JP2018116022A - Dimension measurement system, server for dimension measurement system, and dimension measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a system configuration and image processing, and to calculate an error between a dimension of an object portion and a design dimension with high accuracy.SOLUTION: A dimension measurement system comprises: an imaging part disposed at a predetermined position for imaging a work disposed at a reference position from a predetermined imaging direction; and a server for acquiring an imaging result by the imaging part via an electric communication line, and for calculating a dimension of an object portion as a part of the work on the basis of the acquired imaging result and information on the imaging position and the imaging direction, and for calculating an error between the calculated dimension of the object portion and a design dimension of the object portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dimension measurement system, a server for the dimension measurement system, and a dimension measurement method.

  A measuring apparatus for measuring a three-dimensional shape of an object is known (see, for example, Patent Document 1). The measurement apparatus described in Patent Literature 1 includes a camera that captures an image of an object and a guide member that guides the camera in one direction. This measuring apparatus calculates a three-dimensional shape of an object by imaging the object at a plurality of imaging positions while moving the camera along the guide member and superimposing the imaging results.

JP 7-78252 A

  However, since the measuring apparatus described in Patent Document 1 requires a guide mechanism for moving the camera, the apparatus configuration becomes complicated. In addition, since it is necessary to perform processing for superimposing the imaging results captured at a plurality of imaging positions, the image processing becomes complicated.

  The present invention has been made in view of the above, and can simplify the system configuration and image processing, and can calculate an error between the dimension of the target portion and the design dimension with high accuracy. It is an object to provide a measurement system, a server for a dimension measurement system, and a dimension measurement method.

  The dimension measuring system according to the present invention includes an imaging unit that is arranged at a predetermined imaging position and that captures an imaging target portion of a workpiece arranged at a reference position from a predetermined imaging direction that can be grasped by an outline, and an electric communication line. And obtaining a difference between the acquired imaging result and the design drawing of the workpiece when viewed from the imaging position and the imaging direction, and the difference is within a predetermined range. A server that calculates a size of the imaging target portion of the workpiece based on the imaging result and the design drawing of the workpiece, and calculates an error between the calculation result and the design size of the target portion.

  According to the present invention, a guide mechanism for moving the imaging unit is provided in order that the imaging unit arranged at a predetermined imaging position captures the workpiece from a predetermined imaging direction in which an imaging target portion of the workpiece can be grasped by an outline. There is no need. For this reason, the system configuration can be simplified. On the other hand, in the server, the dimensions of the target part that is a part of the work are calculated based on the imaging results captured from the predetermined imaging direction by the imaging unit arranged at the predetermined imaging position, and the calculated dimensions of the target part are calculated. Therefore, the process of superimposing the imaging results is not necessary, and the error between the dimensions of the target portion and the design dimensions can be calculated with high accuracy. In addition, the server calculates the difference between the imaging result and the work design diagram when viewed from the imaging position and imaging direction, and calculates the error when the difference is within a predetermined range. It can be evaluated that it is manufactured with a difference within a predetermined range with respect to the figure.

  In the above dimension measurement system, one imaging unit may be arranged.

  According to the present invention, since there is one imaging unit, it is possible to calculate the error between the size of the target portion and the design size with high accuracy while simplifying the system configuration.

  In the dimension measurement system, the imaging unit is a camera having a resolution in which the number of pixels in the first direction is 3840 pixels or more and the number of pixels in the second direction orthogonal to the first direction is 2160 pixels or more. Also good.

  According to the present invention, since the imaging unit has a resolution such that the number of pixels in the first direction is 3840 pixels or more and the number of pixels in the second direction orthogonal to the first direction is 2160 pixels or more, a highly accurate imaging result Is obtained.

  In the dimension measurement system, the imaging result includes images of a plurality of indices different from the workpiece, and the server is configured to capture the imaging position and the imaging direction of the imaging unit based on the images of the plurality of indices. The information regarding may be calculated.

  According to the present invention, in order to calculate information on the imaging position and the imaging direction based on images of a plurality of indices different from the workpiece, an error between the size of the target portion and the design size can be calculated with high accuracy. Can do.

