CN102657511A - Visual measuring system having digital sighting target and voice recognition characteristic - Google Patents

Abstract

The visual measurement system with the features of digital visual mark and voice recognition is a visual measurement method supported by computer multimedia system. Its core technology is composed of visual mark display unit, voice acquisition unit and measurement data processing unit to form a circular processing flow of vision detection data collection, calculation, control and so on. Random transformations of five digital dimensions of 3, 5, 6, 8, and 9 appear on the optotype display unit each time. The optotype size matches the logarithmic international vision testing standard. The tester reads out the observed digital optotype according to his own vision ability; the voice acquisition unit sends the detection data to the multimedia data processing unit for cyclic processing, and obtains the real vision value of the subject. The visual measurement method with the features of digital visual mark and voice recognition increases the fun of the visual inspection process, simplifies the visual measurement process, produces a good stimulus response to visual care, and helps people to protect visual health.

Description

A Vision Measuring System with Digital Visual Mark and Voice Recognition Features

technical field

The invention discloses a visual measurement system and method with digital visual mark and voice recognition features. Its content involves the fields of international standard vision detection methods, computer multimedia technology and Internet of Things application technology.

Background technique

The normal development of the human eye is from oblate to round, from short to long, from small to large, from high hypermetropia to emmetropia. Before the age of 6 is the rapid development of vision: the eyes of newborn babies are mostly flat and round, which are much shorter than those of adults, so they are in a state of high hyperopia, so their vision is very weak, and they can only distinguish between light and shadow; At one year old after birth, they can only distinguish relatively large objects at close distances; at the age of 1-5, the eyeballs develop very rapidly, and their volume and front-to-back diameter increase and elongate significantly, and their vision rises linearly; generally at the age of 6, the eyeballs The volume is close to the normal size, and the vision is close to the normal level. This provides the necessary conditions for enrollment and understanding of external things. 7-20 years old is the visual plasticity period: the development of eyeballs usually takes about 20 years old to be finalized. Before it is finalized, the plasticity of the eyeball is very large, so it has a duality. It is easy to develop myopia, and it is also beneficial to the prevention and treatment of myopia. Therefore, various measures to prevent myopia must be carried out during this period in order to receive the ideal result. Effect. Once the eyeball is shaped, it is not easy to change it.

Visual acuity, also known as central vision, reflects the visual function of the central fovea of the macula. The vision beyond 5 meters is called distance vision, and the vision when reading at 25 cm is called near vision. To resolve two points, two cone cells must be excited in the retina separated by at least one inactive cone cell. The diameter of the pyramidal cells in the fovea of the macula is 1-1.5 microns. The resolution of the normal human eye is 1' angle of view, which is equivalent to a distance of 4.96 microns on the retina. The eye chart is designed according to this principle. Angle of view refers to the angle formed by the light rays reflected at both ends of the external object passing through the intersection of nodes. The larger the object, the larger the viewing angle. The farther away the object is, the smaller the viewing angle becomes. For example: (1) 5-point record L: 5-point record expresses visual acuity by subtracting the logarithm of visual angle from 5 points. If expressed in a formula, it is: L=5-lgα; (2) Decimal record V: in terms of visual angle The reciprocal expresses visual acuity, and the visual angle unit is (′) (minutes). Expressed in formula: V=1/α. There are two kinds of eye chart graphics commonly used at present, C shape and E shape, and each kind of figure stroke is 1 ' angle of view, and each kind of figure contains 5 ' angle of view.

For the visual acuity test method, when checking distance vision, the test distance is 5 meters, the eye chart should be placed at a height of 1.0 (or logarithmic vision chart 5.0) and the visual mark should be parallel to the subject's eyes, and the illumination should be appropriate. Visual acuity checks are generally done right first, then left, with both eyes separately. While examining one eye, the other eye can be covered with a blindfold. The examinee's eyes must be wide open, and they must not squint, squint, or tilt their head. When checking, point to the optotype from top to bottom. If the answer is correct, point to the next line of optotype. The recognition speed averages 3 to 5 seconds per word. Record the visual acuity value next to the last row of optotypes for which the answer is correct. If you can’t see the 4.0 visual mark clearly at 5 meters, you should gradually approach the eye chart, and record the distance at which you can see the 4.0 visual mark clearly at first, press (D is the distance that the normal eye should see for the 4.0 visual mark, and d is The distance between the person being checked and the eye chart) calculates the visual acuity being checked. If you still can’t see the 4.0 visual mark at 1 meter from the eye chart, you can use the method of identifying the fingers in front of you to measure your visual acuity. From far to near, you can record the visual acuity according to the distance where you can see the index of the finger at the beginning. If you are close to 5 cm, you still can’t see clearly For finger counting, change the whole hand to swing in front of your eyes, and record the distance that you can see the hand swing clearly at a distance of 30 cm to 5 cm. If you can't distinguish the manual, you can project light on your eyes in a dark room to check whether there is light perception and whether you can judge the direction of light projection. Such as loss of light perception is total blindness.

