TWI594725B - Portable pupil measuring device and its measuring method - Google Patents

Description

Portable pupil measuring device and measuring method thereof

The invention relates to a portable pupil measuring device and a measuring method thereof, in particular to a method for measuring a distance between a measured pupil and a measured pupil by using a distance measuring unit at each time, and correcting the pupil. The pupil shrinks the aperture in response to the stimulus.

In the current medical system, the hand-held pen lamp used by medical staff does not have the function of pupil identification and pupil value quantification. At present, there are two ways to detect the pupil of the patient, one of which is based on the experience of medical care personnel and is matched with the hand-held type. The pupil mark on the pen lamp is used for judgment, but this cannot provide objective quantitative values for medical personnel other than medical reports and informants, and can only be used as a simple screening tool.

Another way to detect pupils is to use large-volume instruments such as Zimer Opthalmic Systems GALILEI, Octopus101 and LENSTAR LS900. These instruments are fully functional but expensive, if you want to get this product into the general public or It is not practical for medical staff. The NeuroOptics NPi ^TM -100 boring meter and the PLR-200 ^TM boring meter, although with multiple eye detection functions, must be licensed by a doctor, and the unit price is hundreds of thousands of dollars, not readily available. The product.

In view of this, there is still a need for a pupil measuring device that is simple, easy to use, miniaturized, and highly accurate in order to improve the convenience of the first-line medical staff.

The main purpose of the present invention is to provide a portable pupil measuring device and its quantity The measuring method is characterized in that the image capturing unit captures the non-visible image data and the visible light image data of the measured pupil, and measures the distance between the distance measuring unit and the measured pupil by a ranging unit. When calculating the degree of pupil contraction change, the visible light image data is corrected according to the distance difference between the first and second distance information to improve the accuracy of the calculation result.

Another object of the present invention is to provide a portable pupil measuring device, which is provided with a collecting lens capable of controlling an LED illumination half angle at about 20° on a visible light LED and/or an infrared light LED. When the light illuminates the eye, the efficiency of the light source is increased, thereby increasing the resolution of the iris and the pupil.

For the purpose of the present invention, the portable pupil measuring device of the present invention comprises a body, a ranging unit and an image processing unit, wherein the front end of the body is provided with a non-visible light source module and a visible light source. a module and an image capturing unit, wherein the image capturing unit is configured to capture non-visible image data and visible light images of the tested pupil when the non-visible light source module and the visible light source module respectively illuminate a measured pupil The distance measuring unit is configured to: when the image capturing unit captures the non-visible light image data, measure a distance between the distance measuring unit and the measured pupil to generate a first distance information, and capture the image in the image. When the unit captures the visible light image data, the distance between the measured image and the measured pupil is measured to generate a second distance information; and the image processing unit is configured to process the non-visible light image data and the visible light image captured by the image capturing unit. Data, and adjusting the visible light image data according to the difference in distance between the first and second distance information to generate an actual visible light image data, according to Acquired a pupil reaction than the value of the non-visible light imaging data and visible light image of the actual data.

In implementation, the visible light source module includes a visible light LED, and the non-visible light source module includes an infrared light LED.

In implementation, the visible light LED or the infrared light LED is provided with a collecting lens.

In implementation, the non-visible image data includes a pupil diameter of the pupil when the pupil is not stimulated, and the visible image data includes a pupil contraction aperture in response to the stimulation, and the pupil response value includes the pupil diameter of the pupil and the pupil contraction The difference between the apertures.

In implementation, the portable pupil measuring device further includes a storage unit for storing the pupil reaction value, and a display unit for displaying the pupil reaction.

In implementation, the portable pupil measuring device further comprises a data transmission unit for transmitting the invisible image data, the visible light image data, the actual visible light image data and the pupil reaction value to a remote device.

In addition, the present invention also provides a pupil measurement method, comprising the following steps: a) using an image capturing unit to capture a non-visible image data of a measured pupil in response to non-visible light, and measuring the measurement by using a ranging unit; Generating a first distance information from a distance between the unit and the measured pupil, and then processing the invisible image data by using an image processing unit; b) using the image capturing unit to capture visible light in response to visible light in the pupil Image data, using the distance measuring unit to measure the distance between the distance measuring unit and the measured pupil to generate a second distance information, and then processing the visible light image data by using the image processing unit; c) causing the image processing unit to The distance difference between the first and second distance information is adjusted to generate an actual visible light image data, and a non-visible light image data and the actual visible light image data are compared to obtain a pupil reaction value.

In the implementation, the step of comparing the non-visible image data and the actual visible light image data by the image processing unit comprises: a) enhancing the contrast of the image data; b) binarizing the enhanced contrast image data; c) identifying a white pixel block in the binarized image data to define a pupil block, thereby determining a pupil diameter of the pupil when the pupil is invisible, and a pupil contraction aperture when the pupil is responsive to the stimulus; and d Comparing the difference between the original pupil diameter and the pupil contraction aperture to obtain a pupil reaction value.

