TWI640930B - Fingerprint identification device, method and computer program product - Google Patents

Abstract

A fingerprint identification method is to update the parameters required for fingerprint sensing when the sensed fingerprint identification is unsuccessful, and repeat fingerprint sensing and identification according to the updated parameters until a certain number of times and time, so that it can be used every time When the second identification is unsuccessful, the parameters required for fingerprint sensing are dynamically adjusted according to the image collected last time, so as to improve the collection quality of the fingerprint image and increase the unlock success rate.

Description

Fingerprint identification device, method and computer program product

The invention relates to a fingerprint identification device, method and computer program product, in particular to a fingerprint identification device, method and computer program product which can dynamically adjust the parameters of the collected image.

With the rapid development of technology, smart mobile electronic devices such as mobile phones, notebook computers or tablet computers have become essential tools in people's lives. However, although these mobile electronic devices have strong convenience and personalized features, such as: phonebooks, photos, personal cloud drives, personal information passwords, etc., if the mobile electronic device is stolen or lost, its internal The stored information is easy to cause unnecessary losses. Therefore, the use security of mobile electronic devices has become one of the main functions of development.

Fingerprint recognition (Fingerprint Recognition) technology is a commonly used screen unlocking security technology. It unlocks the screen by recognizing the user's fingerprint. Compared with the method of unlocking with a password, it has better security. However, in the existing fingerprint identification technology, only one fingerprint is collected for identification, and the quality of the collected fingerprint image is likely to be too poor, resulting in unrecognizable or identification errors, and the parameters required for fingerprint collection are not dynamically adjusted, so The quality of fingerprint images will not be improved every time, and the problem of poor unlock success rate may easily occur.

Therefore, the object of the present invention is to provide a fingerprint identification method, which is to update the parameters required for sensing a fingerprint when the sensed fingerprint identification is unsuccessful, and to repeatedly perform fingerprint sensing and identification according to the updated parameters until A certain number of times and time.

In one embodiment, the sensed fingerprint recognition is unsuccessful refers to collecting fingerprint image information corresponding to the user's fingerprint according to a fingerprint image acquisition parameter, and then comparing the fingerprint image information with a login image information, If the result of the comparison is not a match, it is deemed that the identification was unsuccessful.

In addition, the parameter required for sensing the fingerprint is the fingerprint image acquisition parameter, and when the sensed fingerprint identification is unsuccessful, the previous fingerprint image acquisition parameter is updated according to the current fingerprint image information collected, and Reset the fingerprint acquisition parameters.

Furthermore, after the fingerprint image acquisition parameters are updated, new fingerprint image information is collected according to the updated fingerprint image acquisition parameters, and then the new fingerprint image information is compared with the login image information, if the comparison result is still If they do not match, the fingerprint acquisition parameters are updated again until a certain number of times and time.

In one embodiment, when fingerprint recognition is unsuccessful, it is first determined whether the number of unsuccessful identifications reaches a certain number of times, and if a certain number of times has been reached, then the identification is not successful Whether the time of success has reached a certain time, if not a certain number of times or not, the parameters required for fingerprint sensing are updated, and fingerprint sensing and identification are repeatedly performed according to the updated parameters.

In one embodiment, when fingerprint recognition is unsuccessful, it is first determined whether the time for unsuccessful identification has reached a certain time. If the time has been reached, then it is determined whether the number of unsuccessful identifications has reached a certain number of times. If the time is not reached, the parameters required for fingerprint sensing are updated, and fingerprint sensing and identification are repeatedly performed according to the updated parameters.

Therefore, another object of the present invention is to provide a computer program product, and after the computer loads the program and executes it, the above fingerprint identification method can be completed.

Therefore, another object of the present invention is to provide a fingerprint identification device, which includes a sensing module and a control module electrically connected to the sensing module. The sensing module collects a correspondence according to a fingerprint image acquisition parameter The fingerprint image information of the user's fingerprint, the control module performs fingerprint identification based on the fingerprint image information, and when the identification is unsuccessful, the fingerprint image acquisition parameters are updated based on the fingerprint image information, and the updated fingerprint image acquisition parameters are based on the updated fingerprint image acquisition parameters Repeat fingerprint collection and identification until a certain number of times and time.

Among them, the control module compares the fingerprint image information with a login image information. If the comparison result is not matched, it is deemed that the identification is unsuccessful.

