KR101967554B1 - Method for measuring spatial information using index line and apparatus thereof - Google Patents

Abstract

A method for measuring spatial information using a leader and an apparatus using the method are disclosed. According to an embodiment of the present invention, there is provided a measuring method comprising the steps of projecting a polygonal leader line onto a first object and a second object, projecting the polygonal leader line onto the first object and the second object, The method of claim 1, further comprising: extracting a plurality of trend lines corresponding to a first side of a plurality of sides constituting the polygonal shape based on the photographed image, Extracting a first intersection corresponding to a boundary of the first object and a second intersection corresponding to a boundary of the second object on the basis of the first intersection and the second intersection, And determining a distance between the second objects. At this time, the first intersection point and the second intersection point may correspond to inflection points generated by projecting the first side at a certain angle not perpendicular to the first object and the second object.

Description

[0001] METHOD FOR MEASURING SPATIAL INFORMATION USING INDEX LINE AND APPARATUS THEREOF [0002]

The following embodiments relate to a method for measuring spatial information using a leader and to an apparatus using the method.

The distance between two objects can be divided into four categories. First, the distance is measured using a physical scale that is the same as the first. Second, a laser or other signal is transmitted from one object to another , And the reflected wave reflected from the surface of the object is measured. At this time, the distance between the transmission time and the reception time can be measured using the transmission wave speed. Third, there is a satellite distance measurement method using GPS which is used recently. In the case of $ GPGGA format, the method using GPS includes information on latitude and longitude as well as altitude, and it is possible to measure the vertical displacement of the structure using it. However, most of the equipment with high accuracy that can be applied to bridge structures is expensive. Therefore, there is a disadvantage that the cost is high when applied to the field. In addition, there is a disadvantage in that the accuracy of measurement of the distance between objects within a distance of 1m is low.

Finally, there is a method of measuring the distance between objects by projecting a laser to the object and then performing image analysis. After projecting a straight line of laser beam onto the object, the light intensity of the projected laser is analyzed to recognize the lower intensity of the light as a crack, and the length of the section is calculated from the pixel information on the digital photograph The crack width size can be calculated. However, in this method, since the laser projection angle and the surface of the object must be perpendicular to each other, the accuracy can be deteriorated according to the installation conditions of the camera and the laser, and the error range can be relatively large because only one factor of light intensity is used .

Related prior patents are Korean Patent Laid-Open No. 10-2004-0020261 on an apparatus and method for crack detection of a structure by image input.

The embodiments below are intended to accurately measure spatial information at low cost using a leader.

According to one embodiment, the measuring method includes projecting a polygonal leader to the first object and the second object; Photographing the first object and the second object in a state in which the polygonal leader line is projected on the first object and the second object to obtain a captured image; Extracting a plurality of trend lines corresponding to a first side of the plurality of sides constituting the polygonal shape based on the captured image; Extracting a first intersection point corresponding to a boundary of the first object and a second intersection point corresponding to a boundary of the second object based on the plurality of trend lines, the first intersection point and the second intersection point being Corresponding to inflection points generated by projecting one side at a certain angle not perpendicular to the first object and the second object; And determining a distance between the first object and the second object based on the first intersection point and the second intersection point.

Projecting the polygonal leader lines to the first object and the second object may include projecting a leader line of different colors on each of the plurality of sides constituting the polygonal shape, Extracting a plurality of trend lines corresponding to the first side by identifying colors representing the first side in the different colors.

Wherein the step of determining the distance between the first object and the second object includes comparing the distance between the first intersection point and the second intersection point and the length of the side corresponding to the first side in the reference polygon, Determining a distance between the first object and the second object.

The measuring method may further include determining an imaging distance based on the lengths of the plurality of sides constituting the polygonal shape and the interior angles of the polygonal shape.

Wherein the step of determining the photographing distance includes determining a reference photographing distance at which the reference polygon is formed and a reference photographing distance at which at least one of the plurality of sides constituting the polygonal shape is formed when the inside angles of the polygonal- And determining the photographing distance based on a ratio between the lengths of at least one of the plurality of sides constituting the reference polygon.

The measuring method may further include determining an imaging angle based on the lengths of the plurality of sides constituting the polygonal shape and the interior angles of the polygonal shape.

