TWI550524B - Apparatus and method for processing physiological signal - Google Patents

Description

Physiological signal processing device and method thereof

The present invention relates to an identification device and method, and more particularly to an apparatus and method for identifying physiological features.

In a general composite physiological characteristic identification device, a capacitive sensor is generally used to recognize a fingerprint, a photo-electrical sensor is used to identify a heartbeat frequency and a blood oxygen concentration, and a far-infrared sensor is used to sense a human body temperature. Existing identification devices require corresponding sensors to be set to identify various physiological features. For manufacturers or suppliers, setting up more sensors in the identification device not only increases the complexity of the device architecture, but also increases the cost of materials. Therefore, how to develop better identification equipment is a concern of everyone.

In view of the above, the present invention discloses a physiological signal processing device and a method thereof for improving the effect of identifying physiological features from image signals by controlling different light waves emitted by the light-emitting elements.

Embodiments of the present invention provide a physiological signal processing apparatus. The physiological signal processing device includes a first light emitting element that emits a first light and a second light emitting element that emits a second light, the first light emitting element and the second light emitting element projecting the first light and the second light to provide finger contact The light guide plate, wherein the first light emitting element and the second light emitting element are disposed on the other side of the light guide plate with respect to a finger. Health The signal processing device further includes a light source control module, an image sensing module, and an analysis module. The light source control module is configured to control the first light emitting element and the second light emitting element to emit the first light and the second light. The image sensing module is configured to sense the first light and the second light reflected by the light guide plate to obtain an image signal of the finger. The analysis module is configured to parse the image signal extracted by the first light to obtain a first physiological signal, and parse the image signal extracted by the second light to obtain a second physiological signal, wherein the first physiological signal is different from The second physiological signal mentioned above.

Another embodiment of the present invention provides a physiological signal processing apparatus. The physiological signal processing device comprises a light source group, a light source control module, an image sensing module and an analysis module. The light source group can project a mixed light to a light guide plate for contact with a finger, wherein the light source group is disposed on the other side of the light guide plate with respect to the finger, and the mixed light is composed of a plurality of color gradation lights. The light source control module is coupled to the light source group for controlling the light source group to project light. The image sensing module is configured to sense the mixed light reflected by the light guide plate to obtain an image signal of the finger. The analysis module is coupled to the image sensing module for parsing the image signal extracted by any color gradation to obtain a plurality of physiological signals.

The embodiment of the invention provides a physiological signal processing method suitable for the above physiological signal processing device. The physiological signal processing device includes an image sensing module. The physiological signal processing method includes the following steps. First, at least one first light and one second light are projected. Then, the image sensing module senses the image signal of the finger reflected by the first light and the second light on the light guide plate of the physiological signal processing device. And parsing the image signal to obtain different at least the first physiological signal and the second physiological signal.

Based on the above, the physiological signal processing apparatus and the method thereof according to the embodiments of the present invention can control the light-emitting elements to emit different light waves, and extract the images of the corresponding color gradations in the sensed image signals to identify the physiological features, thereby the embodiment of the present invention can Identifying one or more physiological features of the finger on the same image signal can also generate image signals by using different light waves to improve the accuracy and efficiency of identifying physiological features from the image signal.

In order to further understand the technology, method and function of the present invention in order to achieve the intended purpose, reference should be made to the detailed description and drawings of the invention. The drawings and the annexed drawings are to be considered as illustrative and not restrictive.

10, 30, 40, 50, 60, 70‧‧‧ physiological signal processing device

101a, 301a, 401a, 701a‧‧‧ first light-emitting elements

101b, 301b, 401b, 701b‧‧‧ second light-emitting element

103, 303, 403, 503, 603, 703‧‧‧ image sensing module

105, 305, 405, 505, 605, 705‧‧‧ light source control module

107, 307, 407, 507, 607, 707‧‧ analysis modules

109, 509‧‧‧ fingers

109a, 509a‧‧‧ finger blood vessels

111, 511‧‧‧Light guide plate

309, 409, 609, 709‧‧‧ verification module

311, 411, 611, 711‧‧‧ far infrared sensing module

401c, 701c‧‧‧ third light-emitting element

501, 601, 701‧‧ ‧ light source group

713‧‧‧Near-infrared light-emitting elements

S801~S805‧‧‧Steps

1 is a side elevational view of a physiological signal processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an image signal according to a second embodiment of the present invention.

