TW202101283A - Optical fingerprint sensing method, fingerprint identification device and information processing device capable of adjusting the fingerprint exposure intensity according to the light intensity of the external environment - Google Patents

Abstract

An optical fingerprint sensing method includes the steps of using a light sensing unit to detect the light intensity of the external environment and generating a brightness sensing value according to the light intensity; using a comparison control unit to compare the brightness sensing value with a threshold interval so as to generate a control signal, wherein the control signal will present a first state when the brightness sensing value is less than the lower limit value of the threshold interval, the control signal will present a second state when the brightness sensing value is in the threshold interval, and the control signal will present a third state when the brightness sensing value is greater than the upper limit value of the threshold interval; and using a light source unit to generate a corresponding light source to illuminate a fingerprint collecting area according to the control of the control signal. The light source has a first brightness when the control signal presents the first state, the light source has a second brightness when the control signal presents the second state, and the light source has a third brightness when the control signal presents the third state, wherein the third brightness is greater than the second brightness and the second brightness is greater than the first brightness. The optical fingerprint sensing method further includes a step of using an image sensing unit to sense the light reflected by the fingerprint collecting area to collect a fingerprint image. The optical fingerprint sensing method further includes a step of using a processor to perform an identification process on the fingerprint image to generate a recognition result and adjust the threshold interval according to the recognition result. Thus, the optical fingerprint sensing method of the present invention can adjust the fingerprint exposure intensity of the fingerprint collecting area according to the light intensity of the external environment so as to save the power consumption and improve the fingerprint imaging quality.

Description

Optical fingerprint sensing method, fingerprint identification device and information processing device

The invention relates to an optical fingerprint sensing method, in particular to an optical fingerprint sensing method that adjusts the fingerprint exposure intensity according to the light intensity of the external environment.

Science and technology are changing with each passing day, and the importance of information security is also increasing day by day in a society that has become more mature in technological development. In order to effectively prevent information or related electronic devices from being stolen or misappropriated, many security software or devices related to information security have been proposed one after another.

Among them, the fingerprint recognition technology has been widely used in mobile terminal equipment. Users can use the fingerprint recognition device to wake up the device and secure payment, which greatly improves the convenience and security of the user. At present, due to the high demand of users for the proportion of terminal screens, optical fingerprint recognition devices have become one of the main security devices today.

In the application of fingerprint recognition, although the existing technology can effectively recognize a user's fingerprint in normal ambient light, when the brightness of the ambient light becomes large, the imaging quality of the fingerprint is likely to deteriorate; in addition, When the brightness of the ambient light becomes very weak, imaging with the same exposure intensity will cause waste of power consumption.

Therefore, a novel optical fingerprint sensing method is urgently needed in the art.

One purpose of the present invention is to provide an optical fingerprint sensing method, which can adjust the exposure intensity of a fingerprint collection area according to the intensity of ambient light, so as to achieve the effects of saving power consumption and improving fingerprint imaging quality.

Another object of the present invention is to provide an optical fingerprint sensing method that can feed back the fingerprint recognition result to a light source intensity adjustment mechanism to optimize the imaging quality of the fingerprint.

Another object of the present invention is to provide a fingerprint identification device, which can adjust the exposure intensity of a fingerprint collection area according to the intensity of ambient light, so as to achieve the effects of saving power consumption and improving fingerprint imaging quality.

Another object of the present invention is to provide a fingerprint identification device which can feed back the fingerprint identification result to a light source intensity adjustment mechanism to optimize the imaging quality of the fingerprint.

Another object of the present invention is to provide an information processing device, which can adjust the exposure intensity of a fingerprint collection area according to the intensity of the ambient light, so as to save power consumption and improve the quality of fingerprint imaging.

Another object of the present invention is to provide an information processing device that can feed back fingerprint recognition results to a light source intensity adjustment mechanism to optimize the imaging quality of fingerprints.

To achieve the aforementioned purpose, an optical fingerprint sensing method is proposed, which includes:

Use a light sensing unit to detect the light intensity of the external environment and generate a brightness sensing value according to the light intensity;

A comparison control unit is used to compare the brightness sensing value with a threshold interval to generate a control signal, wherein when the brightness sensing value is less than the lower limit of the threshold interval, the control signal assumes a first state , When the brightness sensing value is in the threshold interval, the control signal will assume a second state, and when the brightness sensing value is greater than the upper limit of the threshold interval, the control signal will assume a third state ；

A light source unit is controlled by the control signal to generate a light source to illuminate a fingerprint collection area, wherein when the control signal presents the first state, the light source has a first brightness, and when the control signal presents In the second state, the light source will have a second brightness, and when the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the first brightness Brightness; and

An image sensing unit is used to sense the light reflected by the fingerprint collection area to collect a frame of fingerprint image.

In one embodiment, the optical fingerprint sensing method further includes: using a processor to perform a recognition process on the frame of fingerprint images to generate a recognition result, and adjusting the threshold interval according to the recognition result.