  In the dimension measurement system, the server may correct the imaging result using information related to imaging characteristics of the imaging unit.

  According to the present invention, since the imaging result is appropriately corrected by the server, an error between the dimension of the target portion and the design dimension can be calculated with high accuracy.

  The server for the dimension measurement system according to the present invention is arranged at a predetermined imaging position, and an image is captured by an imaging unit that captures an imaging target portion of the work placed at the reference position from a predetermined imaging direction that can be grasped by an outline. The difference between the communication unit that acquires the result via the telecommunication line, the acquired imaging result and the design drawing of the workpiece when viewed from the imaging position and the imaging direction is calculated, and the difference is within a predetermined range. A calculation unit that calculates the dimension of the imaging target portion of the workpiece based on the imaging result and the design drawing of the workpiece when it is within, and calculates an error between the calculation result and the design dimension of the target portion; Is provided.

  According to the present invention, the size of the target portion that is a part of the workpiece is calculated based on the imaging result captured from the predetermined imaging direction by the imaging unit disposed at the predetermined imaging position, and the calculated size of the target portion is calculated. Therefore, the process of superimposing the imaging results is not necessary, and the error between the dimensions of the target portion and the design dimensions can be calculated with high accuracy. In addition, since the difference between the imaging position and the imaging direction of the workpiece when viewed from the imaging direction is calculated and the difference is within the predetermined range, the error is calculated. It can be evaluated that it is manufactured with the difference.

  According to the dimension measuring method of the present invention, an imaging target portion of a work placed at a predetermined imaging position and captured at a reference position is imaged from a predetermined imaging direction that can be grasped by an outline, and via a telecommunication line. Acquiring the imaging result of the imaging unit, calculating the difference between the acquired imaging result and the design drawing of the workpiece when viewed from the imaging position and the imaging direction, and the difference is predetermined. Calculating the size of the imaging target portion of the workpiece based on the imaging result and the design drawing of the workpiece when within the range, and calculating an error between the calculation result and the design size of the target portion And including.

  According to the present invention, since the imaging unit arranged at a predetermined imaging position images a workpiece from a predetermined imaging direction, there is no need to provide a guide mechanism for moving the imaging unit. For this reason, the system configuration can be simplified. On the other hand, in the server, the dimensions of the target part that is a part of the work are calculated based on the imaging results captured from the predetermined imaging direction by the imaging unit arranged at the predetermined imaging position, and the calculated dimensions of the target part are calculated. Therefore, the process of superimposing the imaging results is not necessary, and the error between the dimensions of the target portion and the design dimensions can be calculated with high accuracy. In addition, since the difference between the imaging position and the imaging direction of the workpiece when viewed from the imaging direction is calculated and the difference is within the predetermined range, the error is calculated. It can be evaluated that it is manufactured with the difference.

  According to the present invention, the error between the dimension of the target portion and the design dimension can be calculated with high accuracy.

FIG. 1 is a diagram illustrating an example of a dimension measurement system according to the present embodiment. FIG. 2 is a plan view showing an example of a workpiece. FIG. 3 is a side view showing an aspect of imaging a workpiece by the imaging unit. FIG. 4 is a perspective view illustrating an aspect in which a workpiece is imaged by the imaging unit. FIG. 5 is a block diagram illustrating an example of a server. FIG. 6 is a flowchart showing the operation of the imaging unit and server of the dimension measurement system. FIG. 7 is a diagram illustrating an example of a captured image that is an imaging result. FIG. 8 is a diagram schematically illustrating an example of processing for calculating a difference between a captured image and a design drawing. FIG. 9 is a diagram illustrating an example of a corrected image after the trapezoidal correction of the captured image. FIG. 10 is a diagram illustrating an example of the extracted image. FIG. 11 is a diagram illustrating a modification example in which a workpiece is imaged by the imaging unit. FIG. 12 is a diagram illustrating an example of a captured image that is the imaging result of the index member. FIG. 13 is a diagram illustrating an example of an imaging result correction process according to the modification. FIG. 14 is a diagram illustrating an example of an imaging result correction process according to the modification. FIG. 15 is a diagram illustrating an example of an imaging result correction process according to the modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dimension measuring system, a server for a dimension measuring system, and a dimension measuring method according to the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a diagram illustrating an example of a dimension measurement system SYS according to the present embodiment. As shown in FIG. 1, the dimension measuring system SYS measures the dimension of the workpiece W (see FIG. 2 and the like). The dimension measurement system SYS includes an imaging unit 10 and a server 30. The imaging unit 10 and the server 30 are connected via the network 20. The network 20 may be a wired or wireless telecommunication line. As the network 20, for example, a network such as the Internet may be used, or a dedicated telecommunication line between the imaging unit 10 and the server 30 may be used. In the dimension measurement system SYS, the place where the imaging unit 10 is provided may be different from the place where the server 30 is provided. For example, in the dimension measurement system SYS, the imaging unit 10 and the server 30 may be arranged in different regions or different countries.

