KR101923373B1 - Method for 3d-scanning a subject using a calibration object - Google Patents

Abstract

The present invention provides a method for automatically reconfiguring a 3D model of an object and calibrating an error by using a turntable type 3D scanning system. A method for providing a 3D scanning object measurement service using a calibration object comprises the following steps of: interlocking and connecting with a 3D scanner; inputting and storing a specification of a calibration object located on a base surface of the connected 3D scanner; executing 3D scan of a subject which is located on the calibration object and executes the 3D scan together with the calibration object; generating the 3D model as a result of the 3D scan, and re-adjusting a coordinate of the subject by using the specification of the calibration body in order to calibration the error of the generated 3D model; and calibrating the 3D model by using the re-adjusted coordinate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a 3D scanning object measurement service using a correction object,

The present invention relates to a method of providing an object measurement service using a 3D scanner, wherein a 3D model is generated by a 3D scan after locating a subject on an already known correction object, and then a measurement error or a distortion of the object Provides a way to calibrate.

The digital 3D model represents the actual object shape as numerical 3D data. Today, the application field of the 3D model is very wide. Moreover, due to the improvement of the performance of the 3D graphic device and the decrease of the price of the calculation device such as a computer, The industry is growing more and more. The 3D models of body and industrial products are also used in fashion design, design and development of production products, and marketing industries, and can also be applied to fields such as architectural design and reverse engineering.

At this time, a method of obtaining a 3D model is performed by using a 3D sensor. In this regard, Korean Patent Laid-Open Publication No. 2016-0105598 (published on Sep. 07, 2016) discloses a technique for objectively diagnosing a body type diagnosis using a 3D sensor and a scientific approach as a body type disease diagnosis platform, A 3D sensor is provided on the upper part of the column and a turntable is provided apart from the column in order to compare and diagnose the disease, When the 3D sensor is operated, the turntable is rotated in one direction through the control unit, and the beam of the 3D sensor is irradiated to the whole body to perform three-dimensional body measurement.

However, in order to construct 3D shape information using 3D scanning, it takes many steps from the shooting of the measured object to the synthesis of the acquired data. This requires a lot of time, complicated and cumbersome manual work, and the calibration of the scanner itself Errors and distortions occur when combining data scanned from multiple angles or incomplete.

An embodiment of the present invention provides a method of automatically reconstructing and correcting an error of a 3D model of an object using a turntable type 3D scanning system and photographing a correction object already known with the object together with the object, , The coordinates of each point constituting the object of error are corrected and reconstructed into a 3D model by facet representation using accurate 3D point cluster data and this can be easily converted to the STL format It can be easily integrated with CAD software and 3D printing processor. It can be used not only as a turntable scanner but also as a single or multiple scanner system that moves along a trajectory without a turntable, a single scanner system in a fixed location, Provides 3D scanning object measurement service, which can be applied to scanner structure Method can be provided. It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to another aspect of the present invention, there is provided a 3D scanner comprising: a base (a turntable surface of a turntable system or a base floor when there is no turntable; A step of inputting and storing the specification of the correction object on the correction object, performing a predetermined 3D scan with the object to be subjected to 3D scanning on the correction object, and generating a 3D model as a result of the 3D scanning Correcting the coordinates of the subject using the specification of the correction object to remove errors of the generated 3D model, and correcting the 3D model using the re-adjusted coordinates.

According to any one of the above-mentioned objects of the present invention, it is possible to minimize the difference in data quality caused by the skill of the operator by automating unnecessary preparatory processes or manual elements according to progress steps, which are complicated and time- As a result, it is possible to prevent the occurrence of the data caused by the operator's mistake in advance. As a result, it is possible to increase the time, data efficiency and shape accuracy of the 3D data acquisition process through the 3D scanner, And it is possible to correct errors by a simple method even for various kinds of scanners.

