JP6624563B2 - Dimension measurement method - Google Patents

Description

  The present invention relates to a dimension measuring method.

  Conventionally, a rectangular parallelepiped accommodation room for accommodating an object to be measured such as a home delivery object, an imaging unit fixed to one vertex of an upper surface of the accommodation room, and image processing on the image of the object measured by the imaging unit. 2. Description of the Related Art A dimension measurement device including an image processing unit for performing the measurement is known (for example, see Patent Document 1).

JP 2006-119792 A

  In the dimension measurement device described in Patent Literature 1, when distortion occurs in an image captured by the imaging unit, it is difficult to accurately obtain the size of the measured object.

  SUMMARY OF THE INVENTION An object of the present invention, which has been invented in view of the above-mentioned conventional problems, is to provide a dimension measuring method capable of accurately obtaining the size of an object to be measured.

  In order to achieve the above object, a dimension measuring method according to one embodiment of the present invention has the following configuration.

  The dimension measuring device includes a storage chamber that accommodates an object to be measured in a removable manner, and an imaging unit that is provided in the accommodation chamber and captures an image of the object to be measured that is accommodated in the accommodation chamber. The dimension measuring device includes an image processing unit that performs image processing based on information on an image captured by the imaging unit and measures the size of the device under test.

The storage chamber has a rectangular lower surface on which the object to be measured is placed, a rectangular first side surface extending upward from the lower surface, and an upper extending from the lower surface, and A second side portion having a rectangular shape adjacent to the side portion. The accommodation room is provided with a first corner formed by the lower surface and the first side surface, a second corner formed by the lower surface and the second side surface, And a third corner formed by the second side surface. The accommodation room has a reference corner formed at a portion where the first entry corner, the second entry corner, and the third entry corner intersect, and serves as a reference point for arranging the device under test at a predetermined position. The storage chamber has a marker that indicates a position of a side of the first side surface, the second side surface, and the lower surface. The accommodation room has a first marker, a second marker, and a third marker as the markers. The first marker has a rectangular frame shape having a line along the third corner and a line parallel to the first corner on the first side surface portion. The second marker has a rectangular frame shape having a line along the third corner and a line parallel to the second corner on the second side surface. The third marker has a rectangular frame shape having a line along the first corner and a line parallel to the second corner on the lower surface.

  The image processing unit creates a binary image by performing binarization on the image captured by the imaging unit in a state before the object to be measured is arranged in the storage room. Identify the marker in the value image. The image processing unit identifies edges corresponding to the sides of the first side surface, the second side surface, and the bottom surface in the binary image from the marker, and corrects distortion based on the distortion of the edge. Create data for use. The image processing unit creates a binary image by performing binarization on the image captured by the imaging unit in a state where the object to be measured is arranged in the accommodation room. The image processing unit acquires a corrected image by correcting distortion of an edge of the device under test identified in the binary image based on the distortion correction data. The image processing unit may measure a size of the device under test by scanning an area corresponding to the first side surface, the second side surface, and the lower surface of the corrected image.

  According to the dimension measuring method of the present invention, since the distortion of the image captured by the imaging unit can be easily removed, the size of the measured object can be accurately measured.

FIG. 1 is a perspective view showing a dimension measuring device. FIG. 2 is a block diagram illustrating the imaging unit and the image processing unit. FIG. 3 is a flowchart of a correction mode of the dimension measuring method according to one embodiment of the present invention. FIG. 4 is an explanatory diagram showing a binary image captured by the imaging unit and binarized. FIG. 5 is an explanatory diagram showing a binary image corrected in the correction mode. FIG. 6A is an explanatory diagram illustrating a measurement image obtained by capturing an image of a state where an object to be measured is disposed in a storage room by an imaging unit. FIG. 6B is an explanatory diagram showing a binary image in a state where the object to be measured is arranged in the accommodation room. FIG. 7 is a flowchart of the size measuring mode of the dimension measuring method according to one embodiment of the present invention. FIG. 8A is a side view of a first side portion of the binary image of FIG. 6B. FIG. 8B is a plan view of the lower surface of the binary image of FIG. 6B. FIG. 8C is a plan view of the lower surface of the binary image of FIG. 6B. FIG. 9 is a flowchart showing another example of the correction mode of the dimension measuring method according to one embodiment of the present invention. FIG. 10 is an explanatory diagram of a state where the virtual line C obtained by translating the edge A3 is superimposed on the edge A6. FIG. 11A is a perspective view showing another example of the marker of the dimension measuring device. FIG. 11B is a perspective view showing another example of the marker of the dimension measuring device. FIG. 11C is a perspective view showing another example of the marker of the dimension measuring device.

