CN111685635A

CN111685635A - Human body sitting posture correction method

Info

Publication number: CN111685635A
Application number: CN202010713417.8A
Authority: CN
Inventors: 胡波清
Original assignee: Guangdong Lanshuihua Intelligent Electronic Co ltd
Current assignee: Guangdong Lanshuihua Intelligent Electronic Co ltd
Priority date: 2020-03-19
Filing date: 2020-07-22
Publication date: 2020-09-22
Also published as: CN111759212A; CN111671352B; CN111685636A; CN111685631A; CN111685632A; CN111759212B; CN111671352A; CN111759214A; CN111759216A; CN111759215A; CN111759213A; CN111265139A; CN111685634A; CN111685633A

Abstract

The invention relates to a human body sitting posture correcting method which comprises the following steps of detecting an actual distance matrix between a human body and a preset position on a writing plane in real time; step two, converting the actual distance matrix into a horizontal distance matrix; extracting actual human body curve characteristic data in the horizontal distance matrix, and comparing and analyzing the actual human body curve characteristic data with standard human body curve characteristic data; fourthly, executing corresponding control operation based on the comparison analysis result; step five, obtaining an actual vertical distance between the head of the human body and the preset position by simultaneously obtaining an actual distance between the head of the human body and the preset position and an actual horizontal distance; step six, comparing and analyzing the actual vertical distance with the minimum safe distance; and seventhly, executing corresponding control operation according to the comparison analysis result. According to the invention, through multi-level data conversion and judgment, the accuracy of sitting posture correction reminding is greatly improved, and the human body sitting posture is further corrected better.

Description

Human body sitting posture correction method

Technical Field

The invention belongs to the technical field of ToF sensor control, and particularly relates to a human body sitting posture correction method.

Background

Improper sitting posture can easily cause important influences on the health of the spine and eyes of a human body, even various diseases and influences on the health of the human body. Especially for students, when sitting on a desk for writing or reading, if the sitting posture is incorrect, the spine is easy to bend, so that the intervertebral disc is loosened, then the nerve root or the vertebral artery is pressed, the fatigue of the cervical muscle is easy to cause after the sitting posture is poor for a long time, and various cervical spondylosis are caused. Meanwhile, poor sitting posture is easy to damage eyesight, and causes the problems of myopia and the like.

At present, although there are many methods for correcting sitting posture, for example, the invention patent with application number of cn201711012960.x discloses a method for reminding sitting posture correction, which includes the following steps: acquiring user sitting posture information detected by the sitting posture measurer; judging whether the sitting posture of the user is an abnormal sitting posture or not according to the sitting posture information; and when the sitting posture of the user is judged to be the abnormal sitting posture according to the sitting posture information, controlling the sitting posture reminding device to output according to the brightness value corresponding to the sitting posture information so as to remind the user of the abnormal sitting posture. Although the patent of the invention can make a corresponding prompt for the abnormal sitting posture, the judgment of the abnormal sitting posture is wide and not accurate enough, so that the problem that the judgment is inaccurate and the judgment is incorrect is easily caused, and the user cannot be accurately reminded to correct the sitting posture is easily caused.

Also, for example, patent application No. CN201710451455.9 discloses a device for correcting sitting posture and preventing myopia of children and a working method thereof, the device comprising: the device comprises a processor module, a first ultrasonic sensor and a second ultrasonic sensor, wherein the first ultrasonic sensor is arranged in an upward inclined manner so as to detect the distance between the head of a user and a sitting posture correcting and myopia preventing device; the second ultrasonic sensor is horizontally arranged to detect the distance between the body of the user and the sitting posture correcting and myopia preventing device; if the distance between the head of the user and the sitting posture correcting and myopia preventing device and/or the distance between the chest of the user and the sitting posture correcting and myopia preventing device are lower than or higher than the corresponding preset range, the processor module triggers the alarm circuit to give an alarm. Although the method disclosed by the invention can automatically detect the distance between the head and the body of the current user, and send out an alarm signal when the distance is smaller than or larger than the preset range to prompt the child to keep the correct sitting posture, the problem that the reminding is not accurate due to inaccurate measurement still exists, and the sitting posture correction effect is further influenced.

Therefore, although the sitting posture correcting and correcting methods have the function of correcting the sitting posture, the correcting effect is not ideal, and the problem that the sitting posture of a human body cannot be accurately corrected is easily caused. Therefore, it is necessary to design a method for correcting the sitting posture of the human body.

Disclosure of Invention

The invention aims to provide a human body sitting posture correction method, and aims to solve the technical problem that the human body sitting posture cannot be accurately corrected when the sitting posture correction is carried out on the human body in the writing process in the prior art.