At present, existing vision training instruments or standard vision testing systems at home and abroad all have multiple defects that are not suitable for children's vision training. Its shortcomings are described as follows:

Although there are several sets of combination schemes for the orientation symbol E printed on the existing visual acuity test form or watch box, for each visual acuity test form or watch box, the position of the orientation symbol E is fixed. In the process of vision training, it often happens that the examinee is familiar with the position of the azimuth symbol E of the entire vision chart, and it is easy to deal with the examiner. The effect of vision exercise is not good, and it cannot accurately reflect the examinee Vision condition.

Currently, there are two commonly used eye chart optotype graphics, E-shaped and C-shaped, but these two types of graphics are too rigid. Compared with digital optotypes, they are not easy to be accepted by children because they lack interest, and are not conducive to long-term vision maintenance. exercise.

In recent years, my country's Intellectual Property Office has successively published reports on "vision training systems", among which the patent "Interactive gaze training system and method" (CN101084857) proposes a method of The vision training program for the input of the game handle, the system projects 4-8 small windows each independently operated by a game handle on the projection screen, and the visual targets in the small windows are continuously reduced under the control of the computer. Although this program can achieve the effect of vision exercise, it cannot allow the examinee to know his vision status at any time. This solution includes computers, projectors, projection screens, game controllers and other equipment. Projectors with better display effects are expensive and should not be popularized in ordinary families. Moreover, these devices are connected by wires, and the wiring is complicated.

Through Internet information retrieval, my country Intellectual Property Office's public patent literature retrieval and my country's library collection electronic literature (CNKI) retrieval, no solution to the above problems related to the application of "visual measurement method with digital visual mark and voice recognition features" was found. Reports or records of techniques and methods.

Contents of the invention

The purpose of the invention is to solve the problems of technical defects such as fixed detection signal, rigidity and inconvenient multimedia data processing existing in the existing vision detection method. While the subjects are testing their own eyesight, it can achieve the purpose of protecting eyesight and doing exercises. It provides a vision measurement method for multimedia data processing that is different from the "E" national standard vision test for people in daily life.

The visual measurement system provided by the invention with the features of digital visual mark and voice recognition includes three functional units: the visual mark display unit, the voice collection unit and the measurement data processing unit.

The characteristic of the optotype display unit is that after receiving the control signal sent by the measurement data processing unit, the liquid crystal display is used to display the digital optotype conforming to the size of the international vision testing standard.

It is used to display the vision detection signal conforming to the international vision detection standard. Each time a randomly transformed digital optotype signal from five numbers of 3, 5, 6, 8, and 9 appears on the detection visual mark display unit, the size of the visual mark It matches the logarithmic system international vision testing standard; the display content and process of the visual mark display unit are under the control of the multimedia data processing unit, and the visual mark recognition received by the voice acquisition unit and the voice signal sent by the sound unit occur sequentially; the visual mark The size of the visual mark displayed by the display unit decreases step by step according to the visual acuity test standard.

The voice acquisition unit is characterized in that it recognizes the Chinese pronunciation of the digital visual mark shouted by the visual inspector; it converts the voice signal into a digital signal and transmits it to the measurement data processing unit.

The tester keeps a specified distance of 5m from the visual target display unit (liquid crystal display), and reads out the digital visual target by sending a letter in Chinese. Chinese "love" (eye) is used as the trigger signal to start the system, and the system automatically enters the vision test processing state; the visual mark signal appears on the visual mark display unit; during the visual test process, the visual tester reads in the form of voice pronunciation according to his own vision ability. Give the Chinese pronunciation of the visual objects you see. The voice signal can connect the microphone with the system through the audio cable, or connect with the system through the bluetooth wireless communication device.

The measurement data processing unit is a visual measurement system with digital visual mark and voice recognition features, and it is characterized in that the content and steps processed by the measurement data processing unit include:

1. After receiving the voice recognition "eye" data signal from the voice acquisition unit, the system enters the measurement working state;

The 2nd, from 3, 5, 6, 8, 9 digital optotype collections that five digits form, randomly extract one as the visual target display signal content, after the display size control signal is processed, send to the visual target display unit;

The 3rd, after receiving the voice recognition data signal of voice acquisition unit, discriminate with the display signal sent to visual mark display unit, if the result is true, then modify the display size control signal and process it to turn the second; if the result is false, Then the calculation and test results are sent to the visual mark display unit;

Step 4. Notify the tester of the vision test result, enter the waiting state, and turn to the second step after receiving the "eye" data signal from the next tester.