FIG. 3 is a functional block diagram of a physiological signal processing apparatus according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram showing the configuration of a physiological signal processing apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a side view of a physiological signal processing apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a functional block diagram of a physiological signal processing apparatus according to a sixth embodiment of the present invention.

FIG. 7 is a schematic diagram showing the configuration of a physiological signal processing apparatus according to a seventh embodiment of the present invention.

FIG. 8 is a flowchart of a physiological signal processing method according to an eighth embodiment of the present invention.

In the following, the invention will be described in detail by way of illustration of various exemplary embodiments of the invention. However, the inventive concept may be embodied in many different forms and should not be construed as being limited to the illustrative embodiments set forth herein. In addition, the pattern in the phase The same reference numbers can be used to indicate similar elements.

[Embodiment of Physiological Signal Processing Apparatus]

1 is a side elevational view of a physiological signal processing apparatus according to a first embodiment of the present invention. Referring to FIG. 1 , the physiological signal processing device 10 includes a first light emitting element 101 a , a second light emitting element 101 b , a light source control module 105 , an image sensing module 103 , and an analysis module 107 . The first light-emitting element 101a and the second light-emitting element 101b are respectively coupled to the light source control module 105. The image sensing module 103 is coupled to the analysis module 107. The physiological signal processing device 10 has a light guide plate 111 that provides a user's finger 109 to be in contact therewith. The first light emitting element 101a and the second light emitting element 101b are disposed on the other side of the light guide plate 111 that is in contact with the finger 109.

The first light emitting element 101a may emit a first light, and the second light emitting element 101b may emit a second light. In one example, the first illuminating element 101a and the second illuminating element 101b emit light of different wavelength ranges, such as light of a first wavelength range and light of a second wavelength range. The light source control module 105 can control whether the first light emitting element 101a and the second light emitting element 101b emit light. When the light source control module 105 controls the first light emitting element 101a and the second light emitting element 101b to emit light, the first light and the second light are combined to emit light in the air interface to generate mixed light. For example, the first light-emitting element 101a is a light source that emits green light (having a wavelength of about 495-570 nm), and the second light-emitting element 101b is a light source that emits blue light (having a wavelength of about 450-475 nm), and the mixed light generated is a cyan color seen by the eye. The light. The first light-emitting element 101a and the second light-emitting element 101b are, for example, Light-Emitting Diodes (LEDs).

The light source control module 105 can also control the first light emitting element 101a and the second light emitting element 101b to sequentially emit light. For example, after the first light-emitting element 101a emits green light for a short period of time, the second light-emitting element 101b is controlled to emit blue light in a state where the first light-emitting element 101a is turned off, and green light and blue light are sequentially generated. For another example, after the first light-emitting element 101a emits green light for a short period of time, the second light-emitting element 101b is controlled to emit blue light without turning off the first light-emitting element 101a, and finally the mixed light is generated.

The image sensing module 103 is configured to receive the first light and the second light reflected by the light guide plate 111. In the embodiment in which the first light-emitting element 101a first emits the first light for a period of time, the finger 109 is placed on the light guide plate 111. After the first light is projected on the light guide plate 111, part of the first light is absorbed by the finger 109 and partially reflected. The image sensing module 103 can generate an image signal associated with the finger 109 from the reflected first light. FIG. 2 is a schematic diagram of an image signal according to a second embodiment of the present invention. Referring to FIG. 1 and FIG. 2 simultaneously, the first light-emitting element 101a projects light such as blue light to the light guide plate 111. Since the fingerprint has a peak and a grain, the amount of reflection of the light is different, and the image sensing module 103 captures The first light reflected is obtained as shown in Fig. 2 with a light and dark streak image. Then, with the relevant fingerprint identification algorithm, the fingerprint of the finger 109 can be obtained, and the fingerprint recognition is completed.

In an embodiment in which the first light-emitting element 101a first emits the first light for a period of time and then controls the second light-emitting element 101b to emit the second light, the image sensing module 103 can be mixed by the reflected first light and the second light. The light produces an image signal associated with the finger 109.