In one embodiment, the fingerprint recognition device further includes a counting module electrically connected to the control module and a timing module electrically connected to the control module, and the fingerprint recognition is not successful , The control module will first determine whether the count counted by the counting module has reached a certain number of times. If not, the control module controls the counting module to increase the count by one, and updates the fingerprint acquisition parameters according to the fingerprint image information, and Repeat fingerprint collection and identification according to the updated fingerprint image acquisition parameters; if the count has reached a certain number of times, the control module then determines whether the time calculated by the timing module has reached a certain time, if not, the control module controls the timing The module continues timing, and updates fingerprint image acquisition parameters based on fingerprint image information, and repeatedly performs fingerprint acquisition and identification according to the updated fingerprint image acquisition parameters.

In one embodiment, the fingerprint identification device further includes a counting module electrically connected to the control module and a timing module electrically connected to the control module. When the fingerprint recognition is unsuccessful, the control module first determines the timing module. Whether the calculated time reaches a certain time, if it does not reach a certain time, the control module controls the timing module to continue timing, and update the fingerprint image acquisition parameters according to the fingerprint image information, and repeatedly perform the fingerprint acquisition and fingerprint acquisition according to the updated fingerprint image acquisition parameters Identification; if the timing has reached a certain time, the control module then judges whether the number of counts counted by the counting module has reached a certain number of times, if not, the control module controls the counting module to increase the count by one and update based on the fingerprint image information Fingerprint image acquisition parameters, and repeatedly perform fingerprint acquisition and identification according to the updated fingerprint image acquisition parameters.

The effect of the present invention lies in: by dynamically adjusting and updating the parameters required for fingerprint sensing each time the identification is unsuccessful, the quality of fingerprint image collection can be improved and the unlock success rate can be increased.

100‧‧‧Fingerprint identification device

10‧‧‧Display module

20‧‧‧sensor module

30‧‧‧Control module

40‧‧‧Counting module

50‧‧‧Timing module

S10 ~ S50‧‧‧Step

S01 ~ S02‧‧‧Step

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a circuit schematic diagram of an embodiment of the fingerprint identification device of the present invention; FIG. 2 is a method of the fingerprint identification method of the present invention 3 is a flowchart of another embodiment of the fingerprint identification method of the present invention; and FIG. 4 is a flowchart of another embodiment of the fingerprint identification method of the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

Referring to FIG. 1, it is a schematic circuit diagram of a fingerprint identification device 100 of this embodiment. The fingerprint identification device 100 may be any electronic device that requires fingerprint identification to unlock the screen, such as a mobile phone or a tablet computer, which includes a display module 10 and a sensing module. Group 20, a control module 30, a counting module 40 and a timing module 50.

The display module 10 is a screen for displaying images, which may be a liquid crystal screen or a touch screen. The sensing module 20 is used to collect fingerprint image information corresponding to a user's fingerprint according to a fingerprint image acquisition parameter, and the fingerprint image information includes fingerprint graphics, resolution, pixel gray scale, minutiae and other parameters. The control module 30 is electrically connected to the display module 10 and the sensing module 20 to control the operation of all circuits. Counter module 40 electrical connection The control module 30 is used to count the number of fingerprint identifications. The timing module 50 is electrically connected to the control module 30 and is used to calculate the time for fingerprint recognition. The counting module 40 and the timing module 50 can be manufactured on the same chip or circuit.

The fingerprint identification method of this embodiment is applied to the fingerprint identification device 100 or any electronic device, such as a mobile phone, a tablet computer, etc., which uses fingerprint identification to unlock the screen of the electronic device, and when the sensed fingerprint identification is unsuccessful At this time, the system will update the parameters required for fingerprint sensing, and repeat the identification based on the updated parameters until the identification is performed a certain number of times and time or the identification is successful (ie, the screen is unlocked). With reference to FIG. 2, the operation and process of the fingerprint identification method will be described in detail below.

When the user presses a finger to unlock the screen, the fingerprint identification method proceeds to step S10, and the sensing module 20 collects fingerprint image information of the sensing area according to a fingerprint image acquisition parameter to obtain information about the user's fingerprint .

In this embodiment, the sensing area refers to the area pressed by the user's finger on the fingerprint recognition device 100, which may be the Home button on the mobile phone or tablet computer, or the virtual pressing area displayed by the display module 10, etc. . Fingerprint image acquisition parameters refer to the gain adjustment parameters (pixel shift) and pixel control parameters (pixel control) of the sensing module 20, which are used to control the acquisition quality of the fingerprint image to achieve the average brightness of the fingerprint image 128 (that is, the fingerprint image is a 256-level grayscale image), which maximizes the contrast between the valley and ridge lines of the fingerprint. In addition, the fingerprint acquisition parameters currently used by the sensing module 20 are the fingerprint acquisition parameters updated when the previous fingerprint recognition was unsuccessful (as described below) Detailed description), the parameters can be adjusted to the best through each update to improve the quality of the fingerprint image collected and increase the probability of successful identification. Only when the fingerprint identification is performed for the first time, the fingerprint image is based on the preset parameter values Collection.

