CN115177927B - Sit-up testing device and detection method - Google Patents

Abstract

The invention relates to a sit-up testing device and a testing method. The method comprises the steps of collecting test videos of a subject in a specified time by using a camera, and identifying key points of human bones of the subject; in the test time, judging and detecting the motion state of the subject, measuring the distance d between the skeletal point of the elbow and the skeletal point of the patella, counting if d is less than or equal to 5cm, and recognizing whether the elbow of the subject touches the knee when the included angle alpha between the first rule line L1 and the second rule line L2 is from more than or equal to 120 degrees to less than or equal to 55 degrees as a sit-up action; however, if the test time is longer than the prescribed time, the counting is stopped and the test is ended. The invention solves the defects of the traditional manual test, instrument test and sit-up test based on a camera head.

Description

Sit-up testing device and detection method

Technical Field

The invention belongs to the technical field of sports equipment, and particularly relates to a sit-up testing device and a sit-up testing method.

Background

Sit-ups are general items of student physical health tests, and are mainly used for testing the arm strength and the endurance of the waist of students, and the conventional sit-ups are generally completed through manual work and sit-ups testers.

1. Manual testing

The subject lies on the back on the pad with the legs slightly separated and the knee bent at an angle of about 90 degrees, with the two fingers being attached to the back of the brain. The other partner presses his ankle joint to fix the lower limb. The subject sits with both elbows touching or exceeding the knees once. The two shoulder blades must be cushioned in supine position. When the tester issues a "start" password while starting the meter, the number of completions in 1 minute is recorded. At the end of 1 minute, the subject had seated but had not reached the knees, and was accurate to the units.

Manual measurement has the following defects: the test result of manual measurement is directly related to the basic quality and skill of the measuring staff, and the measured results are inconsistent due to inconsistent subjective standards of different measuring staff. In particular, whether the sit-up is standard or not, whether the limbs are in place or not, and whether the judgment standard of each measuring person is inconsistent, and whether the rule understanding is tight or not. Under the condition that a large number of testers participate in the test together, one tester needs to be configured at one test position, the workload of the testers is large, the results need to be recorded manually, and the test efficiency is low.

2. Instrument testing

The sit-up test equipment commonly used today includes a sit-up plate, a low sensor and a high sensor.

When the device is used, a tested person lies on the sit-up board, then hooks two feet on the foot fixing support, the main control device is started to count down, the body of the tested person triggers the low-level sensor firstly in the upward tilting process of the tested person, then the body of the tested person is transmitted to the main control device, the body of the tested person continues to tilt up until the body of the tested person triggers the high-level sensor, then the body of the tested person is transmitted to the main control device, and two signals form an effective signal. In the process of lying down, the body triggers the high-level sensor firstly, then the downward movement triggers the low-level sensor, and at the moment, the sequence of the two signals is reversed, so that the counting can not be performed.

Such as: infrared sensing measurement relies on the cooperation of an infrared emitter and an infrared receiver. When sit-up test personnel are in the middle of infrared transmitter and infrared receiver, the infrared that infrared transmitter transmitted is sheltered from the reflection by the test personnel, and infrared receiver received the infrared signal of reflection, shelter from reflection position department and be sit-up test personnel shoulder or elbow position, infrared sensing measurement just simply judges whether the shoulder is to certain position, and whether the elbow is to certain position to calculate the achievement.

3. Sit-up tester test based on camera (fig. 1)

(1) The subject lies on the back on the pad, the two legs are separated slightly, the feet are fixed on the instrument of the pad, the knee is bent at an angle of about 90 degrees, the two fingers are stuck to the brain in an intersecting way, and the waist is provided with a special electronic test waistband. Before sitting, the tester confirms the IC card of the tested person by using the instrument, and when the instrument is heard to send out a 'drop-drop' prompt, the tested person starts sitting.

(2) The instrument automatically counts 1 only when the sitting and the tilting actions are consistent and all have prompt tones. If the continuous upward and downward sitting actions are not in place and no prompting sound exists, the number is not counted.

