KR20180103646A - Apparatus and method for restructuring shape of object based on telecentricity - Google Patents

Apparatus and method for restructuring shape of object based on telecentricity Download PDF

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KR20180103646A
KR20180103646A KR1020170051482A KR20170051482A KR20180103646A KR 20180103646 A KR20180103646 A KR 20180103646A KR 1020170051482 A KR1020170051482 A KR 1020170051482A KR 20170051482 A KR20170051482 A KR 20170051482A KR 20180103646 A KR20180103646 A KR 20180103646A
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light
phase factor
hologram image
unit
dimensional shape
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KR101941062B1 (en
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김은수
김병목
박성진
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광운대학교 산학협력단
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/22Telecentric objectives or lens systems
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B21/00Microscopes
    • G02B21/0004Microscopes specially adapted for specific applications
    • G02B21/002Scanning microscopes
    • G02B21/0024Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders
    • G02B21/0028Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders specially adapted for specific applications, e.g. for endoscopes, ophthalmoscopes, attachments to conventional microscopes

Abstract

Disclosed are an apparatus for obtaining a single-shot hologram image and restoring a three-dimensional shape of an object in consideration of a telecentricity technique and a method thereof. According to the present invention, the apparatus comprises: a hologram image obtaining unit for obtaining a hologram image with respect to the object; a phase factor generator for generating a phase factor related to a phase error based on the hologram image; and a three-dimensional shape restoring unit for restoring a three-dimensional shape of the object based on the hologram image to which the phase factor is reflected.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for restoring a stereoscopic shape of an object based on telecentricity,

The present invention relates to an apparatus and a method for reconstructing a three-dimensional shape of an object based on a hologram image. More particularly, the present invention relates to an apparatus and method for acquiring a single-shot hologram image to reconstruct a three-dimensional shape of an object.

Conventionally, in order to restore the three-dimensional shape of an object, an object hologram having information on the object and a reference hologram having no information on the object are sequentially acquired, and then the phase difference between the object hologram and the reference hologram is used And restored the three-dimensional shape of the object.

However, such a method has a problem that the performance of the system is not constant due to an error that may occur due to time delay in acquiring the object hologram and the reference hologram. Also, there is a problem that the three-dimensional shape of the object is incompletely restored.

Korean Registered Patent No. 1,441,245 (Notification date: Sep. 17, 2014)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an apparatus and a method for acquiring a single-shot hologram image and restoring a three-dimensional shape of an object in consideration of a telecentricity technique. .

However, the objects of the present invention are not limited to those mentioned above, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a hologram image obtaining unit for obtaining a hologram image of an object; A phase factor generator for generating a phase factor related to a phase error based on the hologram image; And a three-dimensional reconstruction unit for reconstructing a three-dimensional shape of the object based on the hologram image on which the phase factor is reflected.

Preferably, the phase factor generator calculates the phase factor based on the radius of the spherical phase factor and the distance from the reference axis, and calculates the phase factor based on the phase factor as digital information .

Preferably, the phase factor generating unit includes a first light splitting unit that combines an object beam and a reference beam, a focal length of the first lens assembly positioned between the object, The radius of the phase factor is calculated on the basis of the distance between the first lens unit and the first light conversion unit located between the object and the object.

Preferably, the first lens assembly is located between the first light conversion portion and the first light splitting portion.

Preferably, the first light converting unit converts input light into light having a spherical wave form, the first lens assembly including: a first lens that converts the light of the spherical wave form into convergent light; And a second lens for converting the converged light into light or divergent light in the form of a plane wave.

Preferably, the hologram image acquiring unit may include a first system that controls the hologram image to be acquired based on the object light reflected from the object, or a first system that controls the hologram image to be acquired based on the object light transmitted through the object And acquires the hologram image using the second system.

Preferably, the first system further includes: a second light conversion unit that converts object light reflected from the object into spherical wave light when the first light divided from the input light is reflected from the object; A second lens assembly for converting the light of the spherical wave type into light of a plane wave type or divergent light; A second light splitting unit that combines the reference light with the object light reflected from the object converted into the plane wave type light or divergent light; And a first light reflector for reflecting the second light split from the input light and making the second light incident on the reference light.

Advantageously, the first system further comprises a first distance control unit for controlling the distance between the second light conversion unit and the second lens assembly.

Preferably, the second system further comprises: a third light splitting unit dividing input light into first light and second light; A third light converting unit for converting the object light transmitted through the object into the spherical wave light when the first light is transmitted through the object; A second light reflection part for reflecting the spherical wave type light; A third lens assembly for converting the reflected spherical wave light into a plane wave type light or divergent light; A fourth light splitting unit which combines the object light transmitted through the object converted into the plane wave type light or the divergent light with the reference light; And a third light reflection part for reflecting the second light and making the light enter the reference light.

Preferably, the second system further comprises a second distance control unit for controlling a distance between the third light conversion unit and the third lens assembly.

According to another aspect of the present invention, there is provided an image processing method comprising: obtaining a hologram image of an object; Generating a phase factor associated with the phase error based on the hologram image; And reconstructing a three-dimensional shape of the object based on the hologram image in which the phase factor is reflected.

Preferably, the generating step may calculate the size of the phase factor based on the radius of the phase factor in the spherical form and the distance from the reference axis, and calculate the phase factor based on the size of the phase factor, .

Preferably, the generating step includes a first light splitting unit combining the object light and the reference light, a focal length of the first lens assembly positioned between the object, and a second light splitting unit positioned between the first light splitting unit and the object The radius of the phase factor is calculated based on the distance between the first light converting portion and the first lens assembly.