<Embodiment>
One embodiment of the present invention described below particularly relates to a dimension measuring method in which a marker is provided in an accommodation room.

(Description of configuration)
Hereinafter, the dimension measuring method according to the present embodiment will be described with reference to FIGS.

  The dimension measuring device 1 measures the size of a measured object 50 such as a home delivery item. Here, the size of the DUT 50 is a dimension of the length, width, and height of the DUT 50. The shape of the device under test 50 is a cube or a rectangular parallelepiped.

  As shown in FIG. 1, the dimension measuring device 1 includes a storage chamber 11.

  The accommodation room 11 has an outer shell 111 that forms the outer shell of the dimension measuring device 1, and an inner space 112 that is formed inside the outer shell 111. The shape of the outer shell 111 is a rectangular parallelepiped. The outer body 111 has a lower wall portion 20, a side wall portion 21, and an upper wall portion 25. Here, an entrance 261 is formed in the side wall 21 of the outer body 111, which is an opening through which the device under test 50 is inserted into and removed from the internal space 112.

  In the dimension measuring device 1 of the present embodiment, the side where the entrance 261 is provided is defined as a front F, and the opposite side is defined as a rear B. Then, the right R and the left L are defined based on the time when the user stands toward the entrance 261 of the dimension measuring device 1. Here, the vertical dimension of the DUT 50 is the front-back dimension of the DUT 50. The horizontal dimension of the device under test 50 is the horizontal dimension of the device under test 50. The dimension of the height of the DUT 50 is the vertical dimension of the DUT 50.

  The lower wall portion 20 is formed in a rectangular shape when viewed from below. The surface on the inner space 112 side (upper side) of the lower wall portion 20 is the lower surface portion 201. The device under test 50 is placed on the lower surface 201.

  The side wall 21 has a right wall 22, a left wall 23, and a rear wall 24. The right wall 22 extends upward from the right end of the lower wall 20. The left wall 23 extends upward from the left end of the lower wall 20. The rear wall 24 extends upward from the rear end of the lower wall 20.

  The right wall portion 22 is formed in a rectangular shape when viewed from the right. In the right wall portion 22, a surface on the side of the internal space 112 (left side) is referred to as a right surface portion 221. The left wall portion 23 is formed in a rectangular shape when viewed from the left. In the left wall portion 23, a surface on the side of the internal space 112 (right side) is referred to as a left surface portion 231. The rear wall portion 24 is formed in a rectangular shape when viewed from behind. In the rear wall portion 24, a surface on the side of the internal space 112 (front side) is referred to as a rear surface portion 241.

  The upper wall 25 is connected to the upper edge of the right wall 22, the upper edge of the left wall 23, and the upper edge of the rear wall 24. The upper wall portion 25 is formed in a rectangular shape when viewed from above. In the upper wall portion 25, the surface on the inner space 112 side (lower side) is referred to as an upper surface portion 251.

  The outer shell 111 has a rectangular parallelepiped shape opened to the front F, and the opening to the front F is defined as an entrance 261. The outer body 111 is provided with a door that opens and closes the entrance 261. The door is attached to the front end of the right wall 22 and rotates about the front end of the right wall 22 as a shaft 262. The door, when closed, is formed in a rectangular shape when viewed from the front. In addition, the door forms the front wall 26 of the outer body 111 in the closed state. In the door, the surface on the inner space 112 side (rear side) is referred to as a front surface portion 263.

  The internal space 112 of the accommodation room 11 is formed by being surrounded by the lower surface portion 201, the right surface portion 221, the left surface portion 231, the rear surface portion 241, the upper surface portion 251 and the front surface portion 263. The internal space 112 is formed in a rectangular parallelepiped shape. In the following description, the rear surface portion 241 is described as a first side surface portion 242, and the left surface portion 231 is described as a second side surface portion 232.

