TW201800976A - Pressure detecting method, fingerprint authentication method and touch control device - Google Patents

Abstract

A pressure detecting method, a fingerprint authentication method and a touch control device are disclosed. The pressure detecting method includes the following steps: pressing a finger on a surface, capturing fingerprints of the finger and saving the fingerprints as a standard point; pressing the finger on the surface again and capturing fingerprints of the finger; compare gaps of the saved fingerprint and gaps of the captured fingerprint to determine the pressure of the finger exerting on the surface relative to the pressure of the standard point.

Description

Method for detecting the degree of pressing, method for authenticating by fingerprint recognition, and touch device

The present invention relates to a method for detecting the degree of compression and a method for authenticating by fingerprint recognition, and more particularly to a method for determining the degree of compression by detecting a fingerprint interval of a fingerprint image and by comparing fingerprints A method of passing authentication like a fingerprint.

Touch devices such as smart phones, tablets, etc. are often used in daily life, and the touch device operates by touching a certain position of the display screen. At present, a pressure touch technology has been developed to introduce different operation modes for different pressures when the screen is touched.

The existing pressure touch technology is to provide a pressure sensor in the touch device to detect the pressure applied by the user to the touch device during the touch operation to define different operation modes, but in the touch In the structure of the device, a pressure sensor must be used, which increases the cost of equipment construction.

The invention provides a method for detecting the degree of pressing, by taking a fingerprint image and calculating a fingerprint spacing of the fingerprint image to determine the magnitude of the pressure applied when the finger is pressed, as a basis for operation control.

An embodiment of the method for detecting the degree of compression of the present invention includes the steps of: pressing a finger on a pressing surface and capturing and storing a fingerprint image of the finger; pressing the finger on the pressing surface and recording the fingerprint of the finger Data; comparing the fingerprint spacing in the fingerprint data with the fingerprint spacing in the fingerprint image; and determining the degree of compression of the finger to the pressing surface again.

In another embodiment, the step of pressing the finger on the pressing surface and capturing and storing the fingerprint image of the finger further comprises: pressing the finger on the pressing surface at a first pressure and capturing and storing the finger The fingerprint image; the step of pressing the finger on the pressing surface and recording the fingerprint data of the finger further comprises: pressing the finger on the pressing surface with a second pressure and recording the fingerprint data of the finger; determining that the finger is again The step of pressing the pressing surface of the pressing surface further includes: if the fingerprint spacing in the fingerprint data is smaller than the fingerprint spacing in the fingerprint image, determining that the second pressure is greater than the first pressure; if the fingerprint data is in the fingerprint data If the fingerprint spacing is greater than the fingerprint spacing in the fingerprint image, determining that the second pressure is less than the first pressure; and determining that the fingerprint spacing in the fingerprint data is equal to the fingerprint spacing in the fingerprint image, determining The second pressure is equal to the first pressure.

In another embodiment, the step of comparing the fingerprint spacing in the fingerprint data with the fingerprint spacing in the fingerprint image comprises: setting a reference grayscale value; and calculating pixels of the fingerprint image whose grayscale value is less than the reference grayscale value. The quantity is set to the first quantity; the number of pixels in the fingerprint data whose gray scale value is less than the reference gray scale value is calculated and set as the second quantity; and the first quantity and the second quantity are compared; if the first quantity is greater than the second quantity, Determining that the fingerprint spacing of the fingerprint image is smaller than the fingerprint spacing of the fingerprint data; if the first quantity is less than the second quantity, determining that the fingerprint spacing of the fingerprint image is greater than the fingerprint spacing of the fingerprint data; and if the first quantity is equal to the second quantity And determining that the fingerprint spacing of the fingerprint image is equal to the fingerprint spacing of the fingerprint data.

The invention further provides a method for authenticating by fingerprint identification, in addition to the comparison of fingerprint images, the comparison of fingerprint spacing is further increased, and the recognition error rate can be reduced under the confirmation of the double comparison mechanism. Increase security.

