CN117398088B - Height measurement method based on XR - Google Patents

Height measurement method based on XR Download PDF

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CN117398088B
CN117398088B CN202311731499.9A CN202311731499A CN117398088B CN 117398088 B CN117398088 B CN 117398088B CN 202311731499 A CN202311731499 A CN 202311731499A CN 117398088 B CN117398088 B CN 117398088B
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CN117398088A (en
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冯中雪
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West China Hospital of Sichuan University
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Abstract

The invention relates to the technical field of XR, and discloses a height measurement method based on XR.S 1, a helmet is worn by a user, a handle is held by the user, and an upright position is maintained; recording first helmet coordinatesHThe method comprises the steps of carrying out a first treatment on the surface of the S2, standing at a low head of 90 degrees, and recording a second helmet coordinateH'The method comprises the steps of carrying out a first treatment on the surface of the S3, keeping the lower head at 90 degrees, and squatting until the handle touches the ground; recording the coordinates of the first handleCThird helmet coordinatesHeTakes human feet as particlesOToOAs the origin, toOCTaking the radius as a radius, and virtually forming a circle on a camera plane; s4, keeping the head low by 90 degrees, standing, taking a picture by using the helmet, and calculating the radius r of an inscribed circle of the picture and the radius of the imaginary circle in the picturer'The method comprises the steps of carrying out a first treatment on the surface of the S5, using the originOSecond helmet coordinatesH'VR helmet view angle furthest point when taking pictureC'And constructing a three-dimensional space triangle, and calculating the distance h between the helmet and the ground. The invention can accurately measure the height by simple operation based on the XR equipment.