Advantageously, the generating uses the first lens assembly positioned between the first light splitting section and the first light splitting section when calculating the radius of the phase factor.

Preferably, the acquiring step includes a first system that controls the hologram image to be acquired based on the object light reflected from the object, or a first system that controls the hologram image to be acquired based on the object light transmitted through the object And acquires the hologram image using the second system.

The present invention also proposes a computer program stored on a computer readable medium for executing a method of reconstructing a three-dimensional shape of an object in a computer.

The present invention can achieve the following effects through the above-described configurations.

First, phase information can be extracted by only one hologram without using a reference hologram, and it is also possible to reconstruct the three-dimensional shape of the object. In addition, it is possible to more fully reconstruct the three-dimensional shape of the object than when using both the object hologram and the reference hologram, and it becomes possible to measure the three-dimensional shape of the object in real time.

Second, the system configuration can be simplified as compared with the conventional digital holographic microscope system, thereby reducing the size of the entire system and reducing costs.

1 is a conceptual diagram illustrating an internal structure of a single shot reflection type digital holographic microscope system according to a first embodiment of the present invention.
FIG. 2 is a conceptual view schematically showing an internal configuration of a tube lens constituting a single shot reflection type holographic microscope system. FIG.
3 is a diagram showing a spherical phase factor included in the object hologram obtained by the CCD.
4 is a reference diagram for explaining the effective interference fringe region.
5 is a conceptual diagram illustrating an internal structure of a single shot transmission type digital holographic microscope system according to a second embodiment of the present invention.
6 is a flowchart schematically illustrating an operation method of a single shot reflection type digital holographic microscope system according to a first embodiment of the present invention.
FIG. 7 is a reference view for explaining a method of operating the single shot reflection type digital holographic microscope system according to the first embodiment of the present invention.
FIG. 8 is a conceptual diagram schematically illustrating an internal configuration of an apparatus for restoring a three-dimensional object according to a preferred embodiment of the present invention.
9 is a conceptual diagram for explaining a relation between an apparatus for restoring a three-dimensional shape of an object and a first system according to a preferred embodiment of the present invention.
FIG. 10 is a conceptual diagram for explaining a relation between an apparatus for restoring a three-dimensional shape of an object and a second system according to a preferred embodiment of the present invention.
11 is a flowchart schematically illustrating a method for restoring a three-dimensional shape of an object according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

An interferometer is a mechanism that divides the light from the same light source into two or more beams to make a difference in the propagation path, and then observes the interference phenomenon that occurs when the light meets again. Mach-Zender interferometer, Michelson interferometer, etc., are complicated in system configuration and vulnerable to vibration. Therefore, in the past, a large amount of lateral shearing interferometer was used to generate a hologram image. However, in the hologram image acquired through the shear interferometer, the shape of the same object is doubly overlapped, and the phase information of the object is distorted at the overlapped portion.

On the other hand, the conventional single shot interferometer has a complicated system configuration, takes up a lot of space, and is expensive. In addition, the digital single shot technique using the conventional single shot interferometer has a problem that the processing speed is lowered due to complicated digital processing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a single-shot digital holographic microscope capable of solving the problem that a shape of an object appears as a double object and restoring a three- shot digital holographic microscopy and its measurement method.

In addition, the present invention proposes a single-shot digital holographic microscope and its measurement method which can simplify the system configuration and reduce the cost compared to a two-wavelength system capable of measuring a single shot.

A digital holographic microscope is a microscope that acquires hologram information (interference fringes) through a digital imaging device based on a holography technique and measures three-dimensional shape information of the object through the holographic information.

If a general microscope is a device that measures the shape of an object by measuring the intensity distribution of light reflected or transmitted from an object by irradiating the ordinary light source to the object, the digital holographic microscope can detect the interference of light that occurs when a plurality of lights meet Dimensional shape information of the target object by using the interference fringe information in the form of interference fringes, extracting the phase information from the acquired interference fringe information, and using the extracted phase information.

In other words, digital holography technology generates light of a single wavelength such as a laser, divides it into two lights using a light splitter, and directs one light (reference light) directly to the image sensor, ), When the light reflected by the object to be measured is reflected on the image sensor, (4) the reference light and the object light cause interference in the image sensor, (5) the interference fringe information of such light is recorded by the digital image sensor, This is a technique for restoring the shape of an object to be measured by using a computer with interference fringe information. The interference fringe information to be recorded according to (5) is generally referred to as a hologram.

On the other hand, in the case of the conventional optical holography technology, which is not digital holography, the procedure from ① to ④ is the same, but in order to record the interference fringe information of light in ⑤ and restore the shape of the object in ⑥ When the reference light is projected on a special film on which interference fringes are recorded, the shape of the virtual object to be measured is restored to the position where the original object is located.

The digital holographic microscope measures the interference fringe information of the light with the digital image sensor, digitally encodes it, and stores the stored interference fringe information in a computer device There is a difference in that the shape of the object to be measured is restored by processing by an arithmetic method.

The system proposed in the present invention can achieve a simplified system configuration and a cost reduction effect as compared with a two-wavelength system capable of a single-shot measurement method. To this end, the system proposed in the present invention can operate in the following order.

First, the reflection type system will be described. In the case of a reflective system, the light output from the laser is split into two lights by a light splitter. One of the divided beams is reflected from the reflective sample, passes through the objective lens and the tube lens in turn, and returns to the beam splitter. The other one of the split lights is also reflected from the optical mirror and returned to the optical splitter. The two returned light are combined by a light splitter into a single light beam in front of the CCD and form an interference fringe at an oblique angle caused by a slightly inclined optical mirror. The interference fringes formed at this time are acquired through the CCD.