  FIG. 2 is a plan view showing an example of the workpiece W. As shown in FIG. In the present embodiment, the workpiece W will be described by taking a pillar member constituting a building such as a building as an example. The workpiece W has, for example, a quadrangular prism shape. The workpiece W has an insertion hole Wa on at least one side surface. In the insertion hole Wa, a beam member of a building is inserted. The workpiece W has one end surface in the longitudinal direction serving as a reference surface Wb.

  FIG. 3 is a side view showing an aspect of imaging the workpiece W by the imaging unit 10. FIG. 4 is a perspective view showing an aspect in which the imaging unit 10 images the workpiece W. As shown in FIGS. 3 and 4, the imaging unit 10 has a fixed imaging position and imaging direction. The imaging unit 10 is fixed, for example, at a position where the imaging position is at a height H from the floor surface FL of a factory or the like. Further, the imaging unit 10 is fixed so that the axial direction (imaging direction) of the optical axis AX can grasp the imaging target portion of the workpiece W by the outline. In the present embodiment, the imaging target portion is, for example, the insertion hole Wa of the workpiece W, but is not limited thereto. The imaging unit 10 is fixed, for example, in a direction in which the imaging direction forms an angle α with the normal line of the floor surface FL. The imaging unit 10 may have at least one of the viewing angle β and the zoom magnification fixed. In the imaging unit 10, an angle γ (see FIG. 2) formed by the optical axis AX and a straight line from the imaging unit 10 toward the side portion We of the insertion hole Wa is set to a predetermined value in plan view. For example, one imaging unit 10 is arranged. In the present embodiment, the imaging unit 10 has a resolution such that the number of pixels in the first direction is 3840 pixels or more and the number of pixels in the second direction orthogonal to the first direction is 2160 pixels or more. The imaging unit 10 is not limited to a configuration in which the imaging direction is fixed, and may be configured to change the imaging direction by providing a so-called swing mechanism or the like.

  The workpiece W is disposed at the reference position P of the floor surface FL. The reference position P is set to a position where the imaging unit 10 can capture an image. For example, the reference position P is a position on the axis of the optical axis AX of the imaging unit 10. Further, the reference position P is set to a position at which, for example, almost the entire work W can be imaged by the imaging unit 10. The workpiece W is brought into contact with the positioning member 11. The positioning member 11 is brought into contact with the end face in the longitudinal direction and the end face in the short direction of the workpiece W, respectively. The positioning member 11 is provided with, for example, a touch sensor 11a that detects that the workpiece W is in contact. The touch sensor 11a may not be provided.

  FIG. 4 is a perspective view showing an example of the workpiece W. As shown in FIG. In the present embodiment, the workpiece W will be described by taking a pillar member constituting a building such as a building as an example. The workpiece W has, for example, a quadrangular prism shape. The workpiece W has an insertion hole Wa on at least one side surface. In the insertion hole Wa, a beam member of a building is inserted. The workpiece W has one end surface in the longitudinal direction serving as a reference surface Wb.

  FIG. 5 is a block diagram illustrating an example of the server 30. As illustrated in FIG. 5, the server 30 includes an input unit 31, an output unit 32, a communication unit 33, a control unit 34, and a storage unit 35. The input unit 31, the output unit 32, the communication unit 33, the control unit 34, and the storage unit 35 are connected by, for example, a bus line 36 or the like.

