CN203776905U - Evaluation system for human morphology through two-dimensional camera shooting - Google Patents

Abstract

The utility model relates to a two-dimensional camera body form evaluation system, comprising image acquisition equipment, a vertically placed backboard, a first laser instrument, a second laser instrument and a third laser instrument, the first laser instrument is arranged on the The front of the backboard, the second and third lasers are respectively arranged in front of the backboard near the left and right sides of the backboard, the vertical projection point of the vertical laser of the second and third lasers The connection line is parallel to the plane where the backboard is located, the vertical projection point b of the vertical laser of the first laser instrument to the vertical foot a of the vertical line of the connection line constitutes the center of the measured human body station area, and the image acquisition The vertical projection point of the center of the focal plane of the device lies on said vertical line or its extension. The utility model can directly obtain the two-dimensional dimensions of the height, width and thickness of the human body, and accurately calculate the circumference of the subject through the established model, so as to realize the non-contact measurement in the natural dressing state, and the measurement is simple and fast ,precise.

Description

Two-dimensional camera body shape evaluation system

technical field

The utility model relates to the technical field of two-dimensional non-contact human body measurement, in particular to a system for measuring the shape of a human body through a two-dimensional camera.

Background technique

Anthropometric measurement refers to the determination of the difference in human body size between individuals and groups by measuring the size of various parts of the human body, so as to study the morphological characteristics of human beings, so as to contribute to anthropology, medicine, archaeology, clothing design, engineering design, etc. The research provides basic data, and is also the basic work of physical fitness research and competitive sports science selection. Only by accurately grasping the specific data of relevant parts of the human body through scientific and convenient means can the success of scientific research be guaranteed.

Contact anthropometric measurement is the use of special measuring instruments for contact measurement of the human body. In the process of obtaining data, a lot of manpower and material resources are needed, the working hours are long, the workload is heavy, and the accuracy depends on the technical level and work attitude of the personnel who perform the measurement.

Non-contact anthropometric measurement generally uses measurement methods such as stereo photography, laser, Moiré stripes, TC2 layered contour, projected fringe phase, etc. With the rapid progress of computer technology and the continuous maturity of signal automatic processing technology in recent years, it has developed rapidly, relying on Its fast, simple and other advantages have become the new favorite of many scholars and engineers at home and abroad, and have achieved gratifying results. In particular, the three-dimensional non-contact measurement has high accuracy, but its cost is high and the instrument is heavy, which is not conducive to the use in the selection of competitive sports materials that require frequent changes in field conditions, and its use conditions are exquisite and it is not convenient for large-scale and multi-person testing. In addition, the need to take off clothes to obtain data in a dark room will also embarrass young students in the developmental period.

Contents of the invention

In order to overcome the above-mentioned defects in the prior art, the purpose of this utility model is to provide a two-dimensional camera human body shape evaluation system, which uses photogrammetry technology to directly obtain the two-dimensional dimensions of the human body's height, width, and thickness, and through the established The model accurately calculates the circumference size of the subject, realizes the non-contact measurement in the natural dressing state, and the measurement is simple, fast and accurate.

The technical scheme of the utility model is:

A two-dimensional camera human form evaluation system, including image acquisition equipment, and also includes a vertically placed backboard, a first laser instrument, a second laser instrument and a third laser instrument, the first laser instrument is arranged on the backplane In front of the board, the second and third laser devices are respectively arranged in front of the back board near the left and right sides of the back board, and the line connecting the vertical projection points of the vertical laser of the second and third laser devices Parallel to the plane where the backboard is located, the vertical projection point b of the vertical laser of the first laser instrument to the vertical foot a of the vertical line of the connecting line constitutes the center of the measured human body station area, and the image acquisition device The vertical projection point of the center of the focal plane lies on the vertical line or its extension.

The focal plane of the image capture device is preferably parallel to the plane where the backplane is located.

Grid marks can be set on the back plate.

Preferably, said perpendicular is coplanar with the longitudinal centerline of said back panel.

The image acquisition device can be a digital camera, a digital camera or a digital video recorder.

The image acquisition device is communicatively connected with a computer. Specifically, it can be connected to the computer through a USB cable, and the computer can be a type of equipment with functions such as numerical calculation, data processing, and picture display.

The vertical projection point of the focal plane center of the image acquisition device preferably coincides with the vertical projection point b, and may also be located on the extension line of the vertical line in front of the vertical projection point b.

A flashlight may also be provided on the left and/or right side of the image acquisition device, and the flashlight may be wired or wirelessly connected to the image acquisition device.

For any one of the aforementioned two-dimensional camera human form evaluation systems, it may also include a shooting frame for the measured human body to stand on, and the vertical projection point of the center of the shooting frame is preferably in line with the vertical foot a coincide.

