KR101078877B1 - Apparatus for measuring three-dimensional shape - Google Patents

Abstract

A three-dimensional shape measuring apparatus is disclosed.

The disclosed measuring device transmits a first wavelength light, a second wavelength light, a third wavelength light, and a fourth wavelength light through a first grid, a second grid, a third grid, and a fourth grid, respectively, to the subject. The grid pattern is generated, the grid pattern image is photographed by the image sensing unit to obtain a phase shifted interference pattern, and a three-dimensional shape is measured from the interference pattern.

Description

Apparatus for measuring three-dimensional shape}

The present invention relates to an apparatus for simply and quickly measuring a three-dimensional shape of a subject.

A three-dimensional shape measurement device using moire interference fringes forms a moire interference fringe by overlapping a lattice pattern that appears by irradiating light with a certain shape on the surface of an object to be measured (hereinafter referred to as an object) with a lattice pattern as a reference. And a device that obtains information about the height of the object surface by measuring and analyzing the interference fringes. Such a measuring method is widely used in the medical and industrial fields because it is possible to easily and quickly obtain a three-dimensional shape of a subject. Here, in particular, a moiré interference pattern, which is a spatial interference pattern, is used. The moiré pattern is a pattern that appears when overlapping spatial patterns having periodicity are illustrated in FIG. 1.

There are two methods of measuring the three-dimensional shape of the subject by using the moiré interference fringe. The shadow method is a method of measuring the surface shape of a subject by using a moire fringe generated from the shadow of the lattice pattern appearing on the surface of the subject without using a lens, and the projection method is a projection of the grid projected onto the subject using a lens. It is a method of measuring the surface shape of a subject by using a moire fringe generated from an image.

Figure 2 shows a shadow phase transition moiré three-dimensional shape measurement apparatus using a conventional grid. In this measuring device, the light emitted from the light source 1 passes through the grating 3 to form a grating shadow on the surface of the object p, or a grating image is generated by the talbot effect. The grating 3 used here functions to change the intensity of transmitted light. The moire pattern is formed by combining the shadow image of the grid 3 and the pattern of the grid itself, and the moiré pattern thus generated is called a shadow moiré (Vol. 32, No. 7 Optical Engineering, 1668-1674, 1993). This moiré pattern is measured using a two-dimensional array of image sensing elements, and in order to calculate the phase of the moiré pattern, a plurality of phase shifted moire patterns are required ("Phase Shifting Intererometery, in Optical Shop Testing, D. Malacare"). , 2nd Ed.John Wiley & Sons Inc, New York, 1992)

In order to obtain a phase shifted moire fringe, the grating 103 is moved by the driving means D toward the subject p or away from the subject p. Then, since the phase of the interference fringe changes in accordance with the movement of the grating 3, three or more phase shifted moire fringes can be obtained. The phase shifted moire pattern generated by moving the grating 3 is thus formed on the image sensing device 10 by the imaging lens 5. The image sensing element 10 sequentially repeats the measurement of the phase shifted moiré pattern and the movement of the grating 3. Using a plurality of phase-shifted moire fringes obtained here, three-dimensional shape information of an object can be obtained through a known analysis method.

By the way, the three-dimensional shape measurement apparatus as described above has no choice but to mechanically move the grating for the phase shift of the moire pattern. Due to such mechanical driving, the phase shifting speed is slow, the speed control is difficult, and the lattice fabrication is difficult and the manufacturing cost is high.

The present invention has been made to solve the above problems, and an object thereof is to provide a three-dimensional shape measuring apparatus capable of phase shifting without the need to mechanically move the grating.

In order to achieve the above object, an embodiment of the present invention, a light source; A first wavelength light that travels the white light irradiated from the light source along a first path, a second wavelength light that travels on a second path, a third wavelength light that travels on a third path, and a fourth path that travels on a fourth path An optical separation unit for separating into wavelength light; A first grid disposed on the first path; A second grid disposed on the second path; A third grid disposed on the third path; A fourth grid disposed on the fourth path; A light synthesizing unit configured to advance the first wavelength light, the second wavelength light, the third wavelength light, and the fourth wavelength light in the same path; An image sensing unit configured to photograph a plaid image formed on the subject by light passing through the light combining unit, wherein the first grid, the second grid, the third grid, and the fourth grid have the same lattice period, and each grid Provided is a three-dimensional shape measurement apparatus in which the array is shifted by one quarter of a cycle.

