JP4797059B2 - Steel bar counting device - Google Patents

Description

  The present invention relates to a steel bar counting device that counts the number of steel bars from a photographed image of one end face of a bundle of arbitrarily bundled steel bars.

  As a means of counting the number of steel bars in an arbitrary bundle for a bundled steel bar used in reinforced concrete structures, etc., a means for estimating the number of steel bars bundled based on the weight of a certain length of steel bar And means for counting the number of steel bars based on a photographed image of one end surface of the steel bars bundled.

  When counting the number of steel bars from the captured image of one end surface of a bundle of arbitrary steel bars, the irradiation light of the lighting device is reflected on one end surface of the steel bar and the captured image is acquired to obtain the It is possible to count the number in a state of being bound.

  In this case, the orientation of the end faces of the bundled steel bars (tilt of the end faces with respect to the axial direction of the steel bars) is not uniform (for example, vertical) but uneven due to various events that occur in the shearing cutting and binding process of the steel bars. When light is applied to the end face from the side, the direction of reflection is not uniform and uneven, and there is a problem in that missing measurement occurs in the image captured by the camera and causes a counting error.

Conventionally, as a steel bar counting technique by image processing, a rolling line primary counting unit that counts the number of bars after cutting and a rolling line secondary counting unit that counts the number of bars before binding are provided. There was a system (Patent Document 1). Further, as another counting means, the bar is illuminated, the illuminated array bar is photographed, and the photographed image is smoothed, thinned, laterally differentiated, expanded, and binarized. There is a counting means for performing each image processing and counting the number of bars from the image processed image (Patent Document 2).
JP 2005-78465 A JP 2003-216922 A

  As described above, when the number of steel bars is counted from the captured image of one end face of a bundle of arbitrary steel bars by reflecting the illumination light of the lighting device to one end face of the steel bar, the inclination of the end face with respect to the axial direction of the steel bar If there is an irregularity, there is a problem in that an image captured by the camera is missing and a counting error is caused.

  The present invention solves the above problems, and when counting the number of steel bars from the captured image of one end face of a bundle of arbitrary steel bars, the missing measurement rate with respect to the end face with an uneven direction, An object of the present invention is to provide a steel bar counting device that realizes a counting function with high reliability.

  The present invention is a steel bar counting device that counts the steel bars from a photographed image of one end face of a bundle of arbitrarily bundled steel bars, and scatter illumination is performed on one end face of the steel bar from a direction not parallel to the axial direction of the steel bars. An illumination unit, an opening for capturing an image of one end face of the steel bar, an optical path extending unit for transmitting the image to the image captured from the opening and extending the optical path, and an image that has passed through the optical path extending unit And an imaging camera for taking pictures.

  According to the present invention, when counting the number of steel bars from a photographed image of one end face of a bundle of arbitrarily bundled steel bars, it is possible to reduce the missing measurement rate with respect to the end faces having irregular directions and high reliability. A counting function can be realized.

  Embodiments of the present invention will be described below with reference to the drawings.

  The structure of the steel bar counting device according to the embodiment of the present invention is shown in FIGS. FIG. 1 is a perspective view showing an external configuration of a steel bar counting apparatus according to an embodiment of the present invention, FIG. 2 is a rear perspective view of the apparatus with a back panel removed, and FIG. 3 is a front view showing the external configuration of the apparatus. 4 is a rear view showing the internal configuration of the apparatus, FIG. 5 is a side sectional view showing the internal structure of the apparatus, and FIG. 6 is a block diagram showing the circuit configuration of the apparatus.

  The steel bar counting device according to the embodiment of the present invention is a steel bar counting device that counts steel bars from a photographed image of one end face of a bundle of arbitrarily bundled steel bars PA. The first lighting means 10 shown in FIGS. And the second illumination means 20 shown in FIG. 2 and FIG.

  The first illumination means 10 is tilted with respect to one end surface of the bundled steel bars PA to be measured (counted) in a direction not parallel to the axial direction of the steel bars PA, that is, the axial direction of the steel bars PA. This is an inclined illumination unit that performs scattered illumination from the direction. Hereinafter, this illumination unit is referred to as a low angle illumination unit. Irradiation light from the low-angle illumination unit 10 is indicated by reference numeral RB in FIG.