1 is a block diagram illustrating a system for providing a 3D scanning object measurement service using a correction object according to an exemplary embodiment of the present invention.
2 is a view for explaining the operation of a turntable type 3D scanner according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of generating 3D models and generating XY coordinates of a correction object among 3D scanning object measurement services using the correction object shown in FIG.
4 is a view for explaining an embodiment for correcting an error in a 3D model of a subject using the correction tool of FIG.
5 and 6 are views for explaining an embodiment of a scanner to which an object measurement service according to an embodiment of the present invention is applied.
7 is a flowchart illustrating a method of providing a 3D scanning object measurement service using a correction object according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are used in their numerical value or in close proximity to their numerical values when the manufacturing and material tolerances inherent in the stated meanings are presented, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "does not mean" step for. &Quot;

In this specification, the term " part " includes a unit realized by hardware, a unit realized by software, and a unit realized by using both. Further, one unit may be implemented using two or more hardware, or two or more units may be implemented by one hardware.

In this specification, some of the operations or functions described as being performed by a terminal, a device, or a device may be performed instead in a server connected to the terminal, device, or device. Likewise, some of the operations or functions described as being performed by the server may also be performed in a terminal, device or device connected to the server.

In this specification, some of the operations or functions described in the mapping or matching with the terminal are used for mapping or matching the unique number of the terminal or the identification information of the individual, which is the identification data of the terminal . ≪ / RTI >

In this specification, at least one meaning may be interpreted as singular or plural, and when using at least one term, it may be deleted in duplicate below, Can be interpreted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a system for providing a 3D scanning object measurement service using a correction object according to an exemplary embodiment of the present invention. Referring to FIG. 1, a 3D scanning object measurement service providing system 1 using a correction object may include a turntable 3D scanner 100 and a user terminal 300. However, the 3D scanning object measurement service providing system 1 using the correction object of FIG. 1 is only an embodiment of the present invention, and thus the present invention is not limited to FIG.

At this time, the respective components of FIG. 1 are generally connected through a network 200. For example, as shown in FIG. 1, a turntable-type 3D scanner 100 may be connected to a user terminal 300 through a network 200. In addition, the user terminal 300 may be connected to the turntable 3D scanner 100 through the network 200.

Here, the network 200 refers to a connection structure capable of exchanging information between nodes such as a plurality of terminals and servers. An example of such a network 200 is RF, 3rd Generation Partnership Project (3GPP) Network, an LTE (Long Term Evolution) network, a 5rd Generation Partnership Project (5 GPP) network, a World Interoperability for Microwave Access (WIMAX) network, the Internet, a LAN (Local Area Network) Wired communication such as USB to a Wide Area Network (WAN), a Personal Area Network (PAN), a Bluetooth network, an NFC network, a satellite broadcasting network, an analog broadcasting network, a DMB (Digital Multimedia Broadcasting) network, But is not limited to.

The turntable 3D scanner 100 may be a device that scans and photographs a subject and transmits data to the user terminal 300. [ At this time, if the computing resources of the 3D scanner 100 satisfy predetermined conditions, the user terminal 300 may not be provided and may be integrally implemented. Accordingly, it is not essential that the turntable type 3D scanner 100 and the user terminal 300 are separately implemented, but it can be variously embodied according to networking resources and computing resources. The turntable 3D scanner 100 may be a device that scans the subject 130 together with the correction unit 120 to generate a 3D model. The turntable 3D scanner 100 may be a device for providing data such as a scan result to the user terminal 300 so that the user terminal 300 corrects the error of the subject 130 through the correction unit 120 . Here, the turntable 3D scanner 100 may be an apparatus that rotates the turntable 110 to photograph the subject 130 and the corrector 120 at 360 degrees, or may be a device in which a single scanner or a plurality of scanners move along a trajectory without a turntable And may be a device for performing a scan or a fixed number of scanners for scanning, or a plurality of scanners located in various directions for scanning.

