A method and device for measuring parameters of a bicycle rider's posture

Abstract

The present invention provides a method and device for measuring the posture parameters of a bicycle controller while riding and pushing a bicycle. The method facilitates the measurement of the posture parameters of a bicycle controller while riding and pushing a bicycle in a low-cost manner in a laboratory by students in school. Specifically, a method for measuring the posture parameters of a bicycle controller while riding and pushing a bicycle is provided. The method comprises: attaching reflective stickers to the right hip bone, patella, ankle joint, and left patella and ankle joint of the bicycle controller as positioning points for the center of subsequent images; when the controller rides or pushes the bicycle through the range of a video recording device, a posture image of the target controller is obtained through the video recording device (camera); the video is imported into the image center (Simi Motion motion software), and the position of the lower limb positioning points of the target controller is read frame by frame to obtain the posture parameters of the controller while riding and pushing a bicycle at different knee bending angles and different frame numbers. Based on the technical solution provided by this application, the posture parameters of the controller during riding or pushing a bicycle can be measured.

Description

Technical Field

[0001] The present invention relates to the field of bicycle traffic safety, and in particular to a method and device for measuring parameters of a bicycle rider's posture. Background Art

[0002] With the rapid development of the modern economy, the large number of cars and bicycles in my country, the increasing mixed traffic of cars and two-wheeled vehicles, and the emergence of the shared bicycle industry have led to an increasing incidence and casualty rate of car-bicycle accidents in my country, and the bicycle road safety situation is relatively severe.

[0003] At present, in order to prevent and reduce the occurrence of bicycle accidents, in the case of bicycles crossing motor vehicle lanes, relevant regulations stipulate that bicycle operators should get off and push the bicycle when crossing motor vehicle lanes; however, the existing research has not given a reasonable explanation for the implementation of this regulation, and it lacks persuasiveness in the specific implementation process. The present invention measures the posture parameters of bicycle operators in a low-cost manner, providing data support for summarizing the typical postures corresponding to riding and pushing, and then lays a data foundation for the study of human body injuries between typical riding and pushing postures, thereby providing data support for the need to get off and push the bicycle when crossing motor vehicle lanes. The present invention is completed in a laboratory at night. By sticking reflective stickers on parts of the human body, bright spots are formed by reflection of the light source under direct strong light, which is easy for software to identify and regard as positioning points, thereby obtaining posture parameters under different frame numbers. This device is convenient and simple, easy to implement, can reduce costs, and is convenient for students to measure the riding and pushing posture of the target operator at school. Summary of the Invention

[0004] To this end, the present invention designs a method and device for measuring the posture parameters of a person controlling a bicycle, so as to solve the problem of measuring the posture parameters of a person controlling a bicycle at a low cost.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a method for measuring the parameters of a person's posture when riding a bicycle.

[0006] Includes the following devices:

[0007] Infrastructure: A 7m long and 5m wide experimental site with a wall; reflective tape, a tripod, an outdoor high-intensity flashlight, and a bicycle;

[0008] Video recording equipment: camera;

[0009] Image Center: Kinematics simulation software Simi Motion;

[0010] The steps of measuring the parameters of the bicycle control person's riding posture are as follows:

[0011] S1: Prepare 10 sheets of reflective tape and cut them into 2×2 cm squares. When facing the laboratory wall, establish an xy coordinate system with the lower left corner as the starting point. The x-axis is parallel to the wall, with the right direction as the positive direction, and the y-axis is perpendicular to the wall, with the upward direction as the positive direction. With 1 meter as a unit, stick the reflective tape at (0, 0), (0, 1), (1, 1), and (1, 0) respectively. To ensure that the image center is correct, use these four points for video calibration. Determine the conversion ratio between video pixels and actual distance based on the distance between the four points.

