JP2010169432A - Passage detection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passage detection apparatus capable of detecting a passing object with a higher precision. <P>SOLUTION: The passage detection apparatus 100 has a pair of main bodies forming a pathway. The one body includes a first optical system 54, a first illuminating unit 1 configured with an elevation angle so as to have a different light axis from the light axis of the first optical system in the upper part of the first optical system, and second optical systems 51, each of the plurality of which is disposed along the passage direction of the pathway on the pathway side of the body. Also, the other body includes second illumination units 2, each of the plurality of which is disposed in plurality along the passing direction of the pathway on the passing side of the body. The passage detection apparatus 100 acquires an image by focusing the light received by the first optical system and the light received by the second optical system on each of the predetermined regions of a planar light receiving element 56. The passage detection apparatus 100 detects the passing state of the passing object based on the acquired image. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a passage detection device that detects an object passing through a predetermined location, for example.

  Currently, traffic control devices are used to manage traffic of people. The traffic control device is provided, for example, at an entrance / exit of a specific area such as a railway, an airport, or a facility. For example, an automatic ticket gate as a traffic control device reads an information storage medium possessed by a user and determines whether or not the user can pass. When it is determined that the passage is permitted, the automatic ticket gate opens the door to prompt the user to pass, and when it is determined that the passage is impossible, the door is closed to prevent the user from passing.

  In the automatic ticket gate, it is necessary to associate the owner of the information storage medium with the person whose traffic is controlled by the door. For this reason, an automatic ticket gate device provided with a plurality of sensors for detecting the passage state of a user and a moving object is provided on the passage side surface of the main body (see, for example, Patent Document 1).

JP 2008-14171 A

  The automatic ticket gate described above determines for each sensor whether a person or an object exists in the detection area. The automatic ticket gate determines that a person or an object exists when the brightness level acquired by the sensor is equal to or lower than a reference value. These sensors are used to pass through a passage formed by arranging the automatic ticket gates. They are arranged at predetermined intervals along the direction.

  The automatic ticket checker determines that the same person or object is detected by the respective sensors when the brightness below the reference value is detected by the adjacent sensors. As a result, the automatic ticket gate described above detects the position of the moving person or object.

  The automatic ticket gate described above includes a plurality of light receiving elements that receive light so as to correspond to the illumination units arranged horizontally. For this reason, when an illuminating unit is added to increase the number of points to be detected, it is necessary to add the same number of light receiving elements as the illuminating unit. For this reason, there exists a problem that cost increases.

  In order to simplify the configuration, a configuration in which light from each illumination unit is collectively received by an area camera is conceivable. However, according to this structure, it is necessary to install each illumination part so that it may project with respect to an area camera. For this reason, there may be a large number of blind spots between the illumination unit and the camera. Accordingly, there is a problem that it may not be possible to accurately detect that a person or an object has passed.

  Therefore, an object of the present invention is to provide a passage detection device that can detect passage with higher accuracy.

  A passage detection device according to an embodiment of the present invention is a passage detection device that detects a passing object passing through a passage formed between a pair of main bodies provided facing each other, and one of the pair of main bodies. A first optical system that is provided on the passage side of the main body and receives light from a predetermined range on the passage side, and the first optical system above the first optical system of the main body on the same side as the first optical system. The first illuminating unit provided with an elevation angle so as to have an optical axis different from the optical axis of the optical system and irradiating beam-shaped light, and the main body on which the first optical system is installed are the other side A plurality of second illumination units that are provided on the passage side of the main body along the passage direction of the passage and irradiate beam-like light; and the passage side of the main body on the same side as the first optical system, respectively. A plurality of light sources are provided along the passage direction of the passage, and receive light from the second illumination unit. A second optical system; a planar light-receiving element that converts received light into an image; and a light received by the first optical system and received by the second optical system, provided in front of the light-receiving element. An imaging system that forms an image on the light receiving element, and a detection unit that detects a passing state of the passing object based on an image converted by the light receiving element.

  In addition, a passage detection device according to an embodiment of the present invention is a passage detection device that detects a passing substance passing through a passage formed between a pair of main bodies provided to face each other, and includes both the pair of main bodies. A first optical system that receives light from a predetermined range on the passage side, and light that is different from the optical axis of the first optical system above the first optical system of both of the pair of main bodies. A plurality of first illumination units each provided with an elevation angle so as to have an axis, a plurality of first illumination units that irradiate beam-like light, and a passage direction of the passages on both passage sides of the pair of main bodies; A second illumination unit that irradiates beam-like light, and the second illumination unit that is provided in a plurality along the passage direction of the passages on both passage sides of the pair of main bodies and is installed on the facing body A second optical system for receiving light from the section, and the front A planar light-receiving element that is provided in both of the pair of main bodies and converts received light into an image, and a light received by the first optical system that is provided in front of each of the light-receiving elements, and the second light An imaging system that forms an image on the light receiving element with light received by an optical system; and a detection unit that detects a passing state of the passing object based on an image converted by each light receiving element.