Wherein the step of determining the photographing angle includes determining a ratio between a length of at least one of the plurality of sides constituting the polygonal shape and a length of at least one of a plurality of sides constituting the reference polygon, And a ratio between at least one of the internal angles of the reference polygon and at least one of the internal angles of the polygonal shape and the ratio between the lengths of the two sides facing each other in the rotation direction of the camera Step < / RTI >

According to another embodiment, the measuring method includes the steps of projecting a straight-line leader to the first object and the second object; Capturing the first object and the second object in a state in which the leader is projected onto the first object and the second object to obtain a captured image; Extracting a plurality of trend lines corresponding to the straight line shape based on the photographed image; Extracting a first intersection point corresponding to a boundary of the first object and a second intersection point corresponding to a boundary of the second object based on the plurality of trend lines, the first intersection point and the second intersection point being straight lines Corresponding to inflection points caused by projecting a shape at an angle that is not perpendicular to the first object and the second object; And determining a distance between the first object and the second object based on the first intersection and the second intersection.

According to another embodiment, the measuring method includes the steps of projecting a polygonal leader line onto an object; Capturing an image of the object in a state in which the polygonal leader line is projected on the object to obtain a captured image; Calculating first information representing at least one of the lengths of the plurality of sides constituting the polygonal shape and the interior angles of the polygonal shape based on the photographed image; Obtaining second information representing at least one of the lengths of the plurality of sides constituting the reference polygon and the internal angles of the reference polygon; And comparing at least one of the shooting distance and the shooting angle by comparing the first information and the second information.

According to one embodiment, the measuring apparatus includes a projection unit that projects a polygonal leader line to the first object and the second object; A camera for photographing the first object and the second object in a state in which the polygonal leader line is projected onto the first object and the second object to generate a photographed image; And extracting a plurality of trend lines corresponding to a first side of the plurality of sides constituting the polygonal shape on the basis of the photographed image, and based on the plurality of trend lines, And a second intersection point corresponding to a boundary of the second object, the first intersection point and the second intersection point being projected at a certain angle not perpendicular to the first object and the second object, And an image processing unit for determining a distance between the first object and the second object based on the first intersection point and the second intersection point.

According to the embodiments described below, spatial information can be accurately measured at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a measuring device using a leader according to an embodiment.
Fig. 2 is a view showing the projection angle of the leader line and the shape of the leader line according to the embodiment. Fig.
3 is a view showing a leader projected in a vertical direction with respect to an object;
Figures 4 and 5 are diagrams illustrating a leader line projected horizontally and a trend line based thereon according to one embodiment.
FIG. 6 illustrates a process of determining an imaging distance according to an exemplary embodiment; FIG.
7 is a diagram illustrating a process of measuring general relative space information.
8 and 9 are diagrams illustrating a process of determining an angle of view according to an embodiment.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. However, it is not intended to limit the embodiments according to the concepts of the present invention to the specific disclosure forms, but includes changes, equivalents, or alternatives falling within the spirit and scope of the present invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms " comprises ", or " having ", and the like, are used to specify one or more of the features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, 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. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

1 is a view showing a measuring apparatus using a leader according to an embodiment. Referring to FIG. 1, a measuring apparatus 100 according to an exemplary embodiment includes a projection unit 110, a camera 120, and an image processing unit 130.

The projection unit 110 can project a predetermined shape of the leader to the object. The constant shape may include various shapes such as a polygonal shape and a straight shape. The projection unit 110 may include a plurality of projection elements. Each projection element can project a laser so that a straight line-shaped leader line appears on the object. As a plurality of straight lines are projected on the object by the plurality of projection elements, a polygonal leader line may appear on the object.

The thickness, color, and projection angle of the line projected by each projection element can be adjusted independently for each projection element. For example, when a polygonal leader line is projected on an object, the length, thickness, color, and projection angle of each side of the polygonal shape can be adjusted to be different from each other. The projection unit 110 may be controlled through a control interface provided in the projection unit 110 or may be controlled according to an instruction from the image processing unit 130. [

The camera 120 can shoot an object in a state in which the leader line is projected on the object. The image processing unit 130 can acquire a photographed image photographed by the camera 120. A wired / wireless communication connection may be established between the camera 120 and the image processing unit 130, and a photographed image may be transmitted through the communication connection. The image processing unit 130 can measure spatial information through a leader line displayed on the photographed image.