  The second illuminating means 20 is a straight illuminating means for illuminating one end surface of the bundled steel bars PA from a direction parallel to the axial direction of the steel bars PA, and is hereinafter referred to as a straight illumination section. The irradiation light of this straight illumination part 20 is shown by code | symbol RA in FIG.

  As shown in FIGS. 1, 3, and 5, the low-angle illuminating unit 10 surrounds a rectangular opening 2 provided in a front surface portion 1 </ b> A of a steel bar counting device main body (hereinafter referred to as “device main body”) 1. Is provided.

  As shown in FIGS. 2, 4, and 5, the straight illumination unit 20 communicates with the opening 2 and is provided inside the apparatus main body 1. The opening 2 constitutes an imaging window for capturing an image of one end face of the steel bar PA and an irradiation window of the straight illumination unit 20.

  The low-angle illumination unit 10 includes scattered light irradiation surfaces 10a, 10a,... Provided on the four sides around the opening 2 with a predetermined inclination angle extending outward, and scattering light sources 11, 11,. And is configured. Here, the scattered light irradiation surfaces 10a, 10a,... Are configured using a transparent or translucent acrylic plate. The scattering light sources 11, 11,... Are configured using LED light sources or fluorescent lamps in which a plurality of illumination LEDs are arranged in a straight line. The scattering light sources 11, 11,... Of the low-angle illumination unit 10 are switched according to a predetermined lighting / extinguishing pattern for each of the four sides by the lighting driving control of the control unit 7 (described later). Illuminance is switched for each side.

  The straight illumination unit 20 includes a box-shaped lamp frame 20F having opening surfaces W1 and W2 communicating with the opening 2, and a plurality of (here, 16) arranged in a matrix on the top surface of the lamp frame 20F. , And the half mirror 22 provided in the lamp frame 20F. The lamp frame 20F has opening surfaces W1 and W2 formed on two surfaces adjacent to each other, one opening surface W1 is communicated with the opening 2 of the apparatus main body 1, and the other opening surface W2 is located above the inside of the apparatus main body 1. Toward the main body 1. 16 LED light sources 21, 21,... Are arranged in a matrix on the top surface of the lamp frame 20 </ b> F facing the opening surface W <b> 1, and the light absorbing surface (S) is disposed on the bottom surface (bottom surface) facing the opening surface W <b> 2. ). The opening surface W1 constitutes an introduction window of a steel bar end face image for taking in an image of one end face (bar steel end face image) of the steel bar PA, and also constitutes an irradiation window of the LED light sources 21, 21,. The opening surface W2 constitutes a lead-out window for a bar steel end surface image that guides an image (bar end surface image) taken into the opening surface W1 and reflected by the half mirror 22 to an optical path extending means to be described later. Here, the illumination LED light sources 21, 21,... Are configured using blue LEDs. The half mirror 22 divides the inside of the box-shaped lamp frame 20F into the lamp frame 20F so as to be divided into a region serving as a transmission path for the steel bar end surface image formed with the opening surfaces W1 and W2 and a region for straight illumination. A mirror surface is formed diagonally. The half mirror 22 forms a right-angle transmission optical path (incident optical path of an image to be photographed) between the opening surfaces W1 and W2, as shown in FIG. Further, the half mirror 22 irradiates light emitted from the LED light sources 21, 21,... For illumination in a direction parallel to the axial direction (extending direction) of the steel bar PA except for light absorbed by the light absorption surface (S). An irradiation surface for straight illumination is formed.

  Further, an optical path extending means for transmitting an image of one end face (bar end face image) of the steel bar PA reflected by the half mirror 22 and led out from the opening surface W2 inside the apparatus main body 1 and extending the transmission optical path. (23-25) and the imaging camera 40 which image | photographs the image (steel bar end surface image) which passed through the optical path extension means are provided.

