SI22424A - Device and procedure for threedimensional measurement of body shape - Google Patents

Abstract

The subject of invention is a device and procedure for threedimensional measurement of body shape, particularly foot shape for the purpose of producing a last and consequently a comfort boot, preferentially a ski boot, fitting as much as possible to the user's foot. The device for threedimensional measurement of body shape, particularly foot shape according to the invention, makes use of foot measurement based on circular revolution and rotation of a laser triangulation meter composed of at least one or two cameras (7, 8) and a laser line projector (9), a basic and walkable board (11) and a mechanism to assure circular motion and rotation of the measuring module.

Description

APPARATUS AND PROCEDURE FOR THREE DIMENSIONAL MEASUREMENT

BODY SHAPES

The object of the invention is a device and a method for measuring three-dimensional body shape, in particular the shape of the feet, for the purpose of making the shoe as comfortable as possible and, consequently, a comfortable shoe, preferably a ski boot, the user's feet. The invention belongs to class G 01 B 11/24 of the international patent classification.

A technical problem that the present invention successfully solves is the design solution of such a device, which will primarily allow simultaneous measurement of both feet in the normal and correct relaxed position, accurate measurement in the toe and heel areas and simple and cheap implementation.

Several types of irregularly shaped body shape measuring devices are known. Thus, e.g. from patent document EP 0 422 946 known device for measuring bodies with irregular shapes, including hooves. The device measures the surface of the hoof point by point by circling around the hoof and moving along its principal axis at the same time. The measuring module of the device consists of two line CCD cameras that are symmetrically arranged with respect to a point laser projector. The document shows that the device is designed primarily for hoofing, individually. The measurement process is time consuming and as such is not suitable for measuring a living, time-varying body such as the foot.

The solution described in EP 0 671 679 patent is very similar in principle to the operation and purpose of the device described above, except that in addition to rotation and translational motion, the measuring module can be rotated along two measuring axes.

Patent Document PCT / US97 / 00985 (WO97 / 27451) describes an apparatus substantially identical to the former, except that it can be used to measure the shape of the foot. The axis of the circle of the measuring module should approximately coincide with the longitudinal axis of the foot (heel center). The surface of each io foot individually measures point by point.

The device according to patent document PCT / EP97 / 05850 (WO98 / 18386) is used to measure the shape of the feet. The device measures only one foot at a time, which needs to be inserted into the hole of the walkway. The measuring module, which is located under the hiking platform, measures the foot in a 360 ° circular motion. The measuring module operates on the basis of laser triangulation with linear illumination of the foot surface. It consists of a video camera and a laser plane light projector. Thus, a certain cross-section of the foot is measured in an instant. The entire surface of the foot is reconstructed based on a series of measured profiles. The device is impractical, especially in view of the need to insert the foot into the hole of the platform, further because of the necessary crossing. Another disadvantage is the unnatural posture of the foot during the measurement, since the second foot is significantly higher.

The device according to the patent document US 2004/0184040 operates according to the photogrammetric principle. The measured person steps on a hiking board with photogrammetric identification markings to help orient the measuring module, consisting of the camera and the illumination lights, in the space so that the camera captures the said markings in addition to the leg image. During the measurement, the leg, or any measured body, must be covered with a special elastic coating, on which photogrammetric identification marks are also drawn. The measurement is carried out in such a way that the measuring module performs a 360 ° circular motion around the leg. The disadvantage of this innovation is also evident in the fact that special socks need to be worn before measurement, which is time consuming, uneconomical, inaccurate (due to the increased size) and unhygienic. Another disadvantage arises from the measurement principle itself and the associated recognition of photogrammetric patterns. This technique is known to be processor-intensive and sensitive to potential interference, such as leg movement or inadequate illumination of measuring rooms.

According to the embodiments described, none of them solves a satisfactory technical problem.

The device for the three-dimensional measurement of body shape, in particular the 2o foot shape according to the invention, utilizes the principle of foot measurement based on a circular circumference and rotation of a laser triangulation meter consisting of two cameras and a laser projector, a basic and walking surface and a mechanism for providing circular and rotational motion of the measuring module .

The device for three-dimensional measurement of body shape, especially the shape of the feet according to the invention will be explained in more detail on the basis of an embodiment and the accompanying figures, of which it shows:

Figure 1 a device for measuring body shape according to the invention in axonometric view; Figure 2 a device for measuring body shape according to the invention in lateral view;

Fig. 3a, b, c, d The sequence of motions measured in the shape measurement process

bodies with the device according to the invention; Figure 4 schematic representation of shadow when measuring; Figure 5 schematic illustration of laser measuring operation module with one camera and laser line 15 projectors; Figure 6 schematic illustration of laser measuring operation module with two cameras and laser line

projectors;

Fig. 7a is a block diagram of a device for measuring body shape according to the invention;

7b is a block diagram of a measuring module of a device for measuring body shape according to the invention.

The device for three-dimensional measurement of body shape, in particular the shape of the feet according to the invention, operates according to the basic principle of foot measurement based on the circular circumference and rotation of the laser triangulation meter. The structural design of the device according to the invention is shown in Figures 1 and 2, and the block diagram of the device itself and the measuring module is shown in Figures 7a, 7b, while its operation will be explained with the help of Figures 3a, b, c, d.