The spatial information may include the distance between the objects, the shooting distance, and the shooting angle, and the shooting distance and the shooting angle may be referred to as relative space information because they represent relative information of the object and the camera.

The distance between the objects may mean the distance between the first object and the second object shown in FIG. For example, the first object may be a first surface, and the second object may be a second surface. In this case, the distance between the first object and the second object may correspond to the magnitude of the crack appearing between the first surface and the second surface.

The photographing distance represents the distance between the object and the camera 120, and the photographing angle represents an angle formed between the reference line and the camera 120. The photographing angle may be formed in a horizontal direction or in a vertical direction. For example, when the camera 120 rotates left and right, the photographing angle can be formed in the horizontal direction, and when the camera 120 rotates up and down, the photographing angle can be formed in the vertical direction.

The image processing unit 130 can extract the trend line from the leader line shown in the photographed image. The trend line is extracted from the leader line to represent the characteristics of the leader line including the position, direction, bend, and angle of the leader line, and can be used to analyze the leader line when measuring spatial information. The trend line extracted by the image processing unit 130 is shown in the processed image in Fig.

As described above, each leader may have a different color. For example, indicator lines of different colors may be projected on each of a plurality of sides constituting the polygonal shape. The image processing unit 130 can identify a specific leader among a plurality of leader lines through the color of the leader line of the polygonal shape and extract a trend line therefrom. For example, when the leader line corresponding to the first side of the polygonal shape is red, the image processing unit 130 identifies a leader line corresponding to the first side by identifying red among the different colors represented in the photographed image, The trend line can be extracted from the line.

The image processing unit 130 may control the projection unit 110. For example, the image processing unit 130 may provide a command to the projection unit 110 to adjust the length, thickness, color, and projection angle of the leader line. These commands can be generated based on user's control.

The image processing unit 130 can obtain information on the shape of the polygon having the standardized size and the internal angle from the polygon database constructed in advance and adjust the projection angle of the projection unit 110 to project the leader based on the information about the obtained polygonal shape. Can be controlled. These normalized polygons may be referred to below as reference polygons. The measuring apparatus can measure spatial information by comparing polygons and reference polygons photographed through photographed images.

2 is a view showing a projection angle of a leader according to an embodiment and a shape of a leader according to the projection angle. Fig. 2 (a) shows a case where a leader line is projected in a vertical direction with respect to an object to be projected, and Fig. 2 (b) shows a case where a projected leader line is projected at a certain angle? In FIG. 2 (a), it is difficult to recognize the boundary 210 of the object, but in FIG. 2 (b), the boundary 220 of the object can be clearly recognized. The case of FIG. 2 (a) will be described in more detail with reference to FIG.

3 is a diagram showing a leader projected in a vertical direction with respect to an object. 3 (a), the leader is projected in the vertical direction with respect to the object, and the captured image is obtained by the image capturing apparatus in this state. Fig. 3 (b) shows this state as viewed from above. In Fig. 3, since the leader line appears in a straight line shape, the boundary of the object can not be clearly recognized through the leader line. For example, since the leader line between the surface 1 and the surface 2 shows a linear shape, the boundary 310 of the surface 1 can not be clearly recognized in the photographed image, and the leader lines between the surface 2 and the surface 3 show a straight line, The boundary 320 of the surface 3 in the image can not be clearly recognized. The surface may correspond to the object described above.

The projection unit according to the embodiment can project the leader line at a predetermined angle, not perpendicular to the object, as shown in Fig. 2 (b). The case of FIG. 2 (b) will be described in more detail with reference to FIG. 3 and FIG.

FIGS. 4 and 5 are diagrams illustrating leader lines projected non-horizontally according to one embodiment and trend lines based thereon. Referring to Fig. 4, the leader is projected at a certain angle with respect to the object, not at a vertical angle, and the captured image is acquired by the image capturing device in this state. The leader lines shown in Fig. 4 can represent some of the polygonal leader lines, for example, the upper side and the lower side among the leader lines having a rectangular shape.