  The optical path extension means is provided in order to solve the problems (described later) due to missing measurements when shooting with a wide angle optical system from a short distance. By reflecting the optical path with a mirror several times, The optical path length is extended and the focal length (measurement distance) of the imaging camera 40 is increased in a limited space within the casing. Here, as a specific example of an actual machine, the optical path is extended by 5800 mm by three mirrors 23, 24 and 25. This optical path is indicated by reference numerals r1, r2, r3, and r4 in FIGS. Note that a problem caused by missing measurement when the image is taken with an optical system having a wide angle of view will be described later with reference to FIG.

  The imaging camera 40 is a color camera using a solid-state imaging device that captures an image of one end face of the steel bar PA (bar steel end face image) whose optical path has been extended by the optical path extending means. It inputs into the control part 7 mentioned later.

  On one side surface portion 1B of the apparatus main body 1, a display unit that displays, as a monitor image, an image of one end surface (bar end surface image) of the bundled steel bars PA taken by the operation panel 3 having a keyboard and a pointing device and the imaging camera 40. 4. An electronic cooler 6 using a Peltier device is provided, and a marker lamp 5 is provided on the upper surface.

  Inside the apparatus main body 1, as shown in FIG. 6, a control unit 7 having a CPU for controlling the operation of the apparatus in accordance with an operation instruction of the operation panel 3, and a low angle illumination unit 10 under the control of the control unit 7. Are driven to control the lighting of the scattering light sources 11, 11,..., And a lighting drive control unit 9 that controls the lighting of the LED light sources 21, 21,. Etc. are provided.

  The control unit 7 inputs an image photographed by the camera 40 and displays it as a monitor image on the display unit 4. Based on the image captured from the imaging camera 40, the control unit 7 determines the number of bundled steel bars PA by program processing. It has a processing function of counting, recording the count value, and displaying it on the display unit 4. Since the counting process using the image is not directly related to the requirements of the present invention, the description thereof is omitted here. Further, the control unit 7 controls the lighting drive control unit 8 in accordance with the operation instruction of the operation panel 3 so that the scattering light sources 11, 11,... Of the low-angle illumination unit 10 provided around the opening 2 are Control each side. Here, a plurality of illumination patterns are provided, and lighting of the light sources for scattering 11, 11,... Is controlled for each side by an illumination pattern selected according to an operation instruction on the operation panel 3. This illumination pattern is divided into a full lighting pattern, an illumination switching pattern, and an illuminance switching pattern, and a plurality of switching patterns are prepared for the illumination switching pattern and the illuminance switching pattern.

  In addition, the bundled steel bars PA to be measured (counted) by the steel bar counting device according to the embodiment of the present invention are attached to the front surface 1A of the steel bar counting device main body by a belt conveyor of a steel bar conveying path (not shown). One end surface is directed to the front surface 1A, and is conveyed at a predetermined distance. Further, the above-described apparatus main body 1 has a dust-proof glass (not shown) fitted in the opening 2 and a back panel is provided on the back surface to form a box-shaped sealed structure, and the heat generated inside the apparatus is Heat is radiated to the outside by an electronic cooler 6 provided on the side surface 1B of the main body 1.

  Here, with reference to said each figure, operation | movement of the bar counting device which concerns on embodiment of this invention is demonstrated. An arbitrary bundle of steel bars PA to be measured (counted) by the steel bar counting device is directed to the front surface 1A of the steel bar counting device main body and one end surface to the front surface 1A by a belt conveyor of a steel bar conveying path (not shown). Is transported at a distance of The low-angle illumination unit 10 scatters and irradiates one end surface of the steel bar PA with the irradiation light RB shown in FIG. 5 from the oblique oblique direction, and the straight illumination unit 20 is from a direction parallel to the axial direction of the bundled steel bar PA. One end surface is irradiated with the irradiation light RA shown in FIG. As a result, as shown in FIGS. 7 (1), (2), (3), and (4), there is an unevenness in the orientation of the end faces on one end face of the arbitrarily bundled steel bars PA. In addition, one end surface of all the steel bars PA is illuminated by the irradiation light RB. Further, as shown in FIGS. 7 (a), (b), (c), and (d), the axial displacement of the bundled steel bars PA (on the end faces) Even if there is irregularity due to unevenness, one end surface of all the steel bars PA is illuminated by the irradiation light RA with respect to the steel bars bundled in a state where the end faces are irregular in the axial direction. As a result, it is possible to eliminate the shadow (end face that is not illuminated) due to the uneven orientation of the end faces, and it is possible to eliminate the shadow due to the axial irregularities of the end faces. Further, since the straight illumination unit 20 uses blue LEDs that emit blue light for the LED light sources 21, 21,..., Blue oxidation is performed on the cut end (end face) by cutting at high temperature in steel bar shearing. When a film is generated and the end surface becomes dull blue, it becomes an illumination means that emphasizes the spectrum.