An embodiment of the method for authenticating by fingerprint identification of the present invention comprises the steps of: pre-storing a fingerprint image and fingerprint distance information of the fingerprint image; capturing fingerprint data of the fingerprint; calculating a fingerprint in the fingerprint data a spacing; comparing the fingerprint data and the calculated fingerprint spacing with the pre-stored fingerprint image and the fingerprint spacing information; and if the fingerprint data and the calculated fingerprint spacing and the pre-stored fingerprint image And if the fingerprint distance information is met, it is determined that the authentication is passed.

In another embodiment, the fingerprint spacing information includes the number of pixels in the fingerprint image that are below a reference grayscale value.

In another embodiment, the step of calculating the fingerprint spacing in the fingerprint data comprises calculating a number of pixels in the fingerprint data that are lower than the reference grayscale value.

The present invention further provides a touch device that calculates and compares the fingerprint pitch of a fingerprint image when pressed with different pressures as a basis for applying different pressures to the touch device to perform different operating states.

An embodiment of the touch device of the present invention includes: a storage unit, a fingerprint recognition module, and a processing unit. The storage unit pre-stores the fingerprint image of the finger and the fingerprint spacing of the fingerprint image; the fingerprint recognition module is configured to press the finger and capture the fingerprint data of the finger; the processing unit calculates the fingerprint spacing of the fingerprint data, and the The fingerprint spacing of the fingerprint data is compared with the fingerprint spacing of the fingerprint image. If the fingerprint spacing of the fingerprint data is greater than the fingerprint spacing of the fingerprint image, the processing unit enters a first operating mode, if If the fingerprint spacing of the fingerprint data is smaller than the fingerprint spacing of the fingerprint image, the processing unit enters a second operation mode.

In another embodiment, the touch device of the present invention further includes a touch display panel, and the fingerprint recognition module is disposed on the touch display panel.

In another embodiment, the fingerprint recognition module is disposed in a visible area of the touch display panel.

In another embodiment, the fingerprint recognition module is disposed in a non-visible area of the touch display panel.

In another embodiment, when the finger presses the fingerprint recognition module, the fingerprint recognition module detects position information of the finger pressing position.

The invention utilizes the fingerprint spacing of the fingerprint image to calculate the pressure applied to the finger, so that it can be used as a comparison item for fingerprint identification, reduce the error rate of identification and improve safety, and can also be used as pressure touch. The judgment of the operating state does not require additional pressure sensing components, which simplifies equipment construction and reduces costs.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Please refer to FIG. 1, which illustrates an embodiment of a method of detecting the degree of compression of the present invention. The method for detecting the degree of pressing of the invention mainly uses the detection of the fingerprint spacing as the basis for the degree of finger pressing, that is, when the power of the finger pressing is large, the fingerprint spacing is reduced, and the force of the finger pressing is small, which causes the fingerprint spacing to become larger. The detection of the fingerprint spacing can be used to understand the relative degree of finger pressing force.

Before implementing the method for detecting the degree of pressing of the present invention, the fingerprint image corresponding to the reference pressure is first registered, so that the finger is first pressed against the pressing surface and the fingerprint image of the finger is captured and stored. For example, the finger is pressed against the pressing surface by the first pressure and the fingerprint image of the finger is captured and stored. At this time, the finger is in the reference pressing state, and the first pressure is the reference pressure of the pressure finger of the detecting finger. The fingerprint image captured under this first pressure is used as a reference for judging other pressure presses.

In step S1, the finger is pressed against the pressing surface and the fingerprint data of the finger is recorded. For example, the finger is pressed against the pressing surface with the second pressure and the fingerprint data of the finger is recorded, and then proceeds to step S2.

In step S2, the fingerprint spacing in the fingerprint data is compared with the fingerprint spacing in the fingerprint image, and then proceeds to step S3.

In step S3, it is determined whether the fingerprint spacing of the fingerprint data is smaller than the fingerprint spacing in the fingerprint image. If the fingerprint spacing of the fingerprint data is smaller than the fingerprint spacing of the fingerprint image, the process proceeds to step S4, if the fingerprint spacing of the fingerprint data is not smaller than the fingerprint image. The fingerprint pitch of the image proceeds to step S5.