In Fig. 4, since the inflection points are generated in the leader line, the boundaries of the object can be clearly recognized. For example, since the inflection point 410 of the leader line appears between the surface 1 and the surface 2, the measuring apparatus can recognize the inflection point 410 on the photographed image to recognize the boundary of the surface 1. In addition, since the inflection point 420 of the leader line appears between the surface 2 and the surface 3, the measuring apparatus can recognize the boundary of the surface 3 by identifying the inflection point 420 in the photographed image.

The measuring device can detect points corresponding to these inflection points on the trend line. Referring to FIG. 5, trend lines extracted from the leader line and the leader line shown in the photographed image are shown. The measuring device can extract the trend line from the leader line. In Fig. 5, the leader line is composed of three lines, from which trend lines can be extracted. The measuring device can detect the intersection 515 of the trend lines corresponding to the inflection point 510 based on the extracted trend lines. The trend lines can be expressed as a first-order equation as shown in equation (1), or as a higher-order second-order equation. In Equation (1), a represents a slope, b represents a y-intercept, and i represents an index of a trendline.

The intersection points shown in Fig. 5 can be obtained arithmetically using the equation of the calculated trend line. The position of the interface between the surface 1 and the surface 3 in FIG. 4 can be accurately calculated using the calculated intersection point, and finally, the position in the image is converted into the actual distance value, The interval between the interfaces can be calculated. For example, the leader line shown in Fig. 5 may correspond to the first side which is one of the plurality of sides constituting the polygonal shape in the photographed image, and the trend lines shown in Fig. 5 may correspond to the first side. In FIG. 5, an intersection 515 among intersections of trend lines can be extracted. The intersection point 515 corresponds to the boundary of the surface 3 and can be expressed in two-dimensional coordinates. A similar process can determine the boundary of the surface 1 located on the opposite side of the surface 3, and the distance between the boundary of the surface 1 and the boundary of the surface 3 can be determined by the distance between the objects. Surface 1 may correspond to the first object described above, and surface 3 may correspond to the second object described above.

On the other hand, as described above, each leader may have a different color. The measuring apparatus can use the color of the leader line to be detected and the color match degree of the lines in the photographed image in order to detect the leader line in the photographed image.

In order to determine the distance between the objects, the actual distance corresponding to the image sensor or the unit pixel in the captured image may be used. If the actual distance corresponding to a unit pixel is known, the distance between the objects can be determined by multiplying the actual distance corresponding to a single pixel and the number of pixels present between the previously determined objects. When the actual distance corresponding to the unit pixel is not known, the reference object having a known length may be photographed with the objects, or a reference polygon whose size is known may be used. For example, if the actual distance corresponding to the length of each side is known in the reference polygon, the measuring device compares the distance between the first intersection point and the second intersection point, and the length of the side corresponding to the first side in the reference polygon, And the distance between the first object and the second object.

6 is a diagram illustrating a process of determining an imaging distance according to an exemplary embodiment. In Fig. 6 (a), the polygon 610 represents a reference polygon and can be photographed and stored in advance at the reference photographing distance L. [ 6 (b), the polygon 620 is photographed at the current photographing distance L '. According to the embodiment, the current photographing distance L 'can be measured by comparing the polygon 610 and the polygon 620. The length of the sides constituting the polygon 620 becomes longer as the current photographing distance L 'is distant from the state in which the photographing angle is maintained. Accordingly, a proportional relationship can be formed between the reference photographing distance L and the current photographing distance L ', and between the lengths of the sides constituting the polygon 610 and the lengths of the sides constituting the polygon 620.

In other words, when Equation (2) is established, the relationship according to Equation (3) can be established. In Equation (3), S represents a ratio between parameter values, and may be a constant constant.

Therefore, when the inner angles of the polygon 610 and the inner angles of the polygon 620 match, the measuring apparatus determines the reference photographing distance L at which the polygon 610 is formed, at least one of the plurality of sides constituting the polygon 610 The current shooting distance L 'can be determined based on the ratio S between the one length and the length of at least one of the plurality of sides constituting the polygon 620. [ For example, the measuring apparatus can determine the current photographing distance L 'by multiplying the reference photographing distance L by the ratio S when the ratio S is calculated.

Information about the polygon 620 below may be referred to as first information, and information about the polygon 610 may be referred to as second information, in this case based on a comparison of the first information and the second information It can be understood that the current shooting distance is determined.