The analysis module 107 is configured to parse the image signal to obtain a physiological signal. In the embodiment in which the first light-emitting element 101a first emits the first light for a period of time, the analysis module 107 extracts the image signal having the light of the first wavelength range, and analyzes the image signal having the light of the first wavelength range to obtain the first physiological condition. Signal. After the first light-emitting element 101a first emits the first light for a period of time and then controls the second light-emitting element 101b to emit the second light, the analysis module 107 then extracts the image signal having the light of the second wavelength range, and analyzes the The second physiological signal is obtained by the image signal of the two wavelength range.

Referring to FIG. 1 at the same time, the first light-emitting element 101a emits light of blue light, and the second light-emitting element 101b emits light of green light. The image sensing module 103 captures the light reflected by the blue light rays after the finger 109 is reflected, and simultaneously extracts the light reflected by the green light rays after being projected on the finger blood vessels 109a. The first light-emitting element 101a and the second light-emitting element 101b simultaneously project light, so the image sensing module 103 will obtain a cyan color gradation. The image signal is transmitted to the analysis module 107. The analysis module 107 parses the image signal with the blue color gradation in the image signal, and obtains the fingerprint signal.

The heartbeat frequency of the human body is related to the red blood cell flow rate in the human blood vessels. When the green light rays enter the finger blood vessels 109a, the reflected green light may have a difference in luminous flux due to whether the light passes through the red blood cells. Since the finger blood vessel 109a affects the luminous flux of the blood vessel due to relaxation and compression of the heart, and the finger blood vessel 109a absorbs part of the light to cause the reflected light to change light and dark, the light and dark change can form a correspondence with the heartbeat frequency. By analyzing the periodicity of the luminous flux versus time, the analysis module 107 can calculate the heartbeat frequency of the human body. Therefore, the analysis module 107 can simultaneously parse the image signal with the green color gradation in the image signal, calculate the periodicity of the luminous flux with respect to the time change, and obtain the heartbeat frequency signal. When estimating the heartbeat frequency, the brightness value of the image signal is captured at the sampling time and the corresponding time, and the brightness difference of the image signals before and after is compared to obtain the time difference between two adjacent peaks or two valleys in the image signal. For example, if the brightness value of the image signal is smaller than the brightness value of the previous image signal, the time of the current time is subtracted from the previous time, and the time difference between the wave front and the wave peak can be obtained. After taking a wave time, you can calculate the wave number per minute, which is the number of heartbeats. In another embodiment for calculating the heartbeat frequency, the curve of the brightness value of the image signal and the time axis can be plotted, and the slope of the curve is differentially calculated, and the slope of the curve is up or down, and the curve is A slope of zero represents a wave front or trough. For example, when the slope of the curve changes upwards until the slope of the curve is zero, the slope of the curve is zero, which means the peak; otherwise, when the slope of the curve is downward, and the slope of the curve is zero, the slope of the curve is zero, which means the valley. . Through the above calculation method, the time difference between two adjacent peaks or two valleys in the image signal can be known, that is, when the time of one wave is obtained, the wave number per minute can be calculated, and the heartbeat number can be obtained.

In another embodiment, the first light emitting element 101a or the second light emitting element 101b may be a light source of red or near infrared light. Since the blood oxygen concentration of the human body is related to the concentration of oxygenated hemoglobin in the blood vessel, and the absorption rate of deoxyhemoglobin (Hb) and oxygenated hemoglobin (HbO ₂ ) to infrared or near-infrared light is different, the reflected light flux The difference can be calculated as the blood oxygen concentration.

In this example, the image signal obtained by the image sensing module 103 is, for example, a color or grayscale image. In order to enhance the identification of the physiological signal, the analysis module 107 first captures the specific color gradation of the image signal. For example, if the projected light is green light, the analysis module 107 captures the green light in the image signal to avoid other colors. Interfere with the identification of physiological signals. When analyzing the physiological signal, the analysis module 107 calculates the brightness change caused by the absorption or reflection of the blood or blood vessels by the average brightness of the image signal. The average brightness of the image signal is calculated by considering the value of each pixel as a brightness value. After the analysis module 107 extracts the green light of the image signal, the total pixel value is added as the total brightness of the image signal, and then The average brightness of the image signal is calculated by dividing the total brightness by the number of pixels. Therefore, after comparing the average brightness of the image signal before and after the time, the heartbeat frequency and the blood oxygen concentration can be further estimated.