In order to achieve the above object, an embodiment of the present invention provides a method for correcting a human body sitting posture, including the following steps:

step one, detecting an actual distance matrix between a human body and a preset position on a writing plane in real time;

step two, converting the actual distance matrix obtained in the step one into a horizontal distance matrix of the human body relative to a preset reference surface;

step three, extracting actual human body curve characteristic data corresponding to the surface of a human body in the horizontal distance matrix obtained in the step two, and comparing and analyzing the actual human body curve characteristic data with standard human body curve characteristic data calibrated in advance relative to the preset reference surface, wherein the standard human body curve characteristic data comprises human body curve characteristic data when the human body is written on the writing plane;

step four, based on the comparison analysis result, executing the following control operation:

(1) if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is smaller than a preset similarity threshold, turning to the first step;

(2) if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is larger than or equal to a preset similarity threshold value, turning to the fifth step;

step five, simultaneously extracting an actual linear distance between the human body surface corresponding to the human head and a preset position in the actual distance matrix and an actual horizontal distance between the human body surface corresponding to the human head and the preset position in the horizontal distance matrix, and obtaining an actual vertical distance between the human head and the preset position by utilizing the pythagorean theorem;

comparing and analyzing the actual vertical distance between the head of the human body and the preset position obtained in the step five with a preset minimum safe distance, wherein the minimum safe distance is the vertical distance between the head of the human body and the writing plane when the human body writes on the writing plane and the posture of the human body does not damage the human body;

seventhly, according to the comparison analysis result, executing the following control operation:

(1) if the actual vertical distance between the human head and the preset position obtained in the step five is larger than or equal to the minimum safety distance, turning to the step one;

(2) and if the actual vertical distance between the head of the human body and the preset position obtained in the step five is smaller than the minimum safety distance, carrying out sitting posture correction reminding on the human body.

In order to achieve the above object, an embodiment of the present invention further provides a human body sitting posture correction method, where the human body sitting posture correction method is performed based on a human body sitting posture correction system, the human body sitting posture correction system includes a distance detection and calculation unit, a feature recognition and processing unit, and a sitting posture correction control unit, the feature recognition and processing unit is connected to the distance detection and calculation unit, and the sitting posture correction control unit is connected to the feature recognition and processing unit; the human body sitting posture correcting method specifically comprises the following steps:

step one, detecting an actual distance matrix between a human body and a preset position on a writing plane in real time through the distance detection and calculation unit;

secondly, converting the actual distance matrix obtained in the first step into a horizontal distance matrix of the human body relative to a preset reference surface through the characteristic identification processing unit;

extracting actual human body curve characteristic data corresponding to the surface of the human body in the horizontal distance matrix obtained in the second step through the characteristic recognition processing unit, and comparing and analyzing the actual human body curve characteristic data with standard human body curve characteristic data calibrated in advance relative to the preset reference surface through the characteristic recognition processing unit, wherein the standard human body curve characteristic data comprises human body curve characteristic data when the human body is written on the writing plane;

(1) if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is judged to be smaller than a preset similarity threshold value through the characteristic identification processing unit, turning to the first step;

(2) if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is judged to be more than or equal to a preset similarity threshold value through the characteristic identification processing unit, turning to the fifth step;

step five, simultaneously extracting an actual straight-line distance between the human body surface corresponding to the human head and a preset position in the actual distance matrix and an actual horizontal distance between the human body surface corresponding to the human head and the preset position in the horizontal distance matrix through the characteristic recognition processing unit, and obtaining an actual vertical distance between the human head and the preset position through the characteristic recognition processing unit by utilizing the pythagorean theorem;

comparing and analyzing the actual vertical distance between the head of the human body and the preset position obtained in the step five with a preset minimum safe distance through the feature recognition processing unit, wherein the minimum safe distance is the vertical distance between the head of the human body and the writing plane when the human body is written on the writing plane and the posture of the human body does not damage the human body;

(1) if the characteristic identification processing unit judges that the actual vertical distance between the human head obtained in the step five and the preset position is larger than or equal to the minimum safe distance, turning to the step one;

(2) and if the characteristic identification processing unit judges that the actual vertical distance between the head of the human body and the preset position obtained in the step five is smaller than the minimum safety distance, performing sitting posture correction reminding on the human body.

In order to achieve the above object, an embodiment of the present invention further provides a human body sitting posture correction method based on the human body sitting posture correction system, including the following steps:

firstly, mounting a light emitter and an optical imaging lens of the human body sitting posture correcting system at a preset position, and enabling the light emitter and the optical imaging lens to be over against a writing plane;

secondly, a modulator of the distance detection and calculation unit generates a modulation signal, and after the generated modulation signal is transmitted to the light emitter, the light emitter emits corresponding modulation light outwards;

step three, the modulated light emitted by the light emitter is reflected to an optical imaging lens after encountering a human body serving as a measured object;

fourthly, receiving reflected modulated light reflected back by a photosensitive detector lattice positioned at the rear side of the optical imaging lens in the distance detection and calculation unit through the lens, and enabling a distance calculator of the distance detection and calculation unit to reflect the phase difference and the period of the modulated light through the reflected modulated light and the emitted modulated light, wherein the formula is based on:

calculating to obtain an actual distance matrix from the measured object to the photosensitive detector dot matrix;

fifthly, the distance converter of the characteristic identification processing unit bases the received actual distance matrix of the human body and the photosensitive detector dot matrix on a formula

Converted into a lattice plane of the human body relative to the photosensitive detectorThe horizontal distance matrix is transmitted to a characteristic comparison processor of a characteristic identification processing unit, wherein QQ 'is actual distance data between a human body and a photosensitive detector lattice, and (x', y ') and O' F are known parameters in the photosensitive detector lattice;

step six, extracting actual human body curve characteristic data corresponding to the human body surface in the horizontal distance matrix obtained in the step five by a characteristic comparison processor of the characteristic identification processing unit, and then comparing and analyzing the actual human body curve characteristic data with standard human body curve characteristic data calibrated in advance relative to the preset reference surface by the characteristic comparison processor, wherein the standard human body curve characteristic data comprises human body curve characteristic data when a human body writes on the writing plane;

and step seven, based on the comparative analysis result in the step six, executing the following control operation:

(1) if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is judged to be smaller than a preset similarity threshold value through the characteristic identification processing unit, turning to a second step;

(2) if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is judged to be more than or equal to a preset similarity threshold value through the characteristic identification processing unit, turning to the step eight;

step eight, simultaneously extracting an actual linear distance between the human body surface corresponding to the human head and a preset position in the actual distance matrix and an actual horizontal distance between the human body surface corresponding to the human head and the preset position in the horizontal distance matrix through the characteristic recognition processing unit, and obtaining an actual vertical distance between the human head and the preset position through the characteristic recognition processing unit by utilizing the pythagorean theorem;

step ten, according to the comparison analysis result, executing the following control operation:

(1) if the characteristic identification processing unit judges that the actual vertical distance between the human head obtained in the step five and the preset position is larger than or equal to the minimum safe distance, turning to a step two;

(2) if the characteristic recognition processing unit judges that the actual vertical distance between the head of the human body and the preset position obtained in the step five is smaller than the minimum safety distance, carrying out sitting posture correction reminding on the human body; wherein, the sitting posture correction reminding at least comprises extinguishing a sitting posture correction reminding indicator lamp or an illuminating lamp preset on the writing plane and opening a sitting posture correction reminding buzzer preset on the writing plane.

One or more technical schemes in the human body sitting posture correction method provided by the embodiment of the invention have at least one of the following technical effects:

(1) the method comprises the steps of converting an actual distance matrix between a human body and a preset position on a writing plane into a horizontal distance matrix, extracting actual human body curve characteristic data corresponding to the surface of the human body from the horizontal distance matrix, comparing and analyzing the actual human body curve characteristic data with standard human body curve characteristic data, extracting an actual straight line distance and an actual horizontal distance when the actual straight line distance and the actual horizontal distance are larger than a similarity threshold value, obtaining an actual vertical distance by using a pythagorean theorem, comparing the actual vertical distance with a minimum safe distance, and executing sitting posture correction reminding on the human body when the actual vertical distance is smaller than the minimum safe distance, so that the accuracy of the sitting posture correction reminding is greatly improved through multi-level data conversion and judgment, and the human body is further corrected better;

(2) the invention realizes the accuracy of sitting posture correction reminding based on the ToF sensor, can be used for reminding the sitting posture of a human body, can also be applied to other reminding, and has wide popularization and application prospects.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a block diagram of a human sitting posture correction system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the optical path structure of the light beam emission and reflection detection of the distance detection and calculation unit in the human body sitting posture correction system of the present invention;

FIG. 3 is a schematic diagram of the actually measured distance between the measured point of the measured human body and the photosensitive detector dot matrix;

FIG. 4 is a schematic illustration of the conversion of the measured distance of FIG. 3 to a horizontal distance;

FIG. 5 is a schematic diagram of a corresponding structure of light paths between a measured point in a measured space and a photosensitive detection pixel point in a photosensitive detector dot matrix;

FIG. 6 is a schematic diagram of a distance conversion structure for converting the actual measurement distance between the measured point in the measured space and the photosensitive detection pixel point into the horizontal distance between the measured point in the measured space and the lattice plane of the photosensitive detector;

fig. 7 is a schematic diagram of the installation position of the human body sitting posture correction system and the simulation of the human body when writing on a writing plane.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In one embodiment of the present invention, as shown in fig. 1-2, an human sitting posture correction system is provided, which includes a distance detection calculation unit, a feature recognition processing unit and a sitting posture correction control unit.

As shown in fig. 7, the distance detecting and calculating unit is installed at a predetermined position, in this embodiment, the distance detecting and calculating unit is installed on a desk, a plane where the desk is located is a horizontal plane, and the distance detecting and calculating unit is arranged over the desk, so that the distance detecting and calculating unit can detect a user located on the desk. Specifically, when a user reads or writes on a desk, the desktop is a writing plane, and of course, in other application scenarios, for example, when the distance detection and calculation unit is installed on an office desk or other table top, the office desk and other table top are the writing plane.

Further, the distance detection and calculation unit is configured to detect an actual distance between the human body and a predetermined position on the writing plane in real time based on a time-of-flight principle, where the actual distance is a multi-point distance corresponding to a plurality of position points, i.e., a distance matrix, and the distance detection and calculation unit monitors the actual distance matrix between the human body and the predetermined position on the writing plane in real time.

Referring to fig. 1, the distance detection and calculation unit includes a light emitter, a modulator, an optical imaging lens, a photosensitive detector dot matrix, a controller and a distance calculator, the controller is connected to the modulator and the photosensitive detector dot matrix and is used for providing modulation control signals to the modulator, the modulator is connected to the light emitter and is used for providing modulation signals to light beams emitted by the light emitter, and the modulator is further connected to the photosensitive detector dot matrix and is used for providing basic modulation information. The light emitter is preferably an infrared light emitter and is used for emitting modulated light beams to a measured object, the modulated light beams reach the surface of the measured object, are reflected by the surface of the measured object and then enter the optical imaging lens, are input to the photosensitive detector dot matrix after being shaped by the optical imaging lens, the photosensitive detector dot matrix is connected with the distance calculator, and outputs the reflected beam signal to a distance calculator, which performs necessary processing such as noise removal filtering and A/D conversion on the reflected beam, calculating to obtain the distance information between the position point of the measured object reflecting the reflected light beam and the photosensitive detection pixel point in the photosensitive detector lattice receiving the reflected light beam, and the distance information and the relevant position information of the photosensitive detection pixel point are transmitted to a controller, and the controller further transmits the relevant information to a feature identification processing unit.