The user terminal 300 may be a terminal connected to the turntable type 3D scanner 100 and generating and outputting a 3D model using the result of photographing the subject 130 and the correction object 120. [ The user terminal 300 is a terminal for performing a correction operation for eliminating the phenomenon (error generation) that the subject 130 can not be formed as a 3D model as it is by using the information output from the turntable type 3D scanner 100 . For this, the user terminal 300 may be a terminal that corrects the correction using the specification of the correction body 120. [

Here, the user terminal 300 may be implemented as a computer capable of connecting to a remote server or terminal through the network 200. [ Here, the computer may include, for example, an IPTV, a set-top box, a notebook equipped with a web browser (Web browser), a desktop, a laptop, and the like. At this time, the user terminal 300 may be implemented as a terminal capable of connecting to a remote server or terminal through the network 200. [ The user terminal 300 is a wireless communication device that is guaranteed to be portable and mobility, for example, a personal communication system (PCS), a global system for mobile communications (GSM), a personal digital cellular (PDC) ), A PDA (Personal Digital Assistant), IMT (International Mobile Telecommunication) -2000, Code Division Multiple Access (CDMA) -2000, W-CDMA (W-Code Division Multiple Access), Wibro (Wireless Broadband Internet) based wireless communication device, such as a smartphone, a smartpad, a tablet PC, and the like.

FIG. 2 is a view for explaining the operation of the turntable-type 3D scanner according to the embodiment of the present invention. FIG. 3 is a view for explaining the operation of the 3D scanning object measurement service using the correction object shown in FIG. FIG. 4 is a view for explaining an embodiment for correcting an error in a 3D model of a subject using the correction tool of FIG. 1, and FIGS. 5 and 6 Is a view for explaining an embodiment of a scanner to which an object measurement service according to an embodiment of the present invention is applied.

Referring to FIG. 2, the block configuration of the user terminal 300 of FIG. 1 will be described together. 1, a user terminal 300 according to an exemplary embodiment of the present invention includes a connection unit 310, a storage unit 320, an implementation unit 330, an adjustment unit 340, a correction unit 350, . ≪ / RTI >

A server (not shown) or another server (not shown) operating in conjunction with a server according to an embodiment of the present invention may send a 3D scanning object measurement service application, a program, an app page, Pages, etc., the turntable user terminal 300 may install or open a 3D scanning object measurement service application, a program, an app page, a web page, etc. using the correction object. Also, a service program may be executed in the user terminal 300 using a script executed in a web browser. Here, a web browser is a program that enables a WWW (World Wide Web) service, and is a program for receiving and displaying hypertext described in hypertext mark-up language (HTML), for example, Netscape (Netscape) An Explorer, chrome, and the like. Further, the application refers to an application on the terminal, for example, an app (app) running on a mobile terminal (smart phone).

At this time, the connection of the network 200 means that a communication object is created at the communication contact for communication with the turntable 3D scanner 100 and the user terminal 300 connected to the network 200. The user terminal 300 may exchange data with each other through a communication object.

Hereinafter, the concept of 3D scanning will be described with reference to FIG. 2, and a block diagram of FIG. 1 will be described, which describes the configuration of the user terminal 100. FIG.

Referring to FIG. 2, scanning refers to a process of obtaining a 3D model of an object in a fully automatic or semiautomatic manner by geometric shape of the object. Generally, scanned data is referred to as point cloud data because each scanned point data has one position coordinate value in three-dimensional space.

The 3D scanning system can be classified according to the method of scanning. The optical method uses the photographic principle, the ultrasonic method uses the ultrasonic wave for scanning, the x-ray method using the RTG radiation, and the laser method using the triangulation principle , Structured light and TOF (Time of Flight).

Trigonometry uses a method that can calculate the distance from the baseline to one point if you know the position of both end points of the base line. (a), it is a typical laser-vision device system that can use trigonometry in the form of using one laser projector and one camera. The laser projector injects a laser line onto the surface of the object to scan the object. At this time, a laser stripe formed on the surface of the object is obtained by the camera. Each point of the laser band corresponds to each pixel on the image screen.

At this time, the distance d from the reference line to the target point by the trigonometrical method can be easily obtained as shown in Equation (1) by knowing the angle between the length l of the reference line and the angle?

[Equation 1]

d = lsin? sin? / sin (? +?)

Thus, all point cloud data for the surface of the scanned object can be collected.