Next, the transmission type system will be described. In the case of a transmissive system, the light output from the laser is split into two lights by the first light splitter. One of the divided lights is an object beam, which passes through a transmissive object and then passes through an objective lens and a tube lens in order. The other one of the divided lights is a reference beam, which is split by the first light splitter and the object light, and does not pass through any of the elements, and the second light splitter meets the object light. The object light and the reference light interfere with each other in the second optical splitter, and acquire the object hologram through the CCD.

In addition, the system proposed in the present invention can reconstruct the three-dimensional shape of an object with only one object hologram image. The detailed explanation is as follows.

The system adjusts the position of the tube lens located on the object light side to form object light in the form of a spherical wave of a form that can be calculated. The system then interferes with the object light and the plane-wave-shaped reference light to acquire the object hologram through the CCD camera. Once the object hologram is acquired, the system extracts the phase information through the object hologram.

The object hologram from which the phase information is extracted contains the spherical phase factor together. Here, the phase factor of the spherical shape is determined by the position of the tube lens located on the object light side. According to the present invention, by calculating and generating a spherical phase factor through the positional information of the tube lens, it is possible to obtain only the phase information of the measurement object finally by removing it from the phase information of the object hologram. Also, by using the phase information of the object obtained in this manner, it is possible to restore the three-dimensional shape information of the object.

A single-shot digital holographic microscope based on a computer telecentricity proposed in the present invention has been described briefly. Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a conceptual diagram illustrating an internal structure of a single shot reflection type digital holographic microscope system according to a first embodiment of the present invention. 1 is a block diagram of a computer telecentric based single shot reflection type digital holographic microscope system 100 capable of reconstructing three-dimensional shape information of an object with only one object hologram.

The first light source unit 111 functions to generate and output a beam. In the present invention, the first light source unit 111 may be formed of a laser.

The first rotation diffusion plate 112 functions to remove speckle noise from the light when the light output from the first light source unit 111 is input. Speckle noise is one of the characteristics of a laser light source. Such speckle noise acts as noise in measuring the shape of an object, which can have a considerable adverse effect on accurately restoring the three-dimensional shape of the object. Thus, in the present invention, the speckle noise is removed from the light output by the first light source unit 111 by using the first rotation diffusion plate 112.

The first collimator 113 performs a function of deforming the light of the form of divergence when the speckle-free light is input by the first rotation diffusion plate 112 into a parallel beam shape .

The first beam cutter 114 functions to adjust the size of the parallel light beam deformed by the first collimator 113. The first beam cutter 114 adjusts the size of the beam according to the apertures of the first tube lens 116 and the first objective lens 117.

The first beam splitter 115 divides the light when the size-adjusted light is input by the first beam cutter 114. Any one of the beams divided by the first beam splitter 115 is reflected by the first object 118 and is input to the first beam splitter 115 again while the other beam is reflected by the first object 118 The light is reflected from the first optical mirror 119 and is input to the first optical splitter 115 again.

Hereinafter, for convenience of explanation, a beam reflected by the first object 118 and input to the first beam splitter 115 is defined as a first beam, and the beam reflected from the first optical mirror 119 is reflected by the first beam splitter 115 is defined as a second beam.

The first beam is reflected by the first object 118 and is then input to the first beam splitter 115 through the first objective lens 117 and the first tube lens 116 in turn. And the second beam is reflected by the first optical mirror 119 and then input back to the first optical splitter 115. When the first beam and the second beam are inputted again, the first beam splitter 115 outputs the first beam and the second beam in a direction in which the first CCD (Charge Coupled Device) 121 is located. That is, the first beam splitter 115 reflects the first beam and outputs the first beam in a direction in which the first CCD 121 is positioned, and transmits the second beam in a direction in which the first CCD 121 is positioned.

The first objective lens 117 performs a function of converting the first beam into a beam of a spherical wave type when the first beam is reflected from the first object 118 and input.

The first tube lens 116 performs a function of converting a spherical-wave-shaped beam having passed through the first objective lens 117 into a beam having a plane wave-shaped beam. As shown in FIG. 2, the first tube lens 116 may have a structure in which the first lens 131 and the second lens 132 are combined. FIG. 2 is a conceptual view schematically showing an internal configuration of a tube lens constituting a single shot reflection type holographic microscope system. FIG.

The beam passing through the first objective lens 117 proceeds in the form of diverging light. The first lens 131 performs a function of focusing such a beam. The first lens 131 may be realized, for example, as a condensing lens.

The second lens 132 functions to convert the beam passing through the first lens 131 into parallel light. In the present invention, such a second lens 132 may be embodied as a convex lens. The second lens 132 can also convert the beam that has passed through the first lens 131 into divergent light.

Referring back to FIG.

The first tube lens 116 has the effect of reducing the distortion of the two-dimensional image in terms of geometrical optics. In addition, the first tube lens 116 can obtain the following effect in terms of the hologram.

The beam that has passed through the first objective lens 117 is a light having a spherical wave form and includes a type of phase error (phase error or phase aberration). Conventionally, a hologram image (reference hologram) was obtained in the absence of an object, and the phase error was canceled through the phase difference between the reference hologram and the object hologram. However, this method has the disadvantage that the performance of the system is not constant due to the errors that can be caused by the time delay in acquiring the object hologram and the reference hologram.

In contrast, the present invention solves such a potential problem by converting a spherical-wave beam into a plane-beam beam using the first tube lens 116, and at the same time, solving the problem of a three-dimensional shape of the object without a reference hologram Can be accurately restored. This minimizes the phase error included in the object hologram, thereby making it unnecessary to acquire the reference hologram, which is required in the existing system.