To achieve the foregoing objective, the present invention further provides a fingerprint identification device, which has: a light sensing unit for detecting the light intensity of the external environment and generating a brightness sensing value according to the light intensity;

A comparison control unit for comparing the brightness sensing value with a threshold interval to generate a control signal, wherein when the brightness sensing value is less than the lower limit of the threshold interval, the control signal will present a first A state, when the brightness sensing value is in the threshold interval, the control signal will present a second state, and when the brightness sensing value is greater than the upper limit of the threshold interval, the control signal will present a first state Three states

A light source unit for generating a light source to illuminate a fingerprint collection area under the control of the control signal. When the control signal presents the first state, the light source has a first brightness. When presenting the second state, the light source will have a second brightness, and when the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the First brightness; and

An image sensing unit for sensing the light reflected by the fingerprint collection area to collect a frame of fingerprint image.

In one embodiment, the fingerprint recognition device further has a processor for performing a recognition process on the frame of fingerprint image to generate a recognition result, and adjust the threshold interval according to the recognition result.

In addition, the present invention discloses an information processing device, which has a central processing unit and the aforementioned fingerprint identification device, wherein the central processing unit is used to communicate with the fingerprint identification device.

In a possible embodiment, the information processing device is a smart phone or a portable computer device.

In order to enable your reviewer to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are attached as follows.

Please refer to FIG. 1, which is a schematic diagram of an embodiment of the fingerprint identification device of the present invention, which can be applied to smart phones, tablet computers, notebook computers or other mobile terminal devices. As shown in FIG. 1, the fingerprint identification device includes a light source unit 10, a screen 20, a light sensing unit 30, a comparison control unit 40, and an image sensing unit 50. The light source unit 10 is used to provide The light source reaches the screen 20 to illuminate a fingerprint collection area, the intensity of the light source is controlled by the comparison control unit 40; the screen 20 is used to provide the fingerprint collection area; the light sensing unit 30 is used to detect the light intensity of the external environment , And generate a brightness sensing value 31 according to the light intensity; the comparison control unit 40 is used to compare the brightness sensing value 31 with a threshold interval 41 to generate a control signal; and the image sensing unit 50 is used The light reflected by the fingerprint collection area is sensed to collect a frame of fingerprint image.

Please refer to FIG. 2, which shows a flowchart of an embodiment of the optical fingerprint sensing method of the present invention, which is implemented using the fingerprint identification device of FIG. 1. As shown in FIG. 2, the processing method includes: using a light sensing unit 30 to detect the light intensity of the external environment and generating a brightness sensing value 31 according to the light intensity (step a); using a comparison control unit 40 to compare the brightness sensing value 31 The control signal is compared with a threshold interval 41 to generate a control signal. When the brightness sensing value 31 is less than the lower limit of the threshold interval 41, the control signal will assume a first state. When the brightness sensing value 31 is in the threshold interval 41 In the middle, the control signal will assume a second state, and when the brightness sensing value 31 is greater than the upper limit of the threshold interval 41, the control signal will assume a third state (step b); The control signal control generates a light source to illuminate a fingerprint collection area, wherein when the control signal presents the first state, the light source has a first brightness, and when the control signal presents the second state, the The light source will have a second brightness, and when the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the first brightness (step c); The image sensing unit 50 senses the light reflected by the fingerprint collection area to collect a frame of fingerprint image (step d); uses a processor to perform a recognition procedure on the frame of fingerprint image to generate a recognition result, and The recognition result adjusts the threshold interval 41 (step e).

That is, when the user presses a finger on the fingerprint collection area on the screen 20 to perform fingerprint recognition, the fingerprint recognition device of the present invention first detects the light intensity of the external environment and adjusts the brightness of the light source according to the light intensity , So that the image sensing unit 50 can sense a clearer fingerprint image. In addition, the fingerprint recognition device of the present invention can also use the recognition result of the frame of the fingerprint image as feedback information to adjust the threshold interval 41, thereby automatically optimizing the sharpness of the fingerprint image.

Based on the above description, the present invention further provides an information processing device. Please refer to FIG. 3, which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 3, an information processing device 100 has a central processing unit 110 and a fingerprint identification device 120. The fingerprint identification device 120 is implemented by the fingerprint identification device of FIG. 1, and the central processing unit 110 is used for Communicate with the fingerprint recognition device 120. In addition, the information processing device 100 can be a smart phone or a portable computer device.

Therefore, with the technical solutions disclosed above, the present invention can provide the following advantages:

1. The optical fingerprint sensing method of the present invention can adjust the exposure intensity of a fingerprint collection area according to the intensity of ambient light, so as to achieve the effects of saving power consumption and improving fingerprint imaging quality.

2. The optical fingerprint sensing method of the present invention can feed back the fingerprint recognition result to a light source intensity adjustment mechanism to optimize the imaging quality of the fingerprint.

The disclosure in this case is a preferred embodiment, and any partial changes or modifications that are derived from the technical ideas of the case and can be easily inferred by those who are familiar with the art do not deviate from the scope of the patent right of the case.

