WO2017150745A1 - Apparatus and method for measuring surface curvature of subject - Google Patents

Abstract

The present invention relates to an apparatus for measuring the surface curvature of a subject, wherein an image of the outer surface of a subject, in which moiré contours are clearly marked according to the degree of the surface curvature, can be obtained by projecting moiré contours on the surface of the subject through a filter having a pattern and photographing the subject through the filter, and particularly a clearer image of the outer surface of a subject can be obtained by photographing the subject while moving a filter having a pattern within an angle of view of a camera, in which the subject is included, during the photographing, so as to remove patterns by the pattern of the filter. The apparatus is characterized by photographing a subject on which moiré contours are projected via a filter having a pattern, and moving the filter during the photographing.

Description

Apparatus and method for measuring surface curvature of a subject

The present invention relates to an apparatus and a method for measuring surface curvature of a subject, wherein the moiré contour is clearly displayed according to the degree of surface curvature by projecting the moire contour onto the surface of the subject through a patterned filter and photographing the subject through the filter. It is possible to obtain an image of the outer surface of the subject, and in particular, by photographing while moving a filter in which the pattern is formed in the angle of view of the camera including the subject, a clearer image of the outer surface of the subject can be obtained by removing the pattern pattern caused by the pattern of the filter. The present invention relates to an apparatus and method for measuring surface curvature of a subject.

There are two methods of measuring three-dimensional bends using moire patterns: shadow moire and projection moire. Shadow moire is a method of measuring the shape of a subject by using a moire pattern generated from a shadow of a lattice pattern appearing on the surface of a subject without using a lens. Projection moire is a white light on a subject. Or a lattice pattern is obtained by scanning a grid pattern using a monochromatic light projector and superimposing a grid image transformed according to the shape of an object on a reference grid having the same pitch as the scanned grid.

1 is a schematic diagram of a method of measuring a shadow moire system according to the prior art.

Referring to FIG. 1, when the illumination unit 2 illuminates the light, the contour pattern is displayed on the measurement target object S through the grid 1, and the image of the subject having the contour pattern is photographed by the camera 3. You get

Such a three-dimensional bending measurement method using a shadow moire has a simple advantage, but the drawback is applicable only when the grid and the subject can be brought into close proximity because the shadow of the grid must be used. There is a drawback that it is difficult to visually check the minute bending change because the moire pattern is not clear, which places a lot of restrictions on actual use.

In order to improve such a deficiency of the prior art, the present inventors photographed a subject through a filter means in which a pattern was formed, and thus the present inventors obtained a surface curvature measuring apparatus capable of acquiring an outer surface image of a subject in which a contour line according to the degree of surface curvature was clearly displayed. Patent Publication No. 2014-0128698 has been proposed.

Referring to FIG. 2, the filter means 10, the lighting means 20 and the photographing means 30 may be mounted in the installation means 50 in which external illumination is blocked, and at one side (filter) in the installation means 50. The means side) forms a constant opening O so that the subject can be positioned. On the other side (the photographing means side) of this mounting means 50, a camera fixing part capable of fixing the photographing means 30 is provided.

Such a surface curvature measuring device has an advantage that it is possible to obtain an image of the outer surface of the subject in a state where the contour lines according to the degree of surface curvature are clearly displayed, so that the surface curvature of the subject can be easily visually checked, but is formed in the filter means 10. There is a problem that the pattern of the pattern itself is included in the external image of the subject when shooting.

Such a pattern pattern has a primary problem of causing a deterioration in visual quality of the subject's outer image, reducing discrimination and distracting the concentration on the moire pattern.

In addition, since the pattern pattern is included in the external image of the subject, it may be confused with a moire pattern having information on the surface curvature of the subject in the external image of the subject. In an automated analysis of surface curvature changes, which compute the depth information of each part of the face through information such as the thickness of the contour lines of the moire pattern on the face and the spacing between the contour lines, such pattern patterns cause analysis errors. It is a major cause of it.

The present invention has been made to solve the above problems, the object of which is to project the moire contour on the surface of the subject through a filter with a pattern formed, and the contour by the photographing the subject through this filter clearly the contour according to the degree of surface curvature The external image of the subject in the displayed state can be acquired, and in particular, by photographing while moving the filter in which the pattern is formed in the angle of view of the camera including the subject, a clear pattern of the external image of the subject is obtained by removing the pattern pattern caused by the pattern of the filter. The present invention provides an apparatus and method for measuring surface curvature of a subject.

According to the present invention, there is provided a surface curvature measuring device, characterized in that for photographing a subject via a filter having a pattern formed thereon and moving the filter during photographing.

Preferably, the pattern is made of a plurality of horizontal lines, the filter is characterized in that the lifting or lowering during shooting in conjunction with the lifting unit.

Preferably, the pattern is composed of a plurality of vertical lines, the filter is characterized in that moving in the left or right direction when shooting in conjunction with the lifting and lowering unit.

Preferably, the moving speed of the filter is smaller than the exposure speed of the photographing camera.

Preferably, the movement of the filter is characterized by satisfying the following equation. <Equation> T _s where _f ≤t T _f is the travel time from the line l _n on the basis of a specific point of the movement process of the filter to a line l _{n +1} is in the (n = 1, ... m) , T _s is the exposure time of the camera photographing the filter.