The first optical mirror 119 reflects the second beam and enters the first optical splitter 115. The second beam is reflected from the first optical mirror 119 and transmitted through the first optical splitter 115 to be combined with the first light in front of the first CCD 121 to generate an interference fringe.

The first CCD 121 performs the function of acquiring the generated interference fringes.

The first computer 122 performs a function of restoring the three-dimensional shape of the first object 118 based on the interference fringe. The first computer 122 calculates the quantitative size information of the first object 118 based on the hologram image (object hologram) acquired by the first CCD 121, Restore the shape.

The first controller 123 functions to adjust the distance between the first objective lens 117 and the first tube lens 116.

The distance between the first objective lens 117 and the first tube lens 116 is a factor that determines whether a single shot is possible. The first controller 123 adjusts the degree of phase bending of the first beam through adjustment of the distance between the first objective lens 117 and the first tube lens 116 to achieve the object of the present invention can do. The first controller 123 is connected to the first computer 122 and controls the distance between the first objective lens 117 and the first tube lens 116 under the control of the first computer 122 can do.

Also, the distance between the first objective lens 117 and the first tube lens 116 is a factor controlling the spherical phase factor. This will be described in detail below.

The object hologram obtained by the first CCD 121 includes a spherical phase factor due to the first objective lens 117, which can be defined as a kind of phase error (phase error or phase aberration).

In the conventional system, the hologram image, that is, the reference hologram was acquired even without the object, and the phase error was canceled based on the difference value between the object hologram and the reference hologram. However, the conventional system has a disadvantage that the performance of the system is not constant due to the error caused by the time delay when acquiring the object hologram and the reference hologram.

In the digital holographic microscope system 100 proposed in the present invention, the computerized telecentric based single shot reflection type holographic microscope system 100 uses spherical wave type object light by using the first tube lens 116, Type object light. The digital holographic microscope system 100 solves the above-mentioned problem and can accurately reconstruct the three-dimensional shape of the object without the reference hologram.

In addition, the digital holographic microscope system 100 minimizes the phase error included in the object hologram using the first tube lens 116, thereby eliminating the need for a reference hologram unlike the existing system. However, in order to minimize the phase error included in the object hologram, it is necessary to accurately calculate the size of the spherical phase factor.

The spherical phase factor is related to the position of the first tube lens 116. The relationship between the radius of the spherical phase factor and the position of the first tube lens 116 can be expressed by the following Equation 1:

Figure pat00001

In the above, the radius of curvature (ROC) means the radius of the spherical phase factor. In other words, ROC denotes the diameter of the spherical wave generated by the first objective lens 117. f TL denotes the focal length of the first tube lens 116 and d denotes the distance between the first tube lens 116 and the first objective lens 117.

The ROC is heavily influenced by the design of the digital holographic microscope system 100, particularly the magnification of the first objective lens 117. In the DHM technique, which requires acquisition of information on an object of a micro or nano unit, there is a curvature due to the use of a high magnification objective lens. This acts as noise when restoring object information. Reducing or eliminating this noise is a very important challenge in DHM technology.

According to Equation (1), the radius of the spherical phase factor varies depending on the position of the first tube lens 116.

However, the spherical phase factor refers to a factor that distorts quantitative information related to the size in the process of obtaining the size information of the first object 118. Accordingly, in order to accurately reconstruct the three-dimensional shape information of the first object 118, it is necessary to remove the spherical phase factor.

The present invention calculates and generates a spherical phase factor based on the position of the first tube lens 116 mounted on the digital holographic microscope system 100 using the relationship according to Equation 1 to remove the spherical phase factor .

3 is a diagram showing a spherical phase factor included in the object hologram obtained by the CCD. The size of the spherical phase factor 200 can be obtained by the following equation (2).

Figure pat00002

Where R denotes the radius of the spherical phase factor 200, and r denotes the distance from the reference axis. The reference axis means an optical axis, that is, an axis with respect to a direction in which light travels. Referring to FIG. 3, when a wave generated as the light advances is assumed to have a sector shape, in the present invention, a line when the sector is drawn down to the center of the sector is defined as a reference axis. r means the distance from the reference axis to the edge of the CCD sensor.

Also, Z means the size of the spherical phase factor 200.

Using Equation (2), it becomes possible to accurately calculate the size of the spherical phase factor 200 and generate the spherical phase factor 200 as digital information. Once the spherical phase factor 200 is generated as digital information, it is possible to eliminate all of the spherical phase factors 200 in the object hologram, thereby accurately acquiring the three-dimensional shape information of the first object 118 It becomes.

The first beam passed through the first tube lens 116 is reflected by the first optical splitter 115 and reflected by the first optical mirror 119 and then transmitted through the first optical splitter 115, The beam and the first CCD 121 are overlapped to form an interference fringe. At this time, the angle of the first optical mirror 119 can be appropriately adjusted in order to adjust the effective interference fringe region generated by the object region and the reference region.

The area of the effective interference fringe will be described with reference to Fig. 4 is a reference diagram for explaining the effective interference fringe region.

The first beam passed through the first tube lens 116 is reflected by the first beam splitter 115 and proceeds to the first CCD 121 and the second beam reflected by the first optical mirror 119 Passes through the first optical splitter 115, and then proceeds to the first CCD 121.

Referring to FIG. 4, the first beam reflected by the first beam splitter 115 includes an R 1 (Reference 1) region 311 and an O 1 (Object 1) region 312. The second beam transmitted through the first beam splitter 115 includes an R2 (Reference 2) region 321 and an O2 (Object 2) region 322. [ The R1 region 311 and the R2 region 321 refer to a reference region that does not include information on the first object 118 and the O1 region 312 and the O2 region 322 refer to the first object 118 (313, 323) for the object region.