A 3D model of the scanned object can be reconstructed using the 3D point cluster data. The reconstructed 3D model can then be output to a 3D printer or used for various other purposes.

In addition, the turntable 3D scanner 100 according to an embodiment of the present invention may be composed of three modules as a laser projector, a camera, and a turntable 110 as shown in (b). However, the present invention is not limited to the following examples. Here, the laser projector is used to scan a laser beam on the surface of an object to be scanned, and the camera module may include a GigE (Gigabit Ethernet) high-speed camera having a focal lens and a CMOS image sensor. At this time, the pixel size of the CMOS image sensor is 1312 x 1082 pixels, and gray image can be provided, and the GigE camera can transmit the image at a high speed up to 135 frames per second at the distance of the LAN cable of about 100m. The turntable 110 rotates the object to be scanned by 360 degrees so as to form 3D point cluster data on the entire surface of the object. The point cluster data formed by the laser bands can be transmitted to the user terminal 300 through the LAN card every time the rotation mechanism rotates at a certain angle.

The object measurement service according to one embodiment of the present invention will be described with reference to a block diagram of FIG. 1, FIG. 3, and FIG. 4 using a turntable 3D scanner 100 driven by the above-described configuration and operation .

The connection unit 310 can be linked with the turntable 3D scanner 100 in a linkable manner.

The storage unit 320 can input and store specifications of the correction unit 120 on the turntable 110 (base surface) of the connected turntable type 3D scanner 100. At this time, the specification may be a result of measuring the correction member 120 including at least one of length, width, height, width, thickness, and diameter.

The implementing unit 330 may be configured to perform a 3D scanning of the subject 130 located on the correcting member 120 with the turntable 110 (base surface) of the turntable 3D scanner 100 and the correcting unit 120 A 3D scan can be performed with a predetermined number of turns.

The adjustment unit 340 may re-adjust the coordinates of the subject 130 using the specification of the correction object 120 to generate a 3D model as a result of the 3D scan and remove the error of the generated 3D model.

3, the adjustment unit 340 generates a 3D model as a result of the 3D scan and uses the specification of the correction object 120 to remove the error of the generated 3D model, (B) the plane of the turntable 110 is set to 0, the direction perpendicular to the base plane is defined as the Z-axis, and the height of the subject 130 is adjusted using the height of the correcting member 120, The coordinates in the Z-axis direction of all points constituting the coordinate system can be readjusted.

The adjusting unit 340 removes the turntable 110 from the 3D model created by the scan and removes the base surface from the model to obtain the front, back, seat, (D) sets the measured height (thickness on the 3D model of the correction body) of the 3D model from the upper surface (base surface) of the turntable 110 of the formed 3D model to the upper surface of the correction body as tm And (e) ignoring the Z coordinate of the correcting body 120, the equation of the straight line on the X, Y plane corresponding to the recognized left, right, front, and back sides can be generated.

4, assuming that the correction unit 120 is a rectangular parallelepiped having a length (Lengh), a width (Width), and a height (Thickness) When recalculating the XYZ coordinates for all points, it can be recalculated with the following conditions.

That is, (b) a point on the left side of p, which is a point where a straight line that forms the front and rear surfaces of the correcting body 120 meets a straight line passing p, which is a point on the subject 130 in a predetermined direction, is L, Is set to R, the distance from p to p is defined as pL, and the distance from R to L is set as RL.

(C) a point on the rear side of p, which is a point where a straight line that forms the left and right sides of the correcting member 120 meets a straight line passing p, which is a point on the subject 130 in a predetermined direction, Is set to F, the distance from p to p is set to pB, and the distance from F to B is set to FB.

If L is located on the right side of p, the sign of pL is set to a negative value. If B is located on the front side with respect to p, the sign of pB is set to a negative number. The error can be corrected.

&Quot; (2) "

x '= w * pL / RL

y '= l * pB / FB

z '= (z - tm) * t / tm

Here, tm means the height (measured on the 3D model) from the top surface of the turntable 110 (from the base surface) to the top surface of the correction body 120.