[0012] S2: Select a bicycle operator and bicycle that meet the experimental requirements and apply reflective tape to the operator at the following locations: the right hip bone, patella, and ankle joint; and the left patella and ankle joint. Measuring the cycling posture parameters is equivalent to measuring the operator's knee flexion angle. The knee flexion angle is composed of the hip bone, patella, and ankle joint. Therefore, applying reflective tape to these locations facilitates the determination of the positioning point at the center of the image and the measurement of the knee flexion angle.

[0013] S3: Site setup: Place a tripod in the center of the site, 4 meters away from the wall, and adjust it to 1.5 meters above the ground. Secure the camera to the tripod, keeping the lens parallel to the ground and perpendicular to the wall. Ensure the operator and bicycle are completely within the recording range of the camera.

[0014] S4: Conduct the experiment. When conducting the pushing experiment, the controller stands at a vertical distance of 1m from the wall and 3m from the camera, holding the bicycle and parallel to the wall. The controller stands on the right side of the bicycle close to the camera, and ensures that the initial position of the controller and the bicycle appear on the leftmost side of the camera's shooting range facing the wall. When the controller pushes the bicycle to the right, maintain a constant speed until it leaves the camera's shooting range; when conducting the riding experiment, draw a 2cm wide and 7m long line on the ground at 1m and 1.5m from the wall and ensure it is parallel to the wall. The controller needs to ride buffer 5m outside the experimental site first. When riding steadily, slowly enter the camera's shooting range along the middle area between the two lines, and ride from the leftmost side of the camera's shooting range facing the wall until leaving the shooting range; in both riding and pushing experiments, a volunteer is required to stand next to the camera holding a strong flashlight. When the bicycle controller moves within the shooting range, ensure that the light always shines on the bicycle controller; at the beginning of the riding and pushing experiments, the camera starts working and records the entire experimental process;

[0015] S5: Data reading: The entire experimental process recorded by the video equipment is imported into the image center for reading. The location of the reflective sticker attached to the bicycle controller's body is regarded as a point, and the angle formed by the hip bone, patella and ankle joint is regarded as the knee bending angle. As the controller performs the push-off movement to the right, the knee bending angle is read frame by frame to obtain the controller's push-off posture parameters.

[0016] Preferably, the reflective stickers are used to measure the parameters of the bicycle controller's riding and pushing posture, which is convenient for college students to measure the parameters of the bicycle controller's riding and pushing posture at a low cost.

[0017] Preferably, the experiment is conducted at night because the light reflected by the reflective sticker under strong direct sunlight at night is very obvious, making it easier to read the positioning point in the center of the image.

[0018] Preferably, when conducting the experiment, a volunteer is selected to stand next to the camera holding a strong flashlight, with the strong flashlight positioned at the same height as the volunteer's head, to ensure that the strong light is always shone on the bicycle controller when the bicycle controller moves within the shooting range.

[0019] Preferably, a strong flashlight is used because the reflective tape needs to be directly illuminated by strong light in a dark environment to have obvious reflective highlights, ensuring that the positioning point can be clearly found in the center of the image.

[0020] Preferably, a camera is selected with a tripod having a quick-release plate for convenient placement of the camera. Mounting the camera on the quick-release plate can ensure that the camera shoots smoothly without shaking. The camera is regarded as a fixed point, and the wide-angle mode is turned on. The shooting range is like a fan, and the experimental process from the controller entering to leaving the shooting range is perfectly recorded without lens shaking or offset.

[0021] Preferably, white reflective tape is used to ensure that in an indoor environment at night, under direct strong light, the reflective effect of white reflective tape is more obvious than reflective tape of other colors and is easier to be recognized by software.

[0022] Preferably, indoor experimental sites are selected to facilitate college students to find experimental sites through on-campus resources.

[0023] Preferably, when the controller conducts a riding experiment, it is necessary to perform riding buffering 5m outside the experimental site. This is because when riding a bicycle, the handlebars and speed are unstable, which will cause the bicycle to sway from side to side. Therefore, riding buffering is required. When the handlebars and speed are stable and enter the shooting range, the entire experimental process can be fully recorded.