Preferably, the housing is formed with an opening in which the subject is located in front; An illumination unit positioned inside the housing and emitting light; A filter unit disposed between the lighting unit and the subject and formed of a filter having a stripe pattern formed thereon; A photographing unit positioned on an opposite side of the subject based on the filter unit and photographing the subject through the filter unit; And an elevating unit configured to elevate or lower the filter unit. Characterized in that it comprises a.

Preferably, the filter, a transparent substrate; And a stripe pattern formed on the substrate. Characterized in that it comprises a.

Preferably, the substrate is characterized in that formed of glass or plastic.

Preferably, the pattern is characterized in that it is formed of a plurality of vertical lines or a plurality of horizontal lines on the subject side surface of the substrate.

Preferably, the thickness of the string constituting the pattern is characterized in that 0.3 mm to 1 mm, the spacing between the lines is 0.3 mm to 1 mm.

Preferably, the lighting unit, the photographing unit and the elevating unit is controlled by the control and display means, the image captured by the photographing unit is characterized in that displayed through the control and display means.

Preferably, the opening portion is characterized in that the posture maintaining portion for fixing the posture of the subject is provided.

Preferably, the posture maintaining part is characterized by consisting of a face guide for positioning the face face, a forehead guide for positioning the forehead and a jaw guide for positioning the chin.

Preferably, the face guide is composed of a frame forming a square and both side vertical frame is configured to face both sides of the face as a face contact portion, the center portion of the upper frame and the lower frame rotatable dial coupling portion respectively It is characterized by being combined.

Preferably, the forehead guide is characterized in that the forehead contact portion having at least one protrusion is fixed to the dial coupling portion and the other end protruding in the direction of the face guide.

Preferably, the jaw guide is characterized in that the one side is fixed to the dial coupling portion and the other end is provided with a jaw contact portion having at least one protrusion protruding in the direction of the forehead guide.

Preferably, the lifting slot of the filter is formed on the upper surface of the housing according to the upward movement of the filter is formed.

Preferably, the lighting unit is fixed to the side position of the inner surface of the housing.

On the other hand, according to another aspect of the present invention, (a) positioning the subject to be measured on one side of the filter pattern is formed; (b) projecting moire contours on the subject by radiating light toward the subject from the other side of the filter; (c) moving the filter by raising or lowering the filter; (d) photographing a subject in which moire contours are projected through the moving filter; And (e) displaying an image of the photographed subject; Characterized in that it comprises a.

Preferably, the pattern is composed of a plurality of horizontal lines, in the step (c) is characterized in that the filter is raised or lowered.

Preferably, the pattern is composed of a plurality of vertical lines, in the step (c) is characterized in that the filter moves in the left or right direction.

Preferably, in the step (c), the movement time of the filter is shorter than the exposure time of the photographing camera.

Preferably, the movement of the filter is characterized by satisfying the following equation. <Equation> T _s where _f ≤t T _f is the travel time from the line l _n on the basis of a specific point of the movement process of the filter to a line l _{n +1} is in the (n = 1, ... m) , T _s is the exposure time of the camera photographing the filter.

Preferably, in the step (a), the subject to be measured is fixed by the posture maintaining unit.

Preferably, the filter is characterized in that to form a pattern formed of a plurality of vertical lines or a plurality of horizontal lines on the subject side surface of the substrate on a transparent material substrate.

According to the present invention, by projecting moire contours on the surface of the subject through the filter means having a pattern formed and photographing the subject through the filter means, it is possible to obtain an image of the outer surface of the subject with the contour lines clearly displayed according to the degree of surface curvature. There is an effect that it is possible to easily check the surface curvature of the subject.

In addition, by photographing while moving the filter having a pattern formed in the angle of view of the camera including the subject when shooting, it is possible to remove the pattern pattern by the filter pattern to obtain a clearer outer surface image of the subject.

1 is a schematic diagram of a method for measuring the bending of the shadow moiré method according to the prior art.

2 is a view for explaining a surface bending measurement apparatus according to the prior art.

3 is a perspective view for explaining an apparatus for measuring surface curvature of a subject according to an exemplary embodiment of the present invention.

Figure 4 is a perspective view for explaining the posture maintenance unit according to an embodiment of the present invention.

5 is a view showing a state in which the housing is removed from the surface bending measurement apparatus of the subject according to an embodiment of the present invention.

6 is a view for explaining an example of a filter according to the present invention;

7 is a view for explaining and comparing the resultant image of the existing device with the resultant image according to the present invention.

8 is a view for explaining the lifting motion of the filter according to the present invention.

9 is a flowchart illustrating a method for measuring surface curvature of a subject according to the present invention.

10 is a flowchart for explaining a method for analyzing surface bending changes in accordance with the present invention.

Hereinafter, an apparatus and method for measuring surface curvature of a subject according to the present invention will be described in detail with reference to the accompanying drawings.

The apparatus and method for measuring the surface curvature of the subject according to the present invention projects the moire contour on the surface of the subject through a patterned filter and photographs the subject through the filter, so that the contour of the subject according to the degree of surface curvature is clearly displayed. Images can be obtained, and the surface curvature of the subject can be easily visually checked to provide a clear visual indication of the change in the subject's curvature.