Preferably, the distance detection calculation unit may be implemented using any one of a 3D sensor, a ToF time-of-flight sensor, a DVS, a structured light sensor, and the like. The following specifically describes the process of calculating the actual distance matrix between the human body and the predetermined position by the distance detection calculation unit based on the ToF time-of-flight principle:

the distance detection calculation unit generates modulated infrared light through a light emitter of the distance detection calculation unit and emits the modulated infrared light outwards, the modulated infrared light is reflected to form reflected infrared light after meeting a measured object, and the reflected infrared light is received by a photosensitive detector dot matrix behind the reflected infrared light after passing through an optical imaging lens of the distance detection calculation unit. The emission modulated infrared light and the reflected infrared light of the distance detection calculation unit are both in sine wave form, and can be expressed in a functional form as follows: the function expression for emitting modulated infrared light is:

the functional expression for reflected infrared light is:

wherein:

t is a time parameter;

a is the amplitude of the modulated infrared light;

t is the sine wave period;

kA is the amplitude of the reflected infrared light;

k is an attenuation coefficient;

the signal phase difference of the currently transmitted modulated infrared light and the received reflected infrared light;

and n is noise wave received and not reflected by the light source of the light emitter of the distance detection calculation unit.

Therefore, the delay time from the emission of the modulated infrared light to the reception of the reflected infrared light formed by the modulated infrared light, i.e., the elapsed flight time of the infrared light:

wherein T is the modulation wave period.

In the time period from the time when the light emitter emits the modulated infrared light to the time when the photosensitive detector receives the reflected infrared light reflected by the measured object, the flying distance of the infrared light is as follows:

where c is the speed of light, i.e. about 3 × 10⁸m/s。

Therefore, the distance between the measured object reflecting the infrared light and the photosensitive detector dot matrix of the distance detection and calculation unit is as follows:

thus, the distance between the measured object and the photosensitive detector dot matrix can be calculated based on the sine wave period of the modulated infrared light and the signal phase difference of the reflected infrared light received by the photosensitive detection pixel point and the modulated infrared light emitted by the light emitter, the distance calculator transmits the sine wave period and the signal phase difference to the distance calculator, and the distance calculator calculates the actual measurement distance between the measured object and the photosensitive detector dot matrix based on the formula, namely the actual distance matrix.

The photosensitive detector lattice in the distance detection and calculation unit of the invention is provided with a plurality of photosensitive detection pixel points which are arranged in a matrix array form, each photosensitive detection pixel point can be used as an independent photosensitive detector element, thus, the light emitter emits modulated infrared light once outwards, the modulated infrared light is reflected by a plurality of points on the surface of a measured object and then is respectively incident on the corresponding photosensitive detection pixel points in the photosensitive detector lattice, namely, each photosensitive detection pixel point in the photosensitive detector lattice can collect the reflected infrared light and obtain a sensing distance, finally, the actual measurement distance of each frame detected by the photosensitive detector lattice corresponds to an actual distance matrix, the actual measurement distance between each reflection point on the surface of the measured object and the corresponding photosensitive detection pixel point which receives the reflected light of the point is combined with the reflection point to form two-dimensional distance distribution, as shown in fig. 2.

Thus, the distance detection and calculation unit can calculate and obtain an actual distance matrix between the human body and the preset position. Then, the distance detection calculation unit sends an actual distance matrix between the human body and the preset position to the feature recognition processing unit, and the feature recognition processing unit further processes the actual distance matrix.

Further, referring to fig. 1, the feature recognition processing unit includes a communication interface module, a distance converter, a feature comparison processor, a standard feature storage and an output module, the communication interface module is connected to the controller of the distance detection computing unit, the distance converter is connected to the communication interface module, the feature comparison processor is connected to the distance converter, the standard feature storage is connected to the feature comparison processor, and the output module is connected to the feature comparison processor.

The feature recognition processing unit is configured to convert the actual distance matrix calculated by the distance detection calculating unit into a horizontal distance matrix of the human body relative to a predetermined reference surface, and the working process of the feature recognition processing unit is specifically described as follows:

firstly, the actual distance acquired by the distance detection and calculation unit is the linear distance between each measured point and the corresponding photosensitive detection pixel point in the distance detection and calculation unit, and the whole distance detection and calculation unit can be regarded as a circle center particle for easy understanding.

Next, taking the process of detecting the whole human body by the distance detection and calculation unit as an example, referring to fig. 3 to 4, in this embodiment, the distance detection and calculation unit uses the ToF sensor, and the whole ToF sensor can be used as a mass point, and it can be seen from the figure that when the included angle between the ToF sensor and the detected region of the human body is too large, both the measured distances d1 and d5 are far greater than d 3. If the actual measurement distances d1 and d5 are directly adopted for human body identification, the difference between the characteristics reflected by the distances and the characteristics of the human body is large, and the human body identification precision is greatly reduced.