[0024] Preferably, when the controller conducts a riding experiment, two lines 2 cm wide and 7 m long are arranged on the test site to ensure that the bicycle controller enters the shooting range after the riding buffer. The bicycle controller can always ride along the middle area between the two lines to prevent the riding from deviating. When riding, keep riding as slow as possible through the shooting range to ensure that the positioning point can be clearly read in the center of the image.

[0025] Preferably, when selecting a bicycle controller, he or she is required to wear black clothing to ensure that the reflective point can be identified in the center of the image, and black clothing can better highlight the position of the reflective sticker under strong light.

[0026] Preferably, when conducting the experiment, the controller needs to maintain a constant speed through the shooting range to ensure that an accurate positioning point can be obtained in the center of the image.

[0027] Preferably, the entire experimental process is recorded by a video recording device and then imported into the image center. The posture parameters of the bicycle controller at different frame rates can be read based on the knee bending angle formed by the change in the position of the reflective tape.

[0028] Preferably, the present invention provides a method and device for measuring parameters of a bicycle rider's pushing posture, comprising the following steps:

[0029] Put reflective tape on the wall and at the location determined by the controller, place the tripod and camera in the designated location, and have volunteers stand at the designated location holding flashlights;

[0030] The person operating the bicycle, wearing black clothing, pushes or rides the bicycle into the leftmost part of the camera's shooting range facing the wall, and moves from left to right until they leave the shooting range, completing the recording.

[0031] Import the video into the image center and obtain the positions of different positioning points (reflective tape) frame by frame to obtain the knee bending angle at different frame numbers;

[0032] Record different knee bending angles and measure the riding posture parameters at different frame rates.

[0033] As described above, the present invention provides a method and device for measuring the parameters of a person's riding and pushing posture when controlling a bicycle, which has the following beneficial effects: college students can measure the parameters of a person's riding and pushing posture when controlling a bicycle in a low-cost manner, provide data support for summarizing typical postures corresponding to riding and pushing, and then lay a data foundation for comparing human body injuries between typical riding and pushing postures, thereby providing data support for the need to get off the bicycle and push it when crossing a motor vehicle lane. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of an overall cycling application scenario provided by an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the position where the controller sticks the reflective tape according to an embodiment of the present invention;

[0036] Figure 3 The present invention provides a flow chart of a method for measuring parameters of a bicycle's riding posture.

[0037] In the picture:

[0038] 1-Bicycle controller; 2-Bicycle; 3-Camera; 4-High-intensity flashlight; 5-Venue; 6-Wall; 7-Two lines required for the cycling experiment; 8-Reflective tape. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in the description. The present invention can also be implemented or applied through different specific embodiments. The details in this description can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the embodiments and embodiments can be combined with each other unless there is a conflict.

[0040] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention, and the figures only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the form, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0041] See also Figure 1 The present invention provides a method for measuring the parameters of a bicycle rider's posture when controlling the bicycle:

[0042] Includes the following devices:

[0043] Infrastructure: A 7m long and 5m wide experimental site with a wall; reflective tape, a tripod, an outdoor high-intensity flashlight, and a bicycle;

[0044] Video recording equipment: camera;

[0045] Image Center: Kinematics simulation software Simi Motion;

[0046] The steps of measuring the parameters of the bicycle control person's riding posture are as follows:

[0047] S1: Prepare 10 sheets of reflective tape and cut them into 2×2 cm squares. When facing the laboratory wall, establish an xy coordinate system with the lower left corner as the starting point. The x-axis is parallel to the wall, with the right direction as the positive direction, and the y-axis is perpendicular to the wall, with the upward direction as the positive direction. With 1 meter as a unit, stick the reflective tape at (0, 0), (0, 1), (1, 1), and (1, 0) respectively. To ensure that the image center is correct, use these four points for video calibration. Determine the conversion ratio between video pixels and actual distance based on the distance between the four points.