  The outer body 111 has a first insertion corner 12 formed at a portion where the lower surface portion 201 and the first side surface portion 242 intersect. The outer body 111 has a second insertion corner 13 formed at a portion where the lower surface portion 201 and the second side surface portion 232 intersect. The outer body 111 has a third insertion corner 14 formed at a portion where the first side surface portion 242 and the second side surface portion 232 intersect. In the outer shell 111, a portion where the first corner 12, the second corner 13, and the third corner 14 intersect is referred to as a reference corner 15.

  In the accommodation room 11, a reference point serving as a reference for arranging the device under test 50 at a predetermined position is set in the reference corner 15.

  In the accommodation room 11, the DUT 50 placed in accordance with the reference corner 15 contacts the lower surface portion 201, the first side surface portion 242, and the second side surface portion 232, and thereby the vertical position, the horizontal position, and the height. Positioning is performed. The position of the measured object 50 becomes a predetermined position of the measured object 50.

  As shown in FIG. 1, a marker 16 is provided on the inner surface of the accommodation room 11. The marker 16 is provided on the first side 242, the second side 232, and the lower surface 201. The marker 16 provided on the first side surface 242 is referred to as a first marker 161, the marker 16 provided on the second side surface 232 is referred to as a second marker 162, and the marker 16 provided on the lower surface 201 is referred to as a third marker 163.

  The marker 16 has a rectangular frame shape. In the first side surface portion 242, a line is drawn along the third corner 14 of the first marker 161, and a line parallel to the first corner 12 is drawn from each of the upper end and the lower end thereof. A line connecting the right edge is drawn.

  In the second side surface portion 232, a line is drawn along the third corner 14 of the second marker 162, and a line parallel to the second corner 13 is drawn from each of the upper end and the lower end thereof. A line connecting the front ends is drawn.

  In the lower surface portion 201, a line is drawn along the first corner 12 of the third marker 163, and a line parallel to the second corner 13 is drawn from each of the left end and the right end thereof, and the front end of each line is drawn. The line connecting is drawn.

  Although the first marker 161, the second marker 162, and the third marker 163 of the present embodiment have the same color tone, it is preferable that each color tone is different. Here, the color tone means a color tone such as lightness and saturation of the color.

  As shown in FIG. 1, the imaging unit 3 is installed in the accommodation room 11 of the dimension measuring device 1. The imaging unit 3 is arranged at a position where the entire inside of the accommodation room 11 can be imaged. In the dimension measuring device 1 of the present embodiment, the imaging unit 3 is installed at a corner formed by the upper surface 251, the right surface 221, and the front surface 263, which is a diagonal of the reference corner 15.

  The imaging unit 3 includes a camera body 31 and a lighting device 32.

  As the camera body 31, a camera capable of capturing an image of the entire inside of the accommodation room 11 is used. In particular, a camera capable of imaging the entirety of the DUT 50, the lower surface 201, the first side surface 242, and the second side surface 232 is used for the camera body 31. As the camera body 31, a CCD (Charge-Coupled Device) camera is used. In the camera body 31, a wide-angle lens is used so that the entire inside of the accommodation room 11 can be easily photographed.

  The lighting fixture 32 is electrically connected to a control unit of the camera body 31. The lighting fixture 32 brightens the inside of the accommodation room 11. In particular, the lighting fixture 32 attaches the DUT 50, the first corner 12, the second corner 13, the third corner 14, the first marker 161, the second marker 162, and the third marker 163 to the camera body 31. Used for clear imaging. As the lighting device 32, a white LED (Light Emitting Diode) is used.

  The dimension measuring device 1 has an image processing unit 4 as shown in FIG. The image processing unit 4 includes a microcomputer. The microcomputer has a CPU (Central Processing Unit), a memory, and the like. The microcomputer controls the CPU by executing a program stored in the memory.

  The image processing unit 4 performs image processing on the image captured by the imaging unit 3. Further, the image processing section 4 has a correction mode 41 having a program for correcting an image of the device under test 50 stored in the memory.

  The image processing unit 4 causes the imaging unit 3 to image the lower surface part 201, the first side surface part 242, the second side surface part 232, and the marker 16 in a state before the object to be measured is arranged in the accommodation room 11, and the original image is taken. Get an image. The correction mode 41 shown in FIG. 3 is started in step S1 based on the original image.