The first beam and the second beam are combined in front of the first CCD 121 to form an interference fringe. However, in the case where the overlap region 330 is generated by the O1 region 312 of the first beam and the R2 region 321 of the second beam, in order to form a desired interference pattern in the present invention, 1 information 313 about the object 180 should be formed in this overlapping area 330. [ That is, in the present invention, the effective interference fringe refers to an interference fringe in which the information 313 of the first object 180 is contained in the overlapping region 330, and the interference fringe region is defined as an effective fringe region.

In the present invention, control means (not shown) other than the first controller 123 is provided so that the information 313 about the first object 118 can be included in the overlap region 330 through the control means. The angle of the optical mirror 119 can be adjusted. In the present invention, it is also possible for the first controller 123 to adjust the angle of the first optical mirror 119.

In this embodiment, the angle of the first optical mirror 119 refers to the tilt angle of the digital holographic microscope system 100. The tilt angle can be defined as the angle between the object beam (first beam) and the reference beam (second beam), which is related to the first CCD 121.

When the angle between the object beam and the reference beam is 0 degrees, the digital holographic microscope system 100 is an on-axis system, and when the angle between the object beam and the reference beam is not 0 degrees, the digital holographic microscope system 100 is off -axis system.

In the present embodiment, when the off-axis system is used, the tilt angle can be set within a range of 3 -? To 3 + ?. The tilt angle can be controlled based on the number of revolutions of the first controller 123 (or the control means).

The computer telecentric based single shot reflection type digital holographic microscope system 100 has been described with reference to FIGS. 1 to 4. FIG. Next, a computer telecentric based single shot transmissive digital holographic microscope system will be described.

5 is a conceptual diagram illustrating an internal structure of a single shot transmission type digital holographic microscope system according to a second embodiment of the present invention. FIG. 5 is a block diagram of a computer telecentric-based single shot transmission type digital holographic microscope system 400 capable of restoring three-dimensional shape information of an object with only one object hologram.

The second light source unit 411 performs a function of generating and outputting a beam. The second light source unit 411 has the same concept as the first light source unit 111 of FIG.

The second rotation diffusion plate 412 performs a function of removing speckle noise from the light when the light output from the second light source unit 411 is input. The second rotation diffusion plate 412 has the same concept as the first rotation diffusion plate 112 in Fig.

The second collimator 413 performs a function of transforming the light of the form of diverging when the speckle-free light is input by the second rotation diffusion plate 412 into a parallel beam shape. The second collimator 413 has the same concept as the first collimator 113 of FIG.

The second beam cutter 414 functions to adjust the size of the parallel beam deformed by the second collimator 413. The second beam cutter 414 adjusts the size of the beam to be incident on the second tube lens 416 and the second objective lens 417 in accordance with the aperture of the second tube lens 416 and the second objective lens 417. The second beam cutter 414 has the same concept as the first beam cutter 114 of FIG.

The second beam splitter 415a functions to split the light that has passed through the second beam cutter 414. The second optical splitter 415a has the same concept as the first optical splitter 115 of FIG.

The third light, which is any one of the lights split by the second light splitter 415a, is split into the reference light by the second light splitter 415a and then transmitted through the second object 418 3 beam splitter 415b. The third light is split by the second optical splitter 415a and then incident on the second optical mirror 419a and then reflected by the second optical mirror 419a and incident on the third optical splitter 415b.

The fourth light, which is the other one of the lights split by the second light splitter 415a, is split into the object light by the second light splitter 415a and then transmitted through the second object 418, And the light splitter 415b meets the reference light. The fourth light is split by the second light splitter 415a and then transmitted through the second object 418 and then transmitted through the second objective lens 417, the third optical mirror 419b, the second objective lens 416, And the like are sequentially incident on the third optical splitter 415b.

The second objective lens 417 transmits a beam whose size is adjusted by the second beam cutter 414 through the second beam splitter 415a and then passes through the second object 418. When the beam passes through the second object 418, Into an object beam of a light source. The second objective lens 417 has the same concept as the first objective lens 117 of FIG.

The third optical mirror 419b reflects the light that has passed through the second objective lens 417 and performs a function of making the second tube lens 416 enter the second optical lens 419b. The third optical mirror 419b has the same concept as the second optical mirror 419a.

The second tube lens 416 functions to convert spherical-shaped object light reflected by the third optical mirror 419b into plane-wave-shaped light. The second tube lens 416 has the same concept as the first tube lens 116 of FIG.

The second tube lens 416 may be configured such that the first lens 131 and the second lens 132 are coupled to each other, as shown in FIG. 2, as in the case of the first tube lens 116. The first lens 131 and the second lens 132 have been described above, and a detailed description thereof will be omitted here.

The third light is incident on the third light splitter 415b without transmitting the second object 418 as reference light. The fourth light is incident on the third light splitter 415b after passing through the second object 418 as object light. When the third light and the fourth light cause interference with the third light splitter 415b, the second CCD 421 performs a function of acquiring the interference fringe generated by the coupling between the third light and the fourth light do. The second CCD 421 has the same concept as the first CCD 121 of FIG.

The second computer 422 performs a function of restoring the three-dimensional shape of the second object 418 based on the interference fringe obtained by the second CCD 421. [ The second computer 422 calculates the quantitative size information of the second object 418 based on the hologram image (object hologram) acquired by the second CCD 421 and then calculates the quantitative size information of the second object 418, Restore the shape. The second computer 422 is the same concept as the first computer 122 of FIG.

The second controller 423 controls the distance between the second objective lens 417 and the second tube lens 416. The second controller 423 has the same concept as the first controller 123 of FIG. The above-described function of the second controller 423 has been described above with reference to FIG. 3, and a detailed description thereof will be omitted here.