The two-dimensional camera human body shape evaluation system can also be provided with a height gauge column, the height gauge column is parallel to the plane where the backboard is located, and the height gauge column takes the height of the plane on the shooting frame as the starting height for measurement .

The beneficial effects of the utility model are: the utility model can directly obtain the accurate two-dimensional dimensions of the height, width and thickness of the human body by taking pictures of the front and side images of the human body, and then use the established mathematical model to quickly and accurately Calculate the circumference size of the measured human body, so as to realize anthropometric measurement and further human body shape evaluation, and the measurement process is simple and easy. The system is simple in structure, light in weight, easy to implement, low in cost, and can be flexibly placed in different test environments, and the subjects can be measured while wearing swimsuits to avoid embarrassment.

Description of drawings

Fig. 1 is a top view structural representation of an embodiment of the utility model;

Fig. 2 is a front view structural schematic diagram of Fig. 1;

FIG. 3 is a right view structural diagram of the back panel part in FIG. 2 .

Detailed ways

The utility model provides a two-dimensional video camera human form evaluation system, referring to Figures 1 and 2, which includes an image acquisition device 1, a vertically placed backboard 2, a first laser instrument 3, a second laser instrument 4 and a second laser instrument 4. Three lasers 5, the first laser is arranged in front of the backboard, the second and third lasers are respectively arranged in front of the backboard near the left and right sides of the backboard, the second , The line connecting the vertical projection point of the vertical laser of the third laser is parallel to the plane where the backplane is located, the vertical projection point b of the vertical laser of the first laser to the vertical foot a of the vertical line of the connection Constituting the center of the measured human body position area, the vertical projection point of the focal plane center of the image acquisition device is located on the vertical line or its extension line. The vertical projection point of the focal plane center of the image acquisition device preferably coincides with the vertical projection point b, and may also be located on the extension line of the vertical line in front of the vertical projection point b. In another direction, the focal plane of the image capture device is preferably parallel to the plane where the back plate is located. The image acquisition device is used to collect two-dimensional images of the measured human body, and the laser instrument is used to locate the measured human body. During the test, the subject stands in front of the backboard with the backboard as the background and changes a variety of standing directions. For each standing direction, with the vertical laser of the laser instrument set on three different positions as a reference, the subject The tester's standing position and posture are adjusted to the test requirements, and the two-dimensional photos of the tested human body in different directions are obtained through the image acquisition device, and the two-dimensional dimensions of the measured human body's height, width and thickness can be calculated according to the corresponding proportions , and serve as the basic data for the calculation of the circumference of the measured human body and further body shape discrimination.

A grid mark 21 can be set on the back plate as a scale calibration reference line for measuring two-dimensional dimensions of human body height, width and thickness (such as shoulder width, chest thickness, hand length, etc.). The first laser and the image acquisition device are preferably located directly in front of the backboard, and at this time, the vertical line is coplanar with the longitudinal centerline of the backboard.

The image acquisition device may be a digital camera, a digital video camera, or a digital video recorder. The image acquisition device is connected to a computer through communication, specifically through a USB cable, and the photographs taken by the image acquisition device can be transmitted to the computer. The computer can be a type of electronic computer with functions such as numerical calculation, data processing, and picture display. The equipment, which can be installed with the application software of the human body shape evaluation system that can realize automatic calculation. After the application software reads the photos of the tested human body from different angles, it only needs simple intervention by the operator, including filling in the basic information of the subject, scaling and marking the test points, and the height and width of the measured human body can be automatically measured. and the calculation of the two-dimensional size of the thickness and the calculation of the circumference size of the measured human body based on the two-dimensional size data, and further deduce the body shape of the subject through the built-in body shape discrimination formula in the application software of the human body shape evaluation system category.

A flashlight may also be provided on the left and/or right side of the image acquisition device, and the flashlight may be wired or wirelessly connected to the image acquisition device. The position of the flashlight is subject to the fact that the lens of the image acquisition device is not blocked and the brightness of the captured image is appropriate.

For any one of the aforementioned two-dimensional video camera human form evaluation systems, it can also include a shooting frame 6 for the measured human body to stand on, and the vertical projection point of the center of the shooting frame is preferably in line with the vertical foot. a coincidence. The shooting stand is preferably a stand with a flat upper surface and a regular shape. Before use, it is best to use a level to adjust the upper surface of the shooting frame to an absolute horizontal position. The lower edge of the backboard should not be lower than the upper surface of the camera frame, so that the projection of the measured human body on the plane where the backboard is located is all located in the backboard, and the position can be marked by grid marks.