  In the correction mode 41, in step S2, noise removal is performed on the original image (grayscale image). Then, a filtering process is performed based on the luminance value which is one of the information of the image from which the noise has been removed.

  In the correction mode 41, an edge is detected by performing binarization on the image on which the filter processing has been performed in step S3. An image on which such processing has been performed is referred to as a binary image 42 (see FIG. 4). The binary image 42 is a two-dimensional image. The data of the binary image 42 is stored in the memory of the image processing unit 4.

  In the correction mode 41, in step S4, the marker 16 in the binary image 42 is identified by pattern matching based on the information on the shape and luminance value of the marker 16 acquired in advance.

  In the correction mode 41, the first side surface portion 242, the second side surface portion 232, and the lower surface portion 201 in the binary image 42 are determined from the first marker 161, the second marker 162, and the third marker 163 identified in step S5. Identify the edge. Here, in the correction mode 41, edges A1 to A9 in the binary image 42 are identified.

  In the correction mode 41, in step 6, an internal parameter including an optical axis center coordinate, a focal length, a lens distortion coefficient, and the like, which associates the coordinates of the binary image 42 before distortion correction with the binary image 42 after distortion correction, is set. adjust. As the internal parameters, for example, the positions of the intersections of the checkerboard patterns in the captured image of the checkerboard with a known grid size are detected, and the internal parameters are calculated so that the intervals between the intersections are equal. In the correction mode, in step 6, the internal parameters determined in advance are used for the accommodation room 11 whose size is already known, and further adjusted so as to be optimal for the accommodation room 11. In this case, the internal parameter is distortion correction data.

  In the correction mode 41, in step S7, the distortion of the edges A1 to A9 is corrected using the internal parameters, and the edges A1 to A9 are linearized, thereby acquiring the corrected binary image 42 illustrated in FIG. In the present embodiment, a known method using an internal parameter (for example, JP-A-2015-35685) is used as a method of the correction mode 41, but another known method (for example, JP-A-2011-25428 described later). ) May be used.

  Next, in the correction mode 41, the lower surface 201, the first side surface 242, the second side surface 232, the marker 16, and the target object 50 are placed in a predetermined position of the accommodation chamber 11 in step S8. An image for measurement is obtained by causing the imaging unit 3 to image the measurement object 50. Then, the correction mode 41 obtains a binary image 42 as shown in FIG. 6A by performing noise removal, filtering, and binarization on the measurement image.

  6B, in the correction mode 41, the distortions of the edges A1 to A9 and the edges T1 to T8 of the device under test 50 are corrected using internal parameters (distortion correction data), as shown in FIG. 6B.

  In this manner, the correction mode 41 acquires the corrected image 44 shown in FIG. 6B in which the edges A1 to A9 and the edges T1 to T8 in the measurement image are corrected.

  Next, the image processing unit 4 performs image processing on the binary image 42 corrected in the correction mode 41, and performs a size measurement mode 43 for measuring the size of the DUT 50 shown in FIG.

  The size measurement mode 43 performs the projection transformation process using the homogeneous coordinates in step S8, and thereby the first side surface portion 242 of the corrected binary image 42 in which the device 50 is arranged shown in FIG. 6B. A side view (see FIG. 8A) as viewed from the oblique right front is obtained. Further, in the size measurement mode 43, a first plan view (see FIG. 8B) in which the lower surface portion 201 of the corrected binary image 42 is viewed from above, and a second plan view in which the lower surface portion 201 of the corrected binary image 42 is viewed from above. A plan view (see FIG. 8C) is obtained.

  In the size measurement mode 43, in step S13, pixels arranged along the length direction of the edge A3 in the side view are scanned. At this time, as shown in FIG. 8A, a first variation H1 which is a difference between a length based on the number of pixels from the edge A9 to the edge T8 and a length based on the number of pixels from the edge A9 to the edge A2 is obtained.

  The size measurement mode 43 also scans pixels arranged along the length direction of the edge A2 in the first plan view. At this time, as shown in FIG. 8B, a second variation H2, which is a difference between the length based on the number of pixels from the edge A5 to the edge T5 and the length based on the number of pixels from the edge A5 to the edge A1, is obtained.