On the other hand, the second controller 423 can adjust the tilt value of the third optical mirror 419b. The second controller 423 can adjust the angle of the third optical mirror 419b to set an effective reference area according to the position and size of the second object 418 to be measured.

The structure of the computer telecentric single shot reflection type holographic microscope system 100 will be described with reference to FIGS. 1 to 4. Referring to FIG. 5, a computer telecentric based single shot transmission type digital holography The structure of the microscope system 400 has been described.

Hereinafter, a method for restoring the three-dimensional shape of an object using the computer telecentric-based single shot reflection type digital holographic microscope system 100 of FIG. 1 will be described.

6 is a flowchart schematically illustrating an operation method of a single shot reflection type digital holographic microscope system according to a first embodiment of the present invention. And FIG. 7 is a reference view for explaining a method of operating the single shot reflection type holographic microscope system according to the first embodiment of the present invention.

The following description relates to a method for restoring the three-dimensional shape of the first object 118 using the single shot reflection type digital holographic microscope system 100 of FIG. 1, but this method is not limited to the single shot transmissive digital holography The same applies to the method using the graphic microscope system 400.

First, the first controller 123 adjusts the spherical phase factor (phase error) state to minimize the beam bending by adjusting the distance between the first objective lens 117 and the first tube lens 116 (S510).

Then, the first CCD 121 acquires an object hologram including information on the first object 118 (S520).

The object hologram obtained by the first computer 122 may be represented as a complex conjugate hologram as follows.

U (x, y, 0)

In the above, U (x, y, 0) denotes the three-dimensional spatial coordinate of the object hologram.

Then, the first computer 122 acquires the phase information of the object hologram (S530).

The first computer 122 acquires information about the first object 118 from the object hologram using a two-dimensional Fourier transform and filtering method. The first computer 122 then extracts the phase information of the object hologram from the information about the first object 118 using each spectral method and two-dimensional inverse Fourier transform.

The process by which the first computer 122 extracts the phase information of the object hologram can be expressed by Equation (3).

Figure pat00003

In the above,? (X, y) denotes the phase information of the object hologram. Im [U (x, y, d)] denotes the imaginary part of the object hologram, and Im [U (x, y, d)] denotes the imaginary part of the object hologram.

Then, the first computer 122 calculates and generates a spherical phase factor based on the phase information of the object hologram (S540).

The phase information of the object hologram obtained by the first computer 122 includes a spherical phase factor. The phase information of the object hologram including the spherical phase factor is as shown in Figs. 7 (a) and 7 (b).

To remove this spherical phase factor, the first computer 122 first calculates the radius of the spherical phase factor using equation (1). The first computer 122 then generates digital information of the spherical phase factor using equation (2).

Then, the first computer 122 compares the phase information of the object hologram with the digital information of the spherical phase factor to calculate the difference value between the phase information of the object hologram and the digital information of the spherical phase factor, The phase information of only one object 118 is obtained (S550). The phase information of only the first object 118 from which the spherical phase factor is removed is as shown in (c) and (d) of FIG.

The first computer 122 then obtains the quantitative size information of the first object 118 based on the phase information of the first object 118 only, The shape is restored (S560).

The first computer 122 converts the phase information of only the first object 118 into quantitative thickness information of the first object 118 to be measured. The thickness information converted by the first computer 122 is shown in Equation (4).

Figure pat00004

In the above,? L means thickness information of the first object 118. ? denotes the wavelength of the laser, and? n (x, y) denotes the refractive index difference.

The first computer 122 then restores the three-dimensional shape of the first object 118 based on the thickness information of the first object 118 obtained using Equation (4).

1 to 7, an embodiment of the present invention has been described. Best Mode for Carrying Out the Invention Hereinafter, preferred forms of the present invention that can be inferred from the above embodiment will be described.

FIG. 8 is a conceptual diagram schematically illustrating an internal configuration of an apparatus for restoring a three-dimensional object according to a preferred embodiment of the present invention.

8, the object shape restoration apparatus 600 includes a hologram image obtaining unit 610, a phase factor generating unit 620, a three-dimensional shape restoring unit 630, a power source unit 640, and a main control unit 650 .

The power supply unit 640 functions to supply power to each configuration of the three-dimensional shape restoration device 600 of the object.

The main control unit 650 performs a function of controlling the overall operation of each constituent constituting the three-dimensional shape restoration apparatus 600 of the object.

The hologram image acquiring unit 610 acquires a hologram image for an object. The hologram image obtaining unit 610 is a concept corresponding to the first CCD 121 of FIG. 1 and the second CCD 421 of FIG.

The phase factor generator 620 generates a phase factor related to a phase error on the basis of the hologram image obtained by the hologram image acquiring unit 610. The phase factor generator 620 is a concept corresponding to the first computer 122 of FIG. 1 and the second computer 422 of FIG.

The phase factor generator 620 may calculate the phase factor, and may generate the phase factor as digital information based on the phase factor. Here, the phase factor generator 620 may calculate the phase factor based on the radius of the spherical phase factor and the distance from the reference axis.

The phase factor generator 620 may also calculate the focal length of the first lens assembly and the radius of the phase factor based on the distance between the first light conversion portion and the first lens assembly. Wherein the first light conversion portion and the first lens assembly may be positioned between the first light splitting portion and the object.

The first light splitting unit performs a function of coupling an object beam and a reference beam. The first light splitting unit is a concept corresponding to the first light splitter 115 in FIG. 1 and the third light splitter 415b in FIG.