For example, in a medical environment such as dermatology, plastic surgery, orthopedic surgery, the patient's body shaping or orthopedic treatment results or skin care results may be exerted in explaining to the patient as compared to before the procedure. In particular, the human face has a variety of bends such as the forehead, temples, brows, nose roots, nose, furrows, foreheads, side clowns, various wrinkles, jawline, chin, and cheeks. Conventional methods of visually convincing are difficult to gain trust from patients because they are made through a doctor's explanation using facial pictures before and after the procedure. However, since the apparatus and method for measuring the surface curvature of the subject according to the present invention can obtain an image in which the contour is displayed according to the height of the face, the contour change before and after the procedure can be visually confirmed to the medical staff and the patient, so that the patient himself or herself face Changes can be identified objectively, which will soon ensure patient confidence in the staff and will allow the staff to easily explain the outcome of the procedure through objective data. That is, the depth information of each part of the face can be calculated through the information such as the thickness of the contour line of the moire pattern and the interval between the contour lines displayed on the face, so that the medical staff can obtain accurate numerical flexion information of the face. The patient will be able to explain the results of the procedure reliably.

In addition, this principle will be used for various applications and great utility in the entire industry, such as bending and defect checking of various industrial parts including the chassis of automobiles, and checking and bending of various advanced parts including semiconductor chips. This can be easily understood.

In particular, the present invention by removing the pattern pattern due to the pattern of the filter by removing the pattern pattern by moving the filter in which the pattern is formed in the angle of view of the camera including the subject when shooting the image in the surface curvature measuring apparatus of the subject more clear image of the subject Can be obtained.

This is a structural feature of the surface curvature measuring device of the subject of the present invention is an image capture method via a filter. The biggest problem to be solved in the image capturing method through the patterned filter is the presence of the pattern pattern included in the photographed image.

This pattern pattern basically results in a deterioration in the visual quality of the subject's outer image. This problem eventually leads to a problem of diminishing the moire pattern and distracting the concentration on the moire pattern.

Furthermore, since the pattern pattern is included in the outer image of the subject, it can be easily confused with a moire pattern having information on the surface curvature of the subject in the outer image of the subject. In an automated analysis of surface curvature changes, which compute the depth information of each part of the face through information such as the thickness of the contour lines of the moire pattern on the face and the spacing between the contour lines, such pattern patterns cause analysis errors. It is a major cause of it.

In the following description of the present invention, a description of the basic surface curvature measuring apparatus of the subject and a filter moving method of removing the pattern from the photographed image will be described in detail.

First, Figure 3 is a perspective view for explaining the surface bending measurement apparatus of the subject according to the present invention.

Referring to FIG. 3, the apparatus for measuring surface curvature of a subject according to the present invention includes a main component embedded inside the shielding of external light by the housing 20, and an opening portion in front of the housing 20 in which the subject is located. 23) is formed.

The interior of the housing 20 is an illumination unit 70 that emits light toward the subject, and positioned between the illumination unit 70 and the subject and transmits the light emitted from the illumination unit 70 to moire contours to the subject. Lifting the filter unit 40 for projecting, the photographing unit 60 positioned on the opposite side of the subject with respect to the filter unit 40, and the photographing unit 60 for photographing the subject through the filter unit 40, and the filter unit 40. The moving up and down part 50 is built in, and the external opening part 23 is provided with a posture maintaining part 30 for fixing the posture of the subject. The internal configuration of such a housing 20 will be described in detail later.

Basically, the housing 20 has a function of shielding external light from entering the interior, and may be made of a material having a high light blocking rate. The housing 20 is configured to cover both sides, the upper surface and the lower surface, and the front surface on which the subject is located is opened as the opening 23. Accordingly, the opening 23 is configured to form a canopy 21 in which a part of the upper surface and the side surface is extended to minimize external lighting.

In the opening part 23, a subject as a target for measuring surface curvature is positioned, and in the opening part 23, a distance between the subject as the actual measurement target and the filter part 40 is made constant, in particular, the position of the subject is determined. A posture maintaining part 30 may be provided to fix the filter part 40 as close as possible and in a constant posture. The posture maintaining part 30 may be used particularly when the subject is a human face.

In medical facilities such as dermatology, plastic surgery and orthopedic surgery, the patient places his or her face in the opening 23 to measure changes in facial flexion according to the results of human body shaping or orthopedic procedures or skin care. Having a predetermined position and posture at the opening 23 is a very important factor in measuring the curvature of the face surface. In particular, when the patient is undergoing a plastic surgery or an orthopedic procedure, the patient should be aware of the change of the surface surface curvature before and after the procedure. At this time, the patient's face has the same position and the same posture at the opening 23 before and after the procedure. The retainer 30 will function.

The posture maintaining part 30 should be placed at a certain position and at the same time have a certain posture, it is efficient to fix the face, forehead and chin of the face. Of course, it is also possible to configure the posture maintaining part in the form of a mask to fix the face in a certain position and posture, but in the case where the face face photographing is performed as in the present invention, such a posture maintaining part in the form of the mask is impossible.

The posture maintaining part 30 according to the embodiment of the present invention includes a face guide 31 for positioning a face face, a forehead guide 32 for positioning a forehead, and a jaw guide 33 for positioning a chin. Combination of the three guides to guide the face, forehead and chin of the face in a certain position as described above, the patient's face will always have a constant position and posture in the opening 23, no matter when the image is taken will be.