  In addition, a passage detection device as an embodiment of the present invention is a passage detection device that detects a passing substance that passes through a passage formed between a pair of main bodies provided facing each other. A first optical system that is provided on the passage side of one of the main bodies and receives light from a predetermined range on the passage side, and the first optical system on the same side as the first optical system above the first optical system. A first illuminating unit that is provided with an elevation angle so as to have an optical axis different from the optical axis of the first optical system, and irradiates beam-like light; and a main body on which the first optical system is installed; A plurality of third illuminating units that irradiate beam-shaped light, and are provided on the same side of the main body on the side of the passage below the first optical system along the passage direction of the passage, and the third illumination unit And receive light from the range illuminated by the corresponding third illumination unit. A third optical system, a planar light-receiving element that converts received light into an image, and a light received by the first optical system and the third optical system provided in a preceding stage of the light-receiving element. An imaging system that forms an image of the received light on the light receiving element; and a detection unit that detects a passing state of the passing object based on an image converted by the light receiving element.

  In addition, a passage detection device according to an embodiment of the present invention is a passage detection device that detects a passing substance passing through a passage formed between a pair of main bodies provided to face each other, and includes both the pair of main bodies. A first optical system that receives light from a predetermined range on the passage side, and light that is different from the optical axis of the first optical system above the first optical system of both of the pair of main bodies. A first illuminating unit that is provided with an elevation angle so as to have an axis and irradiates beam-shaped light, and each of the passages on the passage side below the first optical system of both the pair of main bodies. A plurality of illumination units that are provided along the direction of travel, irradiate beam-shaped light, and provided in the vicinity of each of the third illumination units, and from a range illuminated by the corresponding third illumination unit. Both the third optical system that receives light and the pair of main bodies A planar light receiving element that converts received light into an image, and light received by the first optical system and light received by the third optical system, provided in front of each of the light receiving elements. An image forming system that forms an image on the light receiving element, and a detection unit that detects a passing state of the passing object based on an image converted by each light receiving element.

  According to one aspect of the present invention, it is possible to provide a passage detection device that can detect passage with higher accuracy.

FIG. 1 is a block diagram for explaining a configuration example of a passage detection apparatus according to the first embodiment. FIG. 2 is an explanatory diagram for explaining an example in which a person passes through a passage formed by the passage detection device shown in FIG. FIG. 3 is a diagram showing an overview of the passage detection apparatus shown in FIG. FIG. 4 is an explanatory diagram for describing image processing performed by the image processing unit. FIG. 5 is a top view of a passage formed by a pair of traffic control devices. FIG. 6 is a view of a passage formed by a pair of traffic control devices as viewed from the direction of travel. FIG. 7 is an explanatory diagram for describing a configuration example of the imaging unit illustrated in FIGS. 1 and 3. FIG. 8 is an explanatory diagram for describing an example of an image captured by the traffic control device illustrated in FIG. 1. FIG. 9 is a view of a passage formed by a pair of traffic control devices as viewed from the direction of travel. FIG. 10 is a flowchart for explaining the operation of the traffic control device shown in FIG. FIG. 11 is a diagram illustrating an overview of another example of the traffic control device. FIG. 12 is a diagram illustrating an overview of still another example of the traffic control device. FIG. 13 is a diagram illustrating an overview of still another example of the traffic control device. FIG. 14 is a diagram illustrating an overview of still another example of the traffic control device. FIG. 15 is a block diagram for explaining a configuration example of the passage detection apparatus according to the second embodiment. FIG. 16 is a diagram illustrating an overview of the passage detection device illustrated in FIG. 15. FIG. 17 is a top view of a passage formed by a pair of traffic control devices. FIG. 18 is a view of a passage formed by a pair of traffic control devices as viewed from the direction of travel. FIG. 19 is an explanatory diagram for describing a configuration example of the imaging unit illustrated in FIGS. 17 and 18. FIG. 20 is an explanatory diagram for describing an example of an image captured by the traffic control device illustrated in FIG. 15. FIG. 21 is a top view of a passage formed by a pair of traffic control devices. FIG. 22 is a view of a passage formed by a pair of passage control devices as viewed from the passage direction. FIG. 23 is an explanatory diagram for describing an example of an image captured by the traffic control device illustrated in FIGS. 21 and 22. FIG. 24 is an explanatory diagram for describing an example of an image captured by the traffic control device illustrated in FIGS. 21 and 22.

  Hereinafter, a passage detection device according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram for explaining a configuration example of the passage detection apparatus 100 according to the first embodiment.