Firstly, as shown in fig. 5-6, a light beam reflected by each measured point Qn in the measured area a of the human body is focused by an optical imaging lens and then enters a corresponding photosensitive detection pixel point in a photosensitive detector lattice, and the distance between the measured point Qn of each human body and the corresponding photosensitive detection pixel point can be directly calculated after the photosensitive detection pixel point transmits related phase and frequency information to a distance calculator, and further, if the distance between the measured point Qn of the human body and the corresponding photosensitive detection pixel point is to be converted into a horizontal distance between the measured point Qn of the human body and a lattice plane of the photosensitive detector, an inclination angle of a straight line connecting the measured point Qn of the human body and the corresponding photosensitive detection pixel point with respect to the lattice plane of the photosensitive detector needs to be known, as shown in an enlarged light path structure diagram shown in fig. 6, after being reflected by a certain human body measuring point Q in a human body measured area A, a modulated light beam generated by the light reflector passes through an optical imaging lens in the distance detection calculation unit and is focused on a corresponding photosensitive detection pixel point Q 'in a photosensitive detector dot matrix behind the modulated light beam, and a plane B where the photosensitive detector dot matrix is located serves as a horizontal distance reference plane and extends to the plane B'. Taking an orthographic projection central point O 'of an optical center F of the optical imaging lens in a photosensitive detector lattice plane B (namely the intersection point of a central normal of the optical imaging lens and the photosensitive detector lattice plane B) as a coordinate origin, establishing a coordinate system X' O 'Y' in the photosensitive detector lattice plane B, wherein FO 'is vertical to the plane B, wherein the distance between the position Q' (X ', Y') of each photosensitive detection pixel point in the photosensitive detector lattice plane B in the X 'O' Y 'plane coordinate and FO' belongs to the known quantity in each distance detection calculation unit, because the position of each photosensitive detection pixel point in the photosensitive detector lattice of each distance detection unit and the distance between the optical imaging lens and the photosensitive detector lattice plane are fixed and initially calibrated, specific position coordinate information and distance information are written in the initialization process. And each distance detection calculation unit transmits the position coordinate information of each photosensitive detection pixel point in the photosensitive detector dot matrix and the distance information between the optical imaging lens and the photosensitive detector dot matrix plane to a distance converter of the characteristic identification processing unit together with the measured actual distance between the measured point and the corresponding photosensitive detection pixel point.

Thus, the distance between a certain human body measured point Q and the corresponding photosensitive detection pixel point Q' in the measured area A can be converted into the horizontal distance d between the human body measured point Q and the lattice plane of the photosensitive detector according to the following formula:

horizontal distance d ═ QC ═ QQ · cos (a)

Wherein

As mentioned above, for each distance detection calculating unit, the position coordinate information (x ', y') of each photosensitive detection pixel point and the distance information O 'F between the optical imaging lens and the photosensitive detector lattice plane are both inherent information of the distance detection calculating unit, and belong to known information parameters, and the distance QQ' between each measured body point and the corresponding photosensitive detection pixel point can be calculated by formula

Calculated by a distance calculator of a distance detection calculation unit. The distance detection calculation unit calculatesAfter the distance QQ 'and the position coordinate information (x', y ') of the corresponding photosensitive detection pixel point and the distance information O' F between the optical imaging lens and the photosensitive detector lattice plane are transmitted to the feature identification processing unit, the horizontal distance from the measured point of the human body to the photosensitive detector lattice plane is calculated by the distance converter based on the following formula:

the horizontal distance d is associated with the position coordinate information (x ', y') of the photosensitive detection pixel point, so that each photosensitive detection pixel point corresponds to a horizontal distance, and finally a horizontal distance distribution matrix is formed corresponding to the position information of all photosensitive detection pixel points on the photosensitive detector dot matrix, so that after a frame distance matrix detected by the distance detection calculation unit is obtained, the horizontal distance matrix from each measured point to the plane where the photosensitive detector dot matrix is located can be obtained through a distance converter, that is, the distances d1, d2, d3 and d4 … … in fig. 3 are converted into the corresponding distances d1 ', d 2', d3 'and d 4' … … in fig. 4, and the horizontal distance matrix distribution is formed by combining the position information of the corresponding photosensitive pixel points associated with the distances.

After the distance converter in the feature identification processing unit performs the distance conversion operation, the actual distance matrix between the human body and the distance detection calculating unit can be converted into a horizontal distance matrix of the human body corresponding to the actual distance matrix relative to a preset reference surface.

Then, the distance converter sends the horizontal distance matrix to the feature comparison processor of the feature recognition processing unit, the feature recognition processing unit extracts actual human body curve feature data corresponding to the human body surface in the horizontal distance matrix, and the actual human body curve feature data is compared and analyzed with standard human body curve feature data calibrated in advance relative to the preset reference surface through the feature comparison processor, and the following two results are obtained after comparison and analysis, specifically as follows:

(1) when the characteristic comparison processor judges that the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is smaller than a preset similarity threshold value, the fact that a human body does not read or write on the writing plane means that the actual distance matrix between the user and the distance detection calculation unit at the preset position needs to be detected again.

(2) When the characteristic comparison processor judges that the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is greater than or equal to a preset similarity threshold value, the fact that a human body starts to read or write on the writing plane means that the next judgment can be carried out.

The actual human body curve characteristic data at least comprises human body head characteristic data and human body neck characteristic data; further, the human head feature data comprises feature data of human face, nose, mouth and chin contour curves.

The standard human body curve characteristic data comprise human body curve characteristic data when a human body is written on the writing plane. Specifically, when the human body writes on the writing plane, a horizontal mapping contour formed by horizontal distances of all feature points of the surface of the human body relative to the preset reference plane is calibrated in advance to serve as the standard human body curve feature data.