Specifically, the face guide 31 is composed of a frame forming a quadrangle as a whole, and both vertical frames may be positioned by mounting both side lateral portions of the face face as the face contacting portions 31a. In addition, a rotatable dial coupling portion 34 is coupled to the central portion of the upper frame and the lower frame of the face guide 31, and the dial coupling portion 34 forms an opening 23 of the housing 20. It is fixed to each of the lower and lower surfaces so that the entire face guide 31 can be rotated within a range of a certain angle. Therefore, the front of the patient's face can be fixed to be exposed to the open portion as it is to be taken, as well as to rotate the face guide 31 to allow the left and right sides of the patient to be photographed at various angles. The rotation of the face guide 31 is very important because the bending change that is a result of actual human body shaping or shaping or skin care is more persuasive to check three-dimensionally together at various side angles as well as the front angle of the face.

In addition, the forehead guide 32 and the jaw guide 33 are also coupled to the dial coupling portion 34 so as to rotate together with the face guide 31. Therefore, the forehead guide 32, the jaw guide 33, and the face guide 31 of the posture maintaining part 30, which should be positioned at a certain position and have a constant posture, are interlocked at the same angle. Because of the rotation, the patient's face can remain in the same position at any angle. Therefore, even when the photographing results measured at different points of time are continuously taken at the same face position, it is possible to efficiently and efficiently compare the photographing results. At this time, in the configuration of the forehead guide 32 and the jaw guide 33 connected through the face guide 31, the front-rear direction adjusting part 32c provided on the forehead guide 32 side includes the entire guides 31, 32, and 33. ) Can be moved back and forth. This forward and backward movement of the entire guides 31, 32, 33 makes it possible to adjust the distance between the guides 31, 32, 33 and the filter 42, thereby positioning the appropriate guide according to the size of the human head. To be determined.

Here, the forehead guide 32 has one side fixed to the dial coupling portion 34 as shown in (a) of FIG. 4, and the other end protrudes in the direction of the face guide 31 (opening direction of the housing). A forehead contact portion 32a having two protrusions is provided. The two protrusions constituting the forehead contacting portion 32a are arranged side by side horizontally and contact the forehead of the patient to limit the front and rear movement of the patient's face. Here, the forehead guide 32 is provided with a vertical direction adjustment part 32b to adjust the vertical position of the forehead contacting part 32a according to the size of the face of the person.

In addition, as shown in (b) of FIG. 4, the jaw guide 33 has one side fixed to the dial coupling portion 34 and the other end protruding in the direction of the forehead guide 32 (upper direction). A jaw contact portion 33a having two protrusions is provided. The two protrusions constituting the jaw contact portion 33a are arranged side by side horizontally and in contact with the jaw of the patient to limit the vertical movement of the patient's face. In addition, by configuring the jaw contact portion 33a with two or more protrusions, the face can be prevented from tilting. For example, a person may be inclined as he poses after placing his chin on two side-by-side protrusions. If the face is tilted, the senses (pressure) of the two parts of the jaw, which are felt by the two side-by-side protrusions, change, so the patient naturally changes the face posture in a direction that matches the senses, and the tilted face will naturally be corrected. .

Here, the dial coupling part 34 may include a pivot hinge that has a limited rotational movement at a predetermined measurement angle through rotation (rotation), thereby inducing a user's face posture to a predetermined measurement angle. That is, when it is necessary to photograph the front face, the left face, and the right face, the pivot unit 74 has a rotation angle of, for example, 0 ° and ± 60 °, so that the front face faces in the front direction (the photographing means side direction). It may be set to an angle to be made and an angle to face the left and right face faces in the front direction. Through the dial coupling part 34, various facial postures necessary for measuring facial surface curvature may be measured at a predetermined angle.

An internal configuration of the housing 20 will now be described in detail with reference to FIG. 5.

5 shows the surface bending measurement device with the housing removed.

Referring to FIG. 5, in the surface curvature measuring device according to the present invention, the filter unit 40 and the photographing unit 60 are sequentially installed on one side of the posture maintaining unit 30 on which the subject is placed. An elevating unit 50 capable of elevating and moving the filter 42 in the filter unit 40 is provided, and an illumination unit for emitting light toward the subject between the filter unit 40 and the photographing unit 60 ( 70 may be provided. Here, the filter unit 40 is positioned between the illumination unit 70 and the subject, and transmits light emitted from the illumination unit 70 to project the contour lines on the subject. The photographing unit 60 is positioned on the opposite side of the subject with respect to the filter unit 40 and photographs the subject through the filter unit 40. That is, the photographing unit 60 photographs the filter 42 and the subject together.

The object is a measurement object having a curved surface and may be a measurement object of the surface curvature measuring device according to the present invention. The subject may be a human body including a curved face as described above, and may be various industrial parts including a chassis of an automobile or various advanced parts including a semiconductor chip.

The lighting unit 70 may be composed of a light emitting diode (LED) as a device for emitting light, and employs an ultra high voltage lamp (UHP lamp) for a projector or is called a compact, lightweight and inexpensive semiconductor laser. It can consist of a laser diode or a halogen light source. In particular, the lighting unit 70 preferably emits white light mixed with light of all wavelengths of visible light.