According to another embodiment of the present invention, the optical separation unit,

A first dichroic filter for transmitting a first wavelength light and a second wavelength light of the light from the light source and reflecting the third wavelength light and the fourth wavelength light; A second dichroic filter transmitting the first wavelength light and reflecting the second wavelength light; And a third dichroic filter reflecting the third wavelength light and transmitting the fourth wavelength light.

According to another embodiment of the present invention, the light combining unit,

A first reflecting mirror reflecting the first wavelength light; A fourth dichroic filter transmitting the first wavelength light and reflecting the second wavelength light; A second reflecting mirror reflecting the third wavelength light; A fifth dichroic filter reflecting the third wavelength light and transmitting the fourth wavelength light; And a sixth dichroic filter reflecting the first wavelength light and the second wavelength light and transmitting the third wavelength light and the fourth wavelength light.

According to another embodiment of the present invention, the light combining unit,

A first dichroic filter reflecting the first wavelength light and transmitting the remaining wavelength light; A second dichroic filter reflecting the second wavelength light and transmitting the remaining wavelength light; A third dichroic filter reflecting the third wavelength light and transmitting the remaining wavelength light; And a fourth dichroic filter reflecting the fourth wavelength light and transmitting the remaining wavelength light.

According to another embodiment of the present invention, the image sensing unit comprises: a first image sensing element for capturing an image by the first wavelength light; A second image sensing element for capturing an image by the second wavelength light; A third image sensing element for capturing an image by the third wavelength light; And a fourth image sensing device for capturing an image by the fourth wavelength light.

According to another embodiment of the invention, the first light source for irradiating the first wavelength light; A second light source for irradiating a second wavelength light; A third light source for irradiating third wavelength light; A fourth light source for irradiating the fourth wavelength light; A light synthesizing unit for synthesizing the first wavelength light, the second wavelength light, the third wavelength light, and the fourth wavelength light to travel in the same optical path; A first grid disposed on an optical path between the first light source and the light combining unit; A second grid disposed on an optical path between the second light source and the light combining unit; A third grid disposed on an optical path between the third light source and the light combining unit; A fourth grid disposed on an optical path between the fourth light source and the light combining unit; And an image sensing unit configured to photograph a plaid image formed on the subject by light passing through the light synthesizing unit, wherein the first lattice, the second lattice, the third lattice, and the fourth lattice have the same lattice period. In addition, the present invention provides a three-dimensional shape measuring apparatus in which each lattice array is shifted by a quarter period.

According to another embodiment of the present invention, the first, second, third, and fourth wavelength light passing through the first grid, the second grid, the third grid, and the fourth grid simultaneously forms a lattice pattern on the subject. Create

The three-dimensional shape measuring device according to the present invention can easily measure the three-dimensional shape quickly and easily because there is no need to move the grating mechanically to phase shift the moire interference fringe, and precisely three-dimensional shape because there is no mechanical operation. Can be measured. In addition, since a plurality of phase shifts are performed at the same time, the phase shift process can be quickly implemented, so that the photographing speed is significantly faster and the control is easier. Therefore, the three-dimensional shape measuring apparatus according to the present invention can be advantageously used when photographing a moving subject. For example, it is possible to simply photograph a human face in three dimensions, and expand the application field by incorporating the captured image into a computer game or an educational program.

Hereinafter, a three-dimensional shape measuring apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The three-dimensional shape measuring apparatus according to the present invention implements a phase shift of a moire fringe without having to move the grating by using a plurality of gratings in which the grating arrangement is shifted. The moire monet is generated by the interference between the lattice pattern formed on the subject P through the lattice and the virtual lattice pattern generated by the computer.

3, the apparatus for measuring a three dimensional shape according to an exemplary embodiment of the present invention may include a light source 50 and a light separation unit 57 that separates light emitted from the light source 50 into a plurality of wavelength light; And a light synthesizing unit 65 for synthesizing the plurality of wavelength lights to travel in the same optical path. In addition, a plurality of gratings are provided in an optical path between the light separation unit 57 and the light combining unit 65.