In step S4, it is determined that the second pressure is greater than the first pressure, that is, the degree of pressing of the finger to the pressing surface is large, and then proceeds to step S5.

In step S5, it is determined whether the fingerprint spacing of the fingerprint data is greater than the fingerprint spacing of the fingerprint image. If the fingerprint spacing of the fingerprint data is greater than the fingerprint spacing of the fingerprint image, the process proceeds to step S6, if the fingerprint spacing of the fingerprint data is not greater than the fingerprint image. The fingerprint spacing proceeds to step S7.

In step S6, it is determined that the second pressure is smaller than the first pressure, that is, the degree of pressing of the finger to the pressing surface is smaller.

In step S7, it is determined that the second pressure is equal to the first pressure, that is, the degree of pressing of the finger to the pressing surface is equal to the degree of the first pressing. It should be noted that the so-called second pressure is equal to the first pressure, which means that the difference between the second pressure and the first pressure can be regarded as equal within a predetermined range. For example, the difference between the two is within 5%. If they are equal, the difference is greater than 5% to determine that the second pressure is greater than the first pressure or less than the first pressure.

The fingerprint spacing in the fingerprint data and the fingerprint spacing in the fingerprint image described in the above step S2 are described below with reference to an embodiment.

Referring to FIG. 2, an embodiment of the step of comparing the fingerprint spacing in the fingerprint data with the fingerprint spacing in the fingerprint image in the method for detecting the degree of compression of the present invention is shown. In this embodiment, the grayscale value of each pixel of the fingerprint image is mainly analyzed to determine the size of the fingerprint spacing. When the strength of the finger pressing is greater, the fingertip of the finger will be closer to the pressing surface. The smaller the distance between the fingerprints (ie, the distance between the valleys becomes smaller), so the grayscale value of each pixel of the measured fingerprint image will decrease, and vice versa, so a reference grayscale value is selected first, and then calculated. The grayscale value of the pixel in the fingerprint image is smaller than the number of the reference grayscale value, and the calculated quantity is used as the basis for comparing the fingerprint spacing.

In step S11, a reference grayscale value is first set, for example, the reference grayscale value is set to 25. Then, the process proceeds to step S12.

In step S12, the number of pixels in the fingerprint image whose grayscale value is smaller than the reference grayscale value is calculated and set as the first number, for example, the number of pixels in the fingerprint image whose grayscale value is less than 25 is calculated and set as the first quantity. . Then it proceeds to step S13.

In step S13, the number of pixels in the fingerprint data whose grayscale value is smaller than the reference grayscale value is calculated and set as the second number, for example, the number of pixels in the fingerprint image whose grayscale value is less than 25 is calculated and set as the second number. Then it proceeds to step S14.

In step S14, the first quantity and the second quantity are compared, and then the process proceeds to step S15.

In step S15, it is determined whether the first quantity is greater than the second quantity. If the first quantity is greater than the second quantity, the process proceeds to step S16, and if the first quantity is not greater than the second quantity, the process proceeds to step S17.

In step S16, it is determined that the fingerprint spacing of the fingerprint image is smaller than the fingerprint spacing of the fingerprint data.

In step S17, it is determined whether the first quantity is less than the second quantity. If the first quantity is less than the second quantity, the process proceeds to step S18, and if the first quantity is not less than the second quantity, the process proceeds to step S19.

In step S18, it is determined that the fingerprint spacing of the fingerprint image is greater than the fingerprint spacing of the fingerprint data.

In step S19, it is determined that the fingerprint spacing of the fingerprint image is equal to the fingerprint spacing of the fingerprint data.

The above method for detecting the degree of pressing of the present invention can be applied to a method of passing authentication by fingerprint recognition. Please refer to FIG. 3, which illustrates an embodiment of a method for authenticating by fingerprint identification of the present invention.

In step S21, the fingerprint image and the fingerprint pitch information of the fingerprint image are stored in advance, and the fingerprint pitch information may be, for example, the number of grayscale values of the pixels in the fingerprint image is smaller than the reference grayscale value.