In summary, regardless of the purpose, means or effect of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. I implore the examiner to check it out and pray for the patent to be granted as soon as possible. To benefit society is to pray for the most.

10: Light source unit 20: screen 30: light sensor unit 31: Brightness sensing value 40: Comparison control unit 41: threshold interval 50: Image sensing unit 100: Information processing device 110: Central Processing Unit 120: Fingerprint recognition device Step a: Use the light sensing unit to detect the light intensity of the external environment and generate a brightness sensing value according to the light intensity Step b: Use the comparison control unit to compare the brightness sensing value with a threshold interval to generate a control signal, wherein when the brightness sensing value is less than the lower limit of the threshold interval, the control signal will assume a first state, when When the brightness sensing value is in the threshold interval, the control signal will assume a second state, and when the brightness sensing value is greater than the upper limit of the threshold interval, the control signal will assume a third state Step c: Make the light source unit generate a light source to illuminate a fingerprint collection area under the control of the control signal, wherein when the control signal presents the first state, the light source will have a first brightness, and when the control signal When presenting the second state, the light source will have a second brightness, and when the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the First brightness Step d: Use the image sensing unit to sense the light reflected by the fingerprint collection area to collect a frame of fingerprint image Step e: Use a processor to perform a recognition procedure on the frame of the fingerprint image to generate a recognition result, and adjust the threshold interval according to the recognition result

FIG. 1 is a schematic diagram of an embodiment of the fingerprint identification device of the present invention. Fig. 2 shows a flowchart of an embodiment of the optical fingerprint sensing method of the present invention. Fig. 3 shows a block diagram of an embodiment of the information processing device of the present invention.

Step a: Use the light sensing unit to detect the light intensity of the external environment and generate a brightness sensing value according to the light intensity

Step b: Use the comparison control unit to compare the brightness sensing value with a threshold interval to generate a control signal, wherein when the brightness sensing value is less than the lower limit of the threshold interval, the control signal will assume a first state, when When the brightness sensing value is in the threshold interval, the control signal will assume a second state, and when the brightness sensing value is greater than the upper limit of the threshold interval, the control signal will assume a third state

Step c: Make the light source unit generate a light source to illuminate a fingerprint collection area under the control of the control signal, wherein when the control signal presents the first state, the light source will have a first brightness, and when the control signal When presenting the second state, the light source will have a second brightness, and when the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the First brightness

Step d: Use the image sensing unit to sense the light reflected by the fingerprint collection area to collect a frame of fingerprint image

Step e: Use a processor to perform a recognition procedure on the frame of the fingerprint image to generate a recognition result, and adjust the threshold interval according to the recognition result

Claims (6)

An optical fingerprint sensing method, which includes: using a light sensing unit to detect the light intensity of the external environment and generating a brightness sensing value according to the light intensity; using a comparison control unit to compare the brightness sensing value with a threshold interval Compare to generate a control signal, wherein when the brightness sensing value is less than the lower limit of the threshold interval, the control signal will assume a first state, and when the brightness sensing value is in the threshold interval, the The control signal will assume a second state, and when the brightness sensing value is greater than the upper limit of the threshold interval, the control signal will assume a third state; enable a light source unit to generate a light source under the control of the control signal To illuminate a fingerprint collection area, wherein when the control signal presents the first state, the light source will have a first brightness, and when the control signal presents the second state, the light source will have a second brightness When the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the first brightness; and an image sensing unit is used to sense the fingerprint The light reflected by the collection area is used to collect a frame of fingerprint image. For example, the optical fingerprint sensing method described in item 1 of the scope of patent application further includes: using a processor to perform a recognition process on the frame of fingerprint image to generate a recognition result, and adjust the threshold interval according to the recognition result. A fingerprint identification device, which has: a light sensing unit for detecting the light intensity of the external environment and generating a brightness sensing value according to the light intensity; a comparison control unit for comparing the brightness sensing value with a threshold value The interval is compared to generate a control signal, wherein when the brightness sensing value is less than the lower limit of the threshold interval, the control signal will assume a first state, and when the brightness sensing value is in the threshold interval, The control signal will assume a second state, and when the brightness sensing value is greater than the upper limit of the threshold interval, the control signal will assume a third state; a light source unit is used for control according to the control signal Generate a light source to illuminate a fingerprint collection area, wherein when the control signal presents the first state, the light source will have a first brightness, and when the control signal presents the second state, the light source will have a The second brightness, when the control signal presents the third state, the light source will have a third brightness, and the third brightness>the second brightness>the first brightness; and an image sensing unit for The light reflected by the fingerprint collection area is sensed to collect a frame of fingerprint image. For example, the fingerprint recognition device described in item 3 of the scope of patent application further has a processor for performing a recognition procedure on the frame of fingerprint image to generate a recognition result, and adjust the threshold interval according to the recognition result. An information processing device, which has a central processing unit and the fingerprint identification device as described in any one of items 3 to 4 of the scope of patent application, wherein the central processing unit is used to communicate with the fingerprint identification device. For example, the information processing device described in item 5 of the scope of patent application is a smart phone or a portable computer device.

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