The light source 50 is a light source that irradiates white light, and the white light is separated into a plurality of wavelength light by the light separation unit 57. For example, the light separation unit 51 transmits the first wavelength light L1 and the second wavelength light L2 of the white light, and the third wavelength light L3 and the fourth wavelength light L4. The first dichroic filter 58 reflecting the light, the second dichroic filter 60 transmitting the first wavelength light L1, and reflecting the second wavelength light L2, and the first dike. And a third dichroic filter 78 that reflects the third wavelength light L3 reflected by the loch filter 58 and transmits the fourth wavelength light L4. As a result, the optical separation unit 57 may include a first wavelength light L1 traveling in the first path, a second wavelength light L2 running in a second path, and a third path traveling in a third path. It can separate into three wavelength light L3 and the 4th wavelength light L4 which progresses to a 4th path.

The optical separation unit 57 may include a first reflection mirror 68 and a third dichroic filter for converting optical paths of the second wavelength light L2 reflected by the second dichroic filter 60. A second reflection mirror 80 may be further included to convert the optical path of the fourth wavelength light L4 passing through the 78. The light separation unit 57 is for separating the light emitted from the white light source into four wavelength bands and is not limited to the above-described configuration, and may be variously changed. For example, the first wavelength light may be red light, the second wavelength light may be yellow light, the third wavelength light may be green light, and the fourth wavelength light may be blue light.

At least one lens may be provided on the optical path between the light source 50 and the light separation unit 57. For example, the at least one lens may include a first lens 52, a second lens 54, and a third lens 56.

A plurality of gratings are provided on the optical path between the light separation unit 57 and the light combining unit 65. For example, a third lattice 72 and a third wavelength light travel in a first path 64 through which the first wavelength light travels and a second path through which the second wavelength light travels. The fourth grid 90 is provided in the fourth path through which the third grid 84 and the fourth wavelength light travel. First wavelength light passing through the first lattice 64, the second wavelength light passing through the second lattice 72, the third wavelength light passing through the third lattice 84 and the fourth lattice The fourth wavelength light that has passed through 90 generates a lattice pattern in the subject P, respectively.

As shown in FIG. 4, the first lattice 64, the second lattice 72, the third lattice 84, and the fourth lattice 90 have the same lattice period T. As illustrated in FIG. The lattice arrangement is shifted by T / 4, respectively. In other words, the lattice arrangement of the second lattice 72 is shifted by T / 4 with respect to the first lattice 64, and the third lattice 84 has its lattice arrangement with respect to the second lattice 72. The fourth grid 90 is shifted by T / 4, and the lattice arrangement is shifted by T / 4 with respect to the third grid 84. The three-dimensional shape measuring apparatus according to the present invention can obtain a phase shifted moire fringe by shifting the lattice arrangement of the first grid, the second grid, the third grid, and the fourth grid. Here, four phase shifted moire patterns are obtained.

The first wavelength light L1 passing through the first lattice 64, the second wavelength light L2 passing through the second lattice 72, and the third wavelength light passing through the third lattice 84. (L3) and the fourth wavelength light (L4) passing through the fourth grid 90 is synthesized through the light synthesizing unit (65) and proceed in the same path, and simultaneously the first and the first Generate second, third and fourth plaids.

Referring to FIG. 3, the light combining unit 65 may include a third reflecting mirror 66 and a second lattice 72 reflecting the first wavelength light L1 passing through the first lattice 64. The fourth dichroic filter 74 and the third lattice 84 reflecting the second wavelength light L2 passing through and transmitting the first wavelength light L1 reflected by the third reflection mirror 66. A fifth dichroic filter 92 for reflecting the third wavelength light L3 passing through the second wavelength light and transmitting the fourth wavelength light L4 passing through the fourth grid 90, and the first wavelength. The sixth dichroic filter 76 reflects light and the second wavelength light and transmits the third wavelength light and the fourth wavelength light. The light combining unit 65 may further include a fourth reflecting mirror 86 for converting an optical path of the third wavelength light L3 passing through the third grid 84.

On the other hand, on the optical path between the light combining unit 57 and the first lattice 64 on the optical path between the first band pass filter 62 and the light combining unit 57 and the second lattice 72. On the optical path between the second band pass filter 70, the light combining unit 57 and the third grid 84, a third band pass filter 82, and the light combining unit 57 and the fourth A fourth band pass filter 90 may be further provided on the optical path between the gratings 90. Undesired noise may be removed through the first, second, third and fourth band pass filters 62, 70, 82, and 88.