  The size measurement mode 43 scans pixels arranged along the length direction of the edge A1 in the second plan view. At this time, as shown in FIG. 8C, a third variation H3, which is a difference between the length based on the number of pixels from the edge A4 to the edge T4 and the length based on the number of pixels from the edge A4 to the edge A2, is obtained.

  In the size measurement mode 43, in Step S14 shown in FIG. 7, the ratio of the length based on the number of pixels of the edge A3 in the corrected binary image 42 shown in FIG. The height of the measured object 50 is obtained based on the one change amount H1. Similarly, the vertical length of the DUT 50 is determined based on the second variation H2, and the horizontal length of the DUT 50 is determined based on the third variation H3.

  As another example of the correction mode 41, there is a distortion correction method shown in FIG.

  In the correction mode 41, steps S16 to S20 are the same as steps S1 to S5 described above, and a description thereof will be omitted.

  In the correction mode 41, in step S21, the edges A1 to A9 are compared with the straight lines corresponding to the edges A1 to A9, and the distortion amount Y with respect to the straight lines is obtained. For example, the amount of distortion Y is obtained by superimposing a virtual line C, which is a straight line, on the edge A6 (see FIG. 10). In the correction mode 41, in step S22, a correction coefficient K that makes the edge A6 a straight line is obtained based on the distortion amount Y. The correction mode 41 performs the same for the other edges, and obtains the respective correction coefficients K.

  In the correction mode 41, in step S23, the distortion of the edges A1 to A9 is corrected from the respective correction coefficients K, and the edges A1 to A9 are linearized to obtain the corrected binary image 42 illustrated in FIG. 6B. . In this case, the correction coefficient K becomes distortion correction data.

  The edges A1, A2, and A3 among the edges identified by the image processing unit 4 are straight lines that are hardly distorted even when the imaging unit 3 captures images using a wide-angle lens. The distortion amount Y may be obtained by using this.

  Next, in the correction mode 41, the lower surface 201, the first side surface 242, the second side surface 232, the marker 16, and the target object 50 are arranged in a predetermined position of the accommodation chamber 11 in step S24. By causing the imaging unit 3 to image the measurement object 50, the measurement image illustrated in FIG. 6A is acquired.

  The correction mode 41 corrects the distortion of the edges A1 to A9 and the edges T1 to T8 of the device under test 50 by using the correction coefficient K (distortion correction data) in step 25, as shown in FIG. 6B.

  The edges A1 to A9 are corrected by the corresponding correction coefficients K. The correction coefficient K of the edge T1 is determined, for example, as a proportional relation between the positional relationship of the edge T1 with respect to the edges A3 and A6, and the correction coefficient K of the edge A3 and the correction coefficient K of the edge A6. Then, for the other edges T2 to T8, similarly, the correction coefficient K is determined based on the positional relationship with respect to two of the edges A1 to A9.

  Note that the method of determining the correction coefficients of the edges T1 to T8 is not limited to the method described above.

  The configuration of the dimension measuring device 1 of the present embodiment is not limited to the above-described one aspect, and may be the following aspects.

  In the correction mode 41, noise removal of the image captured by the imaging unit 3 may be performed by a moving average filter or a median filter.

  In the filter processing in the correction mode 41, for example, a Sobel filter or a Prewitt filter is used as a primary difference operator. In the filtering process, a secondary difference operator may be used.

  In the correction mode 41, the binarization of the filtered image may be binarization using a moving average method or binarization using two thresholds.

  The shape of the marker 16 is not limited to a circle or a rectangle, and may be another polygon.

  The shape of the device under test 50 is not limited to a cube or a rectangular parallelepiped, and may be any shape as long as the shape of three surfaces imaged by the imaging unit 3 is substantially rectangular.

  The shape of the outer body 111 is a rectangular parallelepiped, but may be a cube, and the shape is not limited. Moreover, the shape which has a protrusion partially may be sufficient.

  The shape of the internal space 112 is a rectangular parallelepiped, but may be a cube, and the shape is not limited.

  The reference corner 15 may be any one of the four corners formed by the lower surface 201, the right surface 221, the left surface 231, the rear surface 241, and the front surface 263.

  The camera body 31 may be a CMOS (Complementary Metal Oxide Semiconductor) camera.

  In the imaging unit 3, the image to be captured may be gray scale or color. Here, when the image captured by the imaging unit 3 is a color image, it is preferable to convert the image into a grayscale image when performing image processing.