The procedure for measuring the shape of the body, in particular the shape of the feet according to the invention, in the sequence of movements in the case of clockwise measurement in individual stages, is as follows:

io Start of rotation of the second axis B (Figure 3a). When the measuring module 1 rotates to an angle when the light plane intersects the first rotary axis A, it stops. Then, the circular motion of the measurement module 1 starts around the first axis A (Figure 3b). The circular motion around the first axis A is completed and the rotation of the measurement module 1 around the second axis B begins (Figure 3c). The rotation around the second axis B is completed (Figure 3d).

The second axis B of the rotation is added because of the shadow and the associated measurement coverage in the area of the inner side of the foot when there is an adjacent leg between the measurement module 1 and said surface (Figure 4). Furthermore, coverage was improved by using two 7.8 symmetrically positioned cameras relative to the laser plane (Figure 6).

The measurement module 1, based on the principle of laser triangulation with linear illumination of the surface, consists of a laser linear projector 9 and at least one camera 7. The laser linear projector 9 illuminates the measured body with a light surface. The intersection between the surface and the surface of the gauge is called the intersection curve. The illuminated surface is captured by an optical sensor - a camera - from another angle. At the locations of the intersecting curves, light is scattered and the part is imaged through the lens of camera 7 onto the sensor surface of the camera. The displacement of the measured surface causes a relative change in the position of the cross-sectional curve of the sensor. From the figure, we determine the image coordinates of the cross-section curve, from which, based on the camera data 7, the laser line projector 9, and their positions with each other, we calculate the 3D coordinates of the points on the surface of the meter. Figure 5 shows the operating principle of a single camera 7 laser measuring module.

When measuring complex (read: vibrant) surfaces, it is reasonable to use a dual-camera measurement module configuration. The coverage of the measured area is thus improved (Figure 6).

Figure 7a shows a block diagram of a device for measuring three-dimensional body shape according to the invention. The apparatus consists of mechanical assemblies such as the measuring module 1, the rotating mechanism 2.2 'to move the measuring module 1, the power supply 3, the computer 4, the monitor 5 and the keyboard 6. The measuring module 1 consists of cameras 7.8 and a laser line projector 9.

The measuring module 1 is connected to the computer 4 and a rotary mechanism 2, 2 'to move the measuring module 1 via the RS232 interface 10 through the 2o RS232. On the other hand, the computer 4 is connected to the monitor 5 and the keyboard 6.

The device measures the three-dimensional shape of the feet by measuring the person with both feet on the hiking board 11. The operator, or the measured person himself, initiates the measurement by pressing a computer keyboard

6, or in another computer-recognizable way (voice, special key, touch screen, etc.). The computer 4 sends, via RS232 interface 10, a signal to the control electronics of the 2.2 'rotation mechanism to initiate movement as shown in Figures 3 a, b, c and d. The control electronics of the rotary mechanism 2,2 'send signals via the RS232 interface to the computer when the actual phase of motion is actually started or completed, io Computer 4 captures the camera image only during steady motion or rotation of the measuring module, ie in time periods, delimited by said control electronics signals. After completing all three movements, the processing of the captured data is carried out, the result of which in the first phase is a cloud of three-dimensional points that survey the surface of both feet. In the following, the analysis of the mentioned points is performed by computer in order to determine the characteristic dimensions, such as length, height, width and circumferences on the individual cross section of each foot. The results of said analysis are graphically displayed on monitor 5, printed on paper and stored in a database. This completes the measurement. In the case of foot measurements in stores, the computer algorithm can continue to choose the shoe that fits best with the customer's foot.

With the stated sequence of motion of the measuring module and the shown construction of the device according to the invention, the following advantages are achieved over existing types of meters:

- the toe and heel area is very well measured because the measurement direction is approximately perpendicular to the heel or toe surface,

- both feet are measured simultaneously, which makes it unnecessary for a person to cross and, most importantly, both feet are in a correct, relaxed position, as well as a shorter measurement time;

- Easy and inexpensive implementation.

Claims (5)

PATENT APPLICATIONS 1. A device for the three-dimensional measurement of body shape, characterized in that: 5 that it consists of a measuring module (1), a rotary mechanism (2,2 ') for moving the measuring module (1), a power supply (3), a computer (4), a monitor (5) and a keyboard (6). A three-dimensional body shape measuring device according to claim 1 io, characterized in that the measuring module (1) consists of at least one camera (7) and a laser line projector (9). A device for the three-dimensional measurement of body shape according to claim 1 15, characterized in that the measuring module (1) consists of cameras (7, 8) and a laser line projector (9). 4. Procedure for three-dimensional measurement of body shape, 20, characterized in that the measurement starts with the rotation of the second axis (B), with the beginning of the measuring module (1) rotated about 45 ° relative to the direction towards the first rotary axis (A) and when the measuring module (1) is rotated to the angle when the light plane intersects the first rotary axis (A), it stops, then begins the circular motion of the measuring module (1) around the first axis (A) and when the rotation of the measuring module (1) ends around the second of the rotary axis (B), which is then terminated at the rotation of the measuring module 5 (1) by about 45 ° relative to the direction of the first rotary axis (A).