The filter 42 of the filter unit 40 is a device that transmits light emitted from the lighting unit 70 to project contour lines on a subject. As shown in FIG. 6, various patterns are provided on a substrate 42a made of a transparent material. It is possible to form 42b. FIG. 3A illustrates an example of a filter 42 in which a plurality of straight line patterns 42b extending straight are formed on a substrate 42a, and FIG. 6B illustrates a plurality of horizontal line patterns 42b extending straight through a substrate ( It is an example of the filter 42 formed in 42a).

Herein, the substrate 42a may be formed of glass or plastic, and other materials may be used as long as the material has a high light transmittance. The pattern 42b may be formed in a plurality of vertical lines or a plurality of horizontal lines on the object side surface of the substrate 42a. According to the shape of the pattern 42b, a certain line is projected on the surface of the subject S, and the line will have a shape like a contour line according to the curvature of the subject.

The pattern 42b is preferably formed by an ink printing method or a silk screen printing method with respect to the substrate 42a. In particular, when such a pattern printing surface on the substrate 42a is formed on the lighting unit 70 side, diffuse reflection may occur by the light from the lighting unit 70, so the pattern printing surface must be arranged to be formed on the subject side. In addition, the pattern 42b may be formed on the substrate 42a by various methods such as painting, plating, and deposition in addition to the above-described ink printing method or silk screen printing method.

In addition, the pattern 42b may be configured in such a manner that a large number of threads or strings are attached to the substrate 42a in a straight line.

The thickness of the string constituting the pattern 42b may be about 0.3 mm to 1 mm. And the spacing between the rows may be about 0.3 mm to 1 mm, preferably 0.6 mm. Although will be described later, the photographing of the photographing unit 60 is performed on the subject through the filter 42 in which the pattern 42b is formed. In the present invention, preferably, light of all wavelengths of visible light is mixed as described above. Since the white light is emitted and the image is taken by the white light, the diffraction phenomenon needs to be activated more to maximize the moire of light. However, minimizing the thickness of the string and the spacing between the strings reduces the shape precision of the contour pattern projected on the subject, so that the thickness of the string is about 0.3 mm to 1 mm and the spacing between the strings is about 0.3 mm to At 1 mm, the optimal contour pattern projection and the moire phenomena will be maximized.

In addition, the filter 42 is provided with a front screen film 41 formed in a frame shape and coupled to an outer portion of the filter. The front covering film 41 is configured such that the pattern 42b of the filter 42 is exposed while the outer portion of the filter 42b is hidden when viewed from the opening 23 side.

In addition, an inner screening hood 43 is provided on the rear surface of the filter 42 (surface facing the photographing section) to cover the configuration of the photographing section 60 or the like when viewed from the opening section 23 side. The inner screening hood 43 is formed in the form of an elongated hood tube 43a facing one side of the filter 42, and is limited in view by an elongated hood tube 43a when viewed from the opening 23 side. The internal configuration is hidden. Of course, the diameter or length of the hood tube 43a should be adjusted within a range that does not limit the angle of view of the camera 63.

The photographing unit 60 is located on the opposite side of the subject with respect to the filter unit 40 and photographs the subject through the filter unit 40. The photographing unit 60 irradiates the filter unit 40 with light to project the contour pattern onto the subject, and then forms a light that is deformed and reflected from the subject onto the camera to deform the contour pattern and the subject deformed according to the surface curvature of the subject. The image is acquired.

In particular, if the filter 40 having the pattern 42b is placed directly in front of the subject, and the light is emitted through the lighting unit 70 from the opposite side of the subject, the pattern 42b of the filter 42 will produce a line in the subject. . This line will bend along the surface curvature of the subject to form a contour line. In this state, when looking at the subject through the filter 42 at the photographing unit 60 side, the undeformed pattern 42b and the line of the subject are overlapped and the wavy contour pattern is clearly displayed. This pattern is called a moire pattern, and the photographing unit 60 will photograph the moire pattern. The moire pattern has information about the surface curvature of the subject, and the user may easily recognize the surface curvature of the subject by simultaneously displaying the moire pattern and the image of the subject.

Therefore, the photographing unit 60 may be formed of a camera. In particular, the photographing unit 60 may be a camera of a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) image sensor. Herein, the camera of the photographing unit 60 may remove the IR filter in order to maximize the moire phenomenon.

The photographing unit 60 has a support plate 61 fixed to the housing 20 in an upright state, a lens hole 62 formed through the support plate 61, and a lens hole 62 in the support plate 61. And a camera 63 mounted on the rear surface of the support plate 61 (opposite side of the support plate surface facing the filter). Therefore, the camera 63 is not visible at the opening 23 of the housing 20 in which the subject is located, and only the lens is visible.

In the above description, the lighting unit 70 for emitting light toward the subject is provided between the filter unit 40 and the photographing unit 60. As a result of confirming through various experiments, when the lighting unit 70 is located in the center portion of the housing 20 in the vertical direction and the left and right directions, and emits light to the subject, the moire phenomenon occurs in the subject due to the light radiated on the same line as the subject. It was confirmed that this is partially attenuated. Therefore, the lighting unit 70 is fixed at the side position of the inner surface of the housing 20, and it was confirmed that radiating light obliquely to the subject is advantageous for maximizing the moire phenomenon. In the exemplary embodiment of the present invention, the lighting unit 70 is installed at an outer position, that is, a side position of the inner surface of the housing, on the front surface (support plate surface facing the filter) of the support plate 61.

