JP2022077872A - Image measurement device, image measurement method and image measurement program - Google Patents

Abstract

To provide an image measurement device which accurately measures the joint length of a reinforcing-bar.SOLUTION: An image measurement device 100 according to an embodiment of the present invention comprises a measurement unit 34 which measures the length of a joint of a reinforcing-bar along the reinforcing-bar direction on the basis of three-dimensional coordinates of measurement points 11, 12 set on a photographed image and the reinforcing-bar direction.SELECTED DRAWING: Figure 7

Description

The present invention is a technique relating to an image measuring device, and more particularly to an image measuring device capable of accurately measuring a joint of a reinforcing bar by image processing.

Currently, the development of a device that calculates the three-dimensional position of a subject by image processing a digital image is underway. Further, a technique of applying such a device to a reinforcing bar arrangement inspection and inspecting the reinforcing bar diameter and the reinforcing bar spacing is being studied. For example, Patent Document 1 discloses an imaging device that acquires an image taken in a state of being in focus on a target reinforcing bar and calculates the diameter of the target reinforcing bar.

Japanese Unexamined Patent Publication No. 2017-3364

One of the bar arrangement inspections is the measurement of the joint length of the reinforcing bar. In order to measure the length of the joint by image processing, it is conceivable to set both ends of the joint and calculate the length from the three-dimensional coordinates of the set points. However, since the shape of the reinforcing bar is cylindrical and the surface of the reinforcing bar is provided with nodes at regular intervals, the three-dimensional coordinates of both ends of the joint may not be uniquely determined, and the joint length is the same. However, the measurement result differs depending on the positional relationship of the set measurement points, and it is difficult to measure the length of the joint with high accuracy.

One aspect of the present invention is to realize an image measuring device, an image measuring method, and an image measuring program capable of accurately measuring the joint length of a reinforcing bar based on two measurement points set on an image. With the goal.

In order to solve the above-mentioned problems, the image measuring device according to one aspect of the present invention is an image measuring device that measures the length of a joint using two reinforcing bar joints. On the captured image, a measurement point acquisition unit that acquires measurement points set at the end of one reinforcing bar and the end of the other reinforcement included in the joint, and three-dimensional coordinates of each measurement point are acquired. A measuring unit that measures the length of the joint along the reinforcing bar direction based on the coordinate acquisition section, the direction specifying section that specifies the reinforcing bar direction, the three-dimensional coordinates of each measurement point, and the reinforcing bar direction. And have.

In order to solve the above-mentioned problems, the image measurement method according to one aspect of the present invention is an image measurement method for measuring the length of a joint using two reinforcing bar joints. A measurement point acquisition step for acquiring measurement points set at the end of one reinforcing bar and the end of the other reinforcing bar included in the joint on the captured image, and acquisition of three-dimensional coordinates of each measurement point. A measurement step of measuring the length of the joint along the reinforcing bar direction based on the coordinate acquisition step, the direction specifying step for specifying the reinforcing bar direction, the three-dimensional coordinates of each of the measuring points, and the reinforcing bar direction. And, including.

In order to solve the above-mentioned problems, the image measurement program according to one aspect of the present invention is an image measurement program for operating a computer as the image measurement device, and is the measurement point acquisition unit, the coordinate acquisition unit, and the like. It is an image measurement program for making a computer function as the direction specifying unit and the measuring unit.

According to one aspect of the present invention, the joint length of the reinforcing bar can be accurately measured based on the two measurement points set on the image.

It is a block diagram which shows the structure of the image measuring apparatus which concerns on one Embodiment of this invention. It is a side view which shows the structure of the joint of the reinforcing bar which is the object measured by the image measuring apparatus which concerns on one Embodiment of this invention. It is a figure explaining the problem which is concerned in measuring the length of a joint of a reinforcing bar. It is a figure explaining the problem which is concerned in measuring the length of a joint of a reinforcing bar. It is a figure explaining the problem which is concerned in measuring the length of a joint of a reinforcing bar. It is a figure explaining the concept of the measurement of the joint length by the image measuring apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the detailed structure of the image processing part shown in FIG. It is a figure explaining another concept of the measurement of the joint length by the image measuring apparatus which concerns on one Embodiment of this invention. It is a figure explaining the measurement of the joint length by the image measuring apparatus which concerns on one Embodiment of this invention. It is a figure which shows the display content on the display part by the image measuring apparatus which concerns on one Embodiment of this invention. It is a figure which shows the processing flow of the image measurement method which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the image processing part of the image measuring apparatus which concerns on other embodiment of this invention. It is a figure explaining the image measurement method which concerns on other embodiment of this invention. It is a figure explaining the image measurement method which concerns on other embodiment of this invention. It is a figure explaining the image measurement method which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The expressions in each figure are exaggerated for easy understanding and may differ from the actual ones.