At least one lens may be further provided between the light combining unit 65 and the subject P to focus the light passing through the light combining unit 64 onto the subject P. For example, a fourth lens 94 and a fifth lens 95 may be further disposed between the light combining unit 65 and the object P.

The first, second, third and fourth plaids are photographed by the image detector 98. At least one lens may be further provided between the subject P and the image detector 98. For example, a sixth lens 96 and a seventh lens 97 may be further disposed between the subject P and the image detector 98.

First, second, third and fourth plaid patterns formed on the subject P by the first grid 64, the second grid 72, the third grid 84, and the fourth grid 90. May be distinguished by different wavelengths, for example, a first wavelength, a second wavelength, a third wavelength, and a fourth wavelength. The first, second, third and fourth plaids photographed by the image sensing unit 98 are input to the computer 99 and cause interference with the virtual plaids generated by the computer 99. Phase-shifted first, second, third and fourth moire interference fringes can be obtained.

A three-dimensional shape is generated by processing a moire pattern phase shifted by the first lattice 64, the second lattice 72, the third lattice 84, and the fourth lattice 90 by using a phase shift algorithm. . In the present invention, a phase map corresponding to a moiré pattern is obtained by applying a four-step phase shifting algorithm to four phase-shifted moiré monies. In general, the phase shift algorithm obtains a phase by taking an arc tangent to a function represented by the intensity distribution of each image. Due to the characteristics of the arc tangent function, the generated phase is limited to the region of -π / 2 to π / 2 or the region of -π to π. Therefore, the phase map obtained by the phase shift algorithm has a discontinuous part. The phase map obtained in this step is called a wrapping phase map, and the process of connecting these discontinuous parts is called an unwrapping process.

When the phase map is multiplied by the wavelength of the moire fringe through an unwrapping process, the phase is restored to the height of the subject P. FIG. As a result, the three-dimensional shape of the subject is measured. Such a three-dimensional shape measurement method is disclosed in "Phase Shifting Intererometery, in Optical Shop Testing, D. Malacara, 2nd Ed. John Wiley & Sons Inc, New York 1992".

Next, FIG. 5 shows a modification of the light combining unit 65 'of the three-dimensional shape measuring apparatus according to the embodiment of the present invention. Compared with FIG. 3, the remaining components except for the light combining unit 65 'are the same. The light combining unit 65 ′ is configured to reflect the first wavelength light L1 passing through the first lattice 64 and transmit the remaining wavelength light to the fourth dichroic filter 161 and the second lattice ( A second dichroic filter 162 reflecting the second wavelength light L2 passing through the second wavelength light and transmitting the first wavelength light L1 reflected by the first dichroic filter 161; The third dichroic filter 163 and the fourth grid reflecting the third wavelength light L3 passing through the three grids 84 and transmitting the first and second wavelength light L2 and L3. And a fourth dichroic filter 164 that reflects the fourth wavelength light L4 that has passed through 90 and transmits the first, second and third wavelength light L1, L2, and L3. can do. The first dichroic filter 161 may be replaced with a reflection mirror. A reflection mirror 165 may be further provided to convert a path of the first to fourth wavelength light synthesized by the light combining unit 65 ′. The reflection mirror 165 is used to efficiently convert the spatial arrangement of the optical elements. The light combining unit 65 ′ passes through the first, second, third, and fourth gratings 64, 72, 84, 90 and proceeds in different optical paths. The third and fourth wavelength lights L1, L2, L3, and L4 are allowed to travel in the same path. However, the light synthesizing unit 65 'is not limited thereto, and various modifications can be made by those skilled in the art.

First, second, third, and fourth wavelength light beams L1, L2, and L3 passing through the first, second, third, and fourth gratings 64, 72, 84, and 90. L4 simultaneously generates different first, second, third, and fourth plaids on the subject P, and the lattices are shifted in different phases and distinguished by different wavelengths. Can be. The first, second, third, and fourth plaids are photographed by the image detector 98. The image sensing unit 98 may be configured as, for example, a CCD. It is also possible to photograph the first, second, third and fourth plaids with one CCD.