In addition, be provided with intelligent control trigger area in the characteristic comparison treater, intelligent control trigger area is used for judging whether there is the user to be in write the plane and write or read. When the feature comparison processor judges that the human body is located in an intelligent control triggering area of the human body sitting posture correction system according to the horizontal distance matrix, namely when the horizontal distance matrix is smaller than the radius of the intelligent control starting area, the fact that a person possibly needs to write or read at the moment is meant, and at the moment, the feature comparison processor extracts actual human body curve feature data corresponding to the surface of the human body in the horizontal distance matrix.

Therefore, whether a user is likely to write on the writing plane is judged by setting the intelligent control trigger area, and then whether the user writes or reads is judged by comparing and analyzing the actual human body curve characteristic data with the standard human body curve characteristic data calibrated in advance relative to the preset reference surface, so that the detection accuracy is improved through double judgment, a foundation is laid for the subsequent sitting posture correction reminding, the accuracy of sitting posture correction reminding is ensured, and the occurrence of misjudgment is avoided.

After the characteristic comparison processor judges that the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is greater than or equal to a preset similarity threshold value, the characteristic comparison processor simultaneously extracts the actual linear distance between the human body surface corresponding to the human head and the preset position in the actual distance matrix and the actual horizontal distance between the human body surface corresponding to the human head and the preset position in the horizontal distance matrix through the characteristic identification processing unit, and the actual vertical distance between the human head and the preset position is obtained through the characteristic identification processing unit by utilizing the pythagorean theorem. Here, it can also be understood that the actual implementation distance is a hypotenuse of a right triangle, the actual horizontal distance is a base of the right triangle, and when the actual linear distance between the human body surface in the actual distance matrix corresponding to the head of the human body and the predetermined position and the actual horizontal distance between the human body surface in the horizontal distance matrix corresponding to the head of the human body and the predetermined position are extracted at the same time, the hypotenuse and the base of the right triangle are known, so that a vertical side of the right triangle can be calculated by using the pythagorean theorem, and the vertical side is the actual vertical distance between the head of the human body and the predetermined position.

And then, the characteristic comparison processor compares and analyzes the actual vertical distance between the head of the human body and the preset position with a preset minimum safe distance, wherein the minimum safe distance is the vertical distance between the head of the human body and the writing plane when the human body writes on the writing plane and the posture of the human body does not damage the human body. The following results were obtained after alignment analysis:

(1) if the characteristic comparison processor judges that the actual vertical distance between the head of the human body and the preset position is greater than or equal to the minimum safe distance, the sitting posture of the human body is a safe sitting posture at the moment, and the sitting posture is not damaged to the human body, so that the sitting posture correction reminding of the human body is not needed.

(2) If the actual vertical distance between the head of the human body and the preset position is judged to be smaller than the minimum safety distance by the characteristic comparison processor, the fact that the head of the human body is close to the writing plane at the moment is shown, and the spine of the human body is in a bent state at the moment, so that the pressure between the spines is easily too large, the spine is damaged, and meanwhile, the eyesight of a user is greatly damaged. Therefore, the user can perform the sitting posture correction reminding at the moment.

The sitting posture correction reminding at least comprises a sitting posture correction reminding indicator lamp or an illuminating lamp which is arranged on the writing plane in advance in an extinguishing mode and a sitting posture correction reminding buzzer which is arranged on the writing plane in advance in a starting mode. Wherein, the warning is corrected by the position of sitting corrects the control unit and is carried out, the control unit is corrected including the position of sitting specifically corrects and reminds pilot lamp or light and position of sitting and corrects and remind bee calling organ, the position of sitting corrects and reminds pilot lamp or light and the position of sitting corrects and reminds bee calling organ all with output module is connected, and the position of sitting corrects and reminds pilot lamp or light and the position of sitting corrects and remind bee calling organ all preinstall in writing on the plane, also install in this embodiment on the desk, when needs are corrected the warning to the human body execution position of sitting, the control unit is corrected to the position of sitting specifically carry out as follows:

when the characteristic comparison processor judges that the actual vertical distance between the head of the human body and a preset position is smaller than the minimum safety distance, the characteristic comparison processor sends a control signal to the sitting posture correction control unit through the output module, so that the sitting posture correction control unit controls the sitting posture correction reminding indicator lamp or the illuminating lamp to be turned off, a user is reminded that the sitting posture is damaged, the user needs to adjust the sitting posture correction reminding buzzer, and the sitting posture correction reminding buzzer is controlled to be turned on to sound normally, so that the double reminding function is achieved; when the sitting posture is adjusted by a person, and the actual vertical distance is larger than or equal to the minimum safe distance, the sitting posture correction control unit controls the sitting posture correction reminding indicator lamp or the illuminating lamp to be normally on and controls the sitting posture correction reminding buzzer to not sound normally.

When the characteristic comparison processor judges that the actual vertical distance between the head of the human body and the preset position is greater than or equal to the minimum safe distance, the human body sitting posture standard is represented at the moment, the human body is not damaged, therefore, the human body does not need to be reminded, and the sitting posture correction reminding indicator lamp or the illuminating lamp and the sitting posture correction reminding buzzer do not need to be controlled.