In step S22, the fingerprint data of the finger is retrieved, and then proceeds to step S23.

In step S23, the fingerprint spacing in the fingerprint data is calculated. In the embodiment, the grayscale value of the pixel in the fingerprint data is calculated to be smaller than the reference grayscale value, as the basis of the fingerprint spacing comparison. Then it proceeds to step S24.

In step S24, the fingerprint data and the calculated fingerprint spacing are compared with the pre-stored fingerprint image and the fingerprint spacing information. Next, the process proceeds to step S25.

In step S25, it is determined whether the fingerprint data and the calculated fingerprint spacing match the pre-stored fingerprint image and the fingerprint spacing information. If yes, the process proceeds to step S26, and if not, the process returns to step S22.

In step S26, it is determined that the authentication is passed.

In addition, the above method for detecting the degree of pressing of the present invention can also be applied to pressure touch. Please refer to FIG. 4, which is a system block diagram of an embodiment of a touch device of the present invention. The touch device of the present invention includes a storage unit 20, a fingerprint recognition module 12, and a processing unit 30. The storage unit 20 pre-stores the fingerprint image of the finger and the fingerprint interval of the fingerprint image. The fingerprint recognition module 12 is configured to press the finger and capture the fingerprint data of the finger, and the processing unit 30 calculates the fingerprint spacing of the fingerprint data, and the fingerprint is The fingerprint spacing of the data is compared with the fingerprint spacing of the fingerprint image. If the fingerprint spacing of the fingerprint data is greater than the fingerprint spacing of the fingerprint image, that is, the pressure applied by the finger is less than the reference pressure, the processing unit 30 enters the first operation mode, if the fingerprint The fingerprint spacing of the data is smaller than the fingerprint spacing of the fingerprint image, that is, the pressure applied by the finger is greater than the reference pressure, and the processing unit 30 enters the second operation mode, and the fingerprint spacing of the fingerprint data is equal to the fingerprint spacing of the fingerprint image. In an example, processing unit 30 enters a first mode of operation, in another embodiment, processing unit 30 enters a second mode of operation, and in yet another embodiment, processing unit 30 enters a third mode of operation. The first mode of operation may be, for example, opening an application, the second mode of operation may be, for example, turning on a quick preview command, and the third mode of operation may be, for example, maintaining the original state.

The fingerprint recognition module 12 can be mounted on a touch display panel 10. The touch display panel 10 has a visible area V and a non-visible area NV. In an embodiment, the fingerprint identification module 12 is disposed in the visible area V, such as As shown in FIG. 5, in addition to capturing the fingerprint data of the finger, the touch display panel 10 can also transmit the position information of the finger contact to the processing unit 30. However, in another embodiment, the fingerprint recognition module 12 is disposed in the non-visible area NV, as shown in FIG.

The invention utilizes the fingerprint spacing of the fingerprint image to calculate the pressure applied to the finger, so that it can be used as a comparison item for fingerprint identification, reduce the error rate of identification and improve safety, and can also be used as pressure touch. The judgment of the operating state does not require additional pressure sensing components, which simplifies equipment construction and reduces costs.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and it is intended to be a part of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

10‧‧‧Touch display panel
12‧‧‧Fingerprint Identification Module
20‧‧‧ storage unit
30‧‧‧Processing unit
V‧‧‧visible area
NV‧‧‧ non-visible area
S1-S7‧‧‧ steps
S11-S19‧‧‧Steps
S21-S26‧‧‧Steps

1 is a flow chart of an embodiment of a method of detecting a degree of compression of the present invention. 2 is a flow chart of an embodiment of a step of comparing a fingerprint spacing in a fingerprint data with a fingerprint spacing in a fingerprint image in the method of detecting a degree of pressing according to the present invention. 3 is a flow chart of an embodiment of a method for authenticating by fingerprint identification of the present invention. 4 is a system block diagram of an embodiment of a touch device of the present invention. FIG. 5 is a schematic diagram of an embodiment of a touch device of the present invention. FIG. 6 is a schematic diagram of another embodiment of a touch device of the present invention.