In order to further understand the present invention, the specific embodiments of the present invention and the effects achieved thereby are described in detail below with reference to the drawings and drawings.

10‧‧‧ Ontology

11‧‧‧Non-visible light source module

111‧‧‧Infrared LED

121‧‧‧ Visible LED

12‧‧‧ Visible light source module

121‧‧‧ Visible LED

13‧‧‧Ranging unit

14‧‧‧Image capture unit

15‧‧‧Substrate

16‧‧‧Collection lens

21‧‧‧Image Processing Unit

211‧‧‧ switch

212‧‧‧ battery module

22‧‧‧ storage unit

23‧‧‧ Data Transfer Unit

24‧‧‧Display unit

30‧‧‧ Cover

FIG. 1 is a schematic diagram showing the internal structure of an embodiment of a portable pupil measuring device according to the present invention.

Fig. 2 is a schematic view showing the appearance of the embodiment of Fig. 1.

Figure 3 is a front end view of the embodiment of Figure 1 before the removal of the cover.

Fig. 4 is a side view of the LED of the embodiment of Fig. 1 and the collecting lens above it.

Figure 5 is a schematic diagram of the calculation architecture of the image processing unit of the embodiment of Figure 1.

Please refer to FIG. 1-3, which is an embodiment of the portable pupil measuring device of the present invention. The front end of the body 10 is provided with a non-visible light source module 11, a visible light source module 12, and a ranging. The unit 13 and an image capturing unit 14 are disposed on the same substrate 15 , wherein the invisible light source module 11 includes an infrared LED 111 , and the visible light The light source module 12 includes a visible light LED 121, and the infrared light LED 111 and the visible light LED 121 are respectively provided with a condensable LED light. a convex light collecting lens 16 (as shown in FIG. 4) having an angle (for example, a light-emitting half angle of the light type is converged at about 20°), and the collecting lens 16 is convex through the perforation provided in the substrate 15. Out of the substrate 15.

The distance measuring unit 13 is disposed on one side of the substrate 15 , and the image capturing unit 14 is disposed under the substrate 15 and captures an image of the front of the body 10 through an opening provided in the center of the substrate 15 . . In addition, the front end of the body 10 is further provided with a cover 30.

An image processing unit 21, a storage unit 22, and a data transmission unit 23 are disposed in the body 10. The rear end of the body 10 is provided with a switch 211 and a battery module 212. The display unit 24 is provided with a display unit 24 on the side thereof. The image processing unit 21 is electrically connected to the invisible light source module 11 , the visible light source module 12 , the distance measuring unit 13 , the image capturing unit 14 , the image processing unit 21 , the switch 211 , the battery module 212 , and the storage unit 22 . Components such as data transfer unit 23 and display unit 24 are controlled to control the operation of the components.

Referring to FIG. 5, in the implementation, the portable pupil measuring device of the present invention is placed about 5 cm in front of a tested pupil, and then the switch 211 is pressed to cause the image processing unit 21 to turn on the infrared light LED 111. The image capturing unit 14 captures the infrared light image data of the measured pupil in response to the infrared light, and uses the distance measuring unit 13 to measure the distance between the distance measuring unit 13 and the measured pupil and generates The first distance information is used by the image processing unit 21 to process the infrared image data.

The image processing unit 21 processes the infrared light image data according to the following steps: a) enhancing contrast of the infrared light image data; b) binarizing the enhanced contrast image data; c) identifying the binary value The white pixel block in the image data is used to define the pupil block, thereby determining the pupil diameter of the pupil when the pupil is responsive to infrared light.

In step a, the contrast of the infrared image data is enhanced according to the following equations (1) and (2): X _inter = X + a * (Xd) (1)

Where X is the grayscale map of the original image, a is a custom parameter, and d is the darkest grayscale value (ie, the lowest grayscale value); X _final = X _inter +| R - GB | (2)

Where R is the value in the red component, and GB is the sum of the values of the green component and the blue component; in step b, the grayscale is first performed on the enhanced contrast image data, and then the median filtering or mean is used. Filtering blurs the grayscaled image data, and then compares the blurred image data with the original image, and binarizes with 0 as the threshold value; in step c, the system first marks the Each white block in the binarized image data records the size position of each block, and then removes the block whose pixel value is lower than 500, and further defines the pupil circle by using the filtered block data. The block, in turn, determines the original pupil aperture when the pupil responds to infrared light.

Then, the image processing unit 21 can be turned on by the light-pressing LED 121 to illuminate the measured pupil, and the image capturing unit 14 can capture the visible light image data of the measured pupil in response to visible light, and utilize the ranging unit. 13 measuring the distance between the distance measuring unit 13 and the measured pupil and generating a second distance information. The image processing unit 21 then processes the visible light image data in the same step as the processing of the infrared light image data, and determines the first and second distance information after determining the pupil shrinkage aperture when the pupil is in response to visible light. The difference in distance (for example, the ratio of the first and second distances) to adjust the size of the pupil contraction aperture to produce an actual pupil contraction aperture, and then to compare the difference between the original pupil aperture and the actual pupil contraction aperture to obtain a pupil reaction The value is stored in the storage unit 22 and displayed on the display unit 24.