In addition, the writing plane is not limited to be parallel to the horizontal plane in the above embodiments, that is, the plane where the desktop is located may also be inclined, specifically, if one end of the desktop on which the distance detection and calculation unit is installed is set to be a higher end, and one end of the desktop close to the human body is set to be a lower end, at this time, one end of the desktop is higher and the other end is lower. When the actual distance matrix between the head of the human body and the predetermined position is obtained, the actual vertical distance between the head of the human body and the predetermined position is obtained, at this time, the distance detection and calculation unit can also obtain the actual distance matrix between the lower end (such as the position of the chest and abdomen) of the human body close to the desktop and the predetermined position, the actual vertical distance between the lower end of the human body close to the desktop and the horizontal plane where the predetermined position is located can also be obtained by using the obtained actual vertical distance between the head of the human body close to the desktop and the horizontal plane where the predetermined position is located, then, the actual vertical distance between the head of the human body close to the lower end of the desktop and the horizontal plane where the predetermined position is located is added to the actual vertical distance between the head of the human body and the predetermined position, the actual distance from the, and executing corresponding operation according to the judgment.

Finally, the method for correcting the human body sitting posture based on the human body sitting posture correction system is briefly described as follows:

Converting the distance matrix into a horizontal distance matrix of the human body relative to the lattice plane of the photosensitive detector, and transmitting the horizontal distance matrix to a characteristic comparison processor of a characteristic identification processing unit, wherein QQ 'is actual distance data of the human body and the lattice of the photosensitive detector, and (x', y ') and O' F are known parameters in the lattice of the photosensitive detector;

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A human body sitting posture correction method is characterized by comprising the following steps:

2. The method for correcting the sitting posture of the human body as claimed in claim 1, wherein the reminding of the sitting posture correction at least comprises turning off a warning light or an illuminating lamp for the sitting posture correction preset on the writing plane and turning on a buzzer for the reminding of the sitting posture correction preset on the writing plane.

3. The method according to claim 1, wherein the actual human body curve feature data at least comprises human body head feature data and human body neck feature data; the human head feature data comprise feature data of human face, nose, mouth and chin contour curves.

4. The method for correcting the sitting posture of the human body as claimed in claim 1, wherein the first step comprises the following steps:

(1) installing the light emitter and the optical imaging lens at the preset position, and enabling the light emitter and the optical imaging lens to be opposite to the upper part of the writing plane;

(2) generating a modulation signal to a light emitter through a modulator, and emitting a modulated detection light beam outwards by the light emitter;

(3) when a detection light beam emitted by the light emitter meets a human body, the detection light beam is reflected to the optical imaging lens after passing through the human body;

(4) the photosensitive detector lattice behind the optical imaging lens receives the reflected light beam via the optical imaging lens and determines the phase difference and period between the reflected light beam and the emitted light beam based on the formula

And calculating to obtain the actual distance between the human body reflection part of the reflected light beam and the corresponding photosensitive detection pixel point in the photosensitive detector lattice receiving the reflected light beam, wherein the distance is used as the actual distance between the human body and the preset position.

5. The method for correcting the sitting posture of the human body as claimed in claim 1, wherein the second step comprises the following steps:

(1) selecting the preset reference surface as a plane where the photosensitive detector lattice is located, and establishing a plane coordinate system on the preset reference surface, wherein the origin of coordinates is an intersection point of a normal line passing through the optical center of the optical imaging lens and the preset reference surface, and the distance between the origin of coordinates and the optical center is marked as O' F;

(2) converting the actual distance between the human body reflecting part of the reflected light beam and the corresponding photosensitive detection pixel point in the photosensitive detector lattice receiving the reflected light beam into the horizontal distance between the human body reflecting part and the preset reference surface by the following formula:

wherein, QQ ' is the actual distance between the human body reflective part of the reflected light beam and the corresponding photosensitive detection pixel in the photosensitive detector lattice receiving the reflected light beam, and (x ', y ') is the position coordinate of the corresponding photosensitive detection pixel in the plane coordinate system of the predetermined reference plane.

6. The method for correcting the sitting posture of the human body as claimed in claim 1, wherein said step three comprises the following steps:

(1) when a human body writes on the writing plane, a horizontal mapping contour formed by horizontal distances of all characteristic points on the surface of the human body relative to the preset reference plane is calibrated in advance to serve as the standard human body curve characteristic data;

(2) extracting actual human body curve characteristic data corresponding to the human body surface in the horizontal distance matrix obtained in the step two;

(3) and comparing and analyzing the actual human body curve characteristic data with the standard human body curve characteristic data.

7. The method for correcting the sitting posture of the human body as claimed in claim 1, wherein the sixth step comprises the following steps:

(1) when a human body writes on the writing plane, setting a vertical distance between the head of the human body and the writing plane as the minimum safe distance in advance;

(2) and comparing and analyzing the actual vertical distance with the minimum safe distance seat.

8. The human body sitting posture correction method is characterized by being carried out based on a human body sitting posture correction system, wherein the human body sitting posture correction system comprises a distance detection calculation unit, a feature recognition processing unit and a sitting posture correction control unit, the feature recognition processing unit is connected to the distance detection calculation unit, and the sitting posture correction control unit is connected to the feature recognition processing unit; the human body sitting posture correcting method specifically comprises the following steps:

9. The human body sitting posture correction method according to claim 8, wherein the distance detection calculation unit comprises a light emitter, a modulator, an optical imaging lens, a photosensitive detector lattice, a controller and a distance calculator; the controller is connected with the modulator and the photosensitive detector dot matrix, the modulator is connected with the light emitter and the photosensitive detector dot matrix, the light emitter is used for emitting modulated detection light beams, the detection light beams are reflected by a human body as a detected object and then are incident to the optical imaging lens, and the detection light beams are input to the photosensitive detector dot matrix after being shaped by the optical imaging lens, the photosensitive detector lattice is arranged right behind the optical imaging lens and connected to the distance calculator, the distance calculator calculates actual distance information between the measured object and the photosensitive detector dot matrix based on the reflected light beam information received by the photosensitive detector dot matrix, and the actual distance information and the inherent information of the photosensitive detector lattice are transmitted to a controller, and then the controller transmits the related information to the characteristic identification processing unit.