  The input unit 31 outputs an instruction signal for the control unit 34. As the input unit 31, for example, an input device such as a keyboard, a mouse, or a touch panel is used. In addition to the touch panel or instead of the touch panel, a button, lever, dial, switch, or other input device may be used as the input unit 31. The input unit 31 outputs an operation signal for operating the imaging unit 10, for example. The output unit 32 outputs various information including characters and images. As the output unit 32, for example, an image display unit such as a liquid crystal panel, or an audio output unit such as a speaker or a buzzer is used.

  The communication unit 33 communicates information with the imaging unit 10 via the network 20. For example, the communication unit 33 transmits an operation signal to the imaging unit 10 via the network 20. The communication unit 33 receives an imaging result from the imaging unit 10 via the network 20, for example.

  The control unit 34 controls each unit of the input unit 31, the output unit 32, and the communication unit 33. Further, the control unit 34 controls the operation of the imaging unit 10 via the network 20. The control unit 34 includes a processing device such as a CPU (Central Processing Unit), and a storage device such as a RAM (Random Access Memory) and a ROM (Read Only Memory).

  The control unit 34 includes an image processing unit 41 and a calculation unit 42. The image processing unit 41 processes the imaging result obtained by the imaging unit 10 according to various programs and data stored in the storage unit 35. The calculation unit 42 performs various calculation processes according to various programs and data stored in the storage unit 35.

  The storage unit 35 has a storage such as a hard disk drive or a solid state drive. Note that an external storage medium such as a removable disk may be used as the storage unit 35. The storage unit 35 is a program for controlling the operation system of the server 30, the operations of the input unit 31, the output unit 32, and the communication unit 33, and performing various processes and calculations in the image processing unit 41 and the calculation unit 42. And data and the like are stored.

  The storage unit 35 includes a design data storage unit 51, an imaging characteristic storage unit 52, an imaging result storage unit 53, and an imaging condition storage unit 54. The design data storage unit 51 stores design data of the workpiece W. The design data includes, for example, design drawing data of the work W and design dimension data for each part of the work W. The design drawing data includes three-dimensional shape data of the workpiece W. As the design drawing data, two-dimensional shape data regarding the side surface of the workpiece W may be included. The design dimension data includes, for example, design dimension data of the insertion hole Wa. The imaging characteristic storage unit 52 stores imaging characteristics obtained by the imaging unit 10. Examples of the imaging characteristics include distortion and expansion / contraction of an image captured by the imaging unit 10. The imaging result storage unit 53 stores the imaging result obtained by the imaging unit 10. The imaging condition storage unit 54 stores imaging conditions by the imaging unit 10. Examples of imaging conditions include the imaging position and imaging direction of the imaging unit 10.

  Next, the dimension measuring method according to this embodiment will be described. In the dimension measuring method according to the present embodiment, the dimension of the workpiece W is measured using the dimension measuring system SYS described above. FIG. 6 is a flowchart showing the operations of the imaging unit 10 and the server 30 of the dimension measurement system SYS. The flowchart on the left side of FIG. 6 shows the operation of the imaging unit 10. The flowchart on the right side of FIG. 6 shows the operation of the server 30.

  First, an operation for imaging the workpiece W will be described. When imaging the workpiece W, the workpiece W to be measured is arranged at the reference position P. For example, the workpiece W is positioned by bringing the reference surface Wb of the workpiece W into contact with the positioning member 11. For example, a sensor, a camera, or the like may be separately arranged to check whether or not the reference surface Wb is in contact with the positioning member 11.

  Next, the workpiece W is imaged by the imaging unit 10 (step S10). In step S <b> 10, for example, an operator who operates the server 30 inputs an operation signal for operating the imaging unit 10 through the input unit 31. The operation signal includes an imaging start signal for starting imaging. The control unit 34 causes the communication unit 33 to transmit an operation signal to the imaging unit 10 via the network 20. The imaging unit 10 captures the workpiece W by receiving the operation signal.