  As illustrated in FIG. 1, the passage detection device 100 includes a first illumination unit 1, a second illumination unit 2, an illumination control unit 4, an imaging unit 5, an imaging control unit 6, an image input unit 7, and an image processing unit 8. And a control unit 9 and the like. The image input unit 7, the image processing unit 8, and the control unit 9 are connected to each other via a bus 10 or the like.

  FIG. 2 is an explanatory diagram for explaining an example in which a person passes through a passage formed by the pair of main bodies 101 and 102 of the passage detection device 100 shown in FIG.

  FIG. 3 is a diagram illustrating an overview of the passage detection device 100 illustrated in FIG. 1.

  As shown in FIG. 3, the first illumination unit 1 is installed on the passage side of one main body 101 of the passage detection device 100. The 1st illumination part 1 is comprised by the Light Emitting Diode (LED) etc. which emit the near infrared light which has directivity, for example. The 1st illumination part 1 is installed in the channel | path side of one main body 101 of the passage detection apparatus 100 in the state with an elevation angle. That is, the first illumination unit 1 emits near infrared light having directivity at a predetermined angle.

  In addition, the 1st illumination part 1 is provided with the condensing lens. The light emitted from the first illumination unit 1 is collected by a condenser lens. The light emitted from the first illuminating unit 1 is in the form of a beam having an irradiation range radius of about several centimeters at the maximum distance (about the width of the passage formed by the pair of main bodies 101 and 102).

  The second illumination unit 2 is arranged in a plurality of horizontally on the passage side of the other main body 102 opposite to the main body 101 on which the imaging unit 5 is installed and below the installation position of the imaging unit 5 Installed at. The second illumination unit 2 includes, for example, a light emitting diode (LED) that emits near-infrared light having directivity. A plurality of second illumination units 2 are arranged horizontally along the passage direction of the passage formed by the pair of main bodies 101 and 102. That is, the 2nd illumination part 2 emits near infrared light which has directivity toward one main body 101 of a facing side horizontally.

  In addition, the 2nd illumination part 2 is provided with the condensing lens etc., for example. In this case, the light emitted from the second illumination unit 2 is collected by the condenser lens. The light emitted from the second illuminating unit 2 is in the form of a beam having an irradiation range radius of about several centimeters at the maximum distance (about the width of the passage formed by the pair of main bodies 101 and 102). The 2nd illumination part 2 provided with a condensing lens is installed in the direction in which the emitted light injects into the light-receiving part 51 shown in FIG.

  Note that the second illumination unit 2 may include a diffusion plate instead of the condenser lens. In this case, the light emitted from the LED is diffused by the diffusion plate and enters the light receiving portion 51 of the main body 101 on the facing side.

  The illumination control unit 4 controls the lighting timing and irradiation intensity of the first illumination unit 1 and the second illumination unit 2. The illumination control unit 4 includes, for example, an electric board on which a counter IC is mounted. The illumination control unit 4 controls the timing at which the illumination is turned on by switching between ON and OFF of the current flowing through the first illumination unit 1 and the second illumination unit 2. Moreover, the illumination control part 4 can change the emitted light intensity of illumination by adjusting an electric current value.

  As illustrated in FIG. 3, the imaging unit 5 is installed in the passage-side main body of one main body 101 of the passage detection device 100. The imaging unit 5 is configured by, for example, a camera. The imaging unit 5 includes, for example, an area image sensor (light receiving element) such as a CCD or a CMOS, an optical system such as a lens, and an imaging system. The imaging unit 5 causes the light received by the optical system to form an image on the area image sensor using the imaging system.

  The area image sensor includes a plurality of pixels arranged two-dimensionally. Each pixel of the area image sensor converts the received light into an electrical signal, that is, an image, and outputs it as a digital signal. When the camera included in the imaging unit 5 is an analog camera, for example, the signal is digitized by an A / D converter and output.

  The imaging unit 5 includes an optical fiber 52 and a light receiving unit 51 as an optical system. As shown in FIG. 3, the light receiving units 51 are installed in a state where a plurality of light receiving units 51 are arranged horizontally on the passage-side surface of one main body 101 of the passage detection device 100. The light receiving unit 51 and the optical fiber 52 are optically connected. The light receiving unit 51 is, for example, an end of the optical fiber 52.

  The optical fiber 52 propagates light. Further, the other end of the optical fiber 52 is connected to the imaging unit 5. That is, the light received by the light receiving unit 51 is propagated into the imaging unit 5 through the optical fiber 52. The light propagated in the imaging unit 5 is irradiated to a part of the area image sensor through the optical system and the imaging system. The configuration of the imaging unit 5 will be described in detail later.