The first light converting unit performs a function of converting input light into light having a spherical wave form. The first light converting unit is a concept corresponding to the first objective lens 117 of FIG. 1 and the second objective lens 417 of FIG.

The first lens assembly performs a function of converting light of a spherical wave type into light of a plane wave type or divergent light. The first lens assembly is of a concept corresponding to the first tube lens 116 of FIG. 1 and the second tube lens 416 of FIG. The first lens assembly may be positioned between the first light conversion portion and the first light splitting portion.

The first lens assembly may include a first lens and a second lens. The first lens performs a function of converting spherical-wave-shaped light into converged light. The second lens functions to convert the converged light into light of a plane wave type or divergent light.

The three-dimensional shape restoring unit 630 restores the three-dimensional shape of the object based on the hologram image in which the phase factor is reflected. The three-dimensional shape restoring unit 630 is a concept corresponding to the first computer 122 in Fig. 1 and the second computer 422 in Fig.

On the other hand, the hologram image obtaining unit 610 can obtain the hologram image using the first system that controls the hologram image to be acquired based on the object light reflected from the object. The hologram image acquiring unit 610 may acquire a hologram image using a second system that controls the acquisition of the hologram image based on the object light transmitted through the object. This will be described below.

9 is a conceptual diagram for explaining a relation between an apparatus for restoring a three-dimensional shape of an object and a first system according to a preferred embodiment of the present invention.

The first system 700 is a concept corresponding to the computer telecentric based single shot reflective digital holographic microscopy system 100 of FIG. Referring to FIG. 9, the first system 700 includes a second light conversion unit 710, a second lens assembly 720, a second light splitting unit 730, and a first light reflection unit 740.

The second light converting unit 710 converts the object light reflected from the object 760 into spherical wave light when the first light divided from the input light is reflected from the object 760. The second light converting portion 710 is a concept corresponding to the first objective lens 117 of FIG.

The second lens assembly 720 performs a function of converting spherical-wave-shaped light into plane-wave-shaped light or divergent light. The second lens assembly 720 is of a concept corresponding to the first tube lens 116 of FIG.

The second light splitter 730 performs a function of coupling the reference light and the object light reflected from the object, which is converted into light of a plane wave type or divergent light. The second light splitter 730 is a concept corresponding to the first optical splitter 115 of FIG.

The first light reflection unit 740 reflects the second light divided from the input light and performs the function of making the reflected light incident on the second light splitter 730 as a reference light. The first light reflection portion 740 is a concept corresponding to the first optical mirror 119 of FIG.

The first system 700 may further include a first distance controller 750.

The first distance control unit 750 controls the distance between the second light conversion unit 710 and the second lens assembly 720. The first distance controller 750 is a concept corresponding to the first controller 123 of FIG.

FIG. 10 is a conceptual diagram for explaining a relation between an apparatus for restoring a three-dimensional shape of an object and a second system according to a preferred embodiment of the present invention.

The second system 800 is a concept corresponding to the computer telecentric based single shot transmissive digital holographic microscopy system 400 of FIG. 10, the second system 800 includes a third light splitting unit 810, a third light conversion unit 820, a second light reflection unit 830, a third lens assembly 840, A division portion 850 and a third light reflection portion 860.

The third light splitter 810 divides the input light into the first light and the second light. The third light splitter 810 is a concept corresponding to the second light splitter 415a of FIG.

When the first light passes through the object 760, the third light converting unit 820 converts the object light transmitted through the object 760 into spherical wave light. The third light converting portion 820 is a concept corresponding to the second objective lens 417 in Fig.

The second light reflection part 830 reflects light of a spherical wave form. The second light reflection portion 830 is a concept corresponding to the third optical mirror 419b in Fig.

The third lens assembly 840 performs a function of converting the reflected spherical wave type light into plane wave type light or divergent light. The third lens assembly 840 is of a concept corresponding to the second tube lens 416 of FIG.

The fourth light splitter 850 combines the reference light and the object light transmitted through the object, which is converted into light of a plane wave type or divergent light. The fourth light splitter 850 is a concept corresponding to the third light splitter 415b of FIG.

The third light reflection portion 860 reflects the second light and performs a function of making the reflected light incident on the fourth light splitter 850 as a reference light. The third light reflection portion 860 is a concept corresponding to the second optical mirror 419a in Fig.

The second system 800 may further include a second distance controller 870.

The second distance control unit 870 controls the distance between the third light conversion unit 820 and the third lens assembly 840. The second distance control unit 870 is a concept corresponding to the second controller 423 of FIG.

Next, an operation method of an apparatus for restoring a three-dimensional object shape 600 according to a preferred embodiment of the present invention will be described. 11 is a flowchart schematically illustrating a method for restoring a three-dimensional shape of an object according to a preferred embodiment of the present invention.

First, the hologram image acquiring unit 610 acquires a hologram image of an object (S910).

Then, the phase-parameter generator 620 generates a phase-related phase factor based on the hologram image (S920).

Thereafter, the three-dimensional shape restoration unit 630 restores the three-dimensional shape of the object based on the hologram image in which the phase factor is reflected (S930).

It is to be understood that the present invention is not limited to these embodiments, and all elements constituting the embodiment of the present invention described above are described as being combined or operated in one operation. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. In addition, such a computer program may be stored in a computer readable medium such as a USB memory, a CD disk, a flash memory, etc., and read and executed by a computer to implement an embodiment of the present invention. As the recording medium of the computer program, a magnetic recording medium, an optical recording medium, or the like can be included.