  FIG. 7 is a diagram illustrating an example of a captured image I1 that is an imaging result. The captured image I1 includes a work image W1 that is an image of the work W. The workpiece image W1 includes an insertion hole image W1a that is an image of the insertion hole Wa and a reference surface image W1b that is a part of the reference surface Wb. Further, the workpiece image W1 has a dimension (width) in a short direction that becomes narrower as the distance from the imaging unit 10 increases in the longitudinal direction due to imaging characteristics of the imaging unit 10. Further, when the workpiece W is imaged by the imaging unit 10, since a shadow is formed inside the insertion hole Wa, the captured image I1 is shown with a black edge portion of the insertion hole image W1a.

  Next, the imaging unit 10 transmits a captured image I1 that is an imaging result to the server 30 (step S20). In step S20, the imaging unit 10 transmits the captured image I1 to the server 30 via the network 20 by a communication unit (not illustrated). Thereafter, the imaging unit 10 determines whether or not the imaging process has been completed for all the workpieces W to be measured (step S30). In step S30, the imaging unit 10 detects, for example, whether or not an operation signal for performing new imaging has been received. If no operation signal is detected, the imaging unit 10 determines that the imaging process has been completed (Yes in step S30). ). In this case, the imaging unit 10 ends the operation. Further, when an operation signal is detected from the server 30, the imaging unit 10 determines that the imaging process is not completed (No in step S30). In this case, the imaging unit 10 places a new workpiece W at the reference position P, and repeats the operations after step S10.

  On the other hand, in the server 30, the control unit 34 detects whether or not the communication unit 33 has received the captured image I1 from the imaging unit 10 (step S110). When the communication unit 33 has not detected the captured image I1 (No in Step S110), the control unit 34 repeatedly performs the detection in Step S110. When the communication unit 33 receives the captured image I1 (Yes in step S110), the control unit 34 determines the difference between the captured image I1 and the design drawing of the work W when viewed from the imaging position and imaging direction of the imaging unit 10. Is calculated (step S120).

  FIG. 8 is a diagram schematically illustrating an example of a process for calculating a difference between a captured image that is an imaging result and a design drawing. In step S <b> 120, first, the control unit 34 stores the captured image I <b> 1 that is the imaging result received by the communication unit 33 in the imaging result storage unit 53 of the storage unit 35. Next, the image processing unit 41 extracts an outline image of the workpiece W based on the captured image I1. The image processing unit 41 extracts the outline image Ia using, for example, a program for extracting the outline. A program for extracting an outline can be stored in the storage unit 53 in advance. Further, the image processing unit 41 creates a design drawing image Ib of the workpiece W when viewed from the same imaging position and imaging direction as the imaging unit 10 based on the design drawing data stored in the design data storage unit 51. . Then, the image processing unit 41 creates an overlapping image Ic obtained by superimposing the outline image Ia extracted from the captured image I1 and the design drawing image Ib created based on the design drawing data. The computing unit 42 calculates a difference between the outline image Ia and the design drawing data Ib based on the created overlapping image Ic.

  Next, the control unit 34 determines whether or not the difference calculated by the calculation unit 42 is within a predetermined range (step S130). When the difference exceeds the predetermined range (No in step S130), the control unit 34 ends the process. When the difference is within the predetermined range (Yes in step S130), the control unit 34 calculates a dimensional error with the design data in the measurement target portion of the workpiece W based on the imaging result (step S140). In step S <b> 140, first, the control unit 34 stores the imaging result received by the communication unit 33 in the imaging result storage unit 53 of the storage unit 35. FIG. 8 is a diagram illustrating an example of a captured image I1 that is an imaging result. The captured image I1 includes a work image W1 that is an image of the work W. The workpiece image W1 includes an insertion hole image W1a that is an image of the insertion hole Wa and a reference surface image W1b that is a part of the reference surface Wb. Further, the workpiece image W1 has a dimension (width) in a short direction that becomes narrower as the distance from the imaging unit 10 increases in the longitudinal direction due to imaging characteristics of the imaging unit 10. Further, when the workpiece W is imaged by the imaging unit 10, since a shadow is formed inside the insertion hole Wa, the captured image I1 is shown with a black edge portion of the insertion hole image W1a.