It is worth mentioning that the physiological signal processing device 10 of the embodiment of the present invention is provided with two light-emitting elements. In actual use, the light-emitting elements can be set as light-emitting elements of blue, green, red and near-infrared light according to requirements. The embodiment of the invention does not limit the combination of the light-emitting elements. However, each wavelength can be specifically applied to the corresponding physiological signal to improve the accuracy of physiological signal recognition.

In addition, the image sensing module 103 can continuously obtain a plurality of image signals for a sampling period, and obtain a time curve of the brightness and darkness of the plurality of image signals to identify the physiological signals. Therefore, the embodiment of the present invention provides that the user can sequentially turn on the first light-emitting element 101a and the second light-emitting element 101b according to actual needs, so that the processing method of the physiological signal is more flexible.

In the embodiment of the present invention, different light rays are used to obtain or identify physiological signals, and the image signals obtained by different light rays (such as light of different wavelength ranges) can enhance and highlight the judgment efficiency of each physiological signal. For example, when recognizing a fingerprint, the use of blue light can provide better judgment, so that the brightness of the reflected light can be more obvious than that of other wavelengths; when the heartbeat frequency is judged, the use of green light can bring Better judgment effect, let the difference of luminous flux be lighter than other wavelengths When the blood oxygen concentration is judged, the light using red light or near-infrared light can bring a better judgment effect, so that the difference of the luminous flux can be more obvious than the light of other wavelengths.

3 is a functional block diagram of a physiological signal processing apparatus according to a third embodiment of the present invention. Referring to FIG. 3, the physiological signal processing device 30 includes a first light emitting element 301a, a second light emitting element 301b, a light source control module 305, an image sensing module 303, an analysis module 307, a verification module 309, and far infrared sensing. Module 311. The first light-emitting element 301a, the second light-emitting element 301b, the light source control module 305, the image sensing module 305 and the analysis module 307 have the same function as the first light-emitting element 101a, the second light-emitting element 101b, and the light source control of FIG. For the module 105, the image sensing module 103, and the analysis module 107, please refer to the above content, and will not be repeated here.

The verification module 309 is coupled to the analysis module 307 and the far infrared sensing module 311. The verification module 309 is configured to determine whether the first physiological signal conforms to the identity data registered in the database. For example, the verification module 309 stores the pre-registered user fingerprint data. When the first physiological signal is a fingerprint signal, the verification module 309 compares the obtained fingerprint signal with the legal user fingerprint data. After the verification module 309 matches the obtained fingerprint signal to the user fingerprint data in the database, the verification module 309 can further trigger an indication such as determining or outputting the second physiological signal.

In addition, the verification module 309 of the embodiment of the present invention may determine the authenticity of the first physiological signal according to the second physiological signal after determining that the fingerprint signal is legal data and obtaining the second physiological signal. For example, the second physiological signal is a heartbeat frequency or a blood oxygen concentration. Although there is a fixed rhythm of healthy or normal heart rate or blood oxygen concentration, there is still a small difference between the rhythm, and the verification module 309 can pass the heartbeat frequency or Whether the blood oxygen concentration is too regular or has a reasonable physiological characteristic to determine whether the second physiological signal is forged. In the case where it is judged that the second physiological signal is forged, the judgment result that the first physiological signal is forged is also obtained. Alternatively, the analysis module 307 cannot obtain the second physiological signal, and the verification module 309 can also determine that the first physiological signal is forged.

The far infrared ray sensing module 311 is used to capture the temperature of the finger. In an example, After the verification module 309 determines that the first physiological signal meets the identity data registered in the database, the far infrared sensing module then initiates sensing of the temperature. The far-infrared sensing module 311 is, for example, a Far Infrared (FIR) sensor that senses far-infrared rays emitted from the human body and measures changes in body temperature for an offset of the reception wavelength.