  In the imaging unit 3, the control unit of the camera body 31 and the lighting device 32 are connected, and ON / OFF of the lighting device 32 is operated by the control unit of the camera body 31. May be connected, and the lighting device 32 may be operated by the image processing unit 4.

  In the imaging unit 3, the control unit of the camera body 31 and the lighting device 3262 may be wirelessly connected.

  In the imaging section 3, the camera body 31 and the lighting device 32 may be provided separately.

  As the lighting device 32, a fluorescent lamp, a light bulb, or an LED of another color may be used. It is preferable that the illuminator 32 has a color or brightness in which an edge of an image captured by the camera body 31 is easily detected in the image processing unit 4.

  Various known microcomputers can be used as appropriate for the CPU of the image processing unit 4.

(effect)
In the dimension measuring method used in the above-described dimension measuring apparatus 1, the edge A1 corresponding to the sides of the lower surface portion 201, the first side surface portion 242, and the second side surface portion 232 in the binary image 42 easily by using the marker 16. ~ A9 can be easily identified. Therefore, the processing for correcting the distortion of the edges A1 to A9 and the edges T1 to T8 in the binary image 42 becomes easy, so that the measurement of the size of the DUT 50 can be accelerated.

  Further, by changing the color tone of the first marker 161, the second marker 162, and the third marker 163, the edges A1 to A9 corresponding to the sides of the lower surface portion 201, the first side surface portion 242, and the second side surface portion 232 can be more distinguished. Easier to do.

  As described above, the dimension measuring method of the present embodiment has the following configuration.

  The dimension measuring method according to the present embodiment has the following first feature. The first feature is provided with a housing chamber 11 for accommodating the object 50 to be taken in and out freely, and an imaging section 3 provided in the accommodation room 11 and imaging the object 50 accommodated in the accommodation room 11. An image processing unit that performs image processing based on information of an image captured by the imaging unit and measures the size of the device under test;

  The accommodation room 11 has a rectangular lower surface 201 on which the device under test 50 is placed, a first rectangular side surface 242 extending upward from the lower surface 201, and an upper extending from the lower surface 201, A second side surface portion 232 adjacent to the one side surface portion 242. The accommodation room 11 includes a first entry corner 12 formed by the lower surface portion 201 and the first side surface portion 242, a second entry corner 13 formed by the lower surface portion 201 and the second side surface portion 232, and a first side surface portion 242. And a third corner 14 formed by the second side surface portion 232. The accommodation room 11 has a reference corner 15 formed at a portion where the first entry corner 12, the second entry corner 13, and the third entry corner 14 intersect, and serves as a reference point for arranging the device under test 50 at a predetermined position. . The accommodation room 11 has a marker 16 that displays the positions of the sides of the first side surface portion 242, the second side surface portion 232, and the lower surface portion 201.

  The image processing unit 4 creates a binary image 42 by performing binarization on an image captured by the imaging unit 3 before the device under test 50 is placed in the accommodation room 11. The image processing unit 4 identifies the marker 16 in the binary image 42, and detects the edges A <b> 1 to A <b> 1 corresponding to the sides of the first side surface 242, the second side surface 232, and the lower surface 201 in the binary image 42 from the marker 16. A9 is identified, and distortion correction data is created based on the distortion of the edges A1 to A9. The image processing unit 4 creates a binary image 42 by performing binarization on an image captured by the imaging unit 3 in a state where the device 50 is arranged in the accommodation room 11. The image processing unit 4 obtains the corrected image 44 by correcting the distortion of the edges T1 to T8 of the device under test 50 identified in the binary image 42 based on the distortion correction data. The image processing unit 4 measures the size of the device under test 50 by scanning an area corresponding to the first side surface 242, the second side surface 232, and the lower surface 201 of the corrected image 44.

  In the dimension measuring method having the first feature, the distortion in the binary image 42 can be easily corrected by using the marker 16.

  The dimension measuring method having the first characteristic has the following additional second characteristic. In the second feature, the accommodation room 11 faces the rectangular upper surface portion 251 extending from the upper edges of the first side surface portion 242 and the second side surface portion 232 and the first side surface portion 242, and And an entrance 261 for taking in and out of the vehicle.