Then, the adjustment unit 340 can recalculate the XYZ coordinates with respect to all the points forming the subject 130, and the correction unit 350 can correct the 3D model using the re-adjusted coordinates.

A correction object 120, which is a calibration object, is used to correct a relative position value between an image plane and a laser plane coordinate system photographed by the turntable type 3D scanner 100 .

The width and length of the corrector 120 may be greater than the width and length of the subject 130.

In addition, the object measurement service according to an exemplary embodiment of the present invention includes a method of directly obtaining a relative position value between an image plane and a laser plane coordinate system using a calibration object Alternatively, the calibration object at this time may be a lattice patterned object.

Hereinafter, the 3D scanning object measurement service using the correction object having the above-described configuration can be used in any system for scanning a person or an object from a smart terminal as shown in FIGS. 5 and 6. FIG.

The method of providing the 3D scanning object measurement service using the correction objects of FIGS. 2 to 6 is the same as the description of the method of providing the 3D scanning object measurement service using the correction object as described above with reference to FIG. 1 The description will be omitted because it can be easily deduced from the description.

7 is a flowchart illustrating a method of providing a 3D scanning object measurement service using a correction object according to an exemplary embodiment of the present invention. Hereinafter, an example of a process in which data is transmitted and received between the respective components will be described with reference to FIG. 7. However, the present invention is not limited to such an embodiment, It is apparent to those skilled in the art that the process of transmitting and receiving data can be changed.

Referring to FIG. 7, the user terminal may interlock with the 3D scanner (S7100), and may input and store the specification of the correction object located on the base surface of the connected 3D scanner (S7200).

In addition, the user terminal performs a 3D scan on a subject positioned on the correction object and to perform a 3D scan (S7300), generates a 3D model as a result of the 3D scan, Coordinates of the subject can be readjusted using the spec of the congestion (S7400).

Finally, the user terminal corrects the 3D model using the re-adjusted coordinates (S7500).

The order between the above-described steps S7100 to S7500 is merely an example, but is not limited thereto. That is, the order between the above-described steps S7100 to S7500 may be mutually varied, and some of the steps may be executed or deleted at the same time.

The method of providing the 3D scanning object measurement service using the correction object of FIG. 7 is the same as the description of the method of providing the 3D scanning object measurement service using the correction object described above with reference to FIGS. 1 to 6 The description will be omitted because it can be easily deduced from the description.

The algorithm is summarized as follows. Place an object (subject) to be scanned on the base surface with the corrector already known in dimensions (for example, a rectangular parallelepiped with width w, length l, and thickness t). Make sure the width and length of the corrector is slightly larger than that of the subject. A 3D scan is performed to create a 3D model with a base surface, a correction object, and a subject together.

In the 3D model, the base plane is recognized, the direction perpendicular to the plane is defined as the z direction, and the z coordinate of the plane is set to zero to newly calculate the coordinates of all the points. Remove the base surface to isolate the subject in the corrected position. Recognize the left, right, front, rear, and top sides of the corrector. The measured height from the base surface on the 3D model to the top of the fixture is called tm. Separate the fixture and the object from the top of the fixture.

Ignores the z coordinates of the left, right, front, and back sides of the corrector, and finds the equation of the straight line on the x, y plane corresponding to each plane. Compute the x, y and z coordinates for all points p of the object as follows: Draw a hypothetical straight line passing through p in the direction defined by the straight lines corresponding to the front and back sides, and obtain the point at which it meets the straight line on the left side. Let L be the point that meets the straight line on the right side. The distance between p and L is called pL and the distance between R and L is called RL. If p is to the left of L, the sign of pL is negative. Draw a hypothetical straight line passing through p in the direction defined by the straight lines corresponding to the left and right sides. Find the point at which it meets the straight line at the back, Let the distance between p and B be pB and the distance between F and B be FB. If p is after B, the sign of pB is negative.