The two-dimensional camera body shape evaluation system can also be provided with a height meter column 7, the height meter column is parallel to the plane where the backboard is located, and there is a certain distance between the backboard and the backboard, and can be located between the backboard and the camera Between the frames, it can also be located at the rear of the frame. The height of the stature column is measured with the plane height on the shooting frame as the starting height.

The vertical projection point of the center of the focal plane of the image acquisition device preferably coincides with the vertical projection point b. When placed specifically, the image acquisition device can be installed on a tripod 8, and the first laser can be placed on the Below the tripod. The distance between the vertical projection point b and the vertical foot a is preferably 4m, the distance from the midpoint of the lens of the image acquisition device to the ground is preferably 90cm, and the distance from the lower edge of the backboard to the ground is preferably 10cm. Once the above distance is determined, it should not be changed for the same batch of measurement process.

Below is a more specific example to describe in detail the composition of the utility model and how to install and use the utility model for evaluation.

(1) Required related instruments and equipment:

Photo collection equipment: 2 Nikon D80 digital cameras (35mm, f/1.8G), Nikon Camera Control Pro 2.5 camera control software, 1 dell laptop computer for testing, 2 external photography flashlights;

Calibration equipment: 3 horizontal laser instruments for calibration (including charger and AA battery), 3 rulers (2 tape measures 5m, 1 tape measure 1.5m), 3 heavy hammers, 1 bundle of wires, and 1 shooting frame Cover, 1 lattice back panel;

Leveling equipment: level 3;

Auxiliary equipment: 1 camera USB cable, camera charging device (1 charger, 2 batteries), 1 camera power adapter, 1 camera-tripod connection buckle (included with the tripod), 3 tripods (flash tripod 2, 1 camera tripod), 1 flash-camera wireless connector (included with the flash system), 2 four-hole sockets, 900 Mark point stickers, 4 blackout curtains, 2 pairs of light-blocking glasses, swimsuits for men and women several pieces each;

Analytical equipment: an all-in-one computer with Coreldraw 12.0 photo measurement software installed in it.

(2) Preparation for shooting:

A. Calibration preparation

1) The backboard is hung against the wall, 10cm above the ground, the lower edge of the backboard is parallel to the horizontal ground, and all parts of the backboard are kept on the same plane.

2) Use a tape measure to measure the distance from the midpoint of the rear edge of the camera frame to the projection point of the center of gravity of the camera frame, use a tape measure to measure the position at the same distance from the center of the lower edge of the backboard perpendicular to the backboard, and determine the mark point a on the ground.

3) Place the horizontal laser on the ground corresponding to the middle of the lower edge of the backboard, turn on the vertical laser, turn the laser level, make the ground laser pass through the mark point a, make the center line of the tape measure coincide with the ground laser, and determine the distance from the mark point a 4m , determine the marker point b on the ground.

4) Place the laser level at the mark point b, turn on the vertical laser, turn the level so that the beam coincides with the longitudinal line in the center of the back panel, place the shooting frame so that the ground laser passes through the projection point of the center of gravity of the shooting frame, and coincides with the center line of the shooting frame. A small spirit level adjusts the shooting frame to make it level.

5) Install the camera on a tripod, connect the flash light with the camera, and synchronize the two, place a small level on the camera, adjust the camera to level, and adjust the height of the tripod so that the midpoint of the lens is 90cm from the ground. Place the weight directly below the focal plane of the camera, and adjust the position of the tripod so that the lower part of the weight corresponds to point b.

6) Use a tape measure and a laser level to determine the marking points a1 (near the camera frame), b1; a2 (near the camera frame), b2 on both sides of the lower edge of the backboard by steps 2) and 3) respectively.

7) Place the two horizontal lasers at points b1 and b2 respectively, turn on the vertical laser, and rotate the camera along the vertical axis so that the focal plane of the camera coincides with the left and right lasers, so that the longitudinal axis of the camera and the longitudinal axis of the shooting frame are on the same horizontal plane, and the horizontal plane of the camera maintain standard.

B. Preparation for shooting

1) Place the flash on both sides of the camera with a tripod, subject to not blocking the camera lens and the brightness of the photo is appropriate, the flash setting: full/power on/model off.

2) Adjust the camera settings to M mode (manual mode), and the camera USB connection to USB-MTP mode to facilitate the connection between the camera and the control software.

3) Connect the camera to the computer, open the Nikon Camera Control Pro 2.5 camera control software, and set the camera to: shutter v: 125; aperture: f/9; exposure compensation: -5; flash compensation: +1; flexibility: 0 .

4) Place the three horizontal lasers at b, a1, and a2 respectively, and turn on the vertical lasers, so that all the lasers pass through the projection point of the center of gravity of the shooting frame.