  After the captured image I1 is stored in the imaging result storage unit 53, the image processing unit 41 performs image processing on the captured image I1. For example, the image processing unit 41 recognizes the shape of the work image W1 by performing image analysis of the captured image I1. In this case, the image processing unit 41 extracts the insertion hole image W1a from the work image W1 by comparing, for example, the brightness of the insertion hole image W1a and the work image W1 and extracting a portion having a low lightness as a feature point. It is possible.

  Thereafter, the image processing unit 41 corrects distortion, expansion and contraction, and the like included in the imaging result using the imaging characteristic data stored in the imaging characteristic storage unit 52. The image processing unit 41 can perform keystone correction, for example. FIG. 9 is a diagram illustrating an example of the corrected image I2 after the trapezoidal correction of the captured image I1. In the corrected image I2, the work image W1 and the insertion hole image W1a are trapezoidally corrected, and the work image W2 has the same width in the longitudinal direction. As shown in FIG. 9, in the present embodiment, the corrected image I2 corrects the work image W2 as a three-dimensional shape, but the present invention is not limited to this. For example, the image processing unit 41 may extract a two-dimensional shape of the side surface of the workpiece W where the insertion hole Wa is formed based on the captured image I1. The control unit 34 stores the generated corrected image I2 in the imaging result storage unit 53.

  After the corrected image I2 is stored in the imaging result storage unit 53, the image processing unit 41 compares the corrected image I2 with the design drawing data stored in the design data storage unit 51, thereby measuring the measurement target portion. The dimension of the insertion hole Wa is calculated. In this case, for example, the image processing unit 41 performs matching between the workpiece image W2 and the insertion hole image W2a and the three-dimensional shape data of the workpiece W, and calculates the dimension of the insertion hole Wa based on the matching result. The image processing unit 41 sets the three-dimensional shape data of the workpiece W according to the imaging conditions of the imaging unit 10 based on the imaging position, imaging direction, and zoom magnification of the imaging unit 10.

  When performing the matching process, the image processing unit 41 extracts the insertion hole image W2a and the surrounding image of the insertion hole image W2a from the corrected image I2, and the extracted part is more matched than the other parts. Differences may be made in the accuracy of the matching process, such as performing the process with high accuracy.

  FIG. 10 is a diagram illustrating an example of an extracted image (hereinafter referred to as an extracted image) I3. As illustrated in FIG. 10, the extracted image I3 includes the insertion hole image W3a, the insertion hole image W3a of the work image W3, and a surrounding portion. In FIG. 10, in order to make it easy to discriminate the extracted image I3, a portion corresponding to the extracted image I3 in the corrected image I2 is indicated by a solid line, and a portion different from the extracted image I3 is indicated by a one-dot chain line. As described above, the size of the insertion hole Wa can be efficiently calculated by making a difference in matching accuracy between the portion corresponding to the extracted image I3 and the other portion of the corrected image I2.

  After calculating the dimension of the insertion hole Wa, the calculation unit 42 compares the calculation result with the design dimension data of the insertion hole Wa stored in the design data storage unit 51, thereby calculating an error in the dimension of the insertion hole Wa. calculate. In step S140, as described above, the error between the insertion hole Wa of the workpiece W and the design dimension is calculated.

  After calculating the error of the insertion hole Wa, the control unit 34 stores the calculation result in the storage unit 35 (step S150). In step S150, for example, the control unit 34 may identify the workpiece W in advance and store the workpiece W in association with the identified workpiece W. Thereafter, the control unit 34 determines whether or not the imaging process has been completed for all the workpieces W to be measured (step S160). In step S160, the control unit 34 detects, for example, whether or not an operation signal for performing new imaging is input. If no operation signal is detected, the control unit 34 determines that the imaging process has been completed (Yes in step S160). ). In this case, the control unit 34 ends the operation. Further, when an operation signal from the input unit 31 is detected, the control unit 34 determines that the imaging process has not been completed (No in step S160). In this case, the control unit 34 repeatedly performs the operations after step S110.