According to the type of the subject, the surface curvature measuring apparatus of the present invention may further include reflecting means (not shown) for compensating a shadow portion formed on the subject by the irradiation angle of the illumination unit 70. The reflecting means may mitigate the shaded portion formed in the subject by reflecting the illumination to make the shaded portion to be contrasted. The reflecting means is a planar reflecting material, and may be formed of a plate with an aluminum tape attached thereto. Preferably, any other material may be used as long as it is a material capable of reflecting light. Such reflecting means is described in detail in the surface curvature measuring apparatus proposed by the present applicant (Korean Patent Publication No. 2014-0128698), so a detailed description thereof will be omitted.

Meanwhile, the surface curvature of the subject is measured by photographing a subject located in the opening part 23 of the housing 20 through the configuration of the filter unit 40, the photographing unit 60, and the lighting unit 70 in the housing 20. In this case, a problem arises in that the pattern 42b engraved in the filter 42 is included in the image due to the characteristics of the device in which the subject is photographed through the filter 42.

As shown in (a) of FIG. 7, the photographed image of the outer surface of the subject includes a pattern pattern F due to the pattern 42b engraved in the filter 42 in addition to the moire pattern M having information on the surface curvature of the subject. Will be included. Since the pattern pattern (F) is included in the external image of the subject, the pattern pattern (F) may be confused with the moire pattern (M), and each part of the face may be displayed through information such as the thickness of the contour line of the moire pattern displayed on the face and the interval between the contour lines. Computerized calculations of surface depth can lead to analysis errors in automated analysis of surface curvature changes.

In the present invention, in order to remove such a pattern pattern (F) from the outer surface image of the subject, the filter 42 by photographing while moving the filter 42, the pattern 42b is formed at the angle of view of the camera 63 including the subject during shooting By removing the pattern pattern due to the pattern 42b of FIG. 7 (see FIG. 7B), it is possible to obtain a clearer outer surface image of the subject.

To this end, the filter unit 40 is provided with a lifting unit 50 that can move the filter 42b in a lifting manner.

Referring to FIG. 5 again, the elevating unit 50 installed on the rear surface (surface facing the photographing unit) of the filter 42 in the standing state may be implemented through various driving methods.

For example, the lifting unit 50 may be composed of a lifting body coupled to the filter 42 and a screw rod for moving the lifting body in the vertical direction. The screw rod is rotated by the driving force of the motor, and the elevating body coupled to the screw rod is moved by the rotational force in the up and down direction so that the filter 42 moves.

As another example, the lifting unit 50 may be of a belt type constituted by a belt, a driving pulley and an idler (support roller). The belt will move along the track by the driving force of the motor and the filter 42 connected to the belt will move.

As another example, the lifting unit 50 may be of a gear type that is simply configured by the gear assembly. In particular, the elevating unit 50 is composed of a rack and pinion gear to move the filter 42 in a linear direction by changing the rotational movement to a horizontal movement.

As another example, the elevating unit 50 may be simply configured by installing a pulley on the upper portion and connecting a cable mounted on the pulley to the filter 42. That is, the filter 42 is moved by the force of pushing and pulling the cable.

As another example, the lifting unit 50 may be configured as a hydraulic mechanical device or may be configured through a mechanical actuator.

Although the configuration of the lifting unit 50 in various manners has been illustrated in the above examples, the present invention is not limited thereto, and any configuration may be used as long as the filter 42 can be moved in a linear direction.

Therefore, the filter 42 is moved up or down (preferably up) by the elevating unit 50 in the process of capturing the image of the outer surface of the subject, so that the pattern pattern due to the pattern 42b of the filter 42 is an afterimage. To be removed.

The removal of the pattern is such that the thin film 42b in the filter 42 is treated as a faint image so that the image is taken while the filter moves while the filter is in view. As illustrated in (b) of FIG. 7, the image of the outer surface of the subject that is clear can be obtained as compared to the state in which the filter 42 is fixed (FIG. 7 (a)).

Here, the movement of the filter 42 is irrelevant when the movement is rising or falling. However, when the pattern 42b in the filter 42 is a horizontal line pattern, the movement of the filter 42 is rising or falling. The pattern must be perpendicular to the shape of the pattern. Similarly, when the pattern 42b in the filter 42 is a vertical line pattern, the movement of the filter 42 should be left and right movement.

As shown in (a) of FIG. 8, the filter 42 is in the stopped state, and as shown in FIG. 8 (b), the filter 42 rises by a predetermined height. The picture is taken during the process. After the shooting is completed, the filter 42 is lowered as shown in FIG.

Since the thin pattern 42b in the filter 42 is treated as a faint afterimage by the movement of the filter 42, the pattern 42b is almost invisible in the photographed image. In order to achieve the following camera 63 shutter speed, the following equation (1) must be satisfied.