In step S20, the control module 30 performs fingerprint recognition based on the fingerprint image information collected by the sensing module 20. If the recognition result is successful, the screen is unlocked; if the recognition result is not successful, step S30 is executed.

In detail, the control module 30 compares the fingerprint image information collected by the sensing module 20 with a login image information. If the comparison result is a match, it is regarded as a successful recognition; if it does not match, It is regarded as unsuccessful identification. The login image information refers to the pre-stored fingerprint information when the user wants to enable the fingerprint recognition and unlocking function of the fingerprint recognition device 100, and the information also includes parameters such as fingerprint graphics, resolution, pixel gray scale, feature points, etc. , And the control module 30 compares the feature points in the fingerprint image information and the login image information collected by the sensing module 20, and when the similarity reaches a certain value (for example: 99%), then It is a match (that is, the recognition is successful); otherwise, it is regarded as a mismatch (that is, the recognition is not successful).

In step S30, the control module 30 determines whether the number of retries counted by the counting module 40 reaches a target value. If not, step S40 is executed; if yes, step S50 is executed. In this embodiment, the target value is set twice, but not limited to this.

Step S40, the control module 30 updates the fingerprint image acquisition parameters according to the fingerprint image information collected by the sensing module 20, and resets the fingerprint image acquisition parameters (That is, modify the gain adjustment parameters and pixel control parameters), and the count of the retry count of the counting module 40 is increased by one, and after the setting is completed, the step S10 is returned to, and the sensing module 20 will use the updated fingerprint The image parameters collect the fingerprint image information of the sensing area again.

Therefore, through the above steps S30 and S40, each time fingerprint identification is not successful, the fingerprint image acquisition parameters are corrected, which can achieve the purpose of obtaining higher quality images during the process of acquiring fingerprint image information each time. In addition, the target value is set to 2 times or more, which means that when fingerprint recognition is unsuccessful, the fingerprint recognition device 100 will repeatedly collect fingerprint image information, and fine-tune the fingerprint image acquisition parameters each time The collection quality is improved to increase the success rate of unlocking.

In step S30, if the control module 30 determines that the number of retries counted by the counting module 40 has reached the target value, step S50 is executed, the control module 30 controls the timing module 50 to start timing, and determines that the timing module 50 Whether the timed retry time reaches a target time, if not, step S40 is executed; if so, the fingerprint identification method is ended. In this embodiment, the target time is set to 2 seconds, but not limited to this.

In other words, when fingerprint recognition is unsuccessful and the number of recognitions reaches 2 times, this fingerprint recognition method will change to timing to continue fingerprint recognition, and likewise, every time fingerprint recognition is unsuccessful, the fingerprint drawing parameters are revised to improve the fingerprint The image collection quality increases the success rate of unlocking.

In particular, step S30 and step S50 are fingerprint recognition There are two stages in the recognition method. The first stage uses counting method to ensure repeated identification for a certain number of times; the second stage uses timing method to ensure that the repeated identification time can have a certain length to avoid the simple use of counting method In the case of, there may be a concern that the repeated identification ends within a short period of time due to the influence of the performance of the control module 30 or the speed of calculation execution. In addition, the methods used in the two stages can also be interchanged, that is, the first stage uses the timing method, and the second stage uses the counting method, as shown in Figure 3. The processes in FIG. 3 and FIG. 2 are substantially the same. The difference is that when the control module 30 performs fingerprint recognition based on the fingerprint image information collected by the sensing module 20 (as in step S20), and the recognition result is not successful, the control The module 30 first controls the timing module 50 to start timing, and determines whether the retry time counted by the timing module 50 reaches the target time (such as step S50). If the retry time has reached the target time, the control module 30 determines Whether the number of retries counted by the counting module 40 reaches the target value (as in step S50), so that the quality of fingerprint image collection can also be improved and the unlock success rate can be increased.

In addition, in certain embodiments, some electronic devices are designed to perform fingerprint recognition only when the finger presses the sensing area and lifts the finger. Therefore, before performing fingerprint recognition, it is necessary to additionally determine whether the finger is raised. ,As shown in Figure 4. The process of FIG. 4 and FIG. 2 is roughly the same. The difference is that before fingerprint recognition, the control module 30 will first determine whether it is necessary to wait for the finger to be lifted (such as step S01). It will wait (detect) the finger is raised, when the finger is raised, it will start the fingerprint recognition action (such as steps S10 ~ S50); the control module 30 If it is determined that it is not necessary to wait for the finger to be lifted, fingerprint recognition is directly performed.