  An image of one end surface of the steel bar PA illuminated by the low-angle illumination unit 10 and the straight illumination unit 20 is taken into the apparatus main body 1 from the opening 2 and is deflected by the half mirror 22 as shown in FIG. The light is guided to the mirror 23 constituting the extending means via the optical path r1 shown in FIGS. The image guided to the mirror 23 is further guided to the mirror 24 via the optical path r2, guided to the mirror 25 via the optical path r3, and captured by the imaging camera 40 via the optical path r4. By interposing this optical path extending means, the missing rate can be reduced as compared with the case of direct imaging at the opening 2. This will be described with reference to FIG. For example, when the bundled steel bars PA shown in FIG. 7 have irregularities in which the directions of the end faces are not uniform as shown in (1), (2), (3), (4), the imaging camera 40 is opened. In the short-distance wide-angle shooting placed at the portion 2 (lower position in the figure), the end face of the steel bar (3) is hidden by the end face of the steel bar (2) and has a predetermined area (area determined as the steel bar) (3 ) Cannot be obtained. On the other hand, in photographing at a long distance with a long focal length when the imaging camera 40 is placed at a position (upper position in the drawing) extended by the optical path extending means (23 to 25), the end surface of the steel bar (3) is a steel bar (2 The end face image of the steel bar (3) having an area to be determined as a steel bar can be acquired. Further, the bundled steel bars PA shown in FIG. 7 have irregularities due to axial deviation (end surface irregularities) of the bundled steel bars PA, as shown by (a), (b), (c), and (d). In the case of a steel bar bundled in a state where the end surfaces are not aligned in the axial direction, in the short-distance wide-angle shooting where the imaging camera 40 is placed in the opening 2 (the lower position in the drawing), the steel bar (a) The end face is hidden by the end face of the steel bar (b), and an end face image of the steel bar (a) having a predetermined area (area determined to be a steel bar) cannot be acquired. On the other hand, in photographing at a long distance with a long focal length when the imaging camera 40 is placed at a position (upper position in the drawing) extended by the optical path extending means (23 to 25), the end surface of the steel bar (a) is a steel bar (b The end face image of the steel bar (a) having an area determined to be a steel bar can be acquired.

  As a result, as shown in (1), (2), (3), and (4), the bundled steel bars PA can reduce the missing measurement rate when the end faces are not uniform in orientation, When the bundled steel bar PA has irregularities due to axial deviation (unevenness of the end face) of the bundled steel bar PA, as shown in (a), (b), (c), (d), this end face Since the missing measurement rate can be reduced with respect to steel bars that are bundled in an axially irregular state, a highly reliable counting function can be realized.

  Furthermore, by switching the illumination pattern of the low-angle illumination unit 10 from an all-lighting pattern to an illumination pattern that performs lighting control for each side selected by an operation instruction on the operation panel 3, an end face image in an illumination direction different from the all-lighting pattern By combining these images or performing a logical operation, a more reliable counting function can be realized. For example, add a shot image of the end face with the top and left sides lit and a shot image of the end face with the bottom and right sides lit, and synthesize these images to the shot image of the end face with the full lighting pattern. A more reliable counting function can be realized by comparing the number of steel bars measured in step 1 with the number of steel bars measured on the captured image of the end face by all lighting patterns.