  The imaging unit 3 is provided at an end of the upper surface 251 on the side of the entrance 261 opposite to the reference corner 15.

In the dimension measuring method having the second feature, the imaging section 3 easily captures the entire lower surface portion 201, the first side surface portion 242, the second side surface portion 232, the measured object 50, and the marker 16.
(Other examples of markers)
The marker 16 provided in the dimension measuring device 1 of the above-described embodiment may be in a mode as shown in FIG. 11 (this is another example). The dimension measuring apparatus 1 of this other example particularly relates to the shape of the marker 16.

  As shown in FIG. 11A, a plurality of markers 16 may be provided on the inner surface of the accommodation room 11. Here, the marker 16 has a circular shape. A plurality of first markers 161 are provided on the first side surface portion 242. The first markers 161 are provided at four corners of the first side surface part 242. The second markers 162 are provided at four corners of the second side surface portion 232. The third markers 163 are provided at four corners of the lower surface portion 201.

  Further, a plurality of markers 16 may be provided on the inner surface of the accommodation room 11, as shown in FIG. 11B. Here, the marker 16 has a circular shape, but unlike FIG. 9A, the third markers 163 provided at the four corners of the lower surface portion 201 are not colored inside the circle.

  Further, a plurality of markers 16 may be provided on the inner surface of the accommodation room 11, as shown in FIG. 11C. Here, the marker 16 has a circular shape. The first markers 161 are provided at both end portions of the first side surface portion 242 on the side opposite to the third corner 14. The second markers 162 are provided at both ends of the second side surface portion 232 at the end opposite to the third corner 14. The third marker 163 is not provided on the lower surface portion 201.

DESCRIPTION OF SYMBOLS 1 Dimension measuring device 11 Accommodation room 12 1st corner 13 2nd corner 14 3rd corner 15 Reference corner 16 Marker 201 Lower surface part 232 Second side part 242 First side part 3 Imaging part 4 Image processing part 42 Two Value image 44 Corrected image 50 DUT A1 to A9 edge T1 to T8 edge

Claims (2)

A storage chamber that accommodates the object to be measured in and out, an imaging unit that is provided in the accommodation room and captures an image of the object to be measured that is accommodated in the accommodation room, and based on information of an image captured by the imaging unit. An image processing unit that performs image processing to measure the size of the device under test,
The storage chamber has a rectangular lower surface on which the object to be measured is placed, a rectangular first side surface extending upward from the lower surface, and an upper extending from the lower surface, and A rectangular second side surface portion adjacent to the side surface portion, a first corner formed by the lower surface portion and the first side surface portion, and a second corner formed by the lower surface portion and the second side surface portion A third corner formed by the first side surface and the second side surface and a portion where the first corner, the second corner and the third corner intersect, and A reference corner that serves as a reference point for arranging the measurement object at a predetermined position, and a marker that displays a position of a side of the first side surface, the second side surface, and the lower surface,
The marker includes a first marker having a rectangular frame shape having a line along the third corner and a line parallel to the first corner in the first side surface, and a third marker in the second side surface. A rectangular frame-shaped second marker having a line along a corner and a line parallel to the second corner; and a line along the first corner and a line parallel to the second corner on the lower surface. A third marker having a rectangular frame shape,
The image processing unit creates a binary image by performing binarization on the image captured by the imaging unit in a state before the object to be measured is arranged in the storage room. Identifying the marker in the value image, identifying the edges corresponding to the sides of the first side surface, the second side surface, and the lower surface in the binary image from the marker, and correcting the distortion of the edge. Create distortion correction data based on, in a state where the object to be measured is arranged in the storage room, to create a binary image by performing binarization on the image captured by the imaging unit, A corrected image is obtained by correcting distortion of the edge of the device under test identified in the binary image based on the distortion correction data, and the first side surface portion and the second side surface of the corrected image are obtained. The object to be measured is scanned by scanning in a plane corresponding to the part and the lower part. Dimension measuring method characterized by measuring the size. The storage chamber has a rectangular upper surface portion extending from upper edges of the first side surface portion and the second side surface portion, and an entrance facing the first side surface portion for taking in and out the object to be measured. , And
2. The method according to claim 1, wherein the imaging unit is provided at an end of the upper surface on the entrance side opposite to the reference corner. 3.

Images