C. Auxiliary preparation

1) Confirm the position of the camera again, adjust the focal length of the camera until the image covers the entire back panel, and close the blackout curtain.

2) Dress requirements for the subjects: the tested male subjects wore tight-fitting dark swimming trunks, and the tested female subjects wore tight-fitting split-style dark swimsuits. When shooting, I took off the relevant accessories and accessories, and the long hair was tied up, revealing the full neck.

3) Check whether the subject’s Mark points are missing. If there is a subsidy according to the detailed rules of the test indicators, the subject wears light-shielding glasses and waits for the experiment at the designated location.

4) Subjects stand on the shooting frame in order: frontal photo: the torso stands in the height measurement posture (shoes, socks and caps should be taken off before the measurement, and the back is leaned against the stature column, and the heel, buttocks and the midpoint of both shoulders are in contact with the column , take an upright posture, look straight at the Frankfurt plane with both eyes, heels close together, toes separated by about 45°), upper limbs abducted 45°, palms facing inward, the frontal laser passes the tip of the nose, and the left and right lasers coincide with the left and right midaxillary lines respectively. Side view: the torso stands in a height-measured posture, the right side of the body faces the camera, and is perpendicular to the backplane, the right upper limb is abducted 45°, the frontal ray passes through the earlobe point, the laser on the left coincides with the spine, and the laser on the right passes through the tip of the nose. Rear view: the posture is the same as that of the frontal view, facing the back panel, the frontal laser beam coincides with the spine, and the left and right laser beams coincide with the left and right midaxillary lines respectively. Take pictures with the above three poses.

The inventor of the present application determines the relevant circumference mathematical model through multi-factor analysis and the method of establishing a mathematical model, and uses the cluster analysis method to formulate a new classification method of juvenile body type for the main test index, derived index and comprehensive index, and puts all the The modules corresponding to the above mathematical models and classification methods are built into the application software of the human body form evaluation system. By using the utility model for non-contact anthropometric measurement, taking pictures of the front and side images of the subject, directly obtaining the two-dimensional dimensions of the height, width, and thickness of the human body, and then calculating the corresponding circumference of the subject by using the application software of the human body shape evaluation system size. In this way, the physical fitness monitoring of young students and the selection of competitive sports talents can be easily, quickly and accurately completed, so as to save a lot of manpower and material resources for the realization of the national fitness program and the Olympic research program. The utility model is particularly suitable for body shape detection and evaluation of young students whose body shape changes greatly.

Claims (10)

1. A two-dimensional camera body shape evaluation system, comprising image acquisition equipment, is characterized in that it also includes a vertically placed backboard, a first laser instrument, a second laser instrument and a third laser instrument, the first laser instrument It is arranged in front of the backboard, the second and third lasers are respectively arranged in front of the backboard near the left and right sides of the backboard, and the vertical laser of the second and third lasers is The connection line of the projection point is parallel to the plane where the backboard is located, and the vertical projection point b of the vertical laser of the first laser instrument to the vertical foot a of the vertical line of the connection line constitutes the center of the measured human body station area, so The vertical projection point of the center of the focal plane of the image acquisition device is located on the vertical line or its extension line. 2. The two-dimensional video camera body form evaluation system according to claim 1, characterized in that the focal plane of the image acquisition device is parallel to the plane where the backboard is located. 3. The two-dimensional camera-based body form evaluation system according to claim 2, wherein grid marks are arranged on the back plate. 4. The two-dimensional camera-based body form evaluation system according to claim 3, wherein the vertical line is coplanar with the longitudinal centerline of the backboard. 5. The two-dimensional video camera human form evaluation system according to claim 4, wherein the image acquisition device is a digital camera, a digital camera or a digital video recorder. 6. The two-dimensional video camera body form evaluation system according to claim 5, characterized in that said image acquisition device is connected to a computer by communication. 7. The two-dimensional video camera human form evaluation system according to claim 6, wherein the vertical projection point of the focal plane center of the image acquisition device coincides with the vertical projection point b, or is located at the vertical projection point b. On the extension line of the vertical line in front of the projected point b. 8. The two-dimensional video camera human form evaluation system according to claim 7, wherein a flashlight is also provided on the left side and/or right side of the image acquisition device, and the flashlight and the image acquisition device are wired or Wireless connections. 9. As claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8 described two-dimensional video camera human form evaluation system, it is characterized in that also comprising a photographing frame for the measured human body to stand on it, so The vertical projection point of the center of the shooting frame coincides with the vertical foot a. 10. The two-dimensional camera human form evaluation system as claimed in claim 9, characterized in that it is also provided with a height gauge column, the height gauge column is parallel to the plane where the backboard is located, and the height gauge column is taken by the camera. The plane height on the shelf is the starting height of measurement.