  As described above, the dimension measurement system SYS according to the present embodiment includes a guide mechanism that moves the imaging unit 10 in order that the imaging unit 10 arranged at a predetermined imaging position images the workpiece W from a predetermined imaging direction. There is no need. For this reason, the system configuration can be simplified. On the other hand, the server 30 calculates and calculates the size of the insertion hole Wa, which is a target portion that is a part of the workpiece W, based on the captured image I1 captured by the imaging unit 10 arranged at a predetermined imaging position. Since the error between the dimension of the insertion hole Wa and the design dimension of the target portion is calculated, it is not necessary to superimpose the captured image I1, and the error between the dimension of the insertion hole Wa and the design dimension is highly accurate. Can be calculated.

  Since the dimension measuring system SYS according to the present embodiment has one imaging unit 10, it is possible to calculate the error between the dimension of the target portion and the design dimension with high accuracy while simplifying the system configuration.

  In the dimension measurement system SYS according to the present embodiment, the imaging unit 10 has a resolution in which the number of pixels in the first direction is 3840 pixels or more and the number of pixels in the second direction orthogonal to the first direction is 2160 pixels or more. Highly accurate imaging results can be obtained.

  In the dimension measurement system SYS according to the present embodiment, since the server 30 corrects the captured image I1 using information regarding the imaging characteristics of the imaging unit 10, the server 30 corrects the captured image I1 appropriately. Thereby, the error between the dimension of the target portion and the design dimension can be calculated with high accuracy.

  The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the imaging conditions such as the imaging position and the imaging direction of the imaging unit 10 are stored in the imaging condition storage unit 54, and a three-dimensional shape is generated from the design drawing of the workpiece W using the imaging conditions. Although described as an example, the present invention is not limited to this.

  FIG. 11 is a diagram illustrating a modified example in which the workpiece W is imaged by the imaging unit 10. As shown in FIG. 11, a plurality of index members 12 are arranged in the vicinity of the reference position P, and the index member 12 is imaged when the imaging unit 10 images the workpiece W or before imaging the workpiece W. May be. In this case, the plurality of index members 12 are fixed at a reference position, for example, a position determined with respect to the positioning member 11. The design drawing data and design dimension data of each index member 12 and the relative position of each index member 12 with respect to the positioning member 11 are stored in the storage unit 35 of the server 30. Then, the imaging result obtained by imaging the plurality of index members 12 is transmitted to the server 30 via the network 20.

  FIG. 12 is a diagram illustrating an example of the captured image I4 that is the imaging result of the index member 12. As shown in FIG. 12, the captured image I4 includes an index member image 12a that is an image of a plurality of index members 12. In FIG. 12, a work image W4 that is an image of the work W and an insertion hole image W4a that is an image of the insertion hole Wa are indicated by a one-dot chain line.

  In this case, the server 30 captures the imaging position and the imaging direction of the imaging unit 10 based on the captured image I4, the design drawing data and design dimension data of the plurality of index members 12, and the relative positions of the plurality of index members 12. Can be calculated. For example, the control unit 34 recognizes the shape of each index member image 12a captured in the captured image I4, performs trapezoidal correction on the captured image I4, and corrects the index member image 12a after correction using each value of the imaging condition as a parameter. The imaging conditions can be calculated by comparing the design drawing data.

  As described above, since the imaging conditions regarding the imaging position and the imaging direction are calculated based on the images of the plurality of index members 12 different from the workpiece W, the error between the dimension of the target portion and the design dimension is calculated with high accuracy. can do.

  Further, in the above embodiment, the imaging unit 10 has an example of a configuration having a resolution in which the number of pixels in the first direction is 3840 pixels or more and the number of pixels in the second direction orthogonal to the first direction is 2160 pixels or more. However, the present invention is not limited to this. For example, the number of pixels in the first direction of the imaging unit 10 may be less than 3840 pixels, and the number of pixels in the second direction may be less than 2160 pixels.

  Moreover, in the said embodiment, although demonstrated taking the example of the structure by which the one imaging part 10 is arrange | positioned, it is not limited to this. For example, a configuration in which a plurality of imaging units 10 are arranged may be used. In this case, the imaging position and the imaging direction are fixed for each of the plurality of imaging units 10. And in the server 30, each of the imaging result by the some imaging part 10 is processed independently, and the error between the dimension of a target part and a design dimension is calculated. Further, even when the imaging target portion of the workpiece W exceeds the imaging range of one imaging unit 10, a plurality of imaging units 10 may be used.