Furthermore, all terms including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined in the Detailed Description. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (16)

  1. A hologram image acquiring unit acquiring a hologram image of an object;
    A phase factor generator for generating a phase factor related to a phase error based on the hologram image; And
    And a reconstruction unit for reconstructing a three-dimensional shape of the object based on the hologram image in which the phase factor is reflected,
    And an image reconstruction device for reconstructing the three-dimensional shape of the object.
  2. The method according to claim 1,
    The phase factor generating unit may calculate the phase factor based on the radius of the spherical surface factor and the distance from the reference axis and generate the phase factor as digital information based on the phase factor Wherein the three-dimensional shape restoring device comprises:
  3. 3. The method of claim 2,
    Wherein the phase factor generating unit includes a first light splitting unit that combines an object beam and a reference beam, a focal length of the first lens assembly located between the object and the first light splitting unit, And the radius of the phase factor is calculated on the basis of a distance between the first light converting unit and the first lens assembly.
  4. The method of claim 3,
    Wherein the first lens assembly is positioned between the first light conversion unit and the first light splitting unit.
  5. 5. The method of claim 4,
    The first light converting unit converts input light into light having a spherical wave form,
    Wherein the first lens assembly comprises:
    A first lens for converting the spherical wave-shaped light into convergent light; And
    And a second lens for converting the converged light into light of a plane wave type or divergent light
    And an image reconstruction device for reconstructing the three-dimensional shape of the object.
  6. The method according to claim 1,
    The hologram image acquiring unit may include a first system that controls the hologram image to be acquired based on the object light reflected from the object, or a second system that controls the hologram image to be acquired based on the object light transmitted through the object And the hologram image is obtained by using the hologram image.
  7. The method according to claim 6,
    The first system comprises:
    A second light converting unit for converting the object light reflected from the object into light of a spherical wave form when the first light divided from the input light is reflected from the object;
    A second lens assembly for converting the light of the spherical wave type into light of a plane wave type or divergent light;
    A second light splitting unit that combines the reference light with the object light reflected from the object converted into the plane wave type light or divergent light; And
    A first light reflection part for reflecting the second light split from the input light and making the light enter the reference light,
    And an image reconstruction device for reconstructing the three-dimensional shape of the object.
  8. 8. The method of claim 7,
    The first system comprises:
    A first distance control unit for controlling a distance between the second light converting unit and the second lens assembly,
    Further comprising: an object restoring device for restoring the three-dimensional shape of the object.
  9. The method according to claim 6,
    The second system comprises:
    A third light splitting unit splitting the input light into the first light and the second light;
    A third light converter for converting the object light transmitted through the object into the spherical wave light when the first light is transmitted through the object;
    A second light reflection part for reflecting the spherical wave type light;
    A third lens assembly for converting the reflected spherical wave light into a plane wave type light or divergent light;
    A fourth light splitting unit which combines the object light transmitted through the object converted into the plane wave type light or the divergent light with the reference light; And
    A third light reflection portion for reflecting the second light and making the light enter the reference light,
    And an image reconstruction device for reconstructing the three-dimensional shape of the object.
  10. 10. The method of claim 9,
    The second system comprises:
    And a second distance control unit for controlling a distance between the third light converting unit and the third lens assembly,
    Further comprising: an object restoring device for restoring the three-dimensional shape of the object.
  11. Acquiring a holographic image of an object;
    Generating a phase factor associated with the phase error based on the hologram image; And
    Reconstructing a three-dimensional shape of the object based on the hologram image in which the phase factor is reflected
    Dimensional shape of the object.
  12. 12. The method of claim 11,
    The generating step may include calculating the size of the phase factor based on the radius of the spherical phase factor and the distance from the reference axis and generating the phase factor as digital information based on the phase factor size A method for reconstructing a three-dimensional shape of an object.
  13. 13. The method of claim 12,
    Wherein the generating step includes a first light splitting unit combining the object light and the reference light, a focal length of the first lens assembly positioned between the object, and a second light splitting unit positioned between the first light splitting unit and the first light splitting unit, And calculating a radius of the phase factor based on a distance between the first lens assembly and the first lens assembly.
  14. 14. The method of claim 13,
    Wherein the generating comprises using the first lens assembly located between the first light splitting part and the first light splitting part when calculating the radius of the phase factor.
  15. 12. The method of claim 11,
    Wherein the acquiring step includes a first system for controlling the hologram image to be acquired based on the object light reflected from the object, or a second system for controlling the hologram image to be acquired based on the object light transmitted through the object And the hologram image is obtained by using the hologram image.
  16. A computer program stored in a computer-readable medium for executing a method for reconstructing a three-dimensional shape of an object according to any one of claims 11 to 15 in a computer.
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Publication number Priority date Publication date Assignee Title
KR101126369B1 (en) * 2008-12-31 2012-03-23 (주)와이티에스 Laser beam measurment of direct type
KR20120112987A (en) * 2011-04-04 2012-10-12 한국과학기술연구원 Digital holographic microscope system and method for acquiring three-dimensional image information using the same
KR101441245B1 (en) 2013-05-29 2014-09-17 제주대학교 산학협력단 Digital Holographic Microscope Apparatus
KR20160029358A (en) * 2014-09-05 2016-03-15 광운대학교 산학협력단 Apparatus and method for restructuring shape of object using single beam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101126369B1 (en) * 2008-12-31 2012-03-23 (주)와이티에스 Laser beam measurment of direct type
KR20120112987A (en) * 2011-04-04 2012-10-12 한국과학기술연구원 Digital holographic microscope system and method for acquiring three-dimensional image information using the same
KR101441245B1 (en) 2013-05-29 2014-09-17 제주대학교 산학협력단 Digital Holographic Microscope Apparatus
KR20160029358A (en) * 2014-09-05 2016-03-15 광운대학교 산학협력단 Apparatus and method for restructuring shape of object using single beam

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