In addition to simultaneously recognizing or acquiring a plurality of physiological signals, the physiological signal processing device of the embodiment of the present invention can determine the authenticity of the fingerprint signal through the heartbeat frequency or the blood oxygen concentration. As described above, the physiological signal processing apparatus of the embodiment of the present invention not only utilizes specific wavelength light to improve the accuracy of fingerprint recognition, but also avoids the problem of forging fingerprints to pass the verification, thereby improving the security of fingerprint verification.

FIG. 4 is a schematic diagram showing the configuration of a physiological signal processing apparatus according to a fourth embodiment of the present invention. Referring to FIG. 4, the physiological signal processing device 40 includes at least one first light emitting element 401a, at least one second light emitting element 401b, at least one third light emitting element 401c, an image sensing module 403, a light source control module 405, and far infrared rays. The sensing module 407 and the verification module 409. Each of the first light-emitting elements 401a, the second light-emitting elements 401b, and the third light-emitting elements 401c are respectively coupled to the light source control module 405. The analysis module 407 is coupled to the image sensing module 403 and the verification module 409. The verification module 409 is coupled to the far infrared sensing module 407.

The physiological signal processing device 40 is different from the physiological signal processing device 30 in that the physiological signal processing device 40 has three light-emitting elements that can project different light rays, and each of the light-emitting elements can be provided with at least one. Each of the light-emitting elements is disposed on both sides of the physiological signal processing device 40. For example, the first light-emitting element 401a is a blue light-emitting element, the second light-emitting element 401b is a green light-emitting element, and the third light-emitting element 401c is a red light-emitting element. The light source control module 405 can control the illumination of each of the light-emitting elements to generate mixed light, so that the image sensing module 403 obtains the image signal reflected by the mixed light. The analysis module 407 then parses the image signal to obtain three physiological signals. The analysis module 407 analyzes the image signal extracted by the first light (for example, blue light) to obtain the first physiological signal, analyzes the image signal extracted by the second light (for example, green light), and obtains the second physiological signal, and analyzes the third physiological signal. Video signal extracted by light (such as red light) The number gets the third physiological signal. Taking the first light as the blue light, the analysis module 407 first extracts the image signal having only the blue light from the image signal, and then processes the extracted image signal to obtain the first physiological signal.

The physiological signal processing device 40 can simultaneously acquire a plurality of physiological signals, and can also improve the accuracy of identifying the physiological signals by setting a plurality of light emitting elements that emit the same light (such as emitting light of the same wavelength range), thereby avoiding mixing of different light rays. Interference problems caused by analyzing image signals.

[Another embodiment of a physiological signal processing device]

FIG. 5 is a side view of a physiological signal processing apparatus according to a fifth embodiment of the present invention. Referring to FIG. 5 , the physiological signal processing device 50 includes a light source group 501 , a light source control module 505 , an image sensing module 503 , and an analysis module 507 . The light source group 501 is coupled to the light source control module 505. The image sensing module 503 is coupled to the analysis module 507. The physiological signal processing device 50 has a light guide plate 511 that provides a user's finger 109 to be in contact therewith. The light source group 501 is disposed on the other side of the light guide plate 511 that is in contact with the finger 509.

The light source group 501 can project a plurality of light rays, for example, light rays of different wavelength ranges are blue light, green light, and red light. The light source control module 505 can control the light source group 501 to emit a plurality of light rays. The image sensing module 503 senses the light reflected by the light source group 501 after being projected on the light guide plate 511 to obtain an image signal associated with the finger 509, such as the surface skin of the finger 509 or the finger blood vessel 509a. The analysis module 507 can separately analyze the image signals extracted by the respective light sources (for example, extracting the image signals according to different wavelength ranges of light), and generate a plurality of physiological signals accordingly. The light source group 501 is, for example, a three primary color light emitting diode. Please refer to the above for the detailed function of the same component name, which will not be repeated here. In actual operation, the physiological signal processing device 50 can automatically match the appropriate wavelength of the light source according to the requirements of the sensing function to improve the performance of identifying the physiological signal.