  Note that the components shown in the above drawings are not limited to the configurations shown in the drawings, and various modifications can be made without departing from the scope of the present invention. For example, in the above embodiment, the half mirror 22 provided in the opening 2 of the apparatus main body 1 forms an incident optical path for capturing an image to be photographed through the opening 2 and an irradiation surface for straight illumination. An optical system in which a light-receiving surface of a steel bar end face image is formed is arranged at the center of the opening 2, a plurality of LED light sources are arranged around the optical system, and the bar steel end face image is conducted to the optical path extending means by the optical system. Thus, an incident optical path for capturing an image to be photographed and an irradiation surface for straight illumination can be formed through the opening 2 without using a half mirror. Moreover, although the structure which used blue LED for the LED light source 21, 21, ... for illumination was illustrated in the said embodiment, it is not restricted to this, For example, it is suitable for acquisition of the end surface image of steel bar, for example, white, red, green, yellow LED light sources of other colors such as orange, or other lamp light sources may be used. Moreover, in the said embodiment, although the color camera was used for the imaging camera 40, a monochrome camera may be sufficient.

The perspective view of the appearance composition of the steel bar counter concerning the embodiment of the present invention. The perspective view seen from the back side which removed the back panel of the bar counting device concerning the above-mentioned embodiment. The front view which shows the structure of the steel bar counting device which concerns on the said embodiment. The rear view which shows the internal structure of the steel bar counting device which concerns on the said embodiment. The sectional side view which shows the internal structure of the steel bar counting device which concerns on the said embodiment. The block diagram which shows the circuit structure of the steel bar counting device which concerns on the said embodiment. Operation | movement explanatory drawing explaining the effect | action of the optical path extension means of the steel bar counting device which concerns on the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Steel bar counting device main body (device main body), 2 ... Opening part, 3 ... Operation panel, 4 ... Display part, 5 ... Indicator light, 6 ... Electronic cooler, 7 ... Control part, 8 ... Low angle illumination part lighting drive Control part, 9 ... Lighting drive control part of straight illumination part, 10 ... Inclined illumination means (low angle illumination part), 10a ... Scattered light irradiation surface, 11 ... Light source for scattering, 20 ... Straight illumination part, 20F ... Lamp frame, DESCRIPTION OF SYMBOLS 21 ... LED light source, 22 ... Half mirror, 23 ..., 24 ..., 25 ... Mirror (for optical path extension), 40 ... Imaging camera, PA ... Steel bar.

Claims (9)

A steel bar counting device that counts the steel bars from a photographed image of one end face of a bundle of optional steel bars,
Illumination means for performing scattered illumination from a direction not parallel to the axial direction of the steel bar on one end surface of the steel bar,
An opening for capturing an image of one end face of the steel bar;
An optical path extending means for transmitting an image taken from the opening and extending the optical path;
A steel bar counting apparatus comprising: an imaging camera that captures an image that has passed through the optical path extending means.   The bar lighting device according to claim 1, wherein the lighting means performs scattered lighting from four directions on one end face of the bar.   2. The bar counting apparatus according to claim 1, wherein the opening constitutes a rectangular imaging window, and the illumination means is provided around the imaging window.   The bar lighting device according to claim 3, wherein the illumination means is provided on four sides around the imaging window.   5. The bar counting apparatus according to claim 4, wherein the illumination unit includes a switching control unit that switches illumination for each side around the imaging window.   6. The bar counting apparatus according to claim 4, wherein the illuminating means includes illuminance control means for controlling illuminance for each side around the imaging window.   The bar counting apparatus according to any one of claims 3 to 6, further comprising auxiliary illumination means for illuminating the one end surface of the bar from the imaging window.   2. The bar counting apparatus according to claim 1, wherein the optical path extending means extends the optical path using a plurality of reflecting mirrors.   The auxiliary illumination means includes a half mirror provided in communication with the imaging window, and a straight that irradiates light from a direction parallel to the axial direction of the steel bar to the one end surface of the steel bar via the half mirror. The steel bar counting device according to claim 7, further comprising a light source for illumination.

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