The defects of the existing instrument test are that: the infrared test mode has the advantages that the reaction speed of a common infrared sensor is low, the quantum type sensor is high in price, more devices are needed, the structure is complex, and the measurement is inaccurate due to the fact that the devices are easily shielded by other parts of a body; the photoelectric sensor mode has poor environmental adaptability, can be easily polluted and disabled without being used in a sealed environment, and needs a large amount of machinery, is complex and expensive, and the tester is bound on a tested person to cause discomfort of the tested person and inaccurate measurement. The test principle of sit-up test instrument that can conveniently carry is too simple, does not satisfy the test requirement, and the accuracy is relatively poor in the test process.

Disclosure of Invention

The invention provides a sit-up test device and a detection method, and aims to solve the defects of the existing manual test, instrument test and sit-up test based on a camera.

The technical scheme is as follows:

a sit-up training test device is characterized in that a back cushion, a leg support, a foot rest storage groove, a foot rest, one or more telescopic rods and a controller storage groove are sequentially arranged on the upper surface of a bottom plate of the test device, a back plate groove is formed in the bottom plate, the back plate groove corresponds to the back cushion in position, a boosting assembly is arranged in the back plate groove, one end of the boosting assembly is fixed on the bottom surface of the back plate groove, the other end of the boosting assembly is fixed on a back support plate, the back support plate is hinged to the end of the back plate groove, the back cushion is placed on the upper surface of the back support plate, the foot rest is hinged to a body of the bottom plate and can be buckled into the foot rest storage groove, the end of the telescopic rod is hinged to a controller clamp, the controller is fixedly buckled into the controller storage groove, the side telescopic rod is fixedly connected to the side surface of the bottom plate, and a camera is fixedly arranged on the end of the side telescopic rod.

Further, the boosting assembly comprises an air cylinder, an air cylinder tail end hinge, an air cylinder top end hinge and a back plate supporting base, wherein the tail end of the air cylinder is fixed on the bottom surface of the back plate groove through the hinged air cylinder tail end hinge, the top end of an air cylinder shaft of the air cylinder is fixed on the back plate supporting base through the hinged air cylinder top end hinge, and the back plate supporting base is fixed on the back supporting plate.

A detection method of sit-up training test device comprises the following steps:

firstly, identifying images, namely collecting test videos of a subject within a specified time by using a camera, and extracting and identifying key points of human bones of the subject on the images of the test videos, wherein the key points comprise bone points of head, waist, elbow and knee parts; the first rule line L1 is defined from the bone point of the head to the bone point of the waist, and the second rule line L2 is defined from the bone point of the waist to the bone point of the knee;

judging and detecting the motion state of a subject in the test time, measuring the distance d between the skeletal points of the elbow and the skeletal points of the patella, counting if d is less than or equal to 5cm, taking a sit-up action when the included angle alpha between the first rule line L1 and the second rule line L2 is from more than or equal to 120 degrees to less than or equal to 55 degrees, and identifying whether the elbow of the subject touches the knee;

step three, if the test time is longer than the specified time, stopping counting, and ending the test; the controller displays the number of times the subject has completed within a prescribed time.

The beneficial effects are that: the invention can be used for not only performing sit-up tests, but also being used as a tool for assisting exercise; meanwhile, the labor is saved, the equipment is simple, the cost is low, the environment adaptability is high, the harm to a subject is avoided, the detection speed is high, the precision is high, and the real-time detection can be performed.

Drawings

FIG. 1 is a camera-based sit-up tester;

FIG. 2 is a schematic diagram of the structure of the device;

FIG. 3 is a left side view of the structure of the device;

FIG. 4 is a front view of the structure of the present device;

FIG. 5 is a top view of the present device;

FIG. 6 is a schematic flow chart of the method;

FIG. 7 is a schematic diagram illustrating the definition of a first rule line L1 and a second rule line L2;

reference numerals in the drawings: 1. the back cushion, 2, the cushion, 2,3, the leg holds in the palm, 4, the foot rest, 5, controller storage tank, 6, apron handle, 7, flexible apron, 8, foot rest storage tank, 9, bottom plate, 9-1, side telescopic link, 10, controller clamp, 11, the controller, 12, back backup pad, 13, backplate catching groove, 14, cylinder groove, 15, backplate support base, 16, cylinder top hinge, 17, cylinder axle, 18, cylinder, 19, cylinder tail end hinge, 20, backplate groove, 21, telescopic link, 22, camera, 23, telescopic link storage tank.

Detailed Description

The invention is described in more detail below with reference to the drawings accompanying the specification.

As shown in fig. 2 to 5, a sit-up training test apparatus includes: the back cushion 1, the cushion 2, the leg rest 3, the foot rest 4, the controller accommodating groove 5, the cover plate handle 6, the telescopic cover plate 7, the foot rest accommodating groove 8, the bottom plate 9, the side telescopic rod 9-1, the controller clamp 10, the controller 11, the back supporting plate 12, the back plate buckling groove 13, the cylinder groove 14, the back plate supporting base 15, the cylinder top end hinge 16, the cylinder shaft 17, the cylinder 18, the cylinder tail end hinge 19, the back plate groove 20, the telescopic rod 21, the camera 22 and the telescopic rod accommodating groove 23.

The back cushion 1, the cushion 2, the leg rest 3, the foot rest containing groove 8, the foot rest 4, one or more telescopic rods 21 and the controller containing groove 5 are sequentially arranged on the upper surface of the bottom plate 9, a back plate groove 20 is formed in the bottom plate 9, the back plate groove 20 corresponds to the back cushion 1 in position, a boosting component is arranged in the back plate groove 20, one end of the boosting component is fixed on the bottom surface of the back plate groove 20, the other end of the boosting component is fixed on the back support plate 12, the back support plate 12 is hinged on the body of the bottom plate 9, the back cushion 1 is placed on the upper surface of the back support plate 12, the cushion 2 does not influence the opening and closing of the back support plate 12, the back support plate 12 is consistent with the back plate groove 20 in size, the back support plate 12 can be connected with one side of the back plate groove 20 through rigid rotating shafts such as hinges, and can be freely opened and closed in the 180 DEG in the positive direction by taking the connecting side as the axis; the cylinder groove 14 is formed in the middle of the inner surface of the back support plate 12, so that the back support plate 12 can be completely combined into the back plate groove 20, and the upper surface of the back support plate and the upper surface of the bottom plate 9 are in a horizontal plane. The foot rest 4 is hinged on the body of the bottom plate 9 and can be buckled into the foot rest containing groove 8, and the leg rest 3 does not shade the foot rest containing groove 8; in this embodiment, a pair of telescopic rods 21 are disposed at the tail end of the upper surface of the bottom plate 9, the bottom ends of the telescopic rods are inserted into telescopic rod receiving slots 23 formed in the upper surface of the bottom plate 9, and the telescopic rods 21 can be fully retracted into the telescopic rod receiving slots 23 in a fully retracted state. The upper end part of the telescopic rod 21 is hinged with the controller clamp 10, the controller clamp 10 can be folded by 90 degrees towards the tail end of the bottom plate 9, the controller 11 is fixed in the controller clamp 10, the controller 11 can be buckled into the controller accommodating groove 5, and when the telescopic rod 21 clamps the controller 11 and contracts, the controller 11 can be accommodated into the controller accommodating groove 5 at the tail end of the bottom plate 9 without taking down the controller 11 from the controller clamp 10 and folding back by 90 degrees; in order to protect the controller 11, a telescopic cover plate 7 is slidably connected above the controller accommodating groove 5, and a cover plate handle 6 is arranged at the edge of the upper cover plate in order to facilitate the opening and closing of the telescopic cover plate 7. The side face of the bottom plate 9 is fixedly connected with a side face telescopic rod 9-1, and a camera 22 is fixed on the end part of the side face telescopic rod 9-1. The side telescopic rod 9-1 can be telescopic transversely parallel to the ground to the right as a holder for the camera 22. The camera 22 can be fixed at the top end of the side telescopic rod 21, and the telescopic length is suitable according to whether the camera 22 can completely put a tester into the view-finding frame.

The controller 11 is connected with the air cylinder 18, the side telescopic rod 9-1, the telescopic rod 21 and the camera 22, under the forward assistance and reverse countermeasure modes, the controller 11 only controls the air cylinder 18, can adjust the telescopic travel time of the air cylinder shaft 17, does not need to call the camera 22, under the normal test mode, the controller 11 does not control the air cylinder 18, the air cylinder shaft 17 is in a contracted state, the back support plate 12 is completely contained in the back plate groove 20, the upper surface of the back support plate is ensured to be a flat surface except the back cushion 1 and the cushion 2, and the camera 22 is only called to perform algorithm operation.

The boosting assembly comprises an air cylinder 18, an air cylinder tail end hinge 19, an air cylinder top end hinge 16 and a back plate supporting base 15, wherein the tail end of the air cylinder 18 is fixed on the bottom surface of a back plate groove 20 through the hinged air cylinder tail end hinge 19, the top end of an air cylinder shaft 17 of the air cylinder 18 is fixed in an air cylinder groove 14 on the inner surface of a back supporting plate 12 through the hinged air cylinder top end hinge 16, specifically, the air cylinder top end hinge 16 is fixed in the air cylinder groove 14 on the inner surface of the back supporting plate 12 through the back plate supporting base 15 which is rigidly connected with the air cylinder top end hinge 16, and the back supporting plate 12 is jacked up and fallen back by taking the connecting edge as the axis through the expansion and contraction of the air cylinder shaft 17 when the air cylinder 18 does work. The back support plate 12 is opened in the middle of the opening and closing end and is provided with a back plate buckling groove 13, so that the back support plate 12 can be conveniently lifted and closed manually.

The controller 11 uses the human posture recognition function provided by the mediαpipe. MediαPipe is a framework for building machine learning pipelines for processing video, audio, and the like. The machine learning pipeline employs a two-step detector-tracker ML pipeline, which has proven to be effective in our mediαpippe H αnds and mediαpipe fαce Mesh solutions. Using the detector, the tunnel first locates the person/gesture region of interest ROI within the frame. The tracker then predicts pose markers and segmentation masks within the ROI using the ROI crop frame as input. Note that for the video use case, the detector is invoked only when needed, i.e. for the first frame and when the tracker is no longer able to recognize that a body posture in the previous frame is present. For other frames, the pipeline derives the ROI only from the pose markers of the previous frame. The pipeline is implemented as a MediαPipe graph, which uses the pose landmark subgraphs from the pose landmark module and renders using a dedicated pose renderer subgraph. The gesture landmark subgraph internally uses the gesture detection subgraph from the gesture detection module.

As shown in fig. 6, a method for detecting a sit-up training test device includes the steps of:

firstly, recognizing an image, namely collecting test videos of a subject within a specified time by using a camera 22, and extracting and recognizing key points of human bones of the subject on the images of the test videos, wherein the key points comprise bone points of head, waist, elbow and knee parts; the first rule line L1 is defined from the bone point of the head to the bone point of the waist, and the second rule line L2 is defined from the bone point of the waist to the bone point of the knee;

before the test starts, the subject lies on his back on the cushion as required by his posture. After the test is started, the time display area on the host computer is subjected to 5 seconds to prepare for countdown display, and after the timing is finished, the processor controls the buzzer to send out prompt tone to prompt the test to start, and meanwhile, the time display area is subjected to test timing display, and the counting is started immediately. While the camera 22 transmits the captured video frame numbers to the processing unit of the controller 11.

Judging and detecting the motion state of a subject in the test time, measuring the distance d between the skeletal point of the elbow and the iliac point of the patella, counting if d is less than or equal to 5cm, performing sit-up action when the included angle alpha between the first rule line L1 and the second rule line L2 is from more than or equal to 120 degrees to less than or equal to 55 degrees, and identifying whether the elbow of the subject touches the knee;

action requirements for sit-up training: the subject lies on the back on the pad, the two legs are slightly separated, the knee bending is about 90 degrees, the feet are flatly placed on the ground, the two fingers are crossly attached to the brain, the ankle joints of the subject are ensured to be pressed to ensure the fixation of the lower limbs, the abdominal muscles are utilized to shrink to quickly form a sitting posture, meanwhile, the elbow joints touch or exceed the two knees, and the effective times of the subject in one minute are recorded.

Based on the action requirement of sit-up training, as shown in fig. 7, the present invention assumes that the included angle between the lines of three key points of the subject, i.e., the included angle between the first rule line L1 and the second rule line L2, is α, determines that the subject is lying down when α > =120°, determines sitting up when α < =55°, and completes a standard action when α varies from 120 ° or more to 55 ° or less and the distance d between the elbow and the knee is 5cm or less.

In the present invention, after the camera 22 transmits the captured video frame number to the processing unit, the program starts to determine whether the test time is within one minute, if so, it starts to determine whether the initial state of the motion of the subject is a lying state, if not, it performs the next motion determination, if so, it then determines whether the state of the subject is a sitting state, if so, it performs the next determination, otherwise, it returns to the initial step. And judging whether the elbow of the subject contacts the knee or not, judging the action by the d value, if d is less than or equal to 5cm, enabling the action to meet the standard, counting the total number of the actions, judging the next action, and making a prompt tone for finishing timing by the buzzer.

And thirdly, stopping counting if the test time is longer than the specified time, and ending the test. The controller 11 displays the number of times the subject has completed within a prescribed time.

The using mode is as follows:

the sit-up training test device integrates multiple functions of forward sit-up power-assisted exercise, reverse back-lying waist-abdomen countermeasure exercise, teenager physique test standard sit-up test and the like under the requirements of national physique detection.

Example 1 forward sit-up assistance

Sit-ups are still one of the main items of physical testing at present, but many subjects cannot reach the standard in a specified time due to weak waist-abdomen core strength, so that the power-assisted sit-up training function is designed.

According to the function, the extension travel time and the extension travel length of the cylinder shaft of the power-assisted cylinder are adjusted, the extension travel time and the extension travel length of the cylinder shaft 17 of the cylinder 18 are adjusted, the cylinder shaft 17 can extend out rapidly, the back plate support base 15 fixed in the cylinder groove 14 is jacked up, the back support plate 12 is jacked up to form an included angle of 50 degrees with the bottom plate 9, force is transmitted to the back of a human body, the waist and abdomen stress is properly reduced, the sit-up is relatively easy, and the power-assisted purpose is achieved.

The subject sits on the cushion 2, lies on the back cushion 1, slightly separates two legs, bends the knee to be about 90 degrees, and the foot is kept flat on the ground, buckles the foot rest 4, guarantees that its ankle joint or instep are held to guarantee the fixed of low limbs, and after two fingers are alternately pasted on the brain, utilizes the abdominal muscle to shrink, becomes the position of sitting rapidly, and initially, the subject is because of waist and abdomen strength is not enough, can borrow the inertia of the back backup pad 12 that is jacked by cylinder 18, makes the limbs on oneself become the position rapidly, and elbow joint touches or surpasses both knees simultaneously, and waist and abdomen exert force when leaning back backward makes the health slowly back lie, so reciprocating, can realize the helping hand effect.

EXAMPLE 2 reverse back lumbar-abdominal countermeasures

The device is designed to exercise waist and abdomen force in two directions, and besides the normal sit-up assisting training, the backward leaning countermeasure training is added, so that different muscle groups of the waist and the abdomen can be exercised.

The training mode is to slow down the falling time of the back plate by prolonging the contraction stroke time of the cylinder shaft, so that the subject has enough back lying countermeasure time and distance. The extension and retraction travel time and length of the cylinder shaft 17 of the cylinder 18 are adjusted, so that the cylinder shaft 17 can be slowly contracted, and the back plate support base 15 fixed in the cylinder groove 14 is driven to slowly return to the flat state together with the back support plate 12, so that the included angle between the back support plate and the bottom plate 9 is reduced from 50 degrees to 0 degrees.

The subject sits on the cushion 2, lies on the back cushion 1, slightly separates two legs, bends the knee to form an angle of about 90 degrees, the feet are flatly placed on the ground, the foot rest 4 is buckled, the ankle joints or the foot faces of the subject are supported, the fixing of the lower limbs is guaranteed, the two fingers are crossly attached to the back of the brain, the upper limbs of the subject are quickly seated by the contraction of the abdominal muscles, simultaneously the elbow joints touch or exceed the knees, the waist and abdomen are forced to press the body backwards when the subject leans backwards, the back support plate 12 slowly falls back due to slow contraction of the cylinder shaft 17 of the cylinder 18, the waist and abdomen are pressed backwards, the back can be completely attached to the back support plate 12, the upward leaning force of the upper limbs and the force of the subject form a butt, and the back support plate 12 slowly falls backwards, so the safety of the leaning backward countermeasures can be guaranteed, and the subject is reciprocated, and the reverse countertraining effect can be realized.

Example 3 Standard sit-up test

In sit-up test, three telescopic rods 21 are fully extended, a foot rest 4 is pulled out of a foot rest accommodating groove 8, a controller 11 is taken out of the controller accommodating groove 5 and fixed on a controller clamp 10, a camera 22 is fixed, an air cylinder 18 is not needed in the mode, so that a back supporting plate 12 is fully accommodated in a back plate groove 20, when in test, buttocks of a tester are positioned on a cushion 2 and lie on a back pad 1, legs are supported on a leg support 3 to enable the included angle between thighs and shanks to be 90 degrees, feet hook the foot rest 4, and when the test is started, the controller 11 can display information such as real-time human motion state, time, number meeting requirements and the like so that the tester can master and know test results and timely adjust the rhythm to finish the test.

The invention adopts the camera to collect the image of the testing process of the tester, utilizes the image recognition technology to detect the corresponding human skeleton point, uses the collected image to compare the distance of the recognition point which is set and marked in advance according to the standard posture, thereby judging the testing action and the non-normative.

Claims (2)

1. The sit-up training test device is characterized in that a back pad (1), a seat cushion (2), a leg support (3), a foot rest accommodating groove (8), a foot rest (4), one or more telescopic rods (21) and a controller accommodating groove (5) are sequentially arranged on the upper surface of a bottom plate (9) of the test device, a back plate groove (20) is formed in the bottom plate (9), the back plate groove (20) corresponds to the back pad (1), a boosting component is arranged in the back plate groove (20), one end of the boosting component is fixed to the bottom surface of the back plate groove (20), the other end of the boosting component is fixed to a back supporting plate (12), the back supporting plate (12) is hinged to the end, positioned in the middle of the bottom plate (9), of the back supporting plate (20), the upper surface of the back supporting plate (12) is provided with the back pad (1), the foot rest (4) is hinged to the body of the bottom plate (9) and can be buckled into the foot rest accommodating groove (8), the upper end part of the telescopic rod (21) is hinged with a controller clip (10), the controller clip (11) is fixed in the controller clip (10), the controller clip (11) is connected to the inner side surface of the telescopic rod (9), and the side surface of the controller clip (11) is connected with the telescopic rod (9) and the side surface of the camera head (9) is fixed to the side surface.

The boosting assembly comprises a cylinder (18), a cylinder tail end hinge (19), a cylinder top end hinge (16) and a back plate supporting base (15), wherein the tail end of the cylinder (18) is fixed on the bottom surface of a back plate groove (20) through the hinged cylinder tail end hinge (19), the top end of a cylinder shaft (17) of the cylinder (18) is fixed on the back plate supporting base (15) through the hinged cylinder top end hinge (16), and the back plate supporting base (15) is fixed on a back supporting plate (12).

2. A method of detecting a sit-up training test apparatus as claimed in claim 1, comprising the steps of:

firstly, identifying images, collecting test videos of a subject within a specified time by using a camera (22), and extracting and identifying key points of human bones of the subject on the images of the test videos, wherein the key points comprise bone points of head, waist, elbow and knee parts; the first rule line L1 is defined from the bone point of the head to the bone point of the waist, and the second rule line L2 is defined from the bone point of the waist to the bone point of the knee;

judging and detecting the motion state of a subject in the test time, measuring the distance d between the skeletal points of the elbow and the skeletal points of the patella, counting if d is less than or equal to 5cm, taking a sit-up action when the included angle alpha between the first rule line L1 and the second rule line L2 is from more than or equal to 120 degrees to less than or equal to 55 degrees, and identifying whether the elbow of the subject touches the knee;

step three, if the test time is longer than the specified time, stopping counting, and ending the test; the controller (11) displays the number of times the subject has completed within a prescribed time.