6 is a physiological signal processing apparatus according to a sixth embodiment of the present invention. Functional block diagram. Referring to FIG. 6 , the physiological signal processing device 60 includes a light source group 601 , a light source control module 605 , an image sensing module 603 , an analysis module 607 , a verification module 609 , and a far infrared sensing module 611 . The physiological signal processing device 60 is different from the physiological signal processing device 50 in that the physiological signal processing device 60 further includes a verification module 609 and a far infrared sensing module 611. The light source control module 605 is coupled to the light source group 601 and the image sensing module 603. The verification module 609 is coupled to the analysis module 607 and the far infrared sensing module 611. For the detailed function of the remaining identical component names, please refer to the above content, which will not be repeated here.

FIG. 7 is a schematic diagram showing the arrangement of a physiological signal processing apparatus according to a seventh embodiment of the present invention. Referring to FIG. 7 , the physiological signal processing device 70 includes a light source group 701 , a light source control module 705 , an image sensing module 703 , an analysis module 707 , a verification module 709 , a far infrared sensing module 711 , and a near infrared light emitting device . Element 713. The light source group 701 includes a first light emitting element 701a, a second light emitting element 701b, and a third light emitting element 701c. The light source group 701 and the near-infrared light emitting element 713 are both coupled to the light source control module 705. The analysis module 707 is coupled to the image sensing module 703 and the verification module 709. The verification module 709 is coupled to the far infrared sensing module 711.

The light source group 701 is a light-emitting element group that can project one or more light rays, for example, light rays that can emit different wavelength ranges are blue light-emitting elements, green light-emitting elements, and/or red light-emitting elements. The light source group 701 can be controlled by the light source control module 705 to project at least one of blue light, green light, and red light. In another example, the light source group 701 can be used as a white light emitting element by applying a fluorescent material to the blue light emitting element through a packaging technique. In still other examples, the light source set 701 has three light emitting elements, each of which can project light of the same or different wavelength ranges. For example, each of the first light-emitting element 701a, the second light-emitting element 701b, and the third light-emitting element 701c is a white light-emitting element. Alternatively, the first light-emitting element 701a is a blue light-emitting element, the second light-emitting element 701b is a green light-emitting element, and the third light-emitting element 701c is a red light-emitting element. The light source group 701 at this time may be a three-primary light-emitting element, such as three primary colors. Polar body (RGB LED). In actual operation, the first light emitting element 701a, the second light emitting element 701b, and the third light Light element 701c is integrated into a single package. The physiological signal processing device 70 can control the first light-emitting element 701a, the second light-emitting element 701b, and the third light-emitting element 701c to sequentially emit light according to the actual sensing demand. The effect of physiological signals and the reduction in the number of light-emitting elements used.

The light source control module 705 can control the light source group 701 to project different light, such as light of different wavelength ranges or light of different color gradations, such as blue light, green light, red light or white light. In the example in which the light source group 701 is a three primary color light emitting element, the light source control module 705 controls the first light emitting element 701a, the second light emitting element 701b, and the third light emitting element 701c to simultaneously emit blue light, green light, and red light, respectively. Referring to FIG. 5 and FIG. 7 simultaneously, the image sensing module 703 senses the reflected light of the three primary color mixed rays projected on the surface skin of the finger 509 and the finger blood vessel 509a to obtain the original image signal. This original image signal is, for example, an image reflected by white light. The analysis module 707 extracts images of different color gradations in the original image signal, and parses the corresponding physiological signals in the gradation images. For example, the analysis module 707 extracts an image signal having only a blue color gradation in the image signal, and the image signal of the blue gradation is parsed to obtain a fingerprint signal; and the original image signal is extracted to have only a green color. The image signal of the order is analyzed by the image signal of the green level to obtain the heartbeat frequency signal; at the same time, the image signal with only the red level is extracted from the original image signal, and the image signal of the red level is analyzed to obtain blood. Oxygen signal.

The near-infrared light emitting element 713 is for projecting near-infrared light. After the image sensing module 703 obtains the image signal with near-infrared light, the analysis module 705 is provided to analyze the blood oxygen signal. For the detailed function of the remaining identical component names, please refer to the above content, which will not be repeated here.