Alternatively, as illustrated in FIG. 6, the image sensing unit 98 may include a plurality of image sensing elements. For example, the image detecting unit 98 may include a first image sensing element 116 for capturing an image by the first wavelength light L1 and a second image capturing an image by the second wavelength light L2. 2 an image sensing element 118, a third image sensing element 120 for capturing an image by the third wavelength light L3, and a fourth image sensing element 122 for capturing an image by the fourth wavelength light. It may include.

The image detector 98 transmits the first wavelength light and the second wavelength light among the first, second, third, and fourth wavelength light reflected from the subject P, and the third wavelength light and the third wavelength light. The first dichroic filter 101 reflects the four wavelengths of light, and transmits the first wavelength light of the first wavelength light and the second wavelength light that has passed through the first dichroic filter 101, and the second wavelength. The second dichroic filter 103 for reflecting light and the third wavelength light and the fourth wavelength light passing through the first dichroic filter 101 are reflected to reflect the fourth wavelength light. It may further include a third dichroic filter 105 for transmitting. A fourth reflecting mirror 104 for reflecting the second wavelength light reflected by the second dichroic filter 103 to change the optical path, and a fourth passing through the third dichroic filter 105. A second reflecting mirror 106 may be further provided to reflect the wavelength light to convert the optical path. The first wavelength light passing through the second dichroic filter 103 is incident on the first image sensing element 116, and the second wavelength light reflected by the second dichroic filter 103 is second. The third wavelength light incident on the image sensing element 118 and reflected by the third dichroic filter 105 is incident on the third image sensing element 120 and the third dichroic filter 105. The fourth wavelength light having passed through is incident on the fourth image sensing device 122.

On the other hand, the first band pass filter 107 on the optical path between the second dichroic filter 103 and the first image sensing element 116, the second dichroic filter 103 and the second The second band pass filter 110 is disposed on the optical path between the image sensing elements 118, and the third band pass is disposed on the optical path between the third dichroic filter 105 and the third image sensing element 120. The filter 112 may further include a fourth band pass filter 114 on the optical path between the third dichroic filter 105 and the fourth image sensing device 122. The first, second, third, and fourth band pass filters 107, 110, 112, and 114 remove unwanted noise to obtain a clearer image.

Next, a three-dimensional shape measuring apparatus according to another embodiment of the present invention will be described with reference to FIG.

3D shape measurement apparatus according to another embodiment of the present invention includes a plurality of light sources for irradiating different wavelength light. For example, as illustrated in FIG. 7, the first light source 251 for irradiating the first wavelength light L1, the second light source 252 for irradiating the second wavelength light L2, and the third wavelength light ( A third light source 253 for irradiating L3) and a fourth light source 254 for irradiating the fourth wavelength light L4 may be provided. FIG. 8 shows the spectral power distribution according to the wavelength of light emitted from the first light source, the second light source, the third light source, and the fourth light source. For example, the first wavelength light includes red light (peak wavelength of about 625 nm), and The second wavelength light may be yellow light (peak wavelength of about 590 nm), the third wavelength light may be green light (peak wavelength of about 525 nm), and the fourth wavelength light may be blue light (peak wavelength of about 465 nm). The first wavelength light L1, the second wavelength light L2, the third wavelength light L3, and the fourth wavelength light L4 travel in different optical paths and are identical by the light combining unit 260. Synthesized by optical path. The light combining unit 260 reflects, for example, the first dichroic filter 265 and the second wavelength light L2 that reflect the first wavelength light L1 and transmit other wavelength light. The second dichroic filter 266 for transmitting the light of different wavelengths, the third dichroic filter 267 for reflecting the third wavelength light of L3 and transmitting the light of another wavelength, and the fourth A fourth dichroic filter 268 reflecting the wavelength light L4 and transmitting another wavelength light may be included. The fourth dichroic filter 268 may be replaced with a reflective mirror. On the optical path between the first light source 254 and the first dichroic filter 265, the first grating 261 is a light between the second light source 252 and the second dichroic filter 266. The second grating 262 on the path, the third grating 263 on the light path between the third light source 253 and the third dichroic filter 267, the fourth light source 254 and the fourth light source. A fourth grating 268 is provided on the optical path between the four dichroic filters 268.