7 is a diagram illustrating a process of measuring general relative spatial information. In the process of acquiring an image for distance measurement, the angle of shooting and the distance information between the object and the camera may have a great influence on the accuracy. In addition, if the photographing angle is accurately calculated and the appropriate correction coefficient is not applied, the reliability of the result can not be avoided.

In general, when a known pattern is used, relative space information including the shooting distance and the shooting angle can be measured. Previously known means that the measuring device knows the overall size of the pattern, the size of the elements making up the pattern, and the angle formed between the elements. The measuring apparatus can acquire the photographed images at the positions 710 and 720, and measure the relative spatial information by comparing the photographed images with a known pattern in advance. The aspect ratio and the inclination degree of the pattern in the photographed image can be used.

In this method, it may be inconvenient that a physical pattern such as a chess board must be prepared for measurement of relative spatial information. In addition, there may be error factors such as degree of attachment of the check board attached to the object, for example, flatness, verticality of the check board with respect to the distance measuring direction, check board output state, In addition, there may also be a problem of how the attached pattern can represent the position and orientation of the object.

As will be described below, embodiments can provide a measure to measure the angle of view without this physical pattern.

8 and 9 are diagrams illustrating a process of determining an angle of view according to an embodiment. According to one embodiment, after a reference line of a reference polygonal shape is photographed at a predetermined reference photographing angle as shown in FIG. 8 (a) The current shooting angle can be measured.

In Fig. 9A, the polygon 910 represents a reference polygon, which can be photographed and stored in advance at the reference photographing angle. For example, the reference photographing angle may be a horizontal angle with the ground. 9 (b), the polygon 920 is photographed at the current photographing angle?. 9 (b) shows that the current photographing angle? Is formed in the vertical direction, but the angle formed in the horizontal direction can also be measured in the same way.

The current photographing angle? Can be measured through comparison of the polygon 910 and the polygon 920. When the current photographing angle? Is changed while the photographing distance is maintained, the sides of the polygon 920 and the interior angles of the polygon 920 can be changed according to a certain rule. Specifically, the current photographing angle? And the ratio between the internal angle of the polygon 910 and the internal angle of the polygon 920 and the current photographing angle? And the length of the sides constituting the polygon 910 and the polygon 920 A constant proportional relationship may be formed between the ratios of the lengths of the constituent sides. This can be expressed by Equations (4) to (7).

Therefore, the measuring apparatus can measure the current photographing angle? Using either Equation (4) or (5), and Equation (6) or Equation (7). In other words, the measurement apparatus can determine the photographing angle based on the lengths of the plurality of sides constituting the polygon 920 and the internal angles of the polygon 920, more specifically, among the plurality of sides constituting the polygon 910 (6) between at least one length and the length of at least one of the plurality of sides constituting the reference polygon (920), and the ratio of the length of at least one of the two sides facing each other in the rotation direction of the camera among the plurality of sides constituting the polygonal shape (4) or (5) between at least one of the internal angles of the polygon (920) and at least one of the internal angles of the polygon (920) and any of the internal angles of the polygon The angle can be determined. Information about the polygon 920 may be referred to as first information and information about the polygon 910 may be referred to as second information, in which case, based on the comparison of the first information and the second information, It can be understood that the angle is determined.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented as a computer-readable recording medium, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (13)