Therefore, the physiological signal processing device 70 of the embodiment of the present invention can control the light projected by the light source group 701 by the light source control module 705 to increase the efficiency of obtaining the physiological signal. For example, when the light source control module 705 controls the light source group 701 to emit two gradation lights and causes the image sensing module 703 to obtain the image signals reflected by the two gradation lights, The analysis module 707 separately analyzes the image signals extracted by the two color gradations to obtain two physiological signals. In another example, the light control module 705 can also control the light source group 701 to emit three gradation lights to cause the image sensing module 703 to obtain the image signals reflected by the three gradation lights. The analysis module 707 separately analyzes the image signals extracted by the three color gradations to obtain three physiological signals.

It is to be noted that, in the embodiment of the present invention, the light signals of different wavelength ranges or gradations are used to obtain and identify the physiological signals, and the image signals of different color gradations that can be transmitted by the analysis module 707 are enhanced when the physiological signals are recognized. Highlight the judgment efficiency of each physiological signal. For example, when recognizing a fingerprint, using blue or green light can bring better judgment, so that the brightness of reflected light can be more obvious than that of other wavelengths; when judging the heartbeat frequency , the use of blue or green light can bring better judgment, so that the difference in luminous flux can be more obvious than the light of other wavelengths. Therefore, in the embodiment of the present invention, when the light is projected to the finger, the difference of the light in different wavelength ranges is determined, so as to increase the image processing efficiency of the analysis module 707 when identifying the physiological signal.

[Example of Physiological Signal Processing Method]

FIG. 8 is a flowchart of a physiological signal processing method according to an eighth embodiment of the present invention. Referring to FIG. 8, the physiological signal processing method according to the embodiment of the present invention is applied to the physiological signal processing device 60 described above. In step S801, the light source group can project at least two different light rays, such as light of different wavelength ranges or color gradation light, to the light guide plate of the physiological signal processing device. In step S803, the image sensing module then obtains an image signal reflected by the mixed light composed of at least two rays (for example, two wavelength range rays or two color gradation rays) on the light guide plate. In step S805, the analysis module parses the image signal to obtain at least two physiological signals. When the analysis module parses the image signal, it can first capture the light of each wavelength range or the light of a specific wavelength range on the image signal to obtain two color gradation images, and then process the two gradation images separately to obtain two physiological signals. In addition, after the analysis module obtains two physiological signals, the verification module can verify the authenticity of another physiological signal according to one of the physiological signals.

In summary, the physiological signal processing device and the physiological signal processing method according to the embodiments of the present invention control the different light rays projected onto the light guide plate, so that the analysis module analyzes the physiological signals in the image signal, because of different color gradations of the light. It can highlight the characteristics of physiological signals on the image signal and enhance the recognition of physiological signals. Moreover, the physiological signal processing apparatus of the embodiment of the present invention can recognize at least two physiological signals, thereby achieving better identification and anti-counterfeiting functions. In addition, the physiological signal processing device of the embodiment of the present invention encapsulates a plurality of components such as a light-emitting component, an image sensing module, and an analysis module, and has a smaller volume than the existing physiological recognition device, thereby simplifying the module structure and reducing the module structure. Material costs.

The above description is only a possible embodiment of the present invention, and all the equivalent changes and modifications made by the scope of the present invention should be within the scope of the following patent application.

30‧‧‧physical signal processing device

301a‧‧‧First light-emitting element

301b‧‧‧second light-emitting element

303‧‧‧Image Sensing Module

305‧‧‧Light source control module

307‧‧‧Analysis module

309‧‧‧ verification module

311‧‧‧ far infrared sensing module

Claims (20)