Pattern (42b) of the filter 42 where a plurality of lines (horizontal lines or vertical lines) to be made, wherein T _f is a filter (42) moves the line in the line l _n on the basis of a specific point of the course of the l _{n +1} Travel time to (n = 1, ... m). And t _s is the exposure time of the camera 63 photographing the filter 42.

That is, the movement time T _{f of the} filter 42 is shorter than the exposure time t _s of the camera 63 so that the afterimage removal effect of the pattern due to the movement of the filter 42 appears. This means that if the camera 63 has a fixed exposure time, the shorter the moving time T _{f of the} filter 42, that is, the faster the filter 42 moves, the higher the afterimage removal effect of the pattern. As a result, the moving speed of the filter 42 is preferably smaller than the exposure speed of the photographing camera 63.

The movement time T _f of the filter 42 and the exposure time t _s of the camera 63 are used for the use of the surface curvature measuring device according to the present invention (medical environment such as dermatology, plastic surgery, orthopedics, According to the bending and failure check of the industrial components, the bending and failure check of various advanced components including the semiconductor chip) should be selected to the optimum range within the above-described equation.

Here, a lifting slot 22 through which the filter 42 may pass is formed on the upper surface of the housing 20 as the filter 42 moves upward.

Meanwhile, the control and display means may be added in the surface curvature measuring device of such a configuration.

The control and display means may correspond to a personal computer, and include a storage unit for storing an image acquired through the photographing unit 60, a display unit for displaying the stored image, an analysis unit for analyzing a moire pattern of the image, and An input unit for controlling the operations of the photographing unit 60, the lighting unit 70, and the elevating unit 50 may be provided. Through the input unit, a user may control a photographing shutter operation of the photographing unit 60, control a turn-on / turn-off operation of the lighting unit 70, and drive the elevating unit 50 to filter 42. ) Will be able to move. Such an input unit may receive a user's manipulation by a mouse or a keyboard, and may control operations of the photographing unit 60, the lighting unit 70, and the elevating unit 50 through a simple device interface.

In addition, the analysis unit measures the thickness of the contour line of the moire pattern and the distance between the contour lines, etc. displayed on the subject (S) of the image, and calculates depth information of each part of the subject using the measured information, thereby bending the surface of the subject. Can be recognized.

A method of measuring surface curvature of a subject according to the present invention, which is made through the above-described configuration, will now be described with reference to FIG. 9. 9 is a flowchart illustrating a method for measuring surface curvature of a subject according to the present invention.

First, the subject to be measured is positioned on one side of the filter unit 40 (S10).

Here, the posture of the subject may be fixed through the posture maintaining unit 30 to fix the posture of the subject constantly, and the photographing posture may be corrected according to the size and shape of the subject.

Thereafter, the other side of the filter unit 40 emits light toward the subject through the lighting unit 70 to project the moire contour on the subject (S20).

Here, by adjusting the position and posture of the lighting unit 20 can be adjusted so that the appropriate amount of illumination and illumination angle according to the subject.

In addition, depending on the type of the subject it may be possible to remove the shadow portion of the subject through the reflecting means.

Thereafter, the elevating unit 50 is driven to raise or lower the filter 42 to move the filter 42 (S30).

At the same time, the photographing unit 60 photographs the subject through the filter 42 (S40).

The image of the photographed subject is displayed on the display unit of the control and display means (S50).

10 is a flowchart illustrating a method for analyzing surface bending changes according to the present invention.

In the image of the subject S obtained according to the present invention, the contour of the moire fringe deformed according to the bending height of the surface of the subject will be displayed. The thickness of the contour lines and the distance between the contour lines in the acquired image can be measured, and the depth information of each part of the subject can be calculated using the measured information. This allows the same subject S to be photographed at different times. By comparing the images, it is possible to analyze the change in the surface curvature of the subject. Such surface bending change algorithm may be programmed and operated in the analysis section of the control and display means.

First, the analyzer acquires a first surface image of a subject on which a contour of a moire pattern is modified according to the curved height of the surface (S110).

After a certain period of time, the analyzer acquires a second surface image of the subject on which the contour of the moire pattern is modified according to the curved height of the surface (S120).

Here, the first surface image and the second surface image are the same environmental conditions (light amount, illumination angle, etc.) and the same model state (the distance between the subject and the filter means, the photographing exposure angle of the subject, the distance between the filter means and the photographing means, etc.). Must be taken.

Thereafter, the analyzer measures the contour of the moire fringe formed by the pattern in the first surface image and the second surface image (S130).

Here, such contour measurement means to numerically measure the thickness of the moire contours in the image and the interval between the contours.

In addition, the analysis unit compares the contour measurement information of the same position with respect to the moire contours of the first surface image and the second surface image, and calculates the difference numerically to derive a change in surface curvature as a numerical analysis value ( S140).

Such a method of analyzing the change in surface curvature may be utilized for the subjects in the various fields described above, but in particular, it will have an optimal utility in directly convincing the patient of the change before and after the treatment on the face of the human body. Only visually confirming the patient's curvature of the outer surface of the face caused by plastic surgery or orthopedic procedures often breaks the trust between the patient and the medical staff because it is less objective and dependent on the subjective feeling of the patient. However, if numerically presenting changes in facial flexion before and after the procedure as in the present invention, the patient can objectively understand his or her facial changes, which can guarantee the patient's trust in the medical staff and objective data as the medical staff. It will be easy to explain the results of the procedure.