The first, second, third, and fourth gratings 261, 262, 263, and 264 have the same grating period, and the grating arrangement of each grating is shifted by (period / 4). This is substantially the same as described with reference to FIG. On the optical path between the first light source 251 and the first grid 261, a first band pass filter 255 is on the optical path between the second light source 252 and the second grid 262. The second band pass filter 256, the third band pass filter 263 on the optical path between the third light source 253 and the third grid 263, the fourth light source 254 and the fourth A fourth band pass filter 258 may be further provided on the optical path between the gratings 264.

The first, second, third and fourth wavelength light beams L1, L2, L3, and L4 synthesized by the light combining unit 260 are first, second, and third to the subject P. Generate third and fourth plaids. The first, second, third and fourth plaids are photographed by the image detector 277. The first, second, third and fourth plaids captured by the image sensing unit 277 are input to the computer 279, and the first, second, third and fourth plaids are input to the computer 279. Interfering with the imaginary lattice generated in c) generates first, second, third and fourth moire interference fringes. The first, second, third and fourth moire interference fringes are phase shifted by a quarter wavelength with respect to the wavelength λ of the interference fringes.

On the other hand, the reflective mirror 270 may be further provided to change the path of the first, second, third, and fourth wavelength light via the first dichroic filter 265. In addition, at least one lens may be further provided on the optical path between the first dichroic filter 265 and the object P. For example, a first lens 271 and a second lens 272 may be further provided on the optical path between the first dichroic filter 265 and the object P. In addition, at least one lens may be further provided between the subject P and the image detector 277. For example, a third lens 274 and a fourth lens 275 may be provided between the object P and the image detector 277.

The image sensing unit 277 may be configured as one image sensing element or as a plurality of image sensing elements. In the case of a plurality of image sensing elements, the configuration may be performed according to the example described with reference to FIG. 6. However, the present invention is not limited thereto and may be variously changed.

The first grid pattern, the second grid pattern, the third grid pattern, and the fourth grid pattern photographed by the image sensing unit 277 are inputted to the computer 279, and the first to fourth grid patterns and the computer. An imaginary lattice pattern by (279) interferes to obtain four phase shifted moire patterns. The three-dimensional shape of the subject P is obtained through an unwrapping process using a phase shifted moire fringe.

As described above, the three-dimensional shape measuring apparatus according to the present invention can accurately and clearly measure the three-dimensional shape of the subject by applying a moire fringe generation algorithm and a phase shift algorithm. In addition, the three-dimensional shape measuring apparatus according to the present invention can obtain a phase shifted moire fringe without having to move the grating using four gratings whose grating arrangement is shifted with respect to the light of four wavelength bands. In addition, by using four gratings can simultaneously obtain a phase shifted moire fringe, it is possible to measure a three-dimensional shape simply and quickly. Thus, the three-dimensional shape measuring apparatus according to the present invention can be advantageously applied to measure the three-dimensional shape of a moving subject because four grid patterns can be obtained simultaneously without moving the grid for phase shift.

The above embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined by the technical idea of the invention described in the following claims.

1 shows a moiré interference fringe.

Figure 2 schematically shows a conventional three-dimensional shape measuring apparatus.

Figure 3 shows a three-dimensional shape measuring apparatus according to an embodiment of the present invention.

Figure 4 shows the lattice arrangement relationship of the gratings provided in the three-dimensional shape measurement apparatus according to an embodiment of the present invention.

Figure 5 shows a modification of the three-dimensional shape measuring apparatus according to an embodiment of the present invention.

6 illustrates an example of an image sensing unit provided in a 3D shape measuring apparatus according to an embodiment of the present invention.

7 illustrates a three-dimensional shape measuring apparatus according to another embodiment of the present invention.

FIG. 8 illustrates spectral power distribution according to wavelengths of first, second, third and fourth light sources included in a three-dimensional shape measuring apparatus according to another exemplary embodiment of the present invention.

<Description of main part of drawing>

50,251,252,253,254 ... light source, 57 ... light separation unit

58,60,78,74,76,92 ... Dichroic Filter

62,70,82,88 ... band pass filter,

64,72,84,90,261,262,263,264 ... lattice

65,65 '... optical synthesis unit

P ... subject, 98,277 ...