A physiological signal processing device includes: a first light emitting element emitting a first light and a second light emitting element emitting a second light, wherein the first light emitting element and the second light emitting element project the first light and The second light is directed to a light guide plate for contact with a finger, wherein the first light emitting element and the second light emitting element are disposed on the other side of the light guide plate opposite to the finger; a light source control module controls the first light The light-emitting element and the second light-emitting element emit the first light and the second light; an image sensing module senses the first light and the second light reflected by the light guide to generate an image signal of the finger And an analysis module, parsing the image signal extracted by the first light to obtain a first physiological signal, and parsing the image signal extracted by the second light to obtain a second physiological signal, wherein the first The physiological signal is different from the second physiological signal. The physiological signal processing device of claim 1, further comprising a verification module, configured to determine whether the first physiological signal conforms to legal identity data, and determine the authenticity of the first physiological signal according to the second physiological signal . The physiological signal processing device of claim 2, further comprising a far-infrared sensing module, wherein the far-infrared sensing module is configured after the verification module determines that the first physiological signal meets the identity data registered in the database The group retrieves the temperature of the finger. The physiological signal processing device according to claim 2, wherein the first light emitting element is a blue light emitting element, a green light emitting element or a white light emitting element, and the second light emitting element is a blue light emitting element, a green light emitting element or a red light emitting element. The physiological signal processing device of claim 3, wherein the first physiological signal is a fingerprint signal or a heartbeat frequency, and the second physiological signal is a fingerprint signal, a heartbeat frequency signal, or a blood oxygen concentration signal. The physiological signal processing device of claim 1, further comprising a third illuminating element The third light-emitting element is controlled by the light source control module to emit a third light, and the first light-emitting element is a blue light-emitting element, the second light-emitting element is a green light-emitting element, and the third light-emitting element is Red light emitting element. A physiological signal processing device includes: a light source group that projects a mixed light to a light guide plate for contact with a finger, wherein the light source group is disposed on the other side of the light guide plate opposite to the finger, the mixed light is composed of a plurality of a light source control module coupled to the light source group to control the light source group to project light; an image sensing module sensing the mixed light reflected by the light guide plate to generate an image signal of the finger And an analysis module coupled to the image sensing module to analyze the image signal extracted by any of the color gradations to obtain a plurality of physiological signals. The physiological signal processing device of claim 7, wherein the light source control module controls the light source group to emit two gradation lights, so that the image sensing module obtains the image signal reflected by the two gradation lights, The analysis module parses the image signal extracted by any of the gradation rays to obtain the two physiological signals. The physiological signal processing device of claim 7, wherein the light control module controls the light source group to emit three gradation lights, so that the image sensing module obtains the image signal reflected by the three gradation lights, The analysis module analyzes the image signal extracted by any of the gradation rays to obtain three physiological signals. The physiological signal processing device of claim 8 or 9, further comprising a verification module, configured to determine whether one of the physiological signals generated by the analysis module conforms to the identity data registered in a database, and Any other physiological signal determines the authenticity of the physiological signal that conforms to the identity data. The physiological signal processing device of claim 10, further comprising a far infrared sensing module, wherein the verification module determines that one of the physiological signals generated by the analyzing module meets the identity data, the far infrared sensation The test module captures the temperature of the finger. The physiological signal processing device according to claim 7, wherein the light source group is a three primary color light emitting diode or a white light emitting diode. A physiological signal processing method is applicable to a physiological signal processing device. The physiological signal processing device includes an image sensing module, and the method includes: projecting at least a first light and a second light; and the image sensing module senses Measuring a video signal reflected by the first light and the second light on a light guide plate of the physiological signal processing device; and analyzing the image signal to obtain at least a first physiological signal and a second physiological signal The first physiological signal is different from the second physiological signal. The method of processing the physiological signal according to claim 13, wherein the step of analyzing the image signal comprises: extracting an image signal having a first wavelength range from the image signal to obtain the first physiological signal, and in the image signal Extracting an image signal having a second wavelength range to obtain the second physiological signal. The method for processing a physiological signal according to claim 14, further comprising: determining the authenticity of the first physiological signal according to the authenticity of the second physiological signal after determining that the first physiological signal is legal identity data. The physiological signal processing method according to claim 15, wherein the authenticity of the second physiological signal is determined by determining whether the second physiological characteristic has a reasonable physiological characteristic. The physiological signal processing method of claim 16, wherein when the second physiological signal is determined to be forged, the first physiological signal is determined to be forged. The physiological signal processing method of claim 16, wherein the first physiological signal is a fingerprint signal, and the second physiological signal is a heartbeat frequency signal or a blood oxygen concentration signal. The physiological signal processing method of claim 18, wherein the obtaining of the heartbeat frequency signal or the blood oxygen concentration signal is calculated according to a brightness value of the image signal captured in a sampling time and a corresponding time. The physiological signal processing method of claim 13, wherein the projecting at least one first light and the second light are respectively transmitted through a first light emitting element and a second light The component is projected or projected through a primary color LED.