JP2018173274A - Data calculation device, data calculation method and data calculation program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify the diameter or nickname of a reinforcing bar accurately from a photographed image of the reinforcing bar to be inspected.SOLUTION: A data calculating device for specifying the diameter or nickname of a reinforcing bar from a photographed image of the reinforcing bar having a plurality of nodes includes an extracting unit for extracting image areas of the reinforcing bar from photographed images and an inter-node distance calculation unit for calculating a distance between two non-adjacent nodes possessed by the reinforcing bar from the image area extracted by the extracting unit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a data calculation device, a data calculation method, and a data calculation program for specifying the diameter or name of a reinforcing bar from a captured image obtained by imaging a reinforcing bar having a plurality of nodes.

  Conventionally, in the construction of a reinforced concrete structure or the like, a bar arrangement inspection is performed to check whether the reinforcing bars are correctly arranged based on a bar arrangement diagram or the like. In such bar arrangement inspection, introduction of a system for supporting bar arrangement inspection (hereinafter referred to as “bar arrangement inspection support system”) is being considered from the viewpoint of improving the efficiency of inspection and reducing the burden on the inspector.

  As an example of a bar arrangement inspection support system, an image of a plurality of adjacent nodes of a reinforcing bar to be inspected is detected from an image obtained by an imaging device that images a reinforcing bar to be inspected, and the detected plurality of nodes The distance between adjacent nodes is derived on the basis of the images of the secondary, and for the reinforcing bars having a plurality of predetermined diameters, the distance between the adjacent nodes and the diameter of the corresponding reinforcing bar are associated and stored in advance. A reinforcing bar inspection support device is known in which the diameter of a reinforcing bar to be inspected is specified by reading the diameter of the reinforcing bar corresponding to the derived distance from a storage unit (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2015-1146

  In a reinforcing bar having a plurality of nodes, display marks (rolling marks) for distinguishing the types of reinforcing bars are provided as reliefs such as protrusions and alphabets between some of the nodes. When such a reinforcing bar is to be inspected, the diameter of the reinforcing bar to be inspected by deriving the distance between adjacent nodes from the captured image of the reinforcing bar to be inspected as in the reinforcing bar inspection support device of Patent Document 1. In the system that specifies the distance between adjacent nodes, the distance between the adjacent nodes cannot be accurately derived by the display mark provided between the adjacent nodes, and the diameter of the reinforcing bar to be inspected can be accurately specified. There is a possibility that it cannot be done.

  In view of the above situation, an object of the present invention is to provide a data calculation device, a data calculation method, and a data calculation program that can accurately specify the diameter or name of a reinforcing bar from a captured image of the reinforcing bar to be inspected. To do.

  A first aspect of the present invention is a data calculation device for specifying a diameter or a name of a reinforcing bar from a captured image obtained by capturing a reinforcing bar having a plurality of nodes, and the image area of the reinforcing bar from the captured image. And an inter-node distance calculation unit that calculates a distance between two non-adjacent nodes of the reinforcing bar from the image region extracted by the extraction unit.

  According to a second aspect of the present invention, in the first aspect, the internode distance calculation unit calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the image region extracted by the extraction unit. Between the luminance distribution calculation unit, the peak detection unit for detecting two non-adjacent peaks from the luminance distribution calculated by the luminance distribution calculation unit, and the two non-adjacent peaks detected by the peak detection unit An inter-peak distance calculating unit that calculates a distance between the reinforcing bars based on a distance between the two non-adjacent peaks calculated by the inter-peak distance calculating unit. Calculate the distance between two non-adjacent nodes that you have.

  According to a third aspect of the present invention, in the second aspect, the two non-adjacent peaks detected by the peak detector are two peaks having a predetermined number of peaks between the two peaks, The peak detection unit detects a plurality of pairs of two non-adjacent peaks from the luminance distribution calculated by the luminance distribution calculation unit, and the inter-peak distance calculation unit detects the peak detection unit detected by the peak detection unit A distance between the two non-adjacent peaks of each of a plurality of pairs is calculated, and the internode distance calculation unit is based on the distances of the plurality of pairs calculated by the inter-peak distance calculation unit. The distance between two non-adjacent nodes of the reinforcing bar is calculated.

  According to a fourth aspect of the present invention, in the third aspect, the inter-node distance calculation unit is configured to determine whether the plurality of pairs are based on the distances of the plurality of pairs calculated by the inter-peak distance calculation unit. A pair excluding unit that excludes some pairs from the internode distance calculating unit, based on the distance of the plurality of pairs excluding the some pairs excluded by the pair excluding unit, A distance between two non-adjacent nodes of the reinforcing bar is calculated.

  According to a fifth aspect of the present invention, in the third aspect, the inter-node distance calculation unit is based on a minimum value among the distances of the plurality of pairs calculated by the inter-peak distance calculation unit. The distance between two non-adjacent nodes of the reinforcing bar is calculated.

  According to a sixth aspect of the present invention, in the second aspect, the luminance distribution calculation unit obtains luminance distributions on a plurality of straight lines along the axial direction of the reinforcing bar from the image region extracted by the extraction unit. The internode distance calculation unit further includes an averaging unit that averages the luminance distributions on the plurality of straight lines calculated by the luminance distribution calculation unit, and the peak detection unit includes the averaging unit The two non-adjacent peaks are detected from the luminance distribution averaged by.

  According to a seventh aspect of the present invention, in the first aspect, the internode distance calculation unit calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the image region extracted by the extraction unit. A luminance distribution calculation unit for calculating the inter-node distance, and a correlation degree calculation unit for calculating a degree of correlation of the luminance distribution calculated by the luminance distribution calculation unit according to an amount of movement in the axial direction. The unit calculates a distance between two non-adjacent nodes of the reinforcing bar based on the correlation degree calculated by the correlation degree calculation unit.

  According to an eighth aspect of the present invention, in the seventh aspect, the luminance distribution calculation unit obtains luminance distributions on a plurality of straight lines along the axial direction of the reinforcing bar from the image region extracted by the extraction unit. The inter-node distance calculation unit further includes an averaging unit that averages the luminance distributions on the plurality of straight lines calculated by the luminance distribution calculation unit, and the correlation degree calculation unit includes the averaging The degree of correlation according to the amount of movement in the axial direction of the luminance distribution averaged by the unit is calculated.

  In a ninth aspect of the present invention, in any one of the first to eighth aspects, the diameter or name of the reinforcing bar and the distance between two non-adjacent nodes of the reinforcing bar are stored in association with each other. Information relating to the distance between two non-adjacent nodes of the reinforcing bar calculated by the internode distance calculating unit, and the diameter or name of the reinforcing bar stored in association in the storage unit And an output unit that outputs information on a distance between two non-adjacent nodes of the reinforcing bar.

  In a tenth aspect of the present invention, in any one of the first to eighth aspects, the diameter or name of the reinforcing bar and the distance between two non-adjacent nodes of the reinforcing bar are stored in association with each other. Information relating to the distance between two non-adjacent nodes of the reinforcing bar calculated by the internode distance calculating unit, and the reinforcing bar stored in the storage unit in association with the distance. And an output unit that outputs information on the diameter or the name.

  An eleventh aspect of the present invention is a data calculation method for specifying a diameter or a name of a reinforcing bar from a captured image obtained by capturing a reinforcing bar having a plurality of nodes, and from the captured image, the image region of the reinforcing bar. And the distance between two non-adjacent nodes of the reinforcing bar is calculated from the extracted image region.

  A twelfth aspect of the present invention is a data calculation program for specifying a diameter or a name of the reinforcing bar from a captured image obtained by capturing a reinforcing bar having a plurality of nodes, and from the captured image, the image region of the reinforcing bar. And calculating a distance between two non-adjacent nodes of the reinforcing bar from the extracted image area.

  According to the present invention, there is an effect that the diameter or name of a reinforcing bar can be accurately specified from a captured image of the reinforcing bar to be inspected.

It is a hardware block diagram of the data calculation apparatus which concerns on 1st Embodiment. It is a functional block diagram of the data calculation device concerning a 1st embodiment. It is a figure which shows an example of the picked-up image which image | photographed the reinforcing bar made into a test object. It is a flowchart which shows the flow of the internode distance calculation process performed in the data calculation apparatus which concerns on 1st Embodiment. It is a figure which shows an example of several distance (distance between two nodes which are not adjacent). It is a figure which shows the example which excludes the distance made into an abnormal value out of several distance (distance between two nodes which are not adjacent). It is a figure explaining the derivation | leading-out example of the threshold value which prescribes | regulates the range for excluding an abnormal value. Information relating to the name and diameter of a reinforcing bar and the distance between two non-adjacent nodes of the reinforcing bar, stored in association with each other in a portable recording medium accommodated in an external storage device or portable recording medium driving device It is a figure which shows an example. FIG. 10 is a first diagram illustrating a display example. It is FIG. (2) which shows a display example. It is a functional block diagram of a data calculation device concerning the modification of a 1st embodiment. It is a flowchart which shows the flow of the internode distance calculation process performed in the data calculation apparatus which concerns on the modification of 1st Embodiment. It is a figure which shows an example of several average value. It is a functional block diagram of a data calculation device concerning a 2nd embodiment. It is a figure explaining the example which calculates the distance between two nonadjacent nodes which a reinforcing bar has based on the calculated correlation degree. It is a functional block diagram of a data calculation device concerning the modification of a 2nd embodiment. It is a functional block diagram of the data calculation device concerning a 3rd embodiment. It is a figure which shows an example in case there exists light sources, such as a work lamp, near the center of the reinforcing bar arrange | positioned indoors. It is a functional block diagram of the data calculation apparatus which concerns on the modification of 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>

  FIG. 1 is a hardware configuration diagram of a data calculation apparatus according to the first embodiment of the present invention. This data calculation device is a device for specifying the diameter or name of a reinforcing bar from a captured image obtained by photographing a reinforcing bar having a plurality of nodes, and is also an example of a bar arrangement inspection support system.

  As shown in FIG. 1, the data calculation device 10 includes a CPU (Central Processing Unit) 101, a memory 102, an input / output device 103, an external storage device 104, and a portable recording medium drive device in which a portable recording medium 107 is accommodated. 105 and a communication device 106. The CPU 101, the memory 102, the input / output device 103, the external storage device 104, the portable recording medium drive device 105, and the communication device 106 are connected to each other via a bus 108.

  The CPU 101 is an arithmetic device that executes a program for processing performed by the data calculation device 10. The memory 102 is, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory). The RAM is used as a work area of the CPU 101, and the ROM stores a program and information necessary for executing the program in a nonvolatile manner. .

  The input / output device 103 is an interface device that exchanges information with other devices such as a keyboard, a mouse, an imaging device (such as a digital camera), a display device, and a printer.

  The external storage device 104 is a storage that stores a program, information necessary for executing the program, information acquired by executing the program, and the like in a nonvolatile manner. The external storage device 104 is, for example, a hard disk device. The portable recording medium driving device 105 accommodates a portable recording medium 107 such as an optical disk or a compact flash (registered trademark). Similar to the external storage device 104, the portable recording medium 107 is a storage that stores a program, information necessary for executing the program, information acquired by executing the program, and the like in a nonvolatile manner.

  The communication device 106 is a communication interface device that transmits and receives information to and from other devices such as a terminal device and a server device via a communication network.

  In such a hardware configuration, the program and information necessary for executing the program may be input from another device such as a server via the communication network and the communication device 106.

FIG. 2 is a functional block diagram of the data calculation apparatus 10.
As shown in FIG. 2, the data calculation device 10 includes an extraction unit 111, an internodal distance calculation unit 112, a storage unit 113, and an output unit 114.

  The extraction unit 111 receives a captured image obtained by capturing a reinforcing bar to be inspected, and extracts an image area of the reinforcing bar from the captured image. Note that the reinforcing bar to be inspected is a reinforcing bar having a plurality of nodes, and the photographed image of the reinforcing bar to be inspected is taken and acquired by the imaging device. Such a captured image may be input from an imaging device connected to the input / output device 103 or may be read from the portable recording medium 107 accommodated in the portable recording medium driving device 105 and input. Alternatively, it may be input from a terminal device or a server device connected to the communication device 106 via a communication network.

  The internode distance calculation unit 112 calculates a distance between two non-adjacent nodes of the reinforcing bar from the image area extracted by the extraction unit 111. More specifically, the internodal distance calculation unit 112 includes a luminance distribution calculation unit 121, a peak detection unit 122, an inter-peak distance calculation unit 123, and a pair exclusion unit 124.

  The luminance distribution calculation unit 121 calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the image region extracted by the extraction unit 111. In the reinforcing bar image area, it is known that the image area of the reinforcing bar node and the display mark portion has higher luminance than the image area of the other part of the reinforcing bar.

  The peak detector 122 detects a plurality of pairs of two peaks that are not adjacent to each other from the luminance distribution calculated by the luminance distribution calculator 121. Here, two non-adjacent peaks are two peaks having a plurality of (for example, four) peaks between the two peaks.

  The peak-to-peak distance calculation unit 123 calculates the distance between two non-adjacent peaks of each of the plurality of pairs detected by the peak detection unit 122.

  The pair excluding unit 124 excludes some pairs from the plurality of pairs based on the distances between the plurality of pairs calculated by the inter-peak distance calculating unit 123 (distance between two non-adjacent peaks). .

  Then, the internode distance calculation unit 112 includes a part of the pairs excluded by the pair exclusion unit 124 in the distances between the plurality of pairs calculated by the inter-peak distance calculation unit 123 (the distance between two non-adjacent peaks). Based on the distance between the remaining pairs excluding, the distance between two non-adjacent nodes of the reinforcing bar is calculated. Alternatively, the internode distance calculation unit 112 is based on the distances between a plurality of pairs calculated by the interpeak distance calculation unit 123 (the distance between two nonadjacent peaks) between two nonadjacent nodes of the reinforcing bar. The distance may be calculated.

  The storage unit 113 stores information related to the diameter or name of the reinforcing bar and information related to the distance between two non-adjacent nodes of the reinforcing bar in association with each other. The storage unit 113 corresponds to the portable recording medium 107 accommodated in the external storage device 104 or the portable recording medium driving device 105, for example.

  The output unit 114 includes information on the distance between two non-adjacent nodes included in the reinforcing bar calculated by the internode distance calculation unit 112 and information on the diameter or name of the reinforcing bar stored in association in the storage unit 113. And information on the distance between two non-adjacent nodes of the reinforcing bar. Alternatively, the output unit 114 may include information on the distance between two non-adjacent nodes included in the reinforcing bar calculated by the internode distance calculating unit 112 and the reinforcing bar stored in the storage unit 113 in association with the distance. Outputs information on diameter or name. Note that the information output by the output unit 114 is displayed on a display device connected to the input / output device 103, for example.

  Next, the flow of processing performed in the data calculation apparatus 10 will be described with reference to FIGS.

  FIG. 3 is a diagram illustrating an example of a photographed image obtained by photographing a reinforcing bar to be inspected. FIG. 4 is a flowchart showing the flow of the internodal distance calculation process performed in the data calculation apparatus 10. FIG. 5 is a diagram illustrating an example of a plurality of distances (distances between two non-adjacent nodes). FIG. 6 is a diagram illustrating an example in which a distance that is an abnormal value is excluded from a plurality of distances (a distance between two non-adjacent nodes). FIG. 7 is a diagram illustrating an example of deriving a threshold value that defines a range for excluding abnormal values. FIG. 8 shows information about the name and diameter of a reinforcing bar stored in association with each other in the portable storage medium 107 accommodated in the external storage device 104 or the portable recording medium driving device 105 and two non-adjacent pieces of the reinforcing bar. It is a figure which shows an example of the information regarding the distance between nodes. FIG. 9 is a diagram (part 1) illustrating a display example. FIG. 10 is a second diagram illustrating a display example.

  In the data calculation device 10, when a photographed image obtained by photographing a reinforcing bar to be inspected as illustrated in FIG. 3 is input, the CPU 101 extracts an image area of the reinforcing bar from the photographed image. Here, as an example, it is assumed that an image area of a reinforcing bar in which display marks are provided between some nodes, such as the reinforcing bar 20 in the captured image illustrated in FIG. 3, is extracted.

  Next, the CPU 101 performs the inter-node distance calculation process shown in FIG. This process is a process of calculating (measuring) the distance between two non-adjacent nodes from the extracted reinforcing bar image area.

  More specifically, as shown in FIG. 4, the CPU 101 first sets the variable N to 0 (S401), and measures the distance between two non-adjacent nodes from the extracted reinforcing bar image area (S402). Here, as an example, two non-adjacent nodes are two nodes having four nodes between the two nodes. Such a distance between two non-adjacent nodes is also referred to as a distance corresponding to five nodes.

  Next, the CPU 101 increments the variable N (S403), and determines whether or not the value of the variable N is equal to a predetermined value (S404). Here, the predetermined value is a value for designating the number of times of processing in S402, and is set to 5 as an example here.

  When the determination result in S404 is NO, the CPU 101 changes the node to be the measurement start position in the next process of S402 (S405), and the process returns to S402.

  On the other hand, when the determination result in S404 is YES, the CPU 101 determines from the five distances (distance between two non-adjacent nodes) obtained by repeating the process of S402 five times by the processes of S401 to S405. The frequent value is obtained (S406). In S406, for example, as illustrated in FIG. 5, when the obtained five distances are 64 mm, 67 mm, 67 mm, 70 mm, and 67 mm, 67 mm is obtained as the mode value.

  Next, in the obtained five distances (distance between two non-adjacent nodes), the CPU 101 excludes distances that deviate from a certain range centered on the mode value obtained in S406 as abnormal values ( S407). Here, as an example, the range is a range of ± 2.5% of the mode value obtained in S406. For example, when the mode value is 67 mm as illustrated in FIG. 6, the range is 67 mm ± 2.5% (1.7 mm) (that is, 65.3 mm to 68.7 mm). Range), and distances outside this range (64 mm, 70 mm) are excluded as abnormal values. Note that ± 2.5% which is a threshold value defining this range is derived based on the following assumptions. As shown in FIG. 7, it is assumed that there are no nodes due to the display marks, the distance between the nodes is L, the shortest distance between the display marks (the shortest distance in the axial direction of the reinforcing bar) is L / 4, and one node Assuming that the threshold value for the minute distance is ½, that is, L / 4 × 1/2 = L / 8, for the distance of five nodes, (L / 8) /5L=0.025 Therefore, it becomes 2.5%.

  Next, in the obtained five distances (the distance between two non-adjacent nodes), the CPU 101 calculates the average value of the remaining distances excluding the distance excluded as an abnormal value in S407 for the two non-adjacent nodes. It calculates | requires as a distance between (S408). For example, as shown in FIG. 6, when the mode value is 67 mm and 64 mm and 70 mm are excluded as abnormal values, the average value (67 mm) of the remaining three distances (67 mm, 67 mm, 67 mm) ) Is determined as the distance between two non-adjacent nodes.

  Note that the inter-node distance calculation process shown in FIG. 4 is more specifically realized by the following process. First, the CPU 101 calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the extracted reinforcing bar image region. Next, the CPU 101 detects five pairs of two non-adjacent peaks from the luminance distribution, and calculates a distance between the two non-adjacent peaks of each of the five pairs. Here, two non-adjacent peaks are two peaks having four peaks between the two peaks. Next, based on the distance between the five pairs (the distance between two non-adjacent peaks), the CPU 101 determines a part of the five pairs (a constant value with the mode of the distance being the center value). The pair of distances out of the range is excluded, and the average of the distances of the remaining pairs is obtained as the distance between two non-adjacent nodes.

  When the inter-node distance calculation process is completed, the CPU 101 obtains information related to the distance between two non-adjacent nodes obtained by the process and the external storage device 104 or the like as illustrated in FIG. Information relating to the name and diameter of the reinforcing bar ("nominal diameter") stored in association with the portable recording medium 107 accommodated in the portable recording medium driving device 105 and between the two non-adjacent nodes of the reinforcing bar Information on the distance ("distance for five nodes") is output. For example, when this information is output to a display device connected to the input / output device 103, the information is displayed on the display screen of the display device as illustrated in FIG. Thereby, the user can specify the name and diameter of a reinforcing bar based on the displayed content. In the case of the example shown in FIG. 9, since the measured value of the distance for five nodes is 55.5 mm, the user names the corresponding reinforcing bar “D16” and the diameter “15.9”. Can be specified.

  Alternatively, when the above-described inter-node distance calculation process is completed, the CPU 101 obtains information related to the distance between two non-adjacent nodes obtained by the process and the external storage device 104 or portable recording associated with the distance. Information about the name and diameter of the reinforcing bar stored in the portable recording medium 107 accommodated in the medium driving device 105 is output. For example, when this information is output to a display device connected to the input / output device 103, the information is displayed on the display screen of the display device as illustrated in FIG. In this case, the name and diameter of the corresponding reinforcing bar are specified and displayed by the data calculation device 10.

  As described above, according to the data calculation device 10 according to the first embodiment, even when a rebar provided with a display mark is included in a captured image obtained by photographing a rebar to be inspected. The diameter or name of the reinforcing bar can be specified accurately.

  Next, modified examples of the data calculation apparatus 10 according to the first embodiment will be described with reference to FIGS. 11 to 13.

  FIG. 11 is a functional block diagram of the data calculation apparatus 10 according to the modification. FIG. 12 is a flowchart showing the flow of the internodal distance calculation process performed in the data calculation apparatus 10 according to the modification. FIG. 13 is a diagram illustrating an example of a plurality of average values.

  As shown in the functional block diagram of FIG. 11, in the data calculation device 10 according to the modification, the internode distance calculation unit 112 further includes an averaging unit 125, a luminance distribution calculation unit 121, an averaging unit 125, And the peak detection part 122 performs the following processes.

  The luminance distribution calculation unit 121 calculates the luminance distribution on a plurality of straight lines along the axial direction of the reinforcing bar from the reinforcing bar image region extracted by the extracting unit 111. The averaging unit 125 averages the luminance distributions on the plurality of straight lines calculated by the luminance distribution calculating unit 121. The peak detector 122 calculates a plurality of pairs of two peaks that are not adjacent from the luminance distribution averaged by the averaging unit 125. In FIG. 11, the rest is the same as in the first embodiment.

  As shown in FIG. 12, in the inter-node distance calculation process performed in the data calculation apparatus 10 according to the modification, the process of S402 shown in FIG. 4 is replaced with the process of S1202.

  In S1202, the CPU 101 measures the distance between two non-adjacent nodes from the extracted reinforcing bar image region a plurality of times (for example, twice) at different positions, and obtains an average value thereof. Here, the distance measured a plurality of times is a distance measured by changing the position of the same internode in a direction perpendicular to the axial direction of the reinforcing bar.

  As a result, the process of S1202 is repeated five times by the processes of S401, S1202, and S403 to S405, and five average values (64 mm, 67 mm, 67 mm, 70 mm, and 67 mm) illustrated in FIG. 13 are obtained. It is done. The example shown in FIG. 13 is an example in which each average value is an average value of two measurement values.

  In FIG. 12, in the subsequent processing, the same processing as the processing of S406 to S408 shown in FIG. 4 is performed on the five average values.

  More specifically, the inter-node distance calculation process shown in FIG. 12 is realized by the following process. First, the CPU 101 calculates a luminance distribution on a plurality of straight lines (for example, a plurality of straight lines that are not on the same straight line) along the reinforcing bar axial direction from the extracted reinforcing bar image region, and the luminance distribution on the plurality of straight lines. Is averaged. Next, the CPU 101 calculates five pairs of two non-adjacent peaks from the averaged luminance distribution. The subsequent inter-node distance calculation processing is the same as in the first embodiment.

Further, the processing after the internode distance calculation processing is the same as that in the first embodiment.
According to the data calculation device 10 according to such a modification, the diameter or the name of the reinforcing bar can be specified more accurately by performing the above-described averaging.
<Second Embodiment>

  The data calculation apparatus according to the second embodiment of the present invention is an apparatus for specifying the diameter or name of a reinforcing bar from a captured image obtained by imaging a reinforcing bar having a plurality of nodes, as in the first embodiment. It is also an example of a bar arrangement inspection support system. In the following description of the second embodiment, for convenience of explanation, the same components as those in the first embodiment will be described with the same reference numerals.

  Since the hardware configuration of the data calculation apparatus 10 according to the second embodiment is the same as that of the first embodiment, description thereof is omitted.

FIG. 14 is a functional block diagram of the data calculation apparatus 10 according to the second embodiment.
As illustrated in FIG. 14, the data calculation device 10 includes an extraction unit 111, an internodal distance calculation unit 112, a storage unit 113, and an output unit 114. Here, since the extraction unit 111, the storage unit 113, and the output unit 114 are the same as those in the first embodiment, the description thereof is omitted.

  The internode distance calculation unit 112 calculates a distance between two non-adjacent nodes of the reinforcing bar from the image area extracted by the extraction unit 111. More specifically, the internodal distance calculation unit 112 includes a luminance distribution calculation unit 121 and a correlation degree calculation unit 131.

  Similar to the first embodiment, the luminance distribution calculating unit 121 calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the reinforcing bar image region extracted by the extracting unit 111.

  The correlation degree calculation unit 131 calculates the degree of correlation according to the amount of movement in the axial direction of the rebar of the luminance distribution calculated by the luminance distribution calculation unit 121. More specifically, the luminance distribution calculated by the luminance distribution calculating unit 121 and the luminance distribution calculated by the luminance distribution calculating unit 121 are moved in the axial direction of the reinforcing bar in each amount of movement of the luminance distribution calculated by the luminance distribution calculating unit 121 in the axial direction of the reinforcing bar. The degree of correlation with the calculated one is calculated.

  Then, the internode distance calculation unit 112 calculates the distance between two non-adjacent nodes of the reinforcing bar based on the correlation degree calculated by the correlation degree calculation unit 131.

  Next, the flow of processing performed in the data calculation apparatus 10 according to the second embodiment will be described. In this processing flow, a process of extracting a reinforcing bar image area from a captured image obtained by photographing a reinforcing bar to be inspected, and a distance between two adjacent nodes of the reinforcing bar are calculated from the image area. Since processes other than the process (inter-node distance calculation process) are the same as those in the first embodiment, the description thereof is omitted. Here, only the inter-node distance calculation process will be described.

In the inter-node distance calculation process, the CPU 101 calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the reinforcing bar image area, and the degree of correlation according to the movement amount of the luminance distribution in the axial direction of the reinforcing bar. Is calculated. This degree of correlation can be calculated using, for example, the following equation (1).

In addition, this Formula (1) has shown the formula in the case of calculating the correlation degree of x and y.
Next, the CPU 101 calculates a distance between two non-adjacent nodes of the reinforcing bar based on the calculated degree of correlation.

  Here, an example in which the distance between two non-adjacent nodes of the reinforcing bar is calculated based on the calculated degree of correlation will be described. FIG. 15 is a diagram for explaining an example thereof.

  In the example shown in FIG. 15, the movement amount of the sixth peak (including the peak whose movement amount is “0”) in the calculated correlation degree (correlation coefficient) distribution is the distance of five nodes. It is an example calculated as (distance between two non-adjacent nodes). Here, the peak may be determined based on a predetermined threshold. In this case, for example, the predetermined threshold value may be an arbitrary value, or may be a value obtained from a moving average of correlation degrees from the viewpoint of removing noise of correlation degrees.

  As described above, the same effect as that of the first embodiment can be obtained also by the data calculation device 10 according to the second embodiment.

Next, a modified example of the data calculation apparatus 10 according to the second embodiment will be described.
FIG. 16 is a functional block diagram of the data calculation apparatus 10 according to the modification.

  As shown in the functional block diagram of FIG. 16, in the data calculation device 10 according to the modification, the internode distance calculation unit 112 further includes an averaging unit 132, a luminance distribution calculation unit 121, an averaging unit 132, The correlation calculation unit 131 performs the following process.

  The luminance distribution calculation unit 121 calculates the luminance distribution on a plurality of straight lines along the axial direction of the reinforcing bar from the reinforcing bar image region extracted by the extracting unit 111. The averaging unit 132 averages the luminance distribution on the plurality of straight lines calculated by the luminance distribution calculating unit 121. The correlation calculation unit calculates a correlation according to the amount of movement of the reinforcing bar in the axial direction of the luminance distribution averaged by the averaging unit 132. In FIG. 16, the rest is the same as in the second embodiment.

  Moreover, in the flow of processing performed in the data calculation apparatus 10 according to the modification, processes other than the inter-node distance calculation process are the same as those in the second embodiment. Therefore, only the inter-node distance calculation process will be described here.

  In the inter-node distance calculation processing, the CPU 101 calculates luminance distributions on a plurality of straight lines along the axial direction of the reinforcing bars from the reinforcing bar image area extracted from the captured image obtained by photographing the reinforcing bars to be inspected. The luminance distribution on the straight line is averaged. Next, the CPU 101 calculates a correlation degree according to the movement amount of the averaged luminance distribution in the axial direction of the reinforcing bar. The subsequent inter-node distance calculation processing is the same as in the second embodiment.

According to the data calculation device 10 according to such a modification, the diameter or the name of the reinforcing bar can be specified more accurately by performing the above-described averaging.
<Third Embodiment>

  The data calculation apparatus according to the third embodiment of the present invention is an apparatus for specifying the diameter or name of a reinforcing bar from a captured image obtained by photographing a reinforcing bar having a plurality of nodes, as in the first embodiment. It is also an example of a bar arrangement inspection support system. However, in the third embodiment, it is assumed that a photographed image obtained by photographing a reinforcing bar to be inspected indoors under a light source such as a work lamp is input to the data calculation device, and a display mark is displayed on the reinforcing bar in the photographed image. Is not provided. In the following description of the third embodiment, the same components as those in the first embodiment will be described with the same reference numerals for the convenience of description.

  Since the hardware configuration of the data calculation apparatus 10 according to the third embodiment is the same as that of the first embodiment, description thereof is omitted.

FIG. 17 is a functional block diagram of the data calculation apparatus 10 according to the third embodiment.
As illustrated in FIG. 17, the data calculation device 10 includes an extraction unit 111, an internodal distance calculation unit 112, a storage unit 113, and an output unit 114. Here, since the extraction unit 111, the storage unit 113, and the output unit 114 are the same as those in the first embodiment, the description thereof is omitted.

  The internode distance calculation unit 112 calculates a distance between two non-adjacent nodes of the reinforcing bar from the image area extracted by the extraction unit 111. More specifically, the internode distance calculation unit 112 includes a luminance distribution calculation unit 121, a peak detection unit 122, and a peak-to-peak distance calculation unit 123, and a plurality of pairs of distances calculated by the peak-to-peak distance calculation unit 123 ( The distance between two non-adjacent nodes of the reinforcing bar is calculated based on the minimum value in the distance between two non-adjacent peaks. Note that the luminance distribution calculation unit 121, the peak detection unit 122, and the peak-to-peak distance calculation unit 123 are the same as those in the first embodiment, and thus description thereof is omitted.

  Next, the flow of processing performed in the data calculation apparatus 10 according to the third embodiment will be described. In this processing flow, a process of extracting a reinforcing bar image area from a captured image obtained by photographing a reinforcing bar to be inspected, and a distance between two adjacent nodes of the reinforcing bar are calculated from the image area. Since processes other than the process (inter-node distance calculation process) are the same as those in the first embodiment, the description thereof is omitted. Here, only the inter-node distance calculation process will be described.

  In the internode distance calculation process, the CPU 101 calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the reinforcing bar image area. Next, the CPU 101 detects a plurality of (for example, five) pairs of two non-adjacent peaks from the luminance distribution, and calculates a distance between the two non-adjacent peaks of each of the plurality of pairs. Then, the CPU 101 calculates a distance that is the minimum value among the distances of the plurality of pairs (distance between two non-adjacent peaks) as a distance between two non-adjacent nodes.

  Here, the reason why the distance that is the minimum value among the distances of each of a plurality of pairs (the distance between two non-adjacent peaks) is calculated as the distance between two non-adjacent nodes is shown in FIG. I will explain. FIG. 18 is a diagram illustrating an example in the case where there is a light source such as a work lamp in the vicinity of the center of a reinforcing bar arranged indoors.

  As shown in FIG. 18, in such a case, the shadow of the node is generated longer as the node is farther from the light source 30 such as a work lamp. When a captured image obtained by capturing a reinforcing bar in such a state is input to the data calculation device 10, two non-adjacent peaks detected from the luminance distribution in the axial direction of the reinforcing bar in the image area of the reinforcing bar extracted from the captured image. May be longer than usual (state when there is no knot shadow) due to the effect of knot shadows. Therefore, in the third embodiment, the distance that is the minimum value among the detected distances between a plurality of pairs (the distance between two non-adjacent peaks) is calculated as the distance between two non-adjacent nodes. Therefore, the influence of the shadow of the node is eliminated as much as possible, and the distance between two non-adjacent nodes is calculated more accurately.

  As described above, according to the data calculation device 10 according to the third embodiment, even when a photographed image obtained by photographing a reinforcing bar to be examined under a light source such as a work lamp is input indoors. From the captured image, the diameter or name of the reinforcing bar can be accurately specified.

Next, a modification of the data calculation device 10 according to the third embodiment will be described.
FIG. 19 is a functional block diagram of the data calculation apparatus 10 according to the modification.

  As shown in the functional block diagram of FIG. 19, in the data calculation device 10 according to the modification, the internode distance calculation unit 112 further includes an averaging unit 141, a luminance distribution calculation unit 121, an averaging unit 141, And the peak detection part 122 performs the following processes.

  The luminance distribution calculation unit 121 calculates the luminance distribution on a plurality of straight lines along the axial direction of the reinforcing bar from the reinforcing bar image region extracted by the extracting unit 111. The averaging unit 141 averages the luminance distributions on the plurality of straight lines calculated by the luminance distribution calculating unit 121. The peak detector 122 calculates a plurality of pairs of two peaks that are not adjacent from the luminance distribution averaged by the averaging unit 141. In FIG. 19, the rest is the same as in the third embodiment.

  Further, in the processing flow performed in the data calculation apparatus 10 according to the modification, processes other than the inter-node distance calculation process are the same as those in the third embodiment. Therefore, only the inter-node distance calculation process will be described here.

  In the inter-node distance calculation processing, the CPU 101 calculates luminance distributions on a plurality of straight lines along the axial direction of the reinforcing bars from the reinforcing bar image area extracted from the captured image obtained by photographing the reinforcing bars to be inspected. The luminance distribution on the straight line is averaged. Next, the CPU 101 calculates a plurality of pairs of two non-adjacent peaks from the averaged luminance distribution. The subsequent inter-node distance calculation processing is the same as in the third embodiment.

  According to the data calculation device 10 according to such a modification, the diameter or the name of the reinforcing bar can be specified more accurately by performing the above-described averaging.

As described above, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, you may delete some components of all the components shown by embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
For example, in the data calculation device 10 according to each of the above-described embodiments, a still image may be input as a captured image, and one-shot measurement may be performed on the still image, or a moving image (real-time) may be performed as the captured image. Or a moving image to be captured) may be input, and real-time measurement may be performed on the moving image.
In addition, for example, in the internode distance calculation processing shown in FIGS. 4 and 12, the reference for excluding abnormal values may be an average value instead of the mode value. That is, in this case, an average value of a plurality of obtained distances may be obtained, and distances that are abnormal values may be excluded based on the average value.

10 Data Calculation Device 20 Reinforcing Bar 30 Light Source 101 CPU
102 Memory 103 Input / Output Device 104 External Storage Device 105 Portable Recording Medium Drive Device 106 Communication Device 107 Portable Recording Medium 108 Bus 111 Extraction Unit 112 Internode Distance Calculation Unit 113 Storage Unit 114 Output Unit 121 Brightness Distribution Calculation Unit 122 Peak Detection Unit 123 peak-to-peak distance calculation unit 124 pair exclusion unit 125 averaging unit 131 correlation degree calculation units 132 and 141 averaging unit

Claims (12)

From a captured image obtained by photographing a reinforcing bar having a plurality of nodes, a data calculation device for specifying the diameter or name of the reinforcing bar,
An extraction unit for extracting an image area of the reinforcing bar from the captured image;
An internodal distance calculation unit that calculates a distance between two non-adjacent nodes of the reinforcing bar from the image region extracted by the extraction unit;
A data calculation device comprising: The inter-node distance calculation unit
A luminance distribution calculating unit that calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the image region extracted by the extracting unit;
A peak detector for detecting two non-adjacent peaks from the luminance distribution calculated by the luminance distribution calculator;
A peak-to-peak distance calculation unit that calculates a distance between the two non-adjacent peaks detected by the peak detection unit;
Including
The internode distance calculation unit calculates a distance between two non-adjacent nodes of the reinforcing bar based on a distance between the two non-adjacent peaks calculated by the inter-peak distance calculation unit.
The data calculation apparatus according to claim 1. The two non-adjacent peaks detected by the peak detector are two peaks having a predetermined number of peaks between the two peaks,
The peak detection unit detects a plurality of pairs of the two non-adjacent peaks from the luminance distribution calculated by the luminance distribution calculation unit,
The inter-peak distance calculation unit calculates a distance between the two non-adjacent peaks of each of the plurality of pairs detected by the peak detection unit,
The internode distance calculation unit calculates a distance between two non-adjacent nodes of the reinforcing bar based on the distances of the plurality of pairs calculated by the inter-peak distance calculation unit.
The data calculation device according to claim 2. The inter-node distance calculation unit
A pair excluding unit that excludes some of the plurality of pairs based on the distances of the plurality of pairs calculated by the inter-peak distance calculating unit,
Further including
The inter-node distance calculation unit calculates a distance between two non-adjacent nodes of the reinforcing bar based on the distances of the plurality of pairs excluding the partial pairs excluded by the pair exclusion unit. ,
The data calculation device according to claim 3. The internode distance calculation unit calculates a distance between two non-adjacent nodes of the reinforcing bar based on a minimum value among the distances of the plurality of pairs calculated by the interpeak distance calculation unit. ,
The data calculation device according to claim 3. The luminance distribution calculating unit calculates a luminance distribution on a plurality of straight lines along the axial direction of the reinforcing bar from the image region extracted by the extracting unit;
The inter-node distance calculation unit
An averaging unit for averaging the luminance distributions on the plurality of straight lines calculated by the luminance distribution calculating unit;
Further including
The peak detection unit detects the two non-adjacent peaks from the luminance distribution averaged by the averaging unit.
The data calculation device according to claim 2. The inter-node distance calculation unit
A luminance distribution calculating unit that calculates a luminance distribution on a straight line along the axial direction of the reinforcing bar from the image region extracted by the extracting unit;
A degree of correlation calculation unit that calculates a degree of correlation of the luminance distribution calculated by the luminance distribution calculation unit according to the amount of movement in the axial direction;
Including
The inter-node distance calculation unit calculates a distance between two non-adjacent nodes of the reinforcing bar based on the correlation degree calculated by the correlation degree calculation unit.
The data calculation apparatus according to claim 1. The luminance distribution calculating unit calculates a luminance distribution on a plurality of straight lines along the axial direction of the reinforcing bar from the image region extracted by the extracting unit;
The inter-node distance calculation unit
An averaging unit for averaging the luminance distributions on the plurality of straight lines calculated by the luminance distribution calculating unit;
Further including
The correlation calculation unit calculates a correlation according to the amount of movement in the axial direction of the luminance distribution averaged by the averaging unit.
8. The data calculation apparatus according to claim 7, wherein A storage unit that stores the diameter or name of the reinforcing bar and the distance between two non-adjacent nodes of the reinforcing bar,
Information related to the distance between two non-adjacent nodes of the reinforcing bar calculated by the inter-node distance calculation unit, the diameter or name of the reinforcing bar stored in association with the storage unit, and the reinforcing bar An output unit that outputs information on a distance between two non-adjacent nodes;
The data calculation device according to claim 1, further comprising: A storage unit that stores the diameter or name of the reinforcing bar and the distance between two non-adjacent nodes of the reinforcing bar,
Information on the distance between two non-adjacent nodes of the reinforcing bar calculated by the internode distance calculation unit, and information on the diameter or name of the reinforcing bar stored in the storage unit in association with the distance And an output unit for outputting
The data calculation device according to claim 1, further comprising: From a photographed image obtained by photographing a reinforcing bar having a plurality of nodes, a data calculation method for specifying the diameter or name of the reinforcing bar,
Extract the rebar image area from the captured image,
From the extracted image area, a distance between two non-adjacent nodes of the reinforcing bar is calculated.
A data calculation method characterized by the above. From a photographed image obtained by photographing a reinforcing bar having a plurality of nodes, a data calculation program for specifying the diameter or name of the reinforcing bar,
Extract the rebar image area from the captured image,
From the extracted image area, a distance between two non-adjacent nodes of the reinforcing bar is calculated.
A data calculation program that causes a computer to execute the process.