99,279 ... Computer

Claims (11)

Light source; A first wavelength light that travels the white light irradiated from the light source along a first path, a second wavelength light that travels on a second path, a third wavelength light that travels on a third path, and a fourth path that travels on a fourth path An optical separation unit for separating into wavelength light; A first grid disposed on the first path; A second grid disposed on the second path; A third grid disposed on the third path; A fourth grid disposed on the fourth path; A light synthesizing unit configured to advance the first wavelength light, the second wavelength light, the third wavelength light, and the fourth wavelength light in the same path; An image sensing unit configured to photograph a plaid image formed on the subject by light passing through the light synthesizing unit, And the first lattice, the second lattice, the third lattice, and the fourth lattice have the same lattice periods, and each lattice arrangement is shifted by a quarter period. The method of claim 1, wherein the optical separation unit, A first dichroic filter for transmitting a first wavelength light and a second wavelength light of the light from the light source and reflecting the third wavelength light and the fourth wavelength light; A second dichroic filter transmitting the first wavelength light and reflecting the second wavelength light; And And a third dichroic filter which reflects the third wavelength light and transmits the fourth wavelength light. The light synthesizing unit according to claim 1 or 2, A first reflecting mirror reflecting the first wavelength light; A fourth dichroic filter transmitting the first wavelength light and reflecting the second wavelength light; A second reflecting mirror reflecting the third wavelength light; A fifth dichroic filter reflecting the third wavelength light and transmitting the fourth wavelength light; And And a sixth dichroic filter reflecting the first wavelength light and the second wavelength light and transmitting the third wavelength light and the fourth wavelength light. The light synthesizing unit according to claim 1 or 2, A fourth dichroic filter reflecting the first wavelength light and transmitting the remaining wavelength light; A fifth dichroic filter reflecting the second wavelength light and transmitting the remaining wavelength light; A sixth dichroic filter reflecting the third wavelength light and transmitting the remaining wavelength light; And a seventh dichroic filter reflecting the fourth wavelength light and transmitting the remaining wavelength light. The method according to claim 1 or 2, A first band pass filter disposed between the optical separation unit and the first grating; A second band pass filter disposed between the optical separation unit and the second grating; A third band pass filter disposed between the optical separation unit and the third grating; And And a fourth band pass filter disposed between the light separation unit and the fourth grating. The method of claim 1 or 2, wherein the image sensing unit, A first image sensing element for capturing an image by the first wavelength light; A second image sensing element for capturing an image by the second wavelength light; A third image sensing element for capturing an image by the third wavelength light; And And a fourth image sensing element for capturing the image by the fourth wavelength light. A first light source for irradiating the first wavelength light; A second light source for irradiating a second wavelength light; A third light source for irradiating third wavelength light; A fourth light source for irradiating the fourth wavelength light; A light synthesizing unit for synthesizing the first wavelength light, the second wavelength light, the third wavelength light, and the fourth wavelength light to travel in the same optical path; A first grid disposed on an optical path between the first light source and the light combining unit; A second grid disposed on an optical path between the second light source and the light combining unit; A third grid disposed on an optical path between the third light source and the light combining unit; A fourth grid disposed on an optical path between the fourth light source and the light combining unit; And And an image sensing unit configured to photograph a plaid image formed on the subject by the light passing through the light synthesizing unit. And the first lattice, the second lattice, the third lattice, and the fourth lattice have the same lattice periods, and each lattice arrangement is shifted by a quarter period. The method of claim 7, wherein the light combining unit, A first dichroic filter reflecting the first wavelength light and transmitting the remaining wavelength light; A second dichroic filter reflecting the second wavelength light and transmitting the remaining wavelength light; A third dichroic filter reflecting the third wavelength light and transmitting the remaining wavelength light; And a fourth dichroic filter which reflects the fourth wavelength light and transmits the remaining wavelength light. The method according to claim 7 or 8, A first band pass filter disposed between the first light source and the first grating; A second band pass filter disposed between the second light source and the second grating; A third band pass filter disposed between the third light source and the third grating; And And a fourth band pass filter disposed between the fourth light source and the fourth grating. The method of claim 7 or 8, wherein the image sensing unit, A first image sensing element for capturing an image by the first wavelength light; A second image sensing element for capturing an image by the second wavelength light; A third image sensing element for capturing an image by the third wavelength light; And And a fourth image sensing element for capturing the image by the fourth wavelength light. The method according to claim 1 or 7, And a first, second, third, and fourth wavelength light beam having passed through the first grid, the second grid, the third grid, and the fourth grid to simultaneously generate a grid pattern on the subject.

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