In the above embodiment, the case where correction such as trapezoid correction is performed on the captured image I1 has been described as an example, but the present invention is not limited to this. FIG. 13 to FIG. 15 are diagrams illustrating an example of the correction process of the imaging result according to the modification. For example, as shown in FIG. 13, a grid R set at equal intervals is imaged over the entire area captured by the imaging unit 10. Next, for example, the reference image Ir1 in which the grid R as shown in FIG. 14 is arranged uniformly is compared with the imaging result.
For example, as illustrated in FIG. 15, in the captured image Ir2 that is the imaging result, when the image is captured in a state where a part of the intersection Ra of the lattice R is deviated, the calculation unit 42 calculates the intersection Ra The distortion of the imaging unit 10 is calculated based on the coordinates and the shift amount. In this case, for the portion between the intersection points of the lattice, the calculation unit 42 may perform correction processing of the captured image I1 based on the calculation result when the deviation amount of the intersection point is linearly changed. .

DESCRIPTION OF SYMBOLS 10 Imaging part 11 Positioning member 12 Index member 12a Index member image 20 Network 30 Server 31 Input part 32 Output part 33 Communication part 34 Control part 35 Storage part 36 Bus line 41 Image processing part 42 Calculation part 51 Design data storage part 52 Imaging characteristic Storage unit 53 Imaging result storage unit 54 Imaging condition storage unit α Angle AX Optical axis FL Floor I1, I4 Captured image I2 Corrected image I3 Image, extracted image P Reference position SYS Dimension measurement system W Work W1, W2, W3, W4 Work image Wa Insertion hole Wb Reference surface W1a, W2a, W3a, W4a Insertion hole image W1b Reference surface image

Claims (7)

An imaging unit that is arranged at a predetermined imaging position and that captures an imaging target portion of a workpiece arranged at a reference position from a predetermined imaging direction that can be grasped by an outline;
The imaging result in the imaging unit is acquired via a telecommunication line, and the difference between the acquired imaging result and the design drawing of the workpiece when viewed from the imaging position and the imaging direction is extracted. A server that calculates a size of the imaging target portion of the workpiece based on the imaging result and the design drawing of the workpiece when within a predetermined range, and calculates an error between the calculation result and the design size of the target portion; ,
A dimension measurement system comprising:   The dimension measuring system according to claim 1, wherein one imaging unit is arranged.   3. The camera according to claim 1, wherein the imaging unit is a camera having a resolution such that the number of pixels in the first direction is 3840 pixels or more and the number of pixels in the second direction orthogonal to the first direction is 2160 pixels or more. The dimension measurement system described. The imaging result includes images of a plurality of indices different from the workpiece,
The dimension measurement system according to any one of claims 1 to 3, wherein the server calculates information related to the imaging position and the imaging direction of the imaging unit based on a plurality of images of the index.   The dimension measurement system according to any one of claims 1 to 4, wherein the server corrects the imaging result using information related to imaging characteristics of the imaging unit. Communication that acquires an imaging result at an imaging unit that is arranged at a predetermined imaging position and that captures an imaging target portion of a workpiece arranged at a reference position from a predetermined imaging direction that can be grasped by an outline, via an electric communication line And
The difference between the acquired imaging result and the design drawing of the workpiece when viewed from the imaging position and the imaging direction is extracted, and when the difference is within a predetermined range, the imaging result and the design drawing of the workpiece; A calculation unit that calculates a size of the imaging target portion of the workpiece based on the calculation result and calculates an error between the calculation result and the design size of the target portion;
A server for a dimension measurement system comprising: Imaging at a predetermined imaging position and imaging from a predetermined imaging direction in which an imaging target portion of a workpiece arranged at a reference position can be grasped by an outline;
Obtaining an imaging result at the imaging unit via a telecommunication line;
Extracting the difference between the acquired imaging result and the design drawing of the workpiece when viewed from the imaging position and the imaging direction;
Calculating the size of the imaging target portion of the workpiece based on the imaging result and the design drawing of the workpiece when the difference is within a predetermined range;
Calculating an error between the calculation result and the design dimension of the target portion;
Dimension measurement method including

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