The new coordinates x ', y', z 'of the point p (x, y, z) are calculated as follows.

x '= w * pL / RL

y '= l * pB / FB

z '= (z - tm) * t / tm

The method of providing a 3D scanning object measurement service using a correction object according to an embodiment described with reference to FIG. 7 may be performed in the form of a recording medium including an application executed by a computer or a command executable by a computer such as a program module Can be implemented. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer readable medium may include both computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

The method of providing a 3D scanning object measurement service using a correction object according to an embodiment of the present invention may include an application installed in a terminal (which may include a program included in a platform or an operating system basically installed in the terminal) And may be executed by an application (that is, a program) directly installed on a master terminal by a user via an application providing server such as an application store server, an application, or a web server associated with the service. In this regard, the 3D scanning object measurement service providing method using the correction object according to an embodiment of the present invention is basically installed in a terminal or implemented as an application (i.e., a program) directly installed by a user, And can be recorded on a computer-readable recording medium.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (5)

A method of providing an object measurement service executed in a user terminal,
Linking with a 3D scanner;
Inputting and storing a specification of a correction object located on a base surface of the 3D scanner;
Performing a 3D scan on a subject positioned on the correction object and to be subjected to a 3D scan together with a base surface and a correction object of the 3D scanner;
Creating a 3D model as a result of the 3D scan, and re-adjusting the coordinates of the subject using the specification of the correction object to eliminate the error of the 3D model; And
Correcting the 3D model using the re-adjusted coordinates;
/ RTI >
Wherein the step of performing the 3D scanning includes placing the object having at least one known dimension on the base surface of the 3D scanner, placing the object on the object,
A method for providing a 3D scanning object measurement service using a correction object.
The method according to claim 1,
Wherein the step of rearranging coordinates constituting the subject comprises:
A direction perpendicular to the base surface of the 3D scanner is defined as a Z axis, a base surface of the 3D scanner is defined as a Z axis, and coordinates of all points forming the subject in the Z axis direction Wherein the step of reconstructing the 3D scanning object measurement service comprises the step of reconstructing the 3D scanning object measurement service using the correction object.
The method according to claim 1,
Wherein the specification is a result of measuring the calibration object including at least one of a length, a width, a height, a width, a thickness, and a diameter of the 3D scanning object.
The method according to claim 1,
Wherein the step of rearranging the coordinates of the object using the specification of the correction object comprises the steps of:
A step of recognizing the base surface in the 3D model, defining a direction perpendicular to the plane in the z direction, and calculating coordinates of the points forming the 3D model in accordance with the direction;
Removing the base surface and separating the object placed on the corrected position;
Recognizing the left, right, front, rear, and upper sides of the correction body;
Separating the correction object and the object based on the upper surface of the correction object;
Recalculating XYZ coordinates for all the points constituting the subject;
Wherein the 3D scanning object measurement service is executed by executing a calibration object.
5. The method of claim 4,
The corrector is a rectangular parallelepiped having a length (Lengh), a width (Width), and a height (Thickness) of 1, w and t, respectively. The measured height from the base surface on the generated 3D model to the upper surface Thickness on the model) is tm,
The step of recalculating the XYZ coordinates with respect to all the points constituting the subject includes:
Calculating the equations of a straight line on the x, y plane corresponding to each plane by ignoring the z coordinate of the left, right, front, and back sides of the correction body;
Draw a hypothetical straight line passing through p in the direction defined by the straight lines corresponding to the front side and the back side. Find a point where it meets the straight line on the left side, set it as L, The distance between R and L is called RL and the distance between R and L is called RL. if p is to the left of L, setting the sign of pL to a negative number;
Draw a hypothetical straight line passing through p in the direction defined by the straight lines corresponding to the left and right sides. Find the point at which it meets the straight line at the back and set it to B. Find the point that meets the front line and set it to F, Let B be the distance between B and PB, and the distance between F and B be FB. setting pB to a negative sign if p is after B;
A method of providing a 3D scanning object measurement service using a correction object which calculates new coordinates x ', y', z 'of each point p (x, y, z) constituting a subject as follows
x '= w * pL / RL
y '= l * pB / FB
z '= (z - tm) * t / tm

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