Projecting a polygonal leader line onto the first object and the second object;
Photographing the first object and the second object in a state in which the polygonal leader line is projected on the first object and the second object to obtain a captured image;
Extracting a plurality of trend lines corresponding to a first side of the plurality of sides constituting the polygonal shape based on the captured image;
Extracting a first intersection point corresponding to a boundary of the first object and a second intersection point corresponding to a boundary of the second object based on the plurality of trend lines, the first intersection point and the second intersection point being Corresponding to inflection points generated by projecting one side at a certain angle not perpendicular to the first object and the second object; And
Determining a distance between the first object and the second object based on the first intersection and the second intersection;
Lt; / RTI > The method according to claim 1,
Projecting the polygonal leader lines onto the first object and the second object,
Projecting an indicator line of different colors on each of the plurality of sides constituting the polygonal shape,
The step of extracting a plurality of trend lines corresponding to the first side
Identifying a color representing the first side in the different color, and extracting a plurality of trend lines corresponding to the first side;
How to measure. The method according to claim 1,
Wherein determining the distance between the first object and the second object comprises:
Determining a distance between the first object and the second object by comparing a distance between the first intersection point and the second intersection point and a length of a side corresponding to the first side in a reference polygon,
How to measure. The method according to claim 1,
Determining a photographing distance based on the length of the plurality of sides constituting the polygonal shape and the interior angles of the polygonal shape based on the photographing image after the step of acquiring the photographing image
≪ / RTI > 5. The method of claim 4,
The step of determining the shooting distance
The reference photographing distance at which the reference polygon is formed and the length of at least one of the plurality of sides constituting the polygonal shape and a plurality of the reference polygons constituting the reference polygon when the inside angles of the polygonal- And determining the imaging distance based on a ratio between the lengths of at least one of the sides of the imaging lens. The method according to claim 1,
Determining a photographing angle based on the lengths of the plurality of sides constituting the polygonal shape and the interior angles of the polygonal shape based on the photographing image after the step of acquiring the photographing image
≪ / RTI > The method according to claim 6,
The step of determining the photographing angle
A ratio between a length of at least one of the plurality of sides constituting the polygonal shape and a length of at least one of a plurality of sides constituting the reference polygon and a ratio of a length of at least one of the plurality of sides constituting the polygonal shape, And determining the angle of view based on a ratio between at least one of the interior angles of the reference polygon and at least one of the interior angles of the polygonal shape. Projecting a straight-line leader line onto the first object and the second object;
Capturing the first object and the second object in a state in which the leader is projected onto the first object and the second object to obtain a captured image;
Extracting a plurality of trend lines corresponding to the straight line shape based on the photographed image;
Extracting a first intersection point corresponding to a boundary of the first object and a second intersection point corresponding to a boundary of the second object based on the plurality of trend lines, the first intersection point and the second intersection point being straight lines Corresponding to inflection points caused by projecting a shape at an angle that is not perpendicular to the first object and the second object; And
Determining a distance between the first object and the second object based on the first intersection and the second intersection;
Lt; / RTI > Projecting a polygonal leader line onto an object;
Capturing an image of the object in a state in which the polygonal leader line is projected on the object to obtain a captured image;
Calculating first information representing at least one of the lengths of the plurality of sides constituting the polygonal shape and the interior angles of the polygonal shape based on the photographed image;
Obtaining second information representing at least one of the lengths of the plurality of sides constituting the reference polygon and the internal angles of the reference polygon; And
Comparing the first information and the second information to determine at least one of an imaging distance and an imaging angle
. ≪ / RTI > 10. The method of claim 9,
Wherein the step of determining at least one of the shooting distance and the shooting angle
The reference photographing distance at which the reference polygon is formed and the length of at least one of the plurality of sides constituting the polygonal shape and a plurality of the reference polygons constituting the reference polygon when the inside angles of the polygonal- And determining the imaging distance based on a ratio between the lengths of at least one of the sides of the imaging lens. 10. The method of claim 9,
Wherein the step of determining at least one of the shooting distance and the shooting angle
A ratio between at least one of the internal angles of the polygonal shape and at least one of internal angles of the reference polygon, at least one of the plurality of sides constituting the polygonal shape, and at least one of a plurality of sides constituting the reference polygon Determining a photographing angle based on at least one of a ratio between the lengths and a ratio of lengths of two sides of the plurality of sides constituting the polygonal shape in the direction of rotation of the camera. 12. A computer-readable storage medium having stored thereon one or more programs comprising instructions for performing the method of any one of claims 1-11. A projection unit for projecting a polygonal leader line onto the first object and the second object;
A camera for photographing the first object and the second object in a state in which the polygonal leader line is projected onto the first object and the second object to generate a photographed image; And
Extracting a plurality of trend lines corresponding to a first side of a plurality of sides constituting the polygonal shape on the basis of the photographed image and extracting a first intersection point corresponding to a boundary of the first object and a second intersection point corresponding to a boundary of the first object based on the plurality of trend lines Wherein the first intersection point and the second intersection point are generated by projecting the first side at a certain angle not perpendicular to the first object and the second object, - determining a distance between the first object and the second object based on the first intersection point and the second intersection point,
.

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