S1-S8‧‧‧ steps

Claims (11)

A method for detecting a degree of pressing, comprising: pressing a finger on a pressing surface and recording fingerprint data of the finger; comparing the fingerprint spacing of the fingerprint data with a fingerprint spacing of a pre-registered fingerprint image, the fingerprint image corresponding to the fingerprint image In a reference pressing state; and determining the degree of pressing of the finger to the pressing surface. The method for detecting the degree of pressing according to the first aspect of the invention, wherein the reference pressing state corresponds to a first pressure; the step of pressing the finger on the pressing surface and recording the fingerprint data of the finger comprises: a second pressure presses the finger on the pressing surface and records the fingerprint data of the finger; the step of determining the degree of pressing the finger to press the pressing surface again comprises: if the fingerprint spacing in the fingerprint data is smaller than the fingerprint Determining the second pressure is greater than the first pressure; and if the fingerprint spacing in the fingerprint data is greater than the fingerprint spacing in the fingerprint image, determining that the second pressure is less than the first pressure And if the fingerprint spacing in the fingerprint data is equal to the fingerprint spacing in the fingerprint image, determining that the second pressure is equal to the first pressure. The method for detecting the degree of pressing according to claim 1, wherein the step of comparing the fingerprint spacing in the fingerprint data with the fingerprint spacing in the fingerprint image comprises: setting a reference grayscale value; calculating the fingerprint The number of pixels in the image whose grayscale value is smaller than the reference grayscale value is set as a first quantity; calculating the number of pixels in the fingerprint data whose grayscale value is smaller than the reference grayscale value and setting the second number; and comparing Determining, by the first quantity, the second quantity; if the first quantity is greater than the second quantity, determining that the fingerprint spacing of the fingerprint image is smaller than the fingerprint spacing of the fingerprint data; if the first quantity is less than the second quantity Determining that the fingerprint spacing of the fingerprint image is greater than the fingerprint spacing of the fingerprint data; and if the first quantity is equal to the second quantity, determining that the fingerprint spacing of the fingerprint image is equal to the fingerprint spacing of the fingerprint data . A method for authenticating by fingerprint identification, comprising: pre-storing a fingerprint image and fingerprint distance information of the fingerprint image; capturing fingerprint data of the finger; calculating a fingerprint spacing in the fingerprint data; Calculating the fingerprint spacing is compared with the pre-stored fingerprint image and the fingerprint spacing information; and if the fingerprint data and the calculated fingerprint spacing are consistent with the pre-stored fingerprint image and the fingerprint spacing information, Then the pass is authenticated. The method of authenticating by fingerprint identification as described in claim 4, wherein the fingerprint spacing information includes the number of pixels in the fingerprint image that are lower than a reference grayscale value. The method for authenticating by fingerprint identification as described in claim 5, wherein the step of calculating a fingerprint spacing in the fingerprint data comprises: calculating a number of pixels in the fingerprint data that are lower than the reference grayscale value . A touch device includes: a storage unit pre-storing a fingerprint image of a finger and a fingerprint distance of the fingerprint image; a fingerprint recognition module for pressing and extracting fingerprint data of the finger; and a processing unit Calculating the fingerprint spacing of the fingerprint data, and comparing the fingerprint spacing of the fingerprint data with the fingerprint spacing of the fingerprint image. The touch device of claim 7, wherein if the fingerprint spacing of the fingerprint data is greater than the fingerprint spacing of the fingerprint image, the processing unit enters a first operation mode, if the fingerprint data If the fingerprint spacing is less than the fingerprint spacing of the fingerprint image, the processing unit enters a second mode of operation. The touch device of claim 7, wherein if the fingerprint data and the calculated fingerprint spacing match the pre-stored fingerprint image and the fingerprint spacing information, the authentication is determined. The touch device of claim 7, further comprising a touch display panel, wherein the fingerprint recognition module is disposed on the touch display panel. The touch device of claim 7, wherein when the finger presses the fingerprint recognition module, the fingerprint recognition module detects position information of the finger press.