[Embodiment 1]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 11.

FIG. 1 is a diagram showing a configuration of an image measuring device of the present embodiment. The image measuring device 100 of the present embodiment includes an imaging unit 101, an imaging unit 102, an image processing unit 103, a display unit 104, an input unit 105, and a recording unit 106. The image measuring device 100 can be used to measure the joint length of the reinforcing bar in the measurement of the reinforcing bar. In particular, as shown in FIG. 2, it can be suitably used for measuring the length of a portion in which the vicinity of the ends of the reinforcing bars are overlapped and joined so that the directions of the reinforcing bars (stretching direction) are parallel to each other. In addition, although this part may be referred to as a "layered joint", in the present specification, this part is referred to as a "reinforcing bar joint" or simply a "joint".

The image pickup unit 101 and the image pickup unit 102 are composed of solid-state image pickup elements such as a CCD (Charge Coupled Device) and a CMOS (Complementary Metal Oxide Sensor) sensor, a lens, and the like, and capture an image according to shooting conditions such as set exposure and focus position. get.

The image processing unit 103 performs image processing to measure the length of the joint. Although the details will be described later, the image processing unit 103 is subjected to software processing by a CPU (Central Processing Unit) or GPU (Graphics Processing Unit), software processing by an ASIC (Application Specific Integrated Circuit), or FPGA (Field Program) hardware processing by FPGA (Field Program). Processing can be realized.

The display unit 104 is a display for confirming the images acquired by the image pickup unit 101 and the image pickup unit 102, and the measurement result of the joint length. The display unit 104 is composed of a display such as a liquid crystal display or an organic EL (Electroluminescence) display.

The input unit 105 is composed of a mouse and a touch panel of the display unit 104.

The recording unit 106 includes a recording medium such as a flash memory or a magnetic disk, and can record an image and a measurement result of a joint length calculated by the image processing unit 103.

(Structure of image processing unit 103)
FIG. 2 shows a joint composed of a first reinforcing bar 1 and a second reinforcing bar 2. When measuring the length of the joint shown in FIG. 2, for example, as shown in FIG. 3, a first measurement point 11 is set at the end portion 1a of the first reinforcing bar 1 included in the joint. Further, a measurement point 12 is set at the end 2a of the second reinforcing bar 2 included in the joint. Then, when trying to measure the joint length, the first measurement point 11 and the second measurement point 12 are connected in the shortest time based on the three-dimensional coordinates of the first measurement point 11 and the second measurement point 12. Calculate the distance. Then, since the two measurement points 11 and 12 are set diagonally with respect to the direction of the joint, the distance is measured longer than the actual joint length to be measured. In other words, it can be said that the measurement accuracy is low.

Further, as shown in FIG. 4, it is conceivable to set two measurement points 401 and 402 in the same direction as the direction of the joint, that is, on the same reinforcing bar. However, it is often difficult to set the measurement point 402 indicating the end portion of the reinforcing bar 2 at a position other than the end portion of the reinforcing bar, and the measurement accuracy is lowered. Further, in FIG. 4, the measurement point 402 may have a small feature amount unlike the end of the reinforcing bar, and the parallax calculation accuracy is lowered and the measurement accuracy is lowered, or the measurement is performed with high accuracy at a position corresponding to the direction of the joint. The point 402 cannot be set and the measurement accuracy is reduced.

Further, FIG. 5 is a view of the first measurement point 11 and the second measurement point 12 set as shown in FIG. 3 as viewed from the reinforcing bar direction. Here, the "reinforcing bar direction" can be rephrased as the stretching direction of the reinforcing bar or the longitudinal direction of the reinforcing bar. As shown in FIG. 5, the second measurement point 12 is set at the node 2b of the second reinforcing bar 2. In such a case, for example, the first measurement point 11 and the second measurement point 12 in FIG. 3 do not exist on the plane parallel to the paper surface and are set diagonally with respect to the direction of the joint, so that the portion of the node 2b is divided. However, the measurement accuracy is further reduced. Further, since the reinforcing bars 1 and 2 have a circular cross section, even if a measurement point is set at the reinforcing bar end (edge of the reinforcing bar in the illustrated cross section), the measurement result will change depending on the position of the reinforcing bar end. That is, the three-dimensional coordinates of both ends of the joint may not be uniquely determined due to the cylindrical shape of the reinforcing bar and the provision of knots at regular intervals on the surface of the reinforcing bar, so that the joint length is the same. Even if there is, the measurement result of the joint length differs depending on the positional relationship of the three-dimensional coordinates of both ends of the joint, and it may be difficult to measure the length of the joint with high accuracy.

Therefore, as shown in FIG. 6, the image measuring device 100 of the present embodiment has a first measurement when measuring the joint length based on the set first measurement point 11 and the second measurement point 12. The joint length is measured along the direction of the reinforcing bar 1 or the second reinforcing bar 2. This is because the reinforcing bar directions of the first reinforcing bar 1 and the second reinforcing bar 2 are considered to be parallel to the joint direction. Specifically, the image processing unit 103 shown in FIG. 1 has an end portion 1a of the first reinforcing bar 1 and an end of the second reinforcing bar 2 included in the joint on the captured image generated by the imaging unit 101 and the imaging unit 102. Based on the three-dimensional coordinates of the measurement points 11 and 12 set in the portion 2a and the reinforcing bar direction of the first reinforcing bar 1, the length of the joint along the reinforcing bar direction is measured.

FIG. 7 shows a block diagram showing the configuration of the image processing unit 103. As shown in FIG. 7, the image processing unit 103 includes a measurement point acquisition unit 31, a coordinate acquisition unit 32, a direction specifying unit 33, a measurement unit 34, and a display control unit 35.

The measurement point acquisition unit 31 acquires two measurement points 11 and 12 set on the captured image. The first measurement point 11 and the second measurement point 12 are input by the input unit 105, and the measurement point acquisition unit 31 detects the coordinates on the image corresponding to the input points to perform the first measurement. The information of the point 11 and the second measurement point 12 is acquired. For example, when the input unit 105 is composed of a mouse or a touch panel, the measurement point acquisition unit 31 acquires the coordinate information on the image because the positions on both sides of the joint region are input by the user. At this time, the measurement point acquisition unit 31 detects the end face of the joint region close to the input position and sets the measurement point on the joint end face, so that the joint region can be accurately input even if the measurement point is input at a deviated position. Since the measurement points can be obtained at both ends of the, more accurate measurement can be performed.

The coordinate acquisition unit 32 acquires the three-dimensional coordinates of the first measurement point 11 and the second measurement point 12. The coordinate acquisition unit 32 calculates the parallax from the images taken by the image pickup unit 101 and the image pickup unit 102, and calculates the three-dimensional coordinates of the first measurement point 11 and the second measurement point 12 based on the parallax.

The parallax is the amount of deviation of the subject between the two images, and can be calculated by block matching or the like. In block matching, a reference window is set for a pixel of interest of a reference image (for example, an image generated by the image pickup unit 101), a reference window is sequentially set for a reference image (for example, an image generated by the image pickup unit 102), and a reference window is set. Evaluate the similarity or difference between the pixels of the window and the reference window. For evaluation, SAD (Sum of Absolute Assessment), SSD (Sum of Squared Difference), and the like are used.

The relationship between the distance Z to the photographed subject and the parallax D is D = f × B / Z. f is the focal length of the imaging unit, and B is the distance between the two imaging units. Further, the three-dimensional coordinates (X, Y, Z) of the subject at the distance Z at the coordinates (x, y) on the image can be calculated by X = x × Z / f and Y = y × Z / f. can.

Here, in the image measuring device 100 of the present embodiment, the method of calculating the three-dimensional information from the images acquired by the two image pickup units will be described, but the three-dimensional information can be calculated from three or more image pickup units, or TOF (Time Of). It may be acquired by (Flight).

The direction specifying unit 33 specifies the reinforcing bar direction of the first reinforcing bar 1. The reinforcing bar direction may be a direction specified with reference to a three-dimensional straight line, or may be a direction specified in a three-dimensional plane. The first embodiment describes a configuration in which the reinforcing bar direction is specified with reference to a three-dimensional straight line, and the second embodiment describes a configuration in which the reinforcing bar direction is specified in a three-dimensional plane. The reinforcing bar direction can be calculated from the direction of the reinforcing bar edge 1e. Reinforcing bar edges 1e are two parallel ends extending along the longitudinal direction of the first reinforcing bar 1 on the captured image. The reinforcing bar edge 1e is a portion between the knots 1b and the knots 1b. For example, the direction specifying unit 33 detects an edge on a captured image, performs a Hough transform on the detected edge, and calculates a reinforcing bar edge straight line representing the edge of the reinforcing bar. Then, the direction specifying unit 33 calculates the three-dimensional coordinates of the edge group in the vicinity of the straight line of the reinforcing bar edge. Further, the direction specifying unit 33 calculates an approximate straight line of the calculated three-dimensional point group to calculate a reinforcing bar edge three-dimensional straight line, and calculates the reinforcing bar direction as a three-dimensional straight line from the two reinforcing bar edge three-dimensional straight lines (FIG. A one-point chain line in 6 indicates the reinforcing bar direction 50).

The measuring unit 34 measures the length of the joint along the reinforcing bar direction based on the three-dimensional coordinates of the first measuring point 11 and the second measuring point 12 and the reinforcing bar direction. Specifically, the measuring unit 34 draws perpendicular lines from the positions of the three-dimensional coordinates of the first measuring point 11 and the second measuring point 12 on the three-dimensional straight line in the direction of the reinforcing bar specified by the direction specifying unit 33. The distance between the intersections is measured as the length of the joint (the length shown by the broken line in FIG. 6).

Here, in the present embodiment, the reinforcing bar direction is calculated from the reinforcing bar edge, but the present invention is not limited to this. For example, three-dimensional coordinates are calculated for the edge group of the reinforcing bar region, and since the reinforcing bar is assumed to be a cylinder and the edge group exists on the surface of the cylinder, the central axis of the cylinder can be calculated as the reinforcing bar direction. FIG. 8 is a diagram in which the reinforcing bar direction is taken in the left-right direction when the first measurement point 11 and the second measurement point 12 are set as in FIG. A perpendicular line extends from the first measurement point 11 and the second measurement point 12 in the reinforcing bar direction, and the joint length is measured along the reinforcing bar direction.

FIG. 9 shows a case where the central axis of the reinforcing bar 1 is used in the reinforcing bar direction 50, and vertical lines extend from the first measurement point 11 and the second measuring point 12 to the central axis of the reinforcing bar 1, respectively, and along the reinforcing bar direction 50. The mode in which the distance between the three-dimensional straight line of the central axis and the intersection of each perpendicular line is measured as the joint length is shown.

As yet another embodiment, when the reinforcing bar position and the straight line indicating the reinforcing bar are calculated when measuring the reinforcing bar diameter and the reinforcing bar spacing, the information can be used as the reinforcing bar direction.

In this embodiment, the first reinforcing bar 1 is used to specify the reinforcing bar direction, but the present invention is not limited to this, and the second reinforcing bar 2 may be used to specify the reinforcing bar direction. Alternatively, the reinforcing bar direction may be calculated using the first reinforcing bar 1 and the second reinforcing bar 2, respectively, and then the average thereof may be specified as the reinforcing bar direction.

The result measured by the measuring unit 34 is recorded in the recording unit 106 as a file such as text data, or displayed on the display unit 104 as an image.

The display control unit 35 superimposes and displays the numerical value of the length of the joint calculated by the measurement unit 34 and the information indicating that the length is the length along the reinforcing bar direction on the captured image. The display unit 104 (FIG. 1) is controlled. As shown in FIG. 10, the display on the display unit 104 superimposes the measurement result on the image taken by the joint. At this time, since the joint length is not the distance between the two points, they are superimposed so that the measured direction can be known. In the example shown in FIG. 10, a straight line indicating the direction of the reinforcing bar and a vertical line from the measurement point to the straight line indicating the direction of the reinforcing bar are projected and drawn on the image, and an arrow and a joint length parallel to the direction of the reinforcing bar are drawn on the image. Draw the measured value.

(Processing flow)
FIG. 11 shows a processing flow of an image measurement method (joint measurement) using the image measurement device 100.

First, in a state where the captured images generated by the imaging unit 101 and the imaging unit 102 are input to and displayed on the display unit 104, the end portion 1a of the first reinforcing bar 1 in which the user is included in the joint is displayed on the display screen. Measurement points 11 and 12 are set at the end 2a of the second reinforcing bar 1. When the measurement points 11 and 12 are input, the measurement point acquisition unit 31 of the image processing unit 103 acquires the measurement point information (measurement point acquisition step, step S1).

Next, the coordinate acquisition unit 32 acquires the information of the measurement points acquired by the measurement point acquisition unit 31 in step S1 and calculates the three-dimensional coordinates of the first measurement point 11 and the second measurement point 12 (coordinates). Acquisition process, step S2).

Next, the direction specifying unit 33 calculates a three-dimensional straight line by detecting the edge of the first reinforcing bar 1 constituting the joint, and specifies this as the reinforcing bar direction of the first reinforcing bar 1 (direction specifying step, step S3). ..

Next, the measuring unit 34 acquires the three-dimensional coordinates of the first measuring point 11 and the second measuring point 12 and the three-dimensional straight line indicating the direction of the reinforcing bar, draws a vertical line as described above, and performs the tertiary. The distance between the intersections with the original straight line is calculated, and the joint length along the reinforcing bar direction is measured (measurement step, step S4).

The measured joint length is controlled by the display control unit 35 so that the value of the length is displayed on the display unit 104 together with the reinforcing bar direction. In addition to the value of the length, information such as a determination result of whether the joint length is as designed may be controlled to be displayed on the display unit 104.

As described above, according to the present embodiment, the joint length of the reinforcing bar can be accurately measured based on the two measurement points set on the image.

[Modification 1]
The following aspects are also available as modifications of the present embodiment. That is, in the image measuring device of this modification, in addition to the joint measurement, a function of measuring the distance between arbitrary two points is implemented. In this modification, a mode for measuring the distance between arbitrary two points and a joint measurement mode for measuring the joint length by the method described in the above-described embodiment can be selected. When the joint measurement mode is selected, the mode can be switched, such as measuring based on the reinforcing bar direction as described above.

[Modification 2]
In the present embodiment, a method of setting a measurement point using an input unit 105 such as a mouse or a touch panel has been described, but the same effect can be obtained even if the measurement point is automatically set. For example, in an image of a reinforcing bar surface, when the reinforcing bar positions are calculated by dividing into a plurality of areas and grouped in consideration of the continuity of the reinforcing bars, the reinforcing bars arranged vertically or horizontally are deviated by a threshold value or more. If they are adjacent to each other, it is possible to determine that the joint is a joint, detect the edge of the region, detect the end face of the reinforcing bar, and set a measurement point on the end face of the reinforcing bar.

[Embodiment 2]
Other embodiments of the present invention will be described below. For convenience of explanation, the same reference numerals are given to the members having the same functions as the members described in the above-described embodiment, and the description thereof will not be repeated.

In the first embodiment described above, the joint length is measured using the reinforcing bar direction specified as a three-dimensional straight line. On the other hand, in the second embodiment, the joint length is calculated based on the direction of the reinforcing bar specified in the reinforcing bar plane including the reinforcing bar constituting the joint.

Specifically, as shown in FIG. 12, in the second embodiment, the direction specifying portion 33 having the reinforcing bar plane specifying portion 331 and the reinforcing bar direction specifying portion 332 instead of the direction specifying portion 33 of the first embodiment. 'Equipped with.

The reinforcing bar plane specifying portion 331 identifies the reinforcing bar plane based on the three-dimensional coordinates on the edge of the reinforcing bar. The reinforcing bar plane can be calculated as a three-dimensional plane from the least squares plane obtained by calculating the three-dimensional coordinates of the edges of a plurality of reinforcing bars. Here, it is preferable to calculate the reinforcing bar plane not only from the reinforcing bars constituting the joint to be measured but also from the reinforcing bar plane on the reinforcing bar including the reinforcing bar. That is, it is calculated from not only the reinforcing bars constituting the joint but also the reinforcing bars constituting the joint and a plurality of reinforcing bars arranged in parallel with the reinforcing bars. This makes it possible to stably calculate the reinforcing bar plane of the reinforcing bar arrangement. However, the present invention is not limited to this, and a plane including the central axis of the reinforcing bar 1 and the central axis of the reinforcing bar 2 may be calculated, or may be a plane offset from this plane. The central axis can be calculated because the three-dimensional coordinates are calculated for the edge group of the reinforcing bar region, the reinforcing bar is assumed to be a cylinder, and the edge group exists on the surface of the cylinder.

The reinforcing bar direction specifying portion 332 specifies the reinforcing bar direction in the reinforcing bar plane. Specifically, the reinforcing bar direction specifying unit 332 specifies a three-dimensional straight line representing the reinforcing bar direction on the reinforcing bar plane. For example, the central axis of the reinforcing bar is projected onto the reinforcing bar plane to specify the reinforcing bar direction on the reinforcing bar plane. However, not limited to this, edge detection is performed from the image, Hough transform is performed based on the edge detection result, a reinforcing bar edge straight line indicating the edge of the reinforcing bar is calculated for each reinforcing bar, and two reinforcing bar edges calculated for each reinforcing bar. It can also be obtained by calculating the reinforcing bar position straight line passing through the center of each reinforcing bar on the reinforcing bar plane from the straight line.

In the measurement of the joint length in the reinforcing bar direction by the measuring unit 34, the set measurement point and the specified reinforcing bar direction are projected onto the specified reinforcing bar plane, and the length is measured three-dimensionally on the reinforcing bar plane. I do.

FIG. 13 is a diagram schematically showing the projection on the reinforcing bar plane. In FIG. 13, the direction of the reinforcing bar passing through the central axis of each reinforcing bar is shown by a dotted chain line, and the reinforcing bar plane P is shown by a broken line. Further, FIG. 13 shows projection points 11 ′ and 12 ′ in which measurement points 11 and 12 set at the end portion 1a of the reinforcing bar 1 and the end portion 2a of the second reinforcing bar 2 are projected onto the reinforcing bar plane P. FIG. 14 illustrates a state in which the two reinforcing bars 1 and 2 constituting the joint are cut perpendicular to the reinforcing bar direction at the measurement points 11 and 12, respectively, and the reinforcing bar plane P. As shown in FIG. 14, the set measurement points 11 and 12 are projected onto the reinforcing bar plane P (projection points 11'and 12').

The measuring unit 34 measures the length of the joint along the reinforcing bar direction based on each measurement point, the reinforcing bar direction, and the reinforcing bar plane. Specifically, the measuring unit 34 calculates the length between the projection points 11'and 12'based on the reinforcing bar plane P by using the three-dimensional coordinates of the projection points 11'and 12'and the direction of the reinforcing bar. Then, measure the length of the joint along the direction of the reinforcing bar. FIG. 15 shows the measurement process by the measurement unit 34 in an easy-to-understand manner. FIG. 15 is a view of the reinforcing bar plane P as viewed from above. As shown in FIG. 15, the length of the joint can be accurately measured by calculating the distance between the projection points 11'and 12'on the reinforcing bar plane P along the reinforcing bar direction.

By the above method, the joint length on the reinforcing bar plane can be calculated accurately in the reinforcing bar direction. In particular, in the embodiment of the present embodiment, since there are a plurality of joints in the reinforcing bar plane and the lengths of the plurality of joints are measured, the lengths in the reinforcing bar direction are measured in the same plane. It is suitable because it is easy to compare the lengths. For example, when performing joint length measurement, if multiple joint lengths are measured and it is estimated that the reinforcing bars that make up each joint are on the same plane, the reinforcing bars are automatically set to the same plane. , Measurement on the same rebar plane by notifying that the joint length will be measured on the same rebar plane and displaying so that the user can select to measure the joint length on the same rebar plane. Can be realized by processing that is easy for the user to operate.

[Example of implementation by software]
The image processing unit 103 (measurement point acquisition unit 31, coordinate acquisition unit 32, direction specifying unit 33, 33', measurement unit 34, and display control unit 35) of the image measurement device 100 is formed in an integrated circuit (IC chip) or the like. It may be realized by a logic circuit (hardware), or may be realized by software.

In the latter case, the image measuring device 100 includes a computer that executes instructions of a program that is software that realizes each function. The computer includes, for example, at least one processor (control device) and at least one computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes the program, thereby achieving the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "non-temporary tangible medium", for example, a ROM (Read Only Memory) or the like, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the program may be further provided. Further, the program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. It should be noted that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

〔summary〕
The image measuring device 100 according to the first aspect of the present invention is an image measuring device that measures the length of a joint of two reinforcing bars (first reinforcing bar 1, second reinforcing bar 2) by using an image of the joint. 100, on the captured image, the end of one reinforcing bar (end 1a of the first reinforcing bar 1) and the end of the other reinforcing bar (end 2a of the second reinforcing bar 2) included in the joint. ), The measurement point acquisition unit 31 for acquiring the measurement points (first measurement point 11, the second measurement point 12), and the coordinate acquisition unit 32 for acquiring the three-dimensional coordinates of each of the measurement points. Along the reinforcing bar direction based on the direction specifying portions 33, 33'that specify the reinforcing bar direction of one of the reinforcing bars (first reinforcing bar 1), the three-dimensional coordinates of each measurement point, and the reinforcing bar direction. It is provided with a measuring unit 34 for measuring the length of the joint.

According to the above configuration, the joint length of the reinforcing bar can be measured with high accuracy based on the two measurement points set on the image. Specifically, the direction of the reinforcing bar is specified, and the length of the joint is measured along the direction of the reinforcing bar. Therefore, regardless of whether the measurement points are set on different reinforcing bars or at any position on the end face of the reinforcing bars, the measurement results are the same, and highly reliable measurement can be realized.

In the image measuring device 100 according to the second aspect of the present invention, in the first aspect, the value of the length calculated by the measuring unit 34 or the information related to the value, and the length along the direction of the reinforcing bar. A display control unit 35 that controls the display unit 104 so as to superimpose and display the information indicating the length on the captured image may be further provided.

According to the above configuration, it is possible to present a highly reliable measurement result to the user.

In the image measuring device 100 according to the third aspect of the present invention, in the first aspect, the measuring unit 34 has a straight line (three-dimensional straight line) extending in the direction of the reinforcing bar, and each measuring point (first measuring point 11, The length of the joint may be measured as the distance between the intersections of the second measurement points 12) with their vertical lines drawn from the positions of the three-dimensional coordinates.

According to the above configuration, the distance between the intersections where the perpendicular line is drawn from the measurement point on the straight line extending in the direction of the reinforcing bar can be calculated as the joint length, so that the measurement can be performed accurately even if the measurement points are not set on the same line. be able to.

In the image measuring device 100 according to the fourth aspect of the present invention, in the first aspect, the straight line extending in the direction of the reinforcing bar may be a straight line approximated to a plurality of three-dimensional coordinates on the edge of the one reinforcing bar.

According to the above configuration, the distance between the intersections where the perpendicular lines are drawn from the measurement points to a straight line approximated to a plurality of three-dimensional coordinates on the edge of one reinforcing bar can be calculated as the joint length, so that the measurement points are on the same line. Even if it is not set, it is possible to measure with high accuracy.

In the image measuring device 100 according to the fifth aspect of the present invention, in the third aspect, the straight line extending in the direction of the reinforcing bar may be the central axis of the one reinforcing bar.

According to the above configuration, the distance between the intersections where the perpendicular lines are drawn from each measurement point on the central axis of the reinforcing bar can be calculated as the joint length, so that the measurement can be performed accurately even if the measurement points are not set on the same line. be able to.

In the image measuring device 100 according to the sixth aspect of the present invention, in the first aspect, the direction specifying portion 33'is a reinforcing bar plane specifying portion 331 that specifies a reinforcing bar plane based on the three-dimensional coordinates of the reinforcing bar, and the reinforcing bar plane. It has a reinforcing bar direction specifying unit 332 that specifies the reinforcing bar direction in the inside, and the measuring unit 34 is along the reinforcing bar direction based on each of the measuring points, the reinforcing bar direction, and the reinforcing bar plane. It may be configured to measure the length of the joint.

According to the above configuration, the joint length on the reinforcing bar plane can be calculated accurately in the reinforcing bar direction.

The image measurement method according to the seventh aspect of the present invention is an image measurement method for measuring the length of a joint of two reinforcing bars (first reinforcing bar 1, second reinforcing bar 2) by using an image of the joint. Therefore, on the captured image, the end of one reinforcing bar (end 1a of the first reinforcing bar 1) and the end of the other reinforcing bar (end 2a of the second reinforcing bar 2) included in the joint. The measurement point acquisition step (step S1) for acquiring the measurement points (first measurement point 11, the second measurement point 12) set in, and the coordinate acquisition step (step) for acquiring the three-dimensional coordinates of each of the measurement points. S2), a direction specifying step (step S3) for specifying the reinforcing bar direction of one of the reinforcing bars (first reinforcing bar 1), the three-dimensional coordinates of each measurement point, and the reinforcing bar direction. A measurement step (step S4) for measuring the length of the joint along the reinforcing bar direction is included.

According to the above configuration, the joint length of the reinforcing bar can be measured with high accuracy based on the two measurement points set on the image. Specifically, the direction of the reinforcing bar is specified, and the length of the joint is measured along the direction of the reinforcing bar. Therefore, regardless of whether the measurement points are set on different reinforcing bars or at any position on the end face of the reinforcing bars, the measurement results are the same, and highly reliable measurement can be realized.

Further, the image measuring device according to each aspect of the present invention may be realized by a computer. In this case, the image measuring device is operated by operating the computer as each part (software element) included in the image measuring device. The image measurement program of the image measurement device realized in the above, and the computer-readable recording medium on which the image measurement program is recorded are also included in the scope of the present invention.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Further, by combining the technical means disclosed in each embodiment, new technical features can be formed.

1 1st rebar 1a end 1e rebar edge 2 2nd rebar 2a end 11 1st measurement point 12 2nd measurement point 11', 12'projection point 31 measurement point acquisition unit 32 coordinate acquisition unit 33, 33 'Direction specifying unit 34 Measuring unit 35 Display control unit 50 Reinforcing bar direction 100 Image measuring device 101, 102 Imaging unit 103 Image processing unit 104 Display unit 105 Input unit 106 Recording unit 331 Reinforcing bar plane specifying unit 332 Reinforcing bar direction specifying unit

Claims (8)

It is an image measuring device that measures the length of the joint using the captured image of the joint of two reinforcing bars.
On the captured image, a measurement point acquisition unit that acquires measurement points set at the end of one reinforcing bar and the end of the other reinforcing bar included in the joint, and
A coordinate acquisition unit that acquires the three-dimensional coordinates of each measurement point,
The direction specification part that specifies the direction of the reinforcing bar, and
A measuring unit that measures the length of the joint along the reinforcing bar direction based on the three-dimensional coordinates of each measuring point and the reinforcing bar direction.
An image measuring device characterized by being equipped with. The value of the length calculated by the measuring unit or the information related to the value and the information indicating that the length is the length along the direction of the reinforcing bar are superimposed and displayed on the captured image. The image measuring apparatus according to claim 1, further comprising a display control unit that controls the display unit. The measuring unit measures the distance between the intersections of the straight lines extending in the direction of the reinforcing bars from the positions of the three-dimensional coordinates of the measuring points, respectively, as the length of the joint.
The image measuring apparatus according to claim 1 or 2, wherein the image measuring device is characterized by the above. The image measuring device according to claim 3, wherein the straight line extending in the direction of the reinforcing bar is a straight line approximated to a plurality of three-dimensional coordinates on the edge of one of the reinforcing bars. The image measuring device according to claim 3, wherein the straight line extending in the direction of the reinforcing bar is the central axis of one of the reinforcing bars. The direction specifying part is
Reinforcing bar plane specifying part that specifies the reinforcing bar plane based on the three-dimensional coordinates of the reinforcing bar,
Reinforcing bar direction specifying portion that specifies the reinforcing bar direction in the reinforcing bar plane,
Have,
The measuring unit measures the length of the joint along the reinforcing bar direction based on each measuring point, the reinforcing bar direction, and the reinforcing bar plane.
The image measuring apparatus according to claim 1 or 2, wherein the image measuring device is characterized by the above. It is an image measurement method that measures the length of a joint using two reinforcing bar joint images.
A measurement point acquisition step of acquiring measurement points set at the end of one reinforcing bar and the end of the other reinforcing bar included in the joint on the captured image, and
The coordinate acquisition process for acquiring the three-dimensional coordinates of each measurement point,
Direction specifying process to specify the direction of the reinforcing bar,
A measurement step of measuring the length of the joint along the direction of the reinforcing bar based on the three-dimensional coordinates of each measurement point and the direction of the reinforcing bar.
An image measurement method characterized by including. An image measurement program for operating a computer as the image measurement device according to any one of claims 1 to 6, wherein the measurement point acquisition unit, the coordinate acquisition unit, the direction specifying unit, and the measurement unit are used. An image measurement program to make your computer work as.

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