[0048] S2: Select a bicycle operator and bicycle that meet the experimental requirements and apply reflective tape to the operator at the following locations: the right hip bone, patella, and ankle joint; and the left patella and ankle joint. Measuring the cycling posture parameters is equivalent to measuring the operator's knee flexion angle. The knee flexion angle is composed of the hip bone, patella, and ankle joint. Therefore, applying reflective tape to these locations facilitates the determination of the positioning point at the center of the image and the measurement of the knee flexion angle.

[0049] S3: Site setup: Place a tripod in the center of the site, 4 meters away from the wall, and adjust it to 1.5 meters above the ground. Secure the camera to the tripod, keeping the lens parallel to the ground and perpendicular to the wall. Ensure the operator and bicycle are completely within the recording range of the camera.

[0050] S4: Conduct the experiment. When conducting the pushing experiment, the controller stands at a vertical distance of 1m from the wall and 3m from the camera, holding the bicycle and parallel to the wall. The controller stands on the right side of the bicycle close to the camera, and ensures that the initial position of the controller and the bicycle appear on the leftmost side of the camera's shooting range facing the wall. When the controller pushes the bicycle to the right, maintain a constant speed until it leaves the camera's shooting range; when conducting the riding experiment, draw a 2cm wide and 7m long line on the ground at 1m and 1.5m from the wall and ensure it is parallel to the wall. The controller needs to ride buffer 5m outside the experimental site first. When riding steadily, slowly enter the camera's shooting range along the middle area between the two lines, and ride from the leftmost side of the camera's shooting range facing the wall until leaving the shooting range; in both riding and pushing experiments, a volunteer is required to stand next to the camera holding a strong flashlight. When the bicycle controller moves within the shooting range, ensure that the light always shines on the bicycle controller; at the beginning of the riding and pushing experiments, the camera starts working and records the entire experimental process;

[0051] S5: Data reading: The entire experimental process recorded by the video equipment is imported into the image center for reading. The location of the reflective sticker attached to the bicycle controller's body is regarded as a point, and the angle formed by the hip bone, patella and ankle joint is regarded as the knee bending angle. As the controller performs the push-off movement to the right, the knee bending angle is read frame by frame to obtain the controller's push-off posture parameters.

[0052] At present, the number of cars and bicycles in my country is increasing year by year, and the traffic situation in my country is becoming increasingly severe. The phenomenon of cars and bicycles mixing is still common, which greatly increases the potential for accidents and conflicts. To reduce the occurrence of car-bicycle accidents on motor vehicle lanes, according to relevant regulations, when crossing a motor vehicle lane, the rider should dismount and push the bicycle. However, the existing research on the implementation of this regulation has not provided a reasonable explanation, and lacks persuasiveness in the specific implementation process. Therefore, the present invention can facilitate students to independently complete the measurement of bicycle control posture parameters at low cost and using on-campus resources, providing data support for summarizing typical postures corresponding to riding and pushing, and laying a data foundation for comparing human injuries between typical riding and pushing postures, thereby providing data support for the need to dismount and push the bicycle when crossing a motor vehicle lane. In addition, the present invention attaches reflective stickers to the human body, forms a positioning point by reflecting light under strong direct light, and uses software to identify the positioning point to measure the parameters of the control posture of the rider. This device is convenient and simple, easy to implement, and low-cost, making it convenient for students to measure the target control posture of the rider on campus.

[0053] As shown in the figure, the present invention provides a method and device for measuring parameters of a bicycle rider's posture control, which includes the following steps:

[0054] S10: Complete the preparations before the experiment.

[0055] Select a bicycle controller and bicycle that meet the experimental requirements, select an experimental site that meets the requirements, place the required equipment in the exact locations mentioned above, stick reflective tape on the wall and the exact location of the controller, and have volunteers stand in the designated location holding flashlights;

[0056] S20: When the bicycle operator controls the bicycle to ride within the range of the video recording device, the operator first performs a buffer ride outside the experimental site. When the operator can ride steadily, the operator slowly enters the shooting range and leaves the shooting range. The entire experimental process is recorded smoothly by the video recording device.

[0057] S30: The bicycle operator controls the bicycle to push the bicycle within the shooting range of the video equipment at a constant speed until it leaves the shooting range, and the entire experimental process is smoothly recorded by the video equipment;

[0058] S40: Import the recorded video into the image center, read it frame by frame, obtain the location of the positioning point (reflective sticker), and thus obtain the knee bending angle of the control person's lower limb and the posture parameters under different frame numbers.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, any equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed herein shall be covered by the claims of the present invention.

Claims

1. A method for measuring the parameters of a person's posture when riding a bicycle, characterized in that: Includes the following devices: Infrastructure: A 7m long and 5m wide experimental site with a wall; reflective tape, a tripod, an outdoor high-intensity flashlight, and a bicycle; Video recording equipment: camera; Image Center: Kinematics simulation software Simi Motion; The steps of measuring the parameters of the bicycle control person's riding posture are as follows: S1: Prepare 10 sheets of reflective tape and cut them into 2×2 cm squares. When facing the laboratory wall, establish an xy coordinate system with the lower left corner as the starting point. The x-axis is parallel to the wall, with the right direction as the positive direction, and the y-axis is perpendicular to the wall, with the upward direction as the positive direction. With 1 meter as a unit, stick the reflective tape at (0, 0), (0, 1), (1, 1), and (1, 0) respectively. S2: Select a bicycle operator and bicycle that meet the experimental requirements, and attach reflective stickers to the operator at the following locations: the right hip bone, patella, and ankle joint, and the left patella and ankle joint. S3: Site setup: Place a tripod in the center of the site, 4 meters away from the wall, and adjust it to 1.5 meters above the ground. Then, secure the camera to the tripod, keeping the camera lens parallel to the ground and perpendicular to the wall. S4: Conduct the experiment. When conducting the pushing experiment, the controller stands at a vertical distance of 1m from the wall and 3m from the camera, holding the bicycle and parallel to the wall. The controller stands on the right side of the bicycle close to the camera, and ensures that the initial position of the controller and the bicycle appear on the leftmost side of the camera's shooting range facing the wall. When the controller pushes the bicycle to the right, maintain a constant speed until it leaves the camera's shooting range; when conducting the riding experiment, draw a 2cm wide and 7m long line on the ground at 1m and 1.5m from the wall and ensure it is parallel to the wall. The controller needs to ride buffer 5m outside the experimental site first. When riding steadily, slowly enter the camera's shooting range along the middle area between the two lines, and ride from the leftmost side of the camera's shooting range facing the wall until leaving the shooting range; in both riding and pushing experiments, a volunteer is required to stand next to the camera holding a strong flashlight. When the bicycle controller moves within the shooting range, ensure that the light always shines on the bicycle controller; at the beginning of the riding and pushing experiments, the camera starts working and records the entire experimental process; S5: Data reading: The entire experimental process recorded by the video equipment is imported into the image center for reading. The location of the reflective sticker attached to the bicycle controller's body is regarded as a point, and the angle formed by the hip bone, patella and ankle joint is regarded as the knee bending angle. As the controller performs the push-off movement to the right, the knee bending angle is read frame by frame to obtain the controller's push-off posture parameters.

2. The method for measuring bicycle control posture parameters according to claim 1, characterized in that: Select white reflective stickers and stick them on the target person's body as identification points.

3. The method for measuring bicycle control posture parameters according to claim 1, characterized in that: When the controller conducts a cycling experiment, he or she must first perform a buffer ride outside the experimental site, and then slowly pass through the camera's shooting range.

4. The method for measuring bicycle control posture parameters according to claim 1, characterized in that: When shooting in the experimental field at night, a volunteer needs to be selected to stand next to the camera, holding a strong flashlight at the same height as his head.

5. The method for measuring bicycle control posture parameters according to claim 1, characterized in that: The target controllers rode on push carts and entered from the left side of the camera's shooting range facing the wall and left from the right side.

6. The method for measuring bicycle riding posture parameters according to claim 1, characterized in that: Bicycle controllers are required to wear black clothing for the experiment.

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