feature information. In step S24, the processor 2 determines whether the overlap degree of each first fingerprint image and the second fingerprint image is less than a first preset value based on the plurality of first fingerprint feature information and the second fingerprint feature information. The extraction of fingerprint image features to generate fingerprint feature information is well known to those skilled in the field of fingerprint sensing and will not be described in detail here. Fingerprint feature information is generated based on fingerprint images, so it is feasible to compare the overlap between the two fingerprint images represented by two biometric feature information, which is also an existing technology and will not be described in detail here.

When step S24 determines that the overlap between each first fingerprint image and the second fingerprint image is less than the first preset value, step S26 is performed to mark the second fingerprint feature information as non-overwriteable. When step S24 determines that the overlap between any first fingerprint image and the second fingerprint image is not less than the first preset value, step S28 is performed to mark the second fingerprint feature information as overwriteable. For example, the first fingerprint image is the fingerprint areas 20, 22 and 24 in FIG. 4, and the second fingerprint image is the fingerprint area 26 in FIG. 4. Step S24 determines that the overlap between each first fingerprint image and the second fingerprint image is less than the first preset value (e.g., 50%), so step S26 is performed to mark the second fingerprint image as non-overwritable. If the first fingerprint image is the fingerprint areas 20, 22 and 26 in FIG. 4, and the second fingerprint image is the fingerprint area 24 in FIG. 4, step S24 determines that the overlap degree between one of the first fingerprint images (e.g., fingerprint area 20) and the second fingerprint image is greater than or equal to the first preset value, and therefore step S28 is performed to mark the second fingerprint feature information as overwritable.

After marking the second fingerprint feature information in step S26 or S28, the mark representing overwritable or non-overwritable and the second fingerprint feature information are stored in the memory 3 to complete the registration of the second fingerprint feature information, as in step S29.

The operation flow of FIG. 2 and FIG. 5 can also be applied to update the biometric information in the memory 3 during identity verification. In this embodiment, after step S12 or step S22, the processor 2 verifies whether the second biometric information has passed the identity verification according to the biometric information registered in the memory 3. In other words, the second biometric image obtained by the sensor 1 must first pass the identity verification before the second biometric information is used to perform the next steps S14 to S19 or S24 to S29 to complete the registration of the second biometric information. If the space for storing the registered biometric information in the memory 3 is full, one of the overwritable biometric information (for example, the biometric information first marked as overwritable) will be removed to store the marked second biometric information.

The above is only an embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the relevant technical field can make some changes or modifications to the technical contents disclosed above into equivalent embodiments within the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

1: sensor 2: processor 3: memory 10: fingertip area 12: finger pulp area 20: fingerprint area 22: fingerprint area 24: fingerprint area 26: fingerprint area S10: step S12: step S14: step S16: step S18: step S19: step S20: step S22: step S24: step S26: step S28: step S29: step

FIG1 shows a user's fingerprint. FIG2 shows a first embodiment of the biometric registration method of the present invention. FIG3 shows an embodiment of the biometric sensing device of the present invention. FIG4 is used to illustrate the method for determining the degree of overlap of biometric images. FIG5 shows a second embodiment of the biometric registration method of the present invention.

S10: Step

S12: Step

S14: Step

S16: Step

S18: Step

S19: Step

Claims (20)

A biometric registration method includes the following steps: a. obtaining a first biometric information to be registered, the first biometric information corresponding to a first biometric image; b. generating a second biometric information according to a second biometric image; c. determining that the overlap between the first biometric image and the second biometric image is less than a first preset value; d. after step c, marking the second biometric information as non-overwriteable; and e. registering the second biometric information. A registration method as described in claim 1, wherein the step c includes determining the degree of overlap based on the first biometric information and the second biometric information. The registration method as described in claim 1, wherein the step c includes determining that the overlapping area ratio of the first biometric image and the second biometric image is less than the first default value. A registration method as described in claim 1, wherein step c includes determining whether a straight line distance, a horizontal distance, a vertical distance, or a sum of the horizontal distance and the vertical distance between a center point of the first biometric image and a center point of the second biometric image is greater than a second preset value. The registration method as described in claim 1, wherein the first biometric image and the second biometric image are fingerprint images. A biometric registration method includes the following steps: a. obtaining a plurality of first biometric information to be registered, wherein the plurality of first biometric information respectively corresponds to a plurality of first biometric images; b. generating a second biometric information according to a second biometric image; c. determining that the degree of overlap between the second biometric image and each of the plurality of first biometric images is less than a first preset value; d. after step c, marking the second biometric information as non-overwriteable; and e. registering the second biometric information. A registration method as described in claim 6, wherein the step c includes determining the degree of overlap between the second biometric image and each of the multiple first biometric images based on the second biometric information and the multiple first biometric information. A registration method as described in claim 6, wherein the step c includes determining that the overlapping area ratio of the second biometric image and each of the plurality of first biometric images is less than the first default value. A registration method as described in claim 6, wherein step c includes determining whether a straight line distance, a horizontal distance, a vertical distance, or a sum of the horizontal distance and the vertical distance between the second biometric image and the center point of each of the plurality of first biometric images is greater than a second preset value. A registration method as described in claim 6, wherein the second biometric image and the plurality of first biometric images are fingerprint images. A biometric sensing device comprises: a memory storing registered first biometric information corresponding to a first biometric image; a sensor for sensing a user's biometrics to generate a second biometric image; and a processor connected to the memory and the sensor for performing the following steps: a. determining that the overlap between the first biometric image and the second biometric image is less than a first preset value; b. after step a, marking the second biometric information as non-overwritable; and c. storing the second biometric information in the memory to register the second biometric information. A biometric sensing device as described in claim 11, wherein the step a includes determining the overlap degree based on the first biometric information and the second biometric information. A biometric sensing device as described in claim 11, wherein the step a includes determining that an overlapping area ratio of the first biometric image and the second biometric image is less than the first preset value. A biometric sensing device as described in claim 11, wherein step a includes determining that a straight line distance, a horizontal distance, a vertical distance, or a sum of the horizontal distance and the vertical distance between a center point of the first biometric image and a center point of the second biometric image is greater than a second preset value. The device as described in claim 11, wherein the sensor is a fingerprint sensor, and the first biometric image and the second biometric image are fingerprint images. A biometric sensing device comprises: a memory storing a plurality of registered first biometric information, wherein the plurality of first biometric information respectively corresponds to a plurality of first biometric images; a sensor for sensing a user's biometrics to generate a second biometric image; and a processor connected to the memory and the sensor for performing the following steps; a. determining that the overlap between the second biometric image and each of the plurality of first biometric images is less than a first preset value; b. after step a, marking the second biometric information as non-overwritable; and c. storing the second biometric information in the memory to register the second biometric information. The biometric sensing device as described in claim 16, wherein step a comprises determining the degree of overlap between the second biometric image and each of the plurality of first biometric images based on the second biometric information and the plurality of first biometric information. A biometric sensing device as described in claim 16, wherein the step a includes determining that an overlapping area ratio of the second biometric image and each of the plurality of first biometric images is less than the first preset value. A biometric sensing device as described in claim 16, wherein step a includes determining that a straight line distance, a horizontal distance, a vertical distance, or a sum of the horizontal distance and the vertical distance between the second biometric image and the center point of each of the plurality of first biometric images is greater than a second preset value. The biometric sensing device as claimed in claim 16, wherein the sensor is a fingerprint sensor, and the plurality of first biometric images and the second biometric image are fingerprint images.