Description

Height measurement method based on XR
Technical Field
The invention relates to the technical field of XR, in particular to a height measurement method based on XR.
Background
XR (augmented reality) is a technology that combines AR and VR technologies, including both Augmented Reality (AR) and Virtual Reality (VR). The XR technology enables a user to interact with the real world in a virtual environment, virtual elements are overlapped in the real environment through the AR technology, and meanwhile a brand new virtual scene is created by using the VR technology. XR combines the advantages of AR and VR technique, is more nimble in interactive mode, can interact through multiple modes such as cell-phone, panel computer, virtual reality helmet, handle.
The invention patent application CN115641408A discloses a method, a system, VR glasses and a storage medium for constructing a VR virtual world based on the real world, and particularly discloses a method, a system, VR glasses and a storage medium, wherein the method is characterized in that a pose recognition system is a gyroscope and/or a height sensor, when a user wears the VR glasses, the gyroscope and/or the height sensor are used for detecting different poses of the user, the height values of the user in the different poses are directly obtained, the height values obtained in the different poses are compared through the VR glasses, and the height values in the different poses are the entity heights of the user when the height values in the different poses are the largest.
There is also chinese patent application CN111298435a disclosing a field of view control method, VR display terminal, device and medium for VR game, and specifically disclosing that the VR display terminal may include a level sensor and a processing unit, where the level sensor may be electrically connected to the processing unit, alternatively, the level sensor may be implemented based on an ultrasonic sensor and an infrared ranging sensor, and the distance between the VR display terminal and the ground may be measured by the level sensor, where the distance may reflect current height data (e.g., height data) of the player, posture of the player, and so on.
In the prior art, the accuracy of measuring the height through VR equipment is not high, the maximum error is up to +/-30 cm, and the wearing comfort of XR equipment is seriously affected.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the height measuring method based on XR, which is simple in measuring method and high in accuracy.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an XR-based height measurement method comprises the following steps:
s1, wearXROf apparatusVRA helmet holding the handle in a standing position; recording the initial position of the helmet as the first helmet coordinateH(h x ,h y ,h z ) ；
S2, standing the low head by 90 degrees, recording the helmet coordinate of the low head as a second helmet coordinateH'(h x ' ,h y ' ,h z ' )；
S3, keeping the lower head at 90 degrees, and squatting until the handle touches the ground; the coordinates of the handle at this time are recorded as the coordinates of the first handleC(c x ,c y ,c z )The helmet coordinate is the third helmet coordinateHe(he x ,he y ,he z )Takes human feet as particlesO(o x ,o y ,o z )ToOAs the origin, toOCTaking the radius as a radius, and virtually forming a circle on a camera plane;
s4, keeping the head low by 90 degrees, standing up, and using the head wearVRThe helmet shoots a picture and calculates the inscribed circle radius of the picturerRadius of the imaginary circle in the picturer'；
S5, using the originO(o x ,o y ,o z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )When taking picturesVRThe furthest point C reached by the helmet visual angle'Constructing a three-dimensional space triangle, solving the line segment ratio in the photographed picture and the constructed right triangle, and calculating the head-wearingVRDistance between helmet and groundh。
Further, in step S5, the following relationship is established by solving the line segment ratio in the photographed image and the constructed right triangle:
wherein alpha isFOV/2，FOVIs thatVRThe field angle of the helmet; wherein the first handle coordinatesC(c x ,c y ,c z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )The record is made by the VR device,the picture shot in the step S4 is directly calculated; according to the above relation, the relation can be listed(o x ,o y ,o z )In equation (1) of (2),
(1)
in the triangle constructed in step S5,OC⊥OHi.e.Can list about(o x ,o y ,o z )Equation (2) of (2):
(2)
in the triangle constructed in step S5，O、H'、HeOn the same straight line, i.eThree concerns can be obtained(o x ,o y ,o z )Is a linear equation of (2):
(3)
solving the above equations (1), (2) and (3) in a combined way to obtain。
Further, the method also comprises the step of correcting the distance h, wherein the correction formula is as follows:
wherein the first helmet coordinatesH(h x ,h y ,h z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )Recorded by the VR device.
Further, calculating the final human height is also included:
wherein,representing the distance between the center position of the pupils of the eyes of the human body and the top position of the head,/for the eyes>Is a statistical value.
Further, the distance between the center position of the pupils of the two eyes of the human body and the top position of the head is calculated as follows:substituting formula (5) can give:
(6)
the invention has the beneficial effects that: the invention can accurately measure the height of the human body by simple operation based on the XR equipment, and has small calculated amount and high calculation speed.
It should be apparent that, in light of the foregoing, various modifications, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
The above-described aspects of the present invention will be described in further detail below with reference to specific embodiments in the form of examples. It should not be understood that the scope of the above subject matter of the present invention is limited to the following examples only. All techniques implemented based on the above description of the invention are within the scope of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a simulation of the distance of a headset XR device from the ground.
Detailed Description
It should be noted that, in the embodiments, algorithms of steps such as data acquisition, transmission, storage, and processing, which are not specifically described, and hardware structures, circuit connections, and the like, which are not specifically described may be implemented through the disclosure of the prior art.
An XR-based height measurement method comprises the following steps:
s1, wearXROf apparatusVRA helmet holding the handle in a standing position; recording the initial position of the helmet as the first helmet coordinateH(h x ,h y ,h z )；
S2, standing the low head by 90 degrees, recording the helmet coordinate of the low head as a second helmet coordinateH'(h x ' ,h y ' ,h z ' )；