As described above, the optimum embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (25)

1. The surface curvature measuring device, characterized in that for shooting the subject via a filter having a pattern formed to move the filter during shooting.
2. The method of claim 1,

   The pattern consists of a plurality of horizontal lines,

   The filter is linked to the lifting unit, the surface bending measurement apparatus, characterized in that the lifting or lowering during shooting.
3. The method of claim 1,

   The pattern consists of a plurality of vertical lines,

   The filter is linked to the elevating unit surface curvature measuring device, characterized in that for moving in the left or right direction when shooting.
4. The method of claim 1,

   The movement speed of the filter is surface curvature measuring device, characterized in that smaller than the exposure speed of the photographing camera.
5. The method of claim 1,

   The movement of the filter is surface curvature measuring device, characterized in that the following equation.

   Equation

   T _f ≤ t _s

   Here, T _f is a moving time from a line l _n to a line l _{n +1} based on a specific point of the filter moving process (n = 1, ... m), and t _s is a camera photographing the filter. Exposure time of
6. The method of claim 1,

   A housing having an opening formed at a front thereof, the subject being positioned;

   An illumination unit positioned inside the housing and emitting light;

   A filter unit disposed between the lighting unit and the subject and formed of a filter having a stripe pattern formed thereon;

   A photographing unit positioned on an opposite side of the subject based on the filter unit and photographing the subject through the filter unit; And

   An elevating unit configured to elevate or lower the filter unit; Surface curvature measuring apparatus comprising a.
7. The method of claim 6,

   The filter,

   Transparent substrate; And

   A stripe pattern formed on the substrate; Surface curvature measuring apparatus comprising a.
8. The method of claim 7, wherein

   And said substrate is formed of glass or plastic.
9. The method of claim 7, wherein

   The pattern is a surface curvature measuring device, characterized in that formed on the subject side of the substrate a plurality of vertical lines or a plurality of horizontal lines.
10. The method of claim 9,

    Thickness of the string constituting the pattern is 0.3 mm to 1 mm, the spacing between the lines is 0.3 mm to 1 mm, characterized in that the surface bending measurement apparatus.
11. The method of claim 6,

    The lighting unit, the photographing unit and the elevating unit is controlled by the control and display means, the surface curvature measuring device, characterized in that the image photographed by the photographing unit is displayed through the control and display means.
12. The method of claim 6,

    Surface openness measurement apparatus, characterized in that the posture maintaining portion for fixing the posture of the subject is installed in the opening.
13. The method of claim 12,

    The posture maintenance unit is a surface curvature measuring device comprising a face guide for positioning the face face, forehead guide for positioning the forehead and jaw guide for positioning the chin.
14. The method of claim 13,

    The face guide is composed of a frame constituting a rectangle and the vertical frame on both sides is configured to be mounted on both sides of the face of the face as the face contact portion, the center portion of the upper frame and the lower frame are coupled to each other rotatable dial coupling portion Surface curvature measuring apparatus.
15. The method of claim 14,

    The forehead guide is a surface curvature measuring device, characterized in that one side is fixed to the dial coupling portion and the other end is provided with a forehead contact portion having at least one protrusion protruding in the direction of the face guide.
16. The method of claim 15,

    The jaw guide is one surface is fixed to the dial coupling portion and the other end is a surface bending measurement device, characterized in that provided with a jaw contact portion having at least one protrusion protruding in the direction of the forehead guide.
17. The method of claim 6,

    Surface lift measurement device, characterized in that the lifting slot is formed in the upper surface of the housing through the filter as the filter moves upward.
18. The method of claim 6,

    Surface illumination measuring device, characterized in that the lighting unit is fixed to the side position of the inner surface of the housing.
19. (a) positioning a subject to be measured on one side of the filter on which the pattern is formed;

    (b) projecting moire contours on the subject by radiating light toward the subject from the other side of the filter;

    (c) moving the filter by raising or lowering the filter;

    (d) photographing a subject in which moire contours are projected through the moving filter; And

    (e) displaying an image of the photographed subject; Surface curvature measurement method comprising a.
20. The method of claim 19,

    The pattern consists of a plurality of horizontal lines,

    In the step (c), the filter is the surface bending measurement method, characterized in that the lifting or lowering.
21. The method of claim 19,

    The pattern consists of a plurality of vertical lines,

    The method of measuring the surface curvature, characterized in that in the step (c) the filter is moved in the left or right direction.
22. The method of claim 19,

    The method of claim 1, wherein the moving time of the filter is shorter than the exposure time of the photographing camera.
23. The method of claim 19,

    The movement of the filter is a surface curvature measurement method, characterized in that the following equation.

    Equation

    T _f ≤ t _s

    Here, T _f is a moving time from a line l _n to a line l _{n +1} based on a specific point of the filter moving process (n = 1, ... m), and t _s is a camera photographing the filter. Exposure time of
24. The method of claim 19,

    And measuring the subject to be measured in the step (a) by the posture maintaining unit.
25. The method of claim 19,

    The filter is a surface curvature measurement method, characterized in that for forming a pattern formed of a plurality of vertical lines or a plurality of horizontal lines on the subject side surface of the substrate of the transparent material.

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