It is added that in some specific applications, the fingerprint identification method of the present invention can be presented as a computer program product, so that after the program is loaded and executed by a computer or any electronic device, the fingerprint identification method described above can be executed.

In summary, the fingerprint identification device and method of the present invention, by correcting and updating the parameters required for sensing fingerprints every time identification is unsuccessful, to achieve the purpose of improving the quality of fingerprint image collection and increasing the success rate of unlocking .

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

Claims (11)

A fingerprint identification method is to update the parameters required for fingerprint sensing when the sensed fingerprint identification is unsuccessful, and repeatedly perform fingerprint sensing and identification according to the updated parameters until a certain number and time. The fingerprint identification method according to claim 1, wherein the sensed fingerprint identification is unsuccessful refers to collecting fingerprint image information corresponding to the user's fingerprint according to a fingerprint image acquisition parameter, and then the fingerprint image information and a login The image information is compared, and if the result of the comparison is not a match, it is deemed that the recognition was unsuccessful. The fingerprint identification method according to claim 2, wherein the parameter required for sensing the fingerprint is the fingerprint image acquisition parameter, and when the sensed fingerprint identification is unsuccessful, based on the fingerprint image information collected at the time Update the previous fingerprint image acquisition parameters, and reset the fingerprint image acquisition parameters. The fingerprint identification method according to claim 3, wherein after the fingerprint image acquisition parameters are updated, new fingerprint image information is collected according to the updated fingerprint image acquisition parameters, and then the new fingerprint image information is registered with the login The image information is compared, and if the comparison result is still not matched, the fingerprint image acquisition parameters are updated again until a certain number of times and time. The fingerprint identification method according to claim 1, wherein when fingerprint identification is unsuccessful, it is first determined whether the number of unsuccessful identifications reaches the certain number of times, and if the certain number of times has been reached, then it is determined whether the time of unsuccessful identification is reached At the certain time, if the certain number of times or the certain time is not reached, the parameters required for sensing the fingerprint are updated, and fingerprint sensing and identification are repeatedly performed according to the updated parameters. The fingerprint identification method according to claim 1, wherein when fingerprint identification is unsuccessful, it is first determined whether the unsuccessful time has reached the certain time, and if the certain time has been reached, then the number of unsuccessful identifications is determined For the certain number of times, if the certain number of times or the certain time is not reached, the parameters required for sensing the fingerprint are updated, and fingerprint sensing and identification are repeatedly performed according to the updated parameters. A computer program product. After the computer loads the program and executes it, it can complete the method described in any one of items 1 to 5. A fingerprint identification device includes: a sensing module, collecting fingerprint image information corresponding to a user's fingerprint according to a fingerprint image acquisition parameter; and a control module, electrically connected to the sensing module, the control module is based on The fingerprint image information is used for fingerprint identification. When the identification is unsuccessful, the fingerprint image acquisition parameters are updated according to the fingerprint image information, and the fingerprint acquisition and identification are repeatedly performed according to the updated fingerprint image acquisition parameters until a certain number and time. The fingerprint identification device according to claim 8, wherein the control module compares the fingerprint image information with a login image information, and if the comparison result is not matched, it is deemed that the identification is unsuccessful. The fingerprint identification device according to claim 8, further comprising a counting module electrically connected to the control module and a timing module electrically connected to the control module. When the fingerprint identification is unsuccessful, the control module judges first Whether the count counted by the counting module reaches the certain number of times, if not, the control module controls the counting module to count up by one, and updates the fingerprint image acquisition parameters according to the fingerprint image information, and according to The updated fingerprint image acquisition parameters repeatedly perform fingerprint collection and identification. If the certain number of times has been reached, the control module determines whether the time calculated by the timing module has reached the certain time, if not, the control The module controls the timing module to continue timing, and updates the fingerprint image acquisition parameters based on the fingerprint image information, and repeatedly performs fingerprint acquisition and identification according to the updated fingerprint image acquisition parameters. The fingerprint identification device according to claim 8, further comprising a counting module electrically connected to the control module and a timing module electrically connected to the control module. When the fingerprint identification is unsuccessful, the control module judges first Whether the time calculated by the timing module reaches the certain time, if it does not reach the certain time, the control module controls the timing module to continue timing, and updates the fingerprint image acquisition parameters according to the fingerprint image information, and according to the update The subsequent fingerprint image acquisition parameters repeatedly perform fingerprint collection and identification. If the certain time has been reached, the control module determines whether the number of times counted by the counting module has reached the certain number of times, and if not, the control mode The group controls the counting module to increase the count by one, and update the fingerprint image acquisition parameters based on the fingerprint image information, and repeatedly perform fingerprint acquisition and identification according to the updated fingerprint image acquisition parameters.