S3, keeping the lower head at 90 degrees, and squatting until the handle touches the ground; the coordinates of the handle at this time are recorded as the coordinates of the first handleC(c x ,c y ,c z )The helmet coordinate is the third helmet coordinateHe(he x ,he y ,he z )Takes human feet as particlesO(o x ,o y ,o z )ToOAs the origin, toOCTaking the radius as a radius, forming a circle on a camera pixel plane in an imaginary mode, wherein each coordinate point and the position relation of each coordinate point are shown in fig. 1;
s4, keeping the head low by 90 degrees, standing up, and using the head wearVRThe helmet shoots a picture and calculates the inscribed circle radius of the picturerRadius of the imaginary circle in the picturer'The method comprises the steps of carrying out a first treatment on the surface of the Wherein, when keeping the head low by 90 °, the OC connection line is parallel to the head plane, i.e. the pixel plane of the camera;
s5, using the originO(o x ,o y ,o z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )When taking picturesVRThe furthest point C reached by the helmet visual angle'Constructing a three-dimensional space triangle, solving the line segment ratio in the photographed picture and the constructed right triangle, and calculating the head-wearingVRDistance between helmet and groundh。
In the above steps S2, S3, S4, the lower head 90 ° is kept for the purpose of the photographing plane being parallel to the space plane. In the standing position, the head-to-foot line is perpendicular to the ground in the volume, and the low head 90 ° is for the camera-to-foot line to be perpendicular to the camera plane. If the head (camera) and foot are considered as particles at this time. It can be derived that the camera plane is parallel to the ground.
When the plane of the camera is parallel to the ground, the line segment ratio in the photographed picture has a similar ratio to the constructed three-dimensional space triangle.
Specifically, in step S5, the following relationship is established by solving the line segment ratio in the photographed image and the constructed right triangle:
wherein alpha isFOV/2，FOVIs thatVRThe field angle of the helmet; wherein the first handle coordinatesC(c x ,c y ,c z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )The record is made by the VR device,the picture shot in the step S4 is directly calculated; according to the above relation, the relation can be listed(o x ,o y ,o z )In equation (1) of (2),
(1)
in the triangle constructed in step S5,OC⊥OHi.e.Can list about(o x ,o y ,o z )Equation (2) of (2):
(2)
in the triangle constructed in step S5，O、H'、HeOn the same straight line, i.eThree concerns can be obtained(o x ,o y ,o z )Is a linear equation of (2):
(3)
solving the above equations (1), (2) and (3) in a combined way to obtain。
Head wear calculated as described aboveVRDistance between helmet and groundhThe height is 90 degrees lower than the head, and the head-up height is required to be added; assuming that the low head is 90 degrees accurate and isosceles triangle, according to the first helmet coordinateH(h x ,h y ,h z )Second helmet coordinatesH' (h x ' ,h y ' ,h z ' ) It can be known the hypotenuse length ，The height is +.>Therefore, the distance h is corrected by the following correction formula:
(4)
wherein the first helmet coordinatesH(h x ,h y ,h z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )Recorded by the VR device.
Deriving a headsetVRAfter the distance between the helmet and the ground, the method further comprises the step of calculating the height of the human body:
(5)
wherein,representing the distance between the center position of the pupils of the eyes of the human body and the top position of the head,/for the eyes>The statistical value is determined by hardware design, race and individual difference. Difference between pupil center position of eyes and actual head top of person according to statistical value presumed by Asian person>The method comprises the steps of carrying out a first treatment on the surface of the Here also a function of height H, substituted into equation (5), can be derived:
(6)
of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. An XR-based height measurement method is characterized in that: the method comprises the following steps:
s1, wearXROf apparatusVRA helmet holding the handle in a standing position; recording the initial position of the helmet as the first helmet coordinateH (h x ,h y ,h z )；
S2, standing the low head by 90 degrees, recording the helmet coordinate of the low head as a second helmet coordinateH'(h x ' ,h y ' ,h z ' )；
S3, keeping the lower head at 90 degrees, and squatting until the handle touches the ground; the coordinates of the handle at this time are recorded as the coordinates of the first handleC(c x , c y ,c z )The helmet coordinate is the third helmet coordinateHe(he x ,he y ,he z )Takes human feet as particlesO(o x ,o y ,o z )ToOAs the origin, toOCTaking the radius as a radius, and virtually forming a circle on a camera plane;
s4, keeping the head low by 90 degrees, standing up, and using the head wearVRHelmet shooting a pictureSlice, calculate the inscribed circle radius of the picturerRadius of the imaginary circle in the picturer'；
S5, using the originO(o x ,o y ,o z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )When taking picturesVRThe furthest point C reached by the helmet visual angle'Constructing a three-dimensional space triangle, solving the line segment ratio in the photographed picture and the constructed right triangle, and calculating the head-wearingVRDistance between helmet and groundhThe method comprises the steps of carrying out a first treatment on the surface of the The following relation is established by solving the line segment ratio in the shot picture and the constructed right triangle:
wherein alpha isFOV/2，FOVIs thatVRThe field angle of the helmet; wherein the first handle coordinatesC(c x ,c y ,c z )Second helmet coordinatesH'(h x ' ,h y ' ,h z ' )The record is made by the VR device,the picture shot in the step S4 is directly calculated; according to the above relation, the relation can be listed(o x ,o y ,o z )In equation (1) of (2),
(1)
in the triangle constructed in step S5,OC⊥OH'i.e.Can list about(o x ,o y ,o z )Equation (2) of (2):
(2)
in the triangle constructed in step S5，O、H'、 HeOn the same straight line, i.e，
Three concerns are available(o x ,o y ,o z )Is a linear equation of (2):
(3)
solving the above equations (1), (2) and (3) in a combined way to obtain;
The method also comprises the step of correcting the distance h, wherein the correction formula is as follows:
（4）
wherein the first helmet coordinatesH(h x ,h y ,h z )First, theTwo helmets coordinatesH'(h x ' ,h y ' ,h z ' )Recording by the VR device;
further comprising calculating a final human height:
（5）
wherein,representing the distance between the center position of the pupils of the eyes of the human body and the top position of the head,/for the eyes>Is a statistical value.
2. The XR-based height measurement method of claim 1, wherein: the distance between the center position of the pupils of the two eyes of the human body and the top position of the head is as follows:
substituting formula (5) can give:
(6)。
CN202311731499.9A 2023-12-15 2023-12-15 Height measurement method based on XR Active CN117398088B (en)

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