10. The method according to claim 9, wherein the photo detector array has a plurality of photo detection pixels arranged in a matrix array, each photo detection pixel being an independent photo detector element, modulated detection beams emitted by the light emitter are reflected by multiple points on the surface of a detected object and then are respectively incident on corresponding photosensitive detection pixel points of the photosensitive detector lattice, each photosensitive detection pixel point of the photosensitive detector lattice receives a reflected light beam from a corresponding reflection point on the surface of the measured object, the actual distance information calculated by the distance calculator is an actual distance matrix corresponding to the position of each reflecting point of the measured object, and the horizontal distance information obtained by converting the actual distance information is converted into a horizontal distance matrix corresponding to the position of each photosensitive detection pixel point of the photosensitive detector dot matrix by the characteristic identification processing unit.

11. The method for correcting the sitting posture of the human body as claimed in claim 10, wherein the modulated detection light beam emitted by the light emitter is a sine wave, a pulse wave or other periodic modulation wave; the distance calculator calculates the actual distance between a certain reflection point of the measured object and the photosensitive detection pixel point corresponding to the photosensitive detector lattice based on the following formula:

wherein: c is the speed of light, T is the period of the modulated wave,

the phase difference between the reflected light beam received by the corresponding photosensitive detection pixel point and the corresponding detection light beam emitted by the light emitter is obtained.

12. The method for correcting the sitting posture of the human body as claimed in claim 11, wherein the feature recognition processing unit comprises a communication interface module, a distance converter, a feature comparison processor, a standard feature memory and an output module, the communication interface module is connected to the controller of the distance detection computing unit, the distance converter is connected to the communication interface module, the feature comparison processor is connected to the distance converter, the standard feature memory is connected to the feature comparison processor, and the output module is connected to the feature comparison processor;

the distance converter converts an actual distance matrix between the human body and the distance detection calculation unit into a horizontal distance matrix of the human body relative to a plane where the photosensitive detector lattice is located, and then transmits the horizontal distance matrix to the characteristic comparison processor;

an intelligent control trigger area is arranged in the characteristic comparison processor, the characteristic comparison processor judges whether the human body is positioned in the intelligent control trigger area of the human body sitting posture correction system or not according to the horizontal distance matrix, if the human body is detected to be positioned in the intelligent control trigger area, actual human body curve characteristic data corresponding to the surface of the human body in the horizontal distance matrix are extracted, and the actual human body curve characteristic data are compared and analyzed with standard human body curve characteristic data calibrated in advance relative to the preset reference surface; if the similarity between the actual human body curve characteristic data and the standard human body curve characteristic data is smaller than or equal to a preset similarity threshold value, the characteristic comparison processor simultaneously extracts an actual distance between the human body surface in the actual distance matrix and the preset position corresponding to the head of the human body and an actual horizontal distance between the human body surface in the horizontal distance matrix and the preset position corresponding to the head of the human body, obtains an actual vertical distance between the head of the human body and the preset position by utilizing the pythagorean theorem, compares and analyzes the actual vertical distance between the head of the human body and the preset position and a preset minimum safe distance through the characteristic comparison processor, and if the actual vertical distance is smaller than the minimum safe distance, executes sitting posture correction reminding on the human body through the sitting posture correction control unit.

13. The method of correcting a sitting posture of a human body as claimed in claim 12, wherein said distance converter converts the actual distance matrix into the horizontal distance matrix by:

firstly, the distance converter converts the measured distance between each reflection point on the surface of the measured object and the corresponding photosensitive detection pixel point into the horizontal distance of the reflection point on the surface of the measured object relative to the plane where the photosensitive detector lattice is located according to the following formula:

the QQ' is the measured distance between the surface reflection point of the measured object and the corresponding photosensitive detection pixel point, and is calculated by a distance calculator in the distance detection calculation unit; (x ', y') is the position coordinate of the corresponding photosensitive detection pixel point in the photosensitive detector lattice plane coordinate system; o' F is the distance between the optical center of the optical imaging lens and the origin of coordinates in the lattice plane coordinate system of the photosensitive detector; d is the horizontal distance of the reflection point on the surface of the measured object relative to the plane where the photosensitive detector lattice is located;

the photosensitive detector lattice plane coordinate system refers to: the method comprises the following steps of taking an intersection point of a straight line which passes through the optical center of the optical imaging lens and is perpendicular to the plane where a photosensitive detector dot matrix is located and the plane where the photosensitive detector dot matrix is located as a coordinate origin, and establishing a coordinate system in the plane where the photosensitive detector dot matrix is located, wherein the position coordinate of each photosensitive detection pixel point in the photosensitive detector dot matrix plane coordinate system and the distance between the optical center of the optical imaging lens and the coordinate origin belong to known quantities;

and secondly, the distance converter correlates each horizontal distance obtained by conversion with the position of the corresponding photosensitive detection pixel point to form the horizontal distance matrix.

14. A method for correcting a sitting posture of a human body according to any one of claims 8 to 13, comprising the steps of: