JP5867210B2 - Reinforcing bar standard identification device and reinforcing bar standard information creation device - Google Patents

Description

  The present invention relates to an apparatus for discriminating a standard from an image of a reinforcing bar and an apparatus for creating reinforcing bar standard information used for discriminating the standard.

  At the construction site, the number of reinforcing bars, diameter, and pitch are measured by photographing the reinforcing bars of a reinforced concrete structure and processing the captured images with a computer (image processing). At that time, the rebar to be imaged (target rebar) usually overlaps with another rebar located behind and various backgrounds, so the image of the target rebar becomes unclear and the diameter measured as a result of image processing The accuracy such as length becomes worse. Therefore, in order to improve the accuracy of the measurement result by image processing, it is necessary to install a white board behind the object so that only the target reinforcing bar can be clearly photographed. Patent Document 1 discloses a bar arrangement information acquisition apparatus and method, and paragraph 0033 describes the installation of a white board.

JP 2010-122008

However, the bar arrangement information acquisition method of Patent Document 1 has the following problems.
(1) A white board cannot be inserted into a rebar with a small space unless its shape is devised. That is, a white board cannot be installed well behind the target reinforcing bar.
(2) It is necessary to affix a marker to the target reinforcing bar separately.
(3) It is difficult to measure both the main reinforcement and the reinforcement reinforcement with one white board.
(4) The shadow of the target rebar appears on the white board due to solar radiation or external illumination, and the rebar diameter may be measured incorrectly.

  As measures against the above problems, the present applicant has proposed the following method in Japanese Patent Application No. 2010-211111. First, as shown in FIG. 19A, the rotation angle (rib position) of the reinforcing bars is classified into three using the distribution of reinforcing bar diameters in the axial direction, and the reinforcing bars as shown in FIG. Reinforcing bar standard information that is a map of the diameter according to the rotation angle (range of reinforcing bar diameter for each nominal diameter) is created. Then, actually rebar is photographed, and based on the photographed image, the intermediate value of the rebar diameter distributed in the axial direction is calculated, the rebar standard information is referred to, and the intermediate value is the rebar diameter corresponding to the rotation angle. The nominal diameter included in the range is determined.

However, the above method for determining the diameter of the reinforcing bar has the following improvements.
(1) When there is a lot of noise (shadows or excessive solar radiation generated in the reinforcing bars) in the captured image, the accurate reinforcing bar diameter distribution may not be acquired, and the rib position of the reinforcing bars may not be correctly determined (see FIG. 20). If the rib position is wrong, the nominal diameter is determined using the wrong reinforcing bar diameter range in the reinforcing bar standard information of FIG. 19B, and there is a possibility that an incorrect result is obtained.
(2) When statistically processing the reinforcing bar diameter distribution, a predetermined number of samples or more are required. Therefore, since it is necessary to install a sufficiently wide background plate (see FIG. 21), workability may be deteriorated. On the other hand, if the bar arrangement pitch is narrow and there is little space for the background plate behind the reinforcing bar, the required number of samples may not be obtained.
(3) It is necessary to create reinforcing bar standard information for three patterns in accordance with the rotation angle of the reinforcing bar. Further, since the reinforcing bar diameter is not defined by JIS or the like, it is necessary to create reinforcing bar standard information after actual measurement.

  The present invention has been made in view of the above problems, and a main object thereof is to easily and accurately acquire reinforcing bar arrangement information.

In order to solve the above-mentioned problem, the present invention provides a reinforcing bar standard determining device that determines a standard from an image of a reinforcing bar, and includes reinforcing bar standard information indicating a range of the maximum diameter of the reinforcing bar for each standard related to the size of the reinforcing bar. Based on the reinforcing bar standard information, the means for storing, the means for acquiring an image obtained by photographing the diameter of the reinforcing bar including the braid, the means for acquiring the maximum diameter of the reinforcing bar from the acquired image, and the acquisition based on the reinforcing bar standard information Means for discriminating the standard from the maximum diameter.
According to this configuration, since the diameter of the deformed reinforcing bar becomes the maximum at the position with the knot in the axial direction, in order to obtain the maximum diameter, an image of the reinforcing bar diameter including at least one knot is obtained. Good. According to this, the width of the necessary reinforcing bar image in the axial direction is narrow, and image noise is less likely to occur by photographing a narrow range.

  And the maximum diameter changes with the rotation state of a reinforcing bar. Therefore, for each standard related to the size of the reinforcing bar, a range of the maximum diameter (minimum value to maximum value) corresponding to the rotation state is prepared in advance, and by specifying the range including the acquired maximum diameter of the reinforcing bar, Determine the standard. According to this, since the rotation state of the reinforcing bar that is actually subject to standard determination is not specified, there is no erroneous determination due to incorrect specification, and stability against noise can be increased.

In the reinforcing bar standard determination device of the present invention, when only one range including the acquired maximum diameter is specified based on the reinforcing bar standard information, the standard corresponding to the specified range is acquired. Then, based on the reinforcing bar standard information, the range including the acquired maximum diameter is not specified, or if the range is specified two or more, obtain an image obtained by photographing the reinforcing bar by changing the angle, The maximum diameter of the reinforcing bar may be acquired and the standard may be determined.
In the reinforcing bar standard information, the range of the maximum diameter of each standard of the reinforcing bars is not necessarily continuous sequentially, and there are vacant portions and overlapping portions. Therefore, if the maximum diameter of the reinforcing bar acquired from the captured image corresponds to a vacancy or overlapping portion in the reinforcing bar standard information, it is not possible to specify one standard regarding the dimensions of the reinforcing bar. In such a case, according to this configuration, the standard of the reinforcing bar can be specified as one by using the image re-taken by changing the angle.

Further, in the reinforcing bar standard discriminating apparatus of the present invention, the stored reinforcing bar standard information includes a range of the height of the knot for each of the standards, and further acquires the minimum diameter of the reinforcing bar from the acquired image, When the range including the acquired maximum diameter is uniquely specified based on the maximum diameter range, the standard corresponding to the specified range is acquired, and based on the maximum diameter range, When two ranges including the acquired maximum diameter are specified, the minimum diameter is subtracted from the acquired maximum diameter to calculate the height of the reinforcing bar, and based on the height range of the reinforcing bar. A range including the acquired maximum diameter based on the maximum diameter range by specifying any one of the standards corresponding to the two specified ranges from the calculated height of the knot. If is not specified, change the angle. The rebar acquires an image obtained by photographing the Te to obtain a maximum diameter and minimum diameter of the reinforcing bars, it is also possible to determine the standard.
According to this configuration, when two standards related to the size of the reinforcing bar are specified from the maximum diameter of the reinforcing bar, the height of the reinforcing bar is further obtained and collated with the range of the height of the reinforcing bar for each standard. Which of the two specified standards is applicable can be estimated. This eliminates the need for rebar photography.

In the above-mentioned reinforcing bar standard discriminating device of the present invention, the acquired image may be taken using a background plate.
According to this configuration, the necessary width of the reinforcing bar image in the axial direction can be reduced, so that the width of the background plate can be reduced and the workability is excellent. In other words, the background plate can be easily installed even at a location where the bar arrangement pitch is narrow.

  Further, the present invention is a reinforcing bar standard information creation device for creating reinforcing bar standard information indicating the range of the maximum diameter of the reinforcing bar for each standard relating to the size of the reinforcing bar, and for each standard, the reinforcing bar information excluding wrinkles and ribs Means for preliminarily storing a minimum diameter which is a diameter length; means for preliminarily storing a minimum height and a maximum height of the reinforcing bar for each standard; and for each standard, the minimum diameter and the minimum height. Means for acquiring the total value as the minimum value of the maximum diameter, and means for acquiring the total value of the minimum diameter and twice the maximum height as the maximum value of the maximum diameter for each standard. And means for generating and storing reinforcing bar standard information in which the standard is associated with the minimum value and the maximum value of the acquired maximum diameter.

  The maximum diameter of the reinforcing bar can be obtained at the position where there is a knot in the axial direction, but depending on the rotation state, the diameter including the minimum diameter and the height of one knot, the minimum diameter and the height of two knots It is between the diameter including the thickness. On the other hand, there is variation in the height of the knot, and the minimum height and the maximum height are determined for each name of the reinforcing bar (standard for dimensions) according to JIS standards. Therefore, the minimum value of the maximum diameter of the reinforcing bar is the sum of the minimum diameter and the minimum height of the knot. The maximum value of the maximum diameter of the reinforcing bar is the sum of the minimum diameter and twice the maximum height of the knot. According to this configuration, because the range of the maximum diameter is specified for each reinforcing bar standard based on the rotation state and the variation in the height of the knot, it is possible to unify the reinforcing bar standard information without distinguishing the rotating state of the reinforcing bar. Can do.

In the reinforcing bar standard information creating apparatus of the present invention, the minimum diameter stored in advance may be an average of the minimum diameters of reinforcing bars of each manufacturer for each standard.
According to this configuration, since there is data obtained by investigating the minimum diameter of the existing reinforcing bars manufactured by each manufacturer, the minimum diameter averaged for each standard is used. According to this, it can unify, without producing reinforcing bar standard information for every manufacturer of a reinforcing bar.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description of the mode for carrying out the invention and the drawings.

  According to the present invention, reinforcing bar arrangement information can be obtained easily and accurately.

It is a figure which shows the structure of the bar arrangement information acquisition system. 2 is a diagram showing a hardware configuration of a mobile terminal 4. FIG. 2 is a diagram illustrating a hardware configuration of a management server 5. FIG. It is a figure which shows the structure of the data memorize | stored in the bar arrangement information acquisition system 1, (a) shows the structure of the data memorize | stored in the memory | storage part 45 of the portable terminal 4, (b) is the memory | storage part of the management server 5 The structure of data stored in 55 is shown. It is a figure for demonstrating the maximum diameter of a deformed bar, (a) shows the rotation state and maximum diameter of a deformed bar, (b) shows the change of the maximum diameter of a deformed bar according to a rotation state. (A) is a figure which shows the JIS standard of the size, dimension, and shape of a deformed bar, (b) is a figure which shows the dimension of the minimum diameter of a deformed bar investigated for every manufacturer. It is a figure which shows the example of the reinforcement standard information 452 of the portable terminal. It is a flowchart which shows the imaging | photography method of a rebar image. 3 is a flowchart illustrating a first embodiment of image processing by the portable terminal 4; It is a flowchart which shows the reinforcement diameter estimation process by the portable terminal. It is a figure regarding the background board B, (a) shows the shape of the background board B, (b) shows the required background board width in the discrimination method of the reinforcing bar diameter using the maximum diameter, (c) is an example of a marker Show. It is a figure which shows the example of an actual deformed reinforcing bar. It is a figure for demonstrating the acquisition processing of the main reinforcement arrangement | positioning information, and shows the image which image | photographed the main reinforcement and the background board B. FIG. It is a figure for demonstrating the acquisition process of the main bar arrangement information, (a) shows the image which rotated the image of FIG. 13 only by -phi, (b) shows the figure for demonstrating a measurement principle. 6 is a flowchart showing a second embodiment of image processing by the portable terminal 4; It is a figure for demonstrating the acquisition processing of the reinforcement arrangement | positioning information of a main reinforcement and a reinforcement, (a) shows the image of the state which inserted the background board B between the main reinforcement and the reinforcement, and (b) is ( An image obtained by binarizing only the portion of the background plate B in the image a) is shown. It is a figure for demonstrating the reinforcement arrangement | positioning information acquisition of a main reinforcement and a reinforcement, and shows the image which rotated the recognized main reinforcement and the background board B by -phi clockwise among the images of Fig.16 (a). . It is a figure for demonstrating the acquisition processing of the reinforcement arrangement | positioning information of a main reinforcement and a reinforcement, Comprising: The image which rotated the recognized reinforcement and the background board B by -phi clockwise among the images of Fig.16 (a). Show. It is a figure for demonstrating the conventional discrimination | determination method of a reinforcing bar diameter, (a) shows the state definition of a deformed reinforcing bar, (b) shows the data structure of the reinforcing bar standard information according to a rib position. It is a figure which shows the example in case there are many noises of the extraction image of a reinforcing bar. It is a figure which shows the required background board width in the method using the conventional reinforcing bar diameter distribution. It is a flowchart which shows the reinforcement diameter estimation process (improved version) by the portable terminal. It is the figure which extracted the maximum diameter range of D29 and D32 from the reinforcing bar standard information 452 of FIG.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In the bar arrangement information acquisition system according to the embodiment of the present invention, in a construction site, a background plate with markers (patterns) attached to both ends is arranged behind the deformed reinforcing bars, and the markers at both ends and a gap between them are formed using a digital camera. Take a picture of the deformed reinforcing bar, use the mobile terminal (rebar arrangement information acquisition device) to obtain the reinforcing bar information such as the number, diameter length, and pitch (interval) of the deformed reinforcing bar from the photographed image, and type of each reinforcing bar from the distribution of diameter length (Standard, nominal diameter and nominal diameter). In particular, by making the background plate into a shape that can be inserted between the reinforcing bars and inserting the background plate diagonally, the diameters of the main bars and shear reinforcing bars (hereinafter simply referred to as “reinforcing bars”) are measured simultaneously. can do. In the present embodiment, the main bars are arranged in the vertical direction, and the reinforcing bars are arranged in the horizontal direction.

  Furthermore, the maximum diameter range (rebar standard information) that changes due to the rotation of the reinforcing bar is prepared in advance for each type of reinforcing bar using the minimum diameter survey data (reinforcing bar guideline) and the JIS standard for the height of the peg. Then, the maximum diameter is obtained from the actually captured image, and the type of the reinforcing bar is determined from the maximum diameter based on the reinforcing bar standard information.

  According to this, since the arrangement information can be easily and accurately acquired at the site, the correctness of the completed shape can be determined on the spot by comparing and collating with the design drawing information. And since the kind of reinforcing bar is discriminate | determined by the maximum diameter, without distinguishing the rotation state of a reinforcing bar, even if there exists noise, it can discriminate | determine stably.

≪System configuration and overview≫
FIG. 1 is a diagram illustrating a configuration of a bar arrangement information acquisition system 1. The bar arrangement information acquisition system 1 includes a digital camera 3 and a portable terminal 4 at a construction site, and a management server 5 at an office. Data can be transmitted / received between the digital camera 3 and the portable terminal 4 through a USB (Universal Serial Bus) cable or the like. Data can be transmitted and received between the portable terminal 4 and the management server 5 by wireless communication or the like.

  The digital camera 3 is used to take an image of the imaging target part 2 such as a pillar, a beam, a floor, or a wall including a reinforcing bar, and has a pixel count of, for example, 4 million pixels or more and can turn off the autofocus function. It is done. The portable terminal 4 is a portable information processing device, takes in a digital image taken from the digital camera 3 to generate reinforcement information, receives design drawing information from the management server 5, and arranges information and design drawing information. Are compared and checked to determine whether the finished shape is valid. The mobile terminal 4 may be replaced by a PC (Personal Computer) or a server. The management server 5 includes a storage unit 55 that stores design drawing information and construction photo information, and transmits and receives such information to and from the mobile terminal 4.

<< Device configuration >>
FIG. 2 is a diagram illustrating a hardware configuration of the mobile terminal 4. The portable terminal 4 includes a communication unit 41, a display unit 42, an input unit 43, a processing unit 44, and a storage unit 45. The communication unit 41 is a part that performs data communication with the digital camera 3 and the management server 5, and is realized by, for example, a USB port or a NIC (Network Interface Card). The display unit 42 is a part that displays data according to an instruction from the processing unit 44, and is realized by, for example, a liquid crystal display (LCD). The input unit 43 is a part where an operator inputs data (for example, data such as reinforcing bar standard information), and is realized by, for example, a keyboard or a mouse. The processing unit 44 delivers data between each unit and controls the entire mobile terminal 4 and is realized by a CPU (Central Processing Unit) executing a program stored in a predetermined memory. The The storage unit 45 stores data from the processing unit 44 and reads the stored data, and is realized by, for example, a nonvolatile storage device such as a flash memory or a hard disk device.

  FIG. 3 is a diagram illustrating a hardware configuration of the management server 5. The management server 5 includes a communication unit 51, a display unit 52, an input unit 53, a processing unit 54, and a storage unit 55. The communication unit 51 is a part that performs data communication with the portable terminal 4 via a wireless network, and is realized by, for example, a NIC or the like. The display unit 52 is a part that displays data in accordance with an instruction from the processing unit 54, and is realized by, for example, a liquid crystal display. The input unit 53 is a part where an operator inputs data (for example, data such as design drawing information), and is realized by, for example, a keyboard or a mouse. The processing unit 54 exchanges data between the units and controls the entire management server 5 and is realized by the CPU executing a program stored in a predetermined memory. The storage unit 55 stores data from the processing unit 54 and reads the stored data, and is realized by, for example, a nonvolatile storage device such as a flash memory or a hard disk device.

<< Data structure >>
FIG. 4 is a diagram illustrating a configuration of data stored in the bar arrangement information acquisition system 1. FIG. 4A shows a configuration of data stored in the storage unit 45 of the mobile terminal 4. The storage unit 45 stores an image processing program 451 and reinforcing bar standard information 452. The image processing program 451 is a program that acquires reinforcement information from image data captured by the digital camera 3 and performs a process of determining compatibility with the design drawing information. The processing unit 44 according to the necessity of the process. Is read from the storage unit 45 in response to the instruction. Reinforcing bar standard information (reinforcing bar type information) 452 is table information used for obtaining a standard (type) relating to the size of a reinforcing bar from the distribution of diameters. Details thereof will be described separately.

  FIG. 4B shows a configuration of data stored in the storage unit 55 of the management server 5. The storage unit 55 stores design drawing information 551 and construction photograph information 552 in advance. The design drawing information 551 is drawing information related to the design of a building such as a reinforcing bar (including the diameter of the deformed reinforcing bar), registered in the storage unit 55 by the administrator, and from the management server 5 to the portable terminal 4 as necessary. Sent to. The construction photo information 552 is photo information of a building at an actual construction site. Photo information taken by the digital camera 3 is transmitted to the management server 5 via the mobile terminal 4 and stored in the storage unit 55.

  FIG. 5 is a diagram for explaining the maximum diameter of the deformed reinforcing bar. The deformed reinforcing bar is a rod-shaped steel material having protrusions formed on the surface as a structural material of a building. As protrusions, knots and ribs are provided. The braid is provided with projections formed in a semicircular arc shape in the circumferential direction of the reinforcing bar at equal intervals in the axial direction. In the rib, protrusions formed at positions facing the radial direction of the reinforcing bar extend in the axial direction. In addition, FIG. 12 is a figure which shows the example of an actual deformed reinforcing bar. When viewed in a direction perpendicular to the axis of the reinforcing bar (taken), the appearance of the knots and ribs changes depending on the shooting direction around the axis, so the maximum diameter of the deformed reinforcing bar also changes. Hereinafter, the imaging direction of the deformed reinforcing bar is determined by the degree of rotation around the axis (hereinafter referred to as the rotating state) from a predetermined reference state (for example, state 1 in FIG. 5A described later) with respect to the imaging direction. It shall represent.

Fig.5 (a) shows the rotation state and maximum diameter of a deformed bar. FIG. 5B schematically shows a change in the maximum diameter of the deformed reinforcing bar according to the rotation state. The minimum diameter of the deformed reinforcing bar means the diameter of the reinforcing bar excluding the wrinkles and ribs, regardless of the photographed image, and is constant regardless of the rotation state. The maximum diameter is broadly divided into a diameter length in a state where a prick is visible on one side (states 1 and 2) and a diameter length in a state where a rib is visible on both sides (states 3 and 4). In a general deformed reinforcing bar, the height of the rib and the height of the knot are the same, so the maximum diameter of each state is calculated by the following formulas 1 and 2.
Maximum diameter in states 1 and 2 = minimum diameter + height of the lip ... Formula 1
Maximum diameter in states 3 and 4 = minimum diameter + heel height x 2 Equation 2

  On the other hand, Fig.6 (a) is a figure which shows the JIS specification of the size, a dimension, and shape of a deformed reinforcing bar, and the minimum value and the maximum value of the height of a braid are shown for every reinforcing bar size (name). FIG. 6B is a diagram showing the dimension of the minimum diameter of deformed reinforcing bars investigated for each manufacturer, and shows the average of six companies of the minimum diameter of each reinforcing bar size (name).

  Therefore, in the present embodiment, the minimum value of the maximum diameter according to the rotation state of the deformed reinforcing bar is the average height of the knot defined by JIS shown in FIG. 6 (a) and the minimum diameter shown in FIG. 6 (b). It is calculated from the above equation 1 using value data. The maximum value of the maximum diameter is calculated from Equation 2 using the height of the knot and the average value data of the minimum diameter. In this case, the maximum diameter of the deformed reinforcing bar can be defined in common regardless of the manufacturer as long as it is a general rib and knot shape.

Next, a method for creating a deformed reinforcing bar maximum diameter map (rebar standard information) will be described. Specifically, the range of the maximum diameter is calculated for each reinforcing bar size. The above formulas 1 and 2 are used to calculate the maximum diameter. However, the height of the knot is defined by the following formulas 3 and 4 using a ratio α (4%, 4.5%, 5%) to the nominal diameter according to the reinforcing bar size according to JIS. ing.
Maximum value of the height of the knot = nominal diameter x 2α
Minimum value of the foot height = nominal diameter x α
However, α = 4% (D6 to 13), 4.5% (D16), 5% (D19 to D51)

Therefore, the minimum value and the maximum value of the maximum diameter for each reinforcing bar size are calculated by the following formulas 5 and 6.
Minimum value = minimum diameter + minimum value of the height (nominal diameter d ′ × α): states 1, 2,.
Maximum value = minimum diameter + maximum value of the height (nominal diameter d ′ × 2α) × 2: states 3, 4,...

  The maximum diameter distribution is calculated for each reinforcing bar size by the above method, and a map is created. FIG. 7 is a diagram illustrating an example of the reinforcing bar standard information 452 of the mobile terminal 4. For example, it can be read that the maximum diameter range of the reinforcing bar size D6 is about 6 to 7 mm. The reinforcing bar standard information 452 may be tabular information indicating the minimum value and the maximum value of the maximum diameter in numerical values for each reinforcing bar size.

≪System processing≫
FIG. 8 is a flowchart illustrating a method for capturing a reinforcing bar image. In the construction site, a photographer photographs a reinforcing bar using the background board and the digital camera 3, transfers the photographed image to the portable terminal 4, and acquires reinforcement arrangement information from the photographed image using the portable terminal 4. The procedure is shown.

  First, the photographer determines the digital camera 3 (S801). At that time, it is confirmed whether the setting of 4 million pixels or more is possible and the autofocus function is cut off (S802). If the condition is not met (NO in S802), the digital camera 3 is selected again. Correct (S801). If the condition is met (YES in S802), the determined autofocus function of the digital camera 3 is turned off so that the focus is achieved at an appropriate distance (for example, 2 m) between the imaging target region 2 and the digital camera 3. (S803). Thereafter, the focal length is constant. Then, the calibration board is photographed and camera parameters are acquired (S804). This is called camera calibration, and detects distortion or the like of the digital camera 3 by photographing a board which is paper on which a lattice pattern or equally spaced dots are printed.

  Next, the photographer determines an imaging target part 2 including a reinforcing bar (S805), and inserts a background board behind the reinforcing bar (S806). In order to fix the background plate, it is conceivable to use a magnet or the like when only the main bar is present. On the other hand, when both the main bar and the reinforcing bar are present, it may be leaned between the intricate reinforcing bars.

  FIG. 11A shows the shape of the background plate B. FIG. The background plate B includes a plate material BA and markers MK1 and MK2. The plate material BA is a strip-shaped plate material used as a background when photographing a reinforcing bar, and a color (for example, white) different from that of the reinforcing bar is attached to at least one surface, and a reflective material is further attached. The reflective material is a material coated with a fluorescent paint or the like. According to this, when the reinforcing bar is flash-photographed, the shadow of the reinforcing bar is not reflected, and the image quality of the captured image is improved. Note that the fluorescent paint may be directly applied to the plate material BA.

Width _{T 1} of the plate BA, the pitch in the section deformed bars (e.g., 20 mm) from the large and spacing of reinforcement (e.g., 100 mm) smaller than, for example, is formed on 50 mm. On the other hand, the marker MK1 and MK2 is subjected to both ends of the plate BA, the width _{T 2} are, spacing reinforcement (e.g., 100 mm) smaller than, for example, is formed on 70mm or less.

According to this, the greater than the pitch of the width T ₁ Gafushi plate member BA, irrespective of the position of the background plate B, it can be captured in a state where one of Fushi is always present in front of the background plate B. Therefore, the maximum diameter length of the reinforcing bar can be measured while grasping the distribution of the knots. Then, since the size of the width T ₁ is limited, thereby shortening the calculation time. Further, since the width T ₂ of the width T ₁ and the marker MK1, MK2 plate member BA is smaller than the pitch of the reinforcement, without interfering with the reinforcement, easily the background plate B can be inserted into the reinforcing bars.

FIG.11 (b) shows the required background board width in the discriminating method of the reinforcing bar diameter using the maximum diameter. Since it is sufficient that at least one knot portion having the maximum diameter is included in the photographed image, the width T ₁ of the background plate B can be reduced.

  A marker is a characteristic shape that does not exist in nature, and its size (dimension) is known in advance, and it is per pixel from the size of the marker and the number of pixels in the marker in the captured image. , While recognizing the reinforcing bar between them by scanning between the two markers MK1 and MK2, and, further, between the imaging target region 2 and the digital camera 3 Used to estimate the distance between.

  FIG. 11C is a diagram illustrating an example of a marker. Cross markers and circular markers are shown. Since markers MK1 and MK2 are assigned to the background plate B and the background plate B is placed behind the reinforcing bar, the marker and the reinforcing bar at the same distance from the digital camera 3 can be photographed. Since the length per pixel is equal between the steel bar and the reinforcing bar, the diameter length and pitch can be obtained with high accuracy.

  Then, the object is photographed by the digital camera 3 from a position separated by an appropriate distance (for example, 2 m) (S807), the photographed image is transferred to the portable terminal 4, and image processing is executed (S808). The vertical angle in the shooting direction of the digital camera 3 is about 0 °, and the horizontal angle is arbitrary. Details of the image processing by the portable terminal 4 will be described later. After the image processing, the calculation result is displayed on the display unit 42 of the portable terminal 4 (S809). Then, if the calculation result is the reinforcing bar diameter and pitch of the design drawing information (YES in S810), it is determined that the bar arrangement state is normal, and the photographing operation is terminated. On the other hand, if the calculation result is not the reinforcing bar diameter or pitch in the design drawing information (NO in S810), the photographer instructs the worker on the site to correct the bar arrangement (S811). The target region 2 is determined again (S805), and imaging work is performed.

  FIG. 9 is a flowchart showing a first embodiment of image processing by the portable terminal 4. This process is performed when the portable terminal 4 acquires image data from the digital camera 3 and stores it in a built-in image memory. In this embodiment, processing when the imaging target region 2 is only the main muscle will be described.

  First, the portable terminal 4 calls an image processing program (S901). Specifically, the processing unit 54 reads the image processing program 451 from the storage unit 55, loads it into the main storage device (main memory), and positions the program counter (control pointer) at the start address of the image processing program 451. As a result, the processing unit 44 of the portable terminal 4 starts processing according to the image processing program 451. The processing flow is shown in S902 to S914.

  First, the portable terminal 4 (processing unit 44) acquires a digital image, a camera focal length FL [pixel], a reference length [mm] within the markers MK1 and MK2, and an inter-marker distance M [mm] (S902). A digital image is acquired from the digital camera 3 in the image memory via a USB cable. The camera focal length FL, the in-marker reference length, and the inter-marker distance M are acquired through the input unit 53 by a photographer's operation. The in-marker reference length is a reference length for the markers MK1 and MK2. For example, in the case of a circular marker, the length of the diameter of the circle is applied. Next, image correction and binarization are performed (S903). Specifically, digital camera distortion or the like is corrected using the camera parameters acquired in S804, and the corrected digital image is converted into a monochrome image with pixel value = 0 (black) or 1 (white).

  Subsequently, the portable terminal 4 measures, from the binarized image data, an angle formed by the main line S with the vertical line and an angle formed by the background board B with the horizontal line (S904). Referring to FIG. 13, a vertical line means a straight line parallel to the vertical direction of the pixel arrangement in the image memory IM, and a horizontal line means a straight line parallel to the horizontal direction of the pixel arrangement in the image memory IM. To do. The angle is positive in the clockwise direction. A rectangular region having a pixel value of 0 (black) extending in the vertical direction in the image memory IM is defined as a main line S, and a straight line parallel to the long side of the rectangle and passing through the center of the rectangle is a center line of the main line S. And the angle between the center line and the vertical line is θ. Further, a straight line passing through the centers of the markers MK1 and MK2 is extracted as the center line of the background plate B, and the angle between the center line and the horizontal line is φ.

  Subsequently, the portable terminal 4 rotates the original image clockwise by −φ, and makes the background plate B parallel to the horizontal line (S905). FIG. 14A is obtained by rotating the image of FIG. 13 by −φ, and the center line of the background plate B is parallel to the horizontal line.

Next, an image of only the background plate B is extracted (S906). In the upper part of FIG. 14B, an image obtained by extracting only the portion of the background plate B is shown. Then, the maximum number of pixels along the background plate B of the markers MK1 and MK2 is counted (S907). Specifically, the maximum diameter among the circular diameters that are markers is specified, and the number of pixels included in the diameter is counted. Then, the length per pixel is obtained by dividing the reference length in the marker by the number of pixels. According to this, by using a circular marker, the maximum diameter is constant no matter which direction the marker is viewed. Therefore, even if the orientation of the marker changes, the length per pixel can be accurately specified. . Further, distances L _m1 , L _m2 and L _H from the camera are obtained. (S908). As shown in FIG. 14B, the distance L _m1 is a distance between the camera and the marker MK1. The distance L _m2 is a distance between the camera and the marker MK2. The distance L _H is a camera, the shortest distance between the background plate B, it is used in calculating the camera, the distance between each reinforcing bar. Each distance is calculated | required by the following formula | equation 7,8,9.
L _m1 = FL × (reference length of marker MK1 / number of pixels of marker MK1) Equation 7
L _m2 = FL × (reference length of marker MK2 / number of pixels of marker MK2) Equation 8
L _H = √ (L _m1 ² − (L _m1 ² −L _m2 ² + M ² ) ² / 4M ² ) Equation 9

  Furthermore, the portable terminal 4 estimates the diameter of each main muscle (S909). By estimating the diameter of the main bar, the type of the reinforcing bar is specified. Details of this processing will be separately described as subroutine processing.

  Next, the portable terminal 4 acquires the coordinates (position), posture, and design drawing information of the digital camera 3 (S910). The coordinates of the digital camera 3 are acquired as position information given to the captured image by connecting a GPS (Global Positioning System) device, for example. The attitude of the digital camera 3 is acquired by a function (function of the digital camera 3 or connected device) that detects the camera attitude at the time of shooting. The design drawing information is acquired when the mobile terminal 4 receives the design drawing information 551 stored in the storage unit 55 of the management server 5. Then, the target part (construction part) of the photographed image is specified, and the compatibility with the corresponding design drawing information is determined (S911). For example, the compatibility between the estimated deformed reinforcing bar diameter and the deformed reinforcing bar diameter included in the design drawing information is determined.

  If the drawing is completed (YES in S912), the portable terminal 4 outputs the design drawing information and the recognition information to the display unit 42 (S913). The design drawing information is a target portion, coordinates, number, pitch, diameter length, etc. of the reinforcing bar on the drawing. The recognition information is the actual number of reinforcing bars, pitch, and diameter. If the drawing is not completed (NO in S912), the arrangement abnormality information indicating the abnormality content, the design drawing information, and the recognition information are output to the display unit 42 (S914). Note that the compatibility determination result can be transmitted to another device through the communication unit 41 instead of being output to the display unit 42.

  FIG. 10 is a flowchart showing a rebar diameter estimation process by the mobile terminal 4. This is a processing of a rebar diameter estimation subroutine including main bars and reinforcement bars in the image processing program. The continuous diameter length of each reinforcing bar is extracted from the binarized image data, and the diameter length data The maximum value is obtained, and the standard of the reinforcing bar is specified according to the maximum value.

  First, the portable terminal 4 extracts a continuous diameter [mm] corresponding to a position of 1 pixel in the vertical direction with respect to the background plate B (S1001). 14B, first, a pixel having a pixel value of 0 (black) is searched from a marker MK1 to MK2 at a predetermined position in a direction perpendicular to the background plate B, and along the background plate B having a reinforcing bar diameter. Obtain the number of pixels Wp. At that time, the number P of pixels along the background plate B between the reinforcing bars and the markers is also obtained. Here, the number of pixels between reinforcing bars, that is, the bar arrangement pitch, indicates the interval between the central axes of adjacent reinforcing bars, and is calculated as an average value of the number of pixels between the left edges and the number of pixels between the right edges, for example. The

Subsequently, the distance m along the background plate B between the reinforcing bar and the marker is obtained, the distance Lt from the camera to each reinforcing bar is obtained, and the reinforcing bar diameter Wm and the reinforcing bar pitch m ′ are obtained. For example, the reinforcing bar 2 in FIG. 14B can be obtained by the following formulas 10, 11, 12, and 13. In addition, Formula 12 and Formula 13 are calculation formulas regarding the main muscle. The reinforcement bars will be described later.
m ₂ = M × P ₂ / ΣPn (ΣPn: n = 1 to 6) Expression 10
L _t2 = √ (L _H ² + m ₂ ² ) Equation 11
W _m2 = W _P2 × L _t2 / FL × cos (φ + θ) Equation 12
m ₂ ′ = m ₂ × cos (φ + θ) Equation 13
When _obtaining L _t1 , P ₂ in Equation 10 is replaced with P ₁ + P ₂ . When _obtaining L _t3 , P ₂ in Equation 10 is replaced with P ₃ . When _calculating L _t4 , P ₂ in Equation 10 is replaced with P ₃ + P ₄ .

  Next, the mobile terminal 4 removes the abnormal value from the extracted diameter data (S1002). Specifically, the upper 5% data and the lower 5% data are removed from all the data of the reinforcing bar diameter distribution. This is because noise is likely to occur in the vicinity of the boundary between the background plate B and the portion that is not. And the maximum value in the data of 90% of remaining central parts among all the data of a reinforcing bar diameter distribution is specified, and it acquires as maximum diameter d1 (S1003).

  Subsequently, the mobile terminal 4 refers to the reinforcing bar standard information 452 in the storage unit 45 (S1004), and determines whether or not the reinforcing bar standard corresponding to the maximum diameter d1 can be specified (S1005). Referring to FIG. 7, for example, if the maximum diameter d1 is 6.5 mm, D6 can be specified as the reinforcing bar size. In this way, when the reinforcing bar standard can be specified (YES in S1005), the specified reinforcing bar standard is acquired (S1006). On the other hand, for example, if the maximum diameter d1 is 8 mm, neither D6 nor D10 is applicable, and the reinforcing bar size cannot be specified. That is, the maximum diameter of D6 is about 6 to 7 mm, the maximum diameter of D10 is about 9 to 10.5 mm, and d1 = 8 mm is not included in any range. When the reinforcing bar standard cannot be specified in this way (NO in S1005), a notification to that effect and a shooting instruction to change the shooting direction (rotation state) from the previous time are given to the operator, and the operator's operation corresponding to that is received. Thus, the rebar is photographed again and an image is extracted (S1007). At this time, the processes of S807 and S901 to S908 are actually performed. Thereafter, the process returns to S1001.

For example, if the maximum diameter d1 is 32 mm, D29 and D32 correspond to the reinforcing bar sizes. That is, since the maximum diameter of D29 is about 28.5 to 33 mm and the maximum diameter of D32 is about 31.5 to 36.5 mm, the range of about 31.5 to 33 mm overlaps, and d1 = 32 mm Is included in the overlapping range, and thus corresponds to both D29 and D32. Thus, when it corresponds to two rebar standards,
・ Rebar standards cannot be specified, so unconditionally retakes
・ Rebar standard is acquired as D29 or D32.
・ D29 or D32 is notified to the operator, and the angle is changed according to the operation of the operator, and re-shooting.
Various correspondences are conceivable. Actually, there are times when it is desired to know whether or not it is greater than or equal to D29, or whether or not it is less than or equal to D32. Therefore, even the notification of “D29 or D32” may be useful.

For example, if the maximum diameter d1 is 8 mm, it is between D6 and D10, and there is no applicable reinforcing bar size. When you are between two rebar standards like this,
・ Rebar standards cannot be specified, so unconditionally retakes
・ Rebar standard is acquired as D6 or D10.
・ Notify D6 or D10 and change the angle according to the operator's operation.
Various correspondences are conceivable. Actually, there are times when it is desired to know whether it is D6 or more or D10 or less, so even the notification of “D6 or D10” may be useful.

≪Processing when main bars and reinforcement bars coexist≫
FIG. 15 is a flowchart showing a second embodiment of the image processing by the portable terminal 4, and the processing of S1505 and S1511 to S1515 is added to the flowchart of FIG. In this embodiment, a description will be given of a process of discriminating between a main muscle and a reinforcing bar and acquiring respective bar arrangement information when the main bar and the reinforcing bar are mixed in the imaging target region 2.

  First, the portable terminal 4 calls an image processing program, acquires a digital image, a focal length, and the like, and binarizes the image, similarly to the processing in S901 to S904 in FIG. The angle θ is measured (S1501 to S1504). Subsequently, the pixel value binarized in S1503 is rotated clockwise by −θ so that the center line of the main muscle S is parallel to the vertical line, and only the portion of the background plate B is extracted. It is determined whether the area is 0 (black), which is the main reinforcing bar or the reinforcing bar (S1505). At this time, the number of reinforcing bars is known from the number of black areas.

  16-18 is a figure for demonstrating a process when a main reinforcement and a reinforcement reinforcement are mixed. FIG. 16A shows an image in a state where the background plate B is inserted obliquely between the main bars and the reinforcing bars, the angle between the main bars and the reinforcing bars is 90 °, and the center line of the main bars S is a vertical line. The angle between the center line of the background plate B and the horizontal line is φ. Next, FIG.16 (b) shows the image which extracted only the part of the background board B in the image of Fig.16 (a). In the area of the image where the pixel value is 0 (black), the location where the angle between the center line and the horizontal line is 90 ° is recognized as the main muscle, and Wspi (i = 1 to 5) is the diameter of the main muscle. On the other hand, a portion where the angle between the center line and the horizontal line is 0 ° is recognized as a reinforcing bar, and Whpj (j = 1, 2) is the diameter of the reinforcing bar.

  Next, the mobile terminal 4 rotates the main bar and the background plate B by −φ so that the center line of the background plate B is parallel to the horizontal line (S1506). FIG. 17 shows an image obtained by rotating the recognized main streak and the background plate B by −φ clockwise among the images in FIG. Then, when an image of only the background plate B is extracted (S1507), the image of the marker and the main streak as shown in the upper part of FIG. 14B is obtained, so that the process is similar to the processing of S907 to S909 of FIG. The diameter length and pitch of each main muscle are calculated (S1508 to S1510). Specifically, the calculation is performed according to Expressions 7 to 13. In Expressions 12 and 13, cos φ is used instead of cos (φ + θ).

  Subsequently, the mobile terminal 4 rotates the reinforcing bars and the background plate B by −φ so that the center line of the background plate B is parallel to the horizontal line (S1511). FIG. 18 shows an image obtained by rotating the recognized reinforcing bars and the background plate B by −φ clockwise among the images in FIG. Then, when an image of only the background plate B is extracted (S1512), the image of the marker and the reinforcing bar as shown in the upper part of FIG. 14B is obtained, and thus the same as the processing of S907 to S909 of FIG. Next, the diameter length and pitch of each reinforcing bar are calculated (S1513 to S1515). Specifically, the calculation is performed according to Expressions 7 to 13. In Expressions 12 and 13, sin φ is used instead of cos (φ + θ).

  Furthermore, the portable terminal 4 determines whether or not the calculated bar arrangement information is in accordance with the design drawing information, and outputs information according to the result (S1516 to S1520), similarly to the processing of S910 to S914 in FIG. ).

≪Another example of rebar diameter estimation process≫
FIG. 22 is a flowchart showing a rebar diameter estimation process by the mobile terminal 4. In the processing of the reinforcing bar diameter estimation subroutine shown in FIG. 10, when the reinforcing bar standard corresponding to the maximum diameter overlaps, it is determined which reinforcing bar standard is based on the height of the knot. Is. Note that the processing of S2201 to S2205 is the same as the processing of S1001 to S1005 except that the minimum diameter d3 is acquired together with the maximum diameter d1 in S2203. For details, see the description of S1001 to S1005 in FIG. That.

  First, the portable terminal 4 extracts a continuous diameter [mm] corresponding to a position of 1 pixel in the vertical direction with respect to the background plate B (S2201). Next, the mobile terminal 4 removes the abnormal value from the extracted diameter data (S2202). That is, the upper 5% data and the lower 5% data are removed from all the data of the reinforcing bar diameter distribution. Then, the maximum value and the minimum value in the data of the remaining central portion 90% are specified among all the data of the reinforcing bar diameter distribution, and are acquired as the maximum diameter d1 and the minimum diameter d3 (S2203).

  Subsequently, the mobile terminal 4 refers to the reinforcing bar standard information 452 in the storage unit 45 (S2004), and determines whether or not the reinforcing bar standard corresponding to the maximum diameter d1 can be specified (S2205). Referring to FIG. 7, for example, if the maximum diameter d1 is 6.5 mm, D6 can be specified as the reinforcing bar size. When the reinforcing bar standard can be specified in this way (YES in S2005), the specified reinforcing bar standard is acquired (S2206).

  On the other hand, for example, if the maximum diameter d1 is 8 mm, it does not correspond to either D6 or D10, and the reinforcing bar size cannot be specified. Further, if the maximum diameter d1 is 32 mm, both D29 and D32 are applicable as the reinforcing bar sizes, and the reinforcing bar sizes overlap, so that the reinforcing bar size cannot be specified. When the reinforcing bar standards cannot be specified in this way (NO in S2205), the mobile terminal 4 determines whether or not the reinforcing bar standards overlap in a region A in FIG. 23 described later (S2207). That is, it is determined whether or not the maximum diameter d1 is within the range of the region A in FIG. 23, and details thereof will be described later. If they do not overlap (NO in S2207), a notification that the reinforcing bar standard cannot be specified and a shooting instruction that the shooting direction (rotation state) should be changed from the previous time are given to the operator, and the operator's operation in response thereto is received. Then, the rebar is photographed again and an image is extracted (S2208). At this time, the processes of S807 in FIG. 8 and S901 to S908 in FIG. 9 are actually performed. Thereafter, the process returns to S2201.

  If they overlap in S2207 (YES in S2207), the portable terminal 4 calculates the height h of the knot (S2209). The height h of the knot is obtained by subtracting the minimum diameter d3 from the maximum diameter d1. Next, with reference to the range of the height of the knot in the overlapping reinforcing bar standards having the largest diameter (S2210), it is determined whether or not the height h of the knot is included in the range (S2211). ). If it is within the range (YES in S2211), the reinforcing bar standard having the larger maximum diameter is specified (S2212). If it is not within the range (NO in S2211), the rebar standard with the smaller maximum diameter is specified (S2213). Then, the specified reinforcing bar standard is acquired (S2206).

  According to FIG. 7, for example, if the maximum diameter d1 is 32 mm, two reinforcing bar sizes D29 and D32 are applicable. At this time, assuming that the height h of the collar is 3.0 mm, according to FIG. 6A, it is included in the range of the height of the collar 32 of D32, which has the larger maximum diameter, 1.6 to 3.2 mm. Therefore, D32 is specified as a reinforcing bar standard. On the other hand, if the height h of the collar is 1.5 mm, according to FIG. 6 (a), it is not included in the range of the height of the collar 32 of D32, so the one with the smallest maximum diameter. D29 is specified as a reinforcing bar standard.

  Next, when the reinforcing bar standard corresponding to the maximum diameter d1 is overlapped in the region A of FIG. 23 (YES in S2207), in the processing of S2209 to S2212, the larger one of the two largest reinforcing bar standards is the largest diameter. If it is included in the range of the height of the knot, the reason for specifying that it is a reinforcing bar standard having a larger diameter will be described.

  FIG. 23 is a diagram in which the maximum diameter range of D29 and D32 is extracted from the reinforcing bar standard information 452 of FIG. Hereinafter, as shown in FIG. 5, a state in which a paw is visible on one side (states 1 and 2) at a position where the radial length is maximum in the length direction of the reinforcing bar is referred to as “puffy”, and the radial length is the maximum. The state where the ribs can be seen on both sides at the position (states 3 and 4) is referred to as “ribs tend”. There are two regions A and B in the range where D29 and D32 overlap. Region A is a range in which the ribs of D29 and the tip of D32 overlap. Region B is a range in which the ribs of D29 and the ribs of D32 overlap. Note that D29 and D32 do not overlap.

The range of the maximum diameter (minimum value and maximum value) included in the mischievous region A is calculated by the following equations 14 and 15. As shown in FIG. 5 (b), the minimum diameter d2 indicates the diameter of the reinforcing bar excluding the knot and rib, D indicates the nominal diameter, and α indicates the ratio of the height of the knot to the nominal diameter. Indicates. The maximum diameter in the knotting is obtained by adding the height of the knot to the minimum diameter d2, and fluctuates according to the range of the knot height shown in the equations 3 and 4.
Minimum value = minimum diameter d2 + minimum value of the height of the foot (αD) (14)
Maximum value = minimum diameter d2 + maximum value of the height of the peg (2αD) Equation 15

  In S2209, the height h of the braid is obtained by the maximum diameter d1-the minimum diameter d3, and the maximum diameter d1 and the minimum diameter d3 are the diameters of the captured reinforcing bars. In the case of betting, the portion where the knot is visible on one side of the reinforcing bar is the maximum diameter, and the portion where the knot is not visible on both sides is the minimum diameter. 0). And according to Formulas 3 and 4, when the nominal diameter of the corresponding reinforcing bar standard is D and the ratio of the height of the knot height to the nominal diameter is α, αD ≦ h ≦ 2αD is established. On the other hand, if the ribs are prone, the ribs are visible on both sides of the reinforcing bar, so the theoretically the reinforcing bar diameter is constant and the maximum diameter d1 = minimum diameter d3. Height h≈0.

  According to the above, when the maximum diameter d1 is within the range of the region A, D29 cannot be pretending, and D32 is pretending to be either D29 rib. And if the height h of the foot is within the range of the height of the foot of D32, it is the footwear (D32), and if the height h of the foot is 0 or in the vicinity thereof, the hair tends to be rib (D29). Can be determined. In other words, if the height h is within the range of the height of the reinforcing bar standard (D32) having a larger maximum diameter, the reinforcing bar standard is satisfied, and if not, the maximum diameter is smaller. Corresponds to the steel bar standard (D29). For example, if the height h of the knot is 2.5 mm, 1.6 ≦ 2.5 ≦ 3.2, so it can be determined that the kink is D32. Further, if the height h of the knot is 0.2 mm, it is not included in 1.6 ≦ h ≦ 3.2, and therefore it can be determined that the rib of D29 is likely.

  On the other hand, when the maximum diameter d1 is in the range of the region B, both D29 and D32 tend to be ribs, and the height of the knot is h≈0. In this case, since re-imaging of the reinforcing bars is required, it is necessary to determine whether or not the maximum diameter d1 is within the range of the region A in the overlapping range in S2207.

  Although the embodiment of the present invention has been described above, in order to make each device of the bar arrangement information acquisition system 1 shown in FIG. 1 function, the program executed by the processing unit of each device is stored on a computer-readable recording medium. It is assumed that the bar arrangement information acquisition system 1 according to the embodiment of the present invention is realized by recording, causing the computer to read and execute the recorded program. Note that the program may be provided to the computer via a network such as the Internet, or a semiconductor chip or the like in which the program is written may be incorporated in the computer.

  According to the embodiment of the present invention described above, first, the background plate B in which the markers MK1 and MK2 and the white plate material BA are integrated may be inserted into the reinforcing bar. There is no need for a ruler with a scale, and there is less to set before shooting. Next, since the background plate B and the reinforcing bar are flash-photographed, the influence of the shadow of the reinforcing bar can be suppressed, so that erroneous measurement of the diameter length and the reinforcing bar pitch can be greatly reduced. By using one background plate B, it is possible to easily obtain the arrangement information of both the main reinforcement and the reinforcement.

  In particular, when estimating the rebar diameter and determining the name, the stability against noise is high regardless of the rotation state of the rebar. Next, as shown in FIG. 11 (b), in order to obtain the maximum diameter, it is sufficient that the knots appear at least once in the rebar axis direction, so the width of the background plate B can be reduced. Excellent workability. Therefore, the background plate B can be easily installed at a location where the bar arrangement pitch is narrow. A wide range of diameter distribution is not necessary, and it is only necessary to capture a narrow range including the maximum diameter.

  Furthermore, as shown in FIG. 7, it is possible to create reinforcing bar standard information specifying an approximate maximum diameter range for each name, regardless of the rotation state of the actually captured reinforcing bar. And even if the maximum diameter corresponds to the overlapping part of the reinforcing bar standard, it can be specified as one of the overlapping reinforcing bar standards based on the height of the stirrup, and the re-shooting is unnecessary. .

<< Other embodiments >>
Although the best mode for carrying out the present invention has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. For example, the following embodiments can be considered.
(1) In the above embodiment, the median value is acquired from the 1000 diameter length data in S903 of FIG. 9, but other representative values (for example, the mode value) are acquired. Also good.
(2) The marker is not limited to a circle, but may be a square when viewed from the front. Further, the number of markers is not limited to two at both ends of the plate material BA, but may be three or more at predetermined intervals in the longitudinal direction of the plate material BA. At this time, it is conceivable to select a reinforcing bar for which bar arrangement information needs to be acquired, specify two markers at a position sandwiching the selected reinforcing bar from a plurality of markers, and use the two markers.
(3) The angle formed by the main streak S with the vertical line and the angle formed by the background board B with the horizontal line were measured and used, but these angles are not limited to the vertical line and the horizontal line. If the angle with respect to the direction or the lateral direction is fixed, another reference line may be used, and not only the two reference lines for the main muscle S and the background plate B, but also one reference line may be used. .
(4) In the above-described embodiment, for example, as illustrated in FIG. 14B, the description has been made on the assumption that the camera and the background plate are facing each other (the optical axis of the camera and the background plate are orthogonal). In addition, even when the camera and the reinforcing bar and the background plate are not facing each other, for example, when the background plate is inclined in the depth direction with respect to the camera, the diameter length of the reinforcing bar is determined by the same formulas 7 to 13 as in the above embodiment. It is possible to measure.

DESCRIPTION OF SYMBOLS 1 Reinforcement information acquisition system 2 Image | photographing object part 3 Digital camera 4 Portable terminal (rebar standard discrimination device, rebar standard information creation device)
44 Processing unit 45 Storage unit 452 Reinforcing bar standard information 5 Management server B Background plate BA Plate material FL Focal length Lm, L _H , Lt Distance from camera MK1, MK2 Marker Wp Number of pixels

Claims (6)

A reinforcing bar standard discriminating device for discriminating a standard from a reinforcing bar image,
Means for storing in advance reinforcing bar standard information indicating a range of the maximum diameter of the reinforcing bar for each standard relating to the size of the reinforcing bar;
Means for obtaining an image of a diameter of the reinforcing bar including a braid;
Means for acquiring the maximum diameter of the reinforcing bar from the acquired image;
Based on the reinforcing bar standard information, means for determining the standard from the acquired maximum diameter,
A reinforcing bar standard discriminating apparatus comprising: The reinforcing bar standard determining device according to claim 1,
Based on the reinforcing bar standard information, when only one range including the acquired maximum diameter is specified, the standard corresponding to the specified range is acquired,
Based on the reinforcing bar standard information, when the range including the acquired maximum diameter is not specified, or when the range is specified two or more, an image obtained by photographing the reinforcing bar at different angles is acquired, and the reinforcing bar Reinforcing bar standard discriminating apparatus characterized in that the maximum diameter is obtained and the standard is discriminated. The reinforcing bar standard determining device according to claim 1,
The stored reinforcing bar standard information includes a range of wrinkle heights for each standard,
Further acquiring the minimum diameter of the reinforcing bar from the acquired image,
Based on the range of the maximum diameter, when the range including the acquired maximum diameter is uniquely specified, the standard corresponding to the specified range is acquired,
When two ranges including the acquired maximum diameter are specified based on the range of the maximum diameter, the height of the reinforcing bar is calculated by subtracting the minimum diameter from the acquired maximum diameter, Based on the height range of the knot, from the calculated knot height, specify one of the standards corresponding to the two specified ranges,
Based on the range of the maximum diameter, when the range including the acquired maximum diameter is not specified, obtain an image obtained by photographing the reinforcing bar by changing the angle, to acquire the maximum diameter and the minimum diameter of the reinforcing bar, Reinforcing bar standard discriminating apparatus characterized by discriminating the standard. Reinforcing bar standard discriminating device according to any one of claims 1 to 3,
The acquired image is photographed using a background plate. Reinforcing bar standard information creation device for creating reinforcing bar standard information indicating the range of the maximum diameter of the reinforcing bar for each standard relating to the size of the reinforcing bar,
Means for preliminarily storing a minimum diameter, which is the diameter length of the reinforcing bar excluding wrinkles and ribs, for each standard;
Means for preliminarily storing the minimum height and maximum height of the reinforcing bar for each standard;
For each standard, a means for obtaining a total value of the minimum diameter and the minimum height as a minimum value of the maximum diameter;
Means for obtaining a total value of the minimum diameter and twice the maximum height as the maximum value of the maximum diameter for each standard;
Means for generating and storing reinforcing bar standard information that associates the standard with the minimum value and the maximum value of the acquired maximum diameter;
Reinforcing bar standard information creation device characterized by comprising. The reinforcing bar standard information creation device according to claim 5,
The minimum diameter stored in advance is
Reinforcing bar standard information creation device characterized by averaging the minimum diameter of each manufacturer's reinforcing bar for each standard.