Advantages and beneficial effects of the present invention

The visual measurement system and method with the characteristics of digital visual mark and voice recognition disclosed by the present invention can realize visual acuity inspection through the conversion between three multimedia signals, namely visual signal, voice signal and data signal describing the tester's visual acuity. measurement process.

1. Make people's vision testing process simple, convenient and easy to use.

2. The processing of multimedia signals increases the interest of the measurement process, promotes the intelligent interaction between people and the system, and virtually provides an operation method for people's eye hygiene and vision exercise.

3. The processing process of multimedia signals can provide an interactive and relaxing optional treatment method for the treatment of children with autism.

4. It solves the waste of human resources caused by the service mode in which a doctor is required to point out the visual mark on the eye chart in the traditional vision detection method, and people can carry out vision measurement and exercise at any time.

5. Applying this visual inspection method facilitates the automatic collection, storage, processing and transmission of data in the information system.

Description of drawings

Fig. 1 is the man-machine interface of the visual measurement system with digital visual mark and speech recognition features of the present invention.

Fig. 2 is a schematic diagram of a visual measurement system and method for digital visual marks and speech recognition features.

In the figure, 1. Visual mark display unit, 2. Tester, 3. Voice collection unit, 4. Measurement data processing unit.

Detailed ways

The visual measurement system and method with the characteristics of digital visual mark and voice recognition, its hardware platform is composed of visual mark display unit, audio frequency collection unit, detection data processing unit. The detection data processing unit is connected with the visual mark display unit through a video port and a video cable. The visual mark display unit can be replaced by a LCD TV used to display digital visual mark signals. The audio collection unit is connected to the detection data processing unit through the audio line and the audio collection port of the computer. Keep a specified distance of 5m between the subject and the visual target display unit (LCD TV), and read out the digital visual target by sending a letter in Chinese. The interface of the visual measurement system disclosed by the present invention with the features of digital visual mark and voice recognition is shown in FIG. 1 .

The visual mark display unit, the detected person, the voice acquisition unit and the measurement data processing unit constitute a closed-loop data circulation processing system (see Figure 2); a set of visual mark data processing methods realizes the discrimination of the visual mark data value and the visual mark size signal Control, random draw in dataset (3, 5, 6, 8, 9), and system wait, run, and output processing. Its logic algorithm is described as follows:

The measurement data processing unit discriminates and compares the visual mark display signal and the collected visual mark voice signal, and automatically obtains and outputs the vision test result of the vision tester after circular processing. The system automatically jumps back to the initial state and waits until the system startup trigger tone "eye" is obtained, and then detects again.

The loop processing logic of vision detection data is that when the logic value of the screening result is correct for three consecutive times, the current optotype size level control signal is increased by 1 (that is, the optotype decreases), and the detection continues. When the logical value of the screening result is incorrect three times in a row, the visual acuity test ends, and the true value of the visual acuity after subtracting 1 from the current serial number is output. If the current sequence number is already the minimum sequence number, output the true value of the minimum vision. If the current value is already the maximum number, the visual acuity detection ends, and the maximum visual acuity true value is output.

Claims (4)

1. vision measurement system with digital sighting target and speech recognition features is characterized in that this method comprises three functional units: i.e. sighting target display unit, voice collecting unit and Measurement and Data Processing unit.

2. the vision measurement system with digital sighting target and speech recognition features according to claim 1; It is characterized in that described sighting target display unit is after receiving the control signal of sending the Measurement and Data Processing unit, the performance of application liquid crystal display meets the digital sighting target of international vision examination criteria size.

3. the vision measurement system with digital sighting target and speech recognition features according to claim 1; It is characterized in that described voice collecting unit is the digital sighting target Chinese pronunciation that the recognition visible sensation tester barks out, and will convert digital signal transfers into by voice signal and give the Measurement and Data Processing unit.

4. the vision measurement system with digital sighting target and speech recognition features according to claim 1 is characterized in that the content of described Measurement and Data Processing cell processing and step comprise:

1st, receive the unitary speech recognition of voice collecting " love " data signal (eye) after, system gets into the surveying work state;

2nd, from the digital sighting target set that 3,5,6,8,9 five number sign indicating numbers are formed, randomly draw one, after showing that big or small control signal is handled, send to the sighting target display unit as sighting target shows signal content;

3rd, receive behind the unitary voice recognition data signal of voice collecting and screen,, then revise and show that big or small control signal diminishes and handle commentaries on classics the 2nd if the result be true with the shows signal that is dealt into the sighting target display unit; If the result is false, then calculates test result and pass to the sighting target display unit;

4th, notify tester's vision testing result, get into waiting state, receive after next tester sends " love " data signal (eye) and change the 2nd.

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