In practice, the pupil reaction value stored in the storage unit 22 is more permeable to the capital The material transfer unit 23 transmits the infrared image data, the visible light image data, the original pupil aperture, the actual pupil contraction aperture and the pupil reaction value to a remote device in a wired or wireless manner.

Therefore, the present invention has the following advantages:

1. The concentrating lens disposed above the LED of the present invention can concentrate the beam to improve the resolution of the iris and the pupil, and can achieve a lower driving voltage (for example, the driving brightness can be set to 80%) and the conventional technology. The same lighting effect reduces heat generation and reduces the circuit volume, thereby improving the service life and practicality of the portable pupil measuring device.

2. The present invention uses the distance measuring unit to measure the distance between the non-visible image data and the visible light image data of the measured pupil at the same time, and uses the distance measuring unit to measure the distance between the measured pupil and the measured distance, thereby generating the distance information of the measurement. The subsequently acquired visible light image data and the pupil contraction aperture are corrected to provide a quantified value for the user to quickly determine the degree of contraction change of the measured pupil.

3. The structure of the invention is simple and relatively inexpensive, and the accuracy of the interpretation is high, which can greatly reduce the purchase cost of the medical staff and improve the work efficiency.

In summary, according to the above disclosure, the present invention can achieve the intended purpose of the invention, and provides a method for correcting pupil size by correcting the pupil unit while performing the pupil image acquisition. And provide a quantitative value for the user to clearly understand the degree of pupil contraction, the value of industrial use, and file an invention patent application according to law.

10‧‧‧ Ontology

111‧‧‧Infrared LED

121‧‧‧ Visible LED

14‧‧‧Image capture unit

15‧‧‧Substrate

16‧‧‧Collection lens

21‧‧‧Image Processing Unit

211‧‧‧ switch

212‧‧‧ battery module

22‧‧‧ storage unit

23‧‧‧ Data Transfer Unit

Claims (7)

A portable pupil measuring device comprises: a body having a non-visible light source module, a visible light source module and an image capturing unit at the front end, wherein the non-visible light source module comprises an infrared light LED, the visible light The light source module includes a visible light LED, wherein the infrared light LED and the visible light LED are used to illuminate a measured pupil; and a ranging unit is configured to measure the ranging when the image capturing unit captures the non-visible light image data. a first distance information is generated by the distance between the unit and the measured pupil, and when the visible light image data is captured by the image capturing unit, the distance between the unit and the measured pupil is measured to generate a second distance information; An image processing unit is configured to process the non-visible light image data and the visible light image data captured by the image capturing unit, and adjust the visible light image data according to the difference in distance between the first and second distance information to generate an actual visible light image. The data is obtained by comparing the non-visible image data with the actual visible light image data to obtain a pupil reaction value. The portable pupil measuring device according to claim 1, wherein the visible light LED or the infrared light LED is provided with a single convex collecting lens for controlling the half angle of the LEDs to be about 20 °. The portable pupil measuring device according to claim 1, wherein the non-visible image data comprises a pupil diameter of the pupil when the pupil is not stimulated, and the visible light image data includes a pupil contraction aperture when the pupil responds to the stimulation. And the pupil reaction value includes a difference value between the original pupil diameter and the pupil contraction aperture. The portable pupil measuring device according to claim 1, further comprising a storage unit for storing the pupil reaction value, and a display unit for displaying the pupil reaction. The portable pupil measuring device according to claim 1, further comprising a non-visible image data, visible light image data, actual visible light image data, and pupillary reaction The value is transmitted to the data transfer unit of a remote device. A method for measuring pupil size includes the following steps: a) using an image capturing unit to capture non-visible light image data of a tested pupil in response to non-visible light, and measuring the distance measuring unit and the measured pupil by using a distance measuring unit a first distance information is generated by the distance between the two, and then the non-visible image data is processed by an image processing unit; b) the image capturing unit is used to capture the visible light image data of the measured pupil in response to visible light, and the The distance measuring unit measures a distance between the distance measuring unit and the measured pupil to generate a second distance information, and then processes the visible light image data by using the image processing unit; c) causing the image processing unit to perform the first and second The visible light image data is adjusted by the distance difference of the information to generate an actual visible light image data, and the non-visible light image data and the actual visible light image data are compared to obtain a pupil reaction value. The method for measuring a pupil size according to claim 6, wherein the step of comparing the non-visible image data and the actual visible light image data by the image processing unit comprises: a) enhancing contrast of the image data; b) enhancing contrast The image data is binarized; c) identifying the white pixel block in the binarized image data to define the pupil block, thereby determining the pupil diameter of the pupil when the pupil is invisible, and the pupil responding to the stimulus a pupil contraction aperture; and d) obtaining a pupil reaction value by comparing the difference between the original pupil aperture and the pupil contraction aperture.