  The imaging control unit 6 controls the timing of imaging by the imaging unit 5. The imaging control unit 6 controls the gain of the area image sensor of the imaging unit 5 and the like. When a plurality of cameras are used, the imaging control unit 6 can keep the cameras synchronized by sharing the horizontal synchronization signal and the vertical synchronization signal of each camera. The simultaneity of the imaging control unit 6 can be realized, for example, by distributing a synchronization signal by a pulse generator. In addition, the imaging control unit 6 performs imaging by the imaging unit 5 in synchronization with the timing of illumination by the first illumination unit 1 and the second illumination unit 2 by synchronizing the signal with the illumination control unit 4. Can do.

  The image input unit 7 sequentially captures images acquired by the imaging unit 5. The image input unit 7 includes, for example, a memory that temporarily stores an image, a timing signal generation unit, and the like. The timing signal generator generates a timing signal for controlling timing for capturing an image.

  The image processing unit 8 performs various image processing on the image input by the image input unit 7. For example, the image processing unit 8 performs binarization processing and labeling processing on the input image. Further, the image processing unit 8 specifies the center of gravity of each area labeled by the labeling process.

  The control unit 9 comprehensively controls the operations of the illumination control unit 4, the imaging control unit 6, and the image processing unit 8. The control unit 9 includes a memory that functions as a storage unit. The memory is composed of, for example, a ROM, a RAM, and a nonvolatile memory. The ROM stores a control program, control data, and the like in advance. The RAM functions as a working memory and temporarily stores data being processed by the control unit 9. The nonvolatile memory stores the processing result of the apparatus.

  The control unit 9 calculates the distance from the imaging unit 5 to the object based on the position of the center of gravity specified by the image processing unit 8. Thereby, the passage detection device 100 calculates the width of the person or the object passing through the passage.

  FIG. 4 is an explanatory diagram for describing image processing performed by the image processing unit 8. FIG. 4A is a diagram illustrating an example of an input image input from the image input unit 7. When an image as shown in FIG. 4A is input, the image processing unit 8 performs binarization processing on the input image. In other words, the image processing unit 8 compares the threshold value stored in a memory (not shown) with the value of each pixel of the input image, and determines that the pixel less than the threshold is “0 (dark)” and the pixel that is equal to or greater than the threshold is “1 ( Replace with “Akira)”.

  In addition, the location where the irradiation light from the first illumination unit 1 is reflected by the person passing through the passage and the location illuminated by the second illumination unit 2 are “bright”, and the other A threshold is set in the memory so that the location is “dark”. By the above binarization processing, an image as shown in FIG. 4B is obtained. FIG. 4B is a diagram illustrating an example of an image that has been binarized.

  Next, the image processing unit 8 performs a labeling process on the binarized image. That is, the image processing unit 8 finds one pixel that is “bright” in the image shown in FIG. 4B and has no label added thereto, and adds a label. The image processing unit 8 adds the same label to the “bright” pixels among the four neighboring pixels connected to the labeled pixels.

  By performing this process on the entire image, “bright” regions (bright spots) are classified as groups. With the labeling process described above, data as shown in FIG. 4C is obtained. FIG. 4C is a diagram illustrating an example of label information added to each pixel by the labeling process. In the figure, four areas are detected as bright spots.

  In the present embodiment, the labeling process is performed so as to add a label to pixels in the vicinity of four “bright” pixels. However, the present invention is not limited to this. The labeling process may be performed in any range. Since the pixels may vary depending on the size of the illumination, the uniformity of the illumination light, the influence of noise, etc., the range for the labeling process should be set as appropriate, for example, around 8 pixels or around 24 pixels. Can do.

  The image processing unit 8 performs a centroid calculation process for calculating the centroid of each bright spot based on the label information. That is, the image processing unit 8 obtains the coordinates (center of gravity) of the center of each bright spot based on the coordinates and the number of pixels of each pixel in the area.

  FIG. 4D is a diagram illustrating an example of one region classified by the labeling process. As shown in FIG. 4D, there are five pixels in the classified area. When the coordinates of the center of gravity of this area are (Xc, Yc), the coordinates of each pixel in the area are (Xi, Yi), and the number of pixels in the area is n, the following formulas 1 and 2 are established.

  The center of gravity (Xc, Yc) can be specified by Equation 1 and Equation 2 above.

  Next, how to obtain the distance from the apparatus to the object will be described. In the present embodiment, a method for obtaining the distance from the apparatus to the object using the principle of triangulation will be described, but the method for obtaining the distance may be any other method.

5 and 6 are explanatory diagrams for explaining an example in which an object (person) passes through a passage formed by a pair of main bodies 101 and 102. FIG.
FIG. 5 is a view of a passage formed by the pair of main bodies 101 and 102 as viewed from above. FIG. 6 is a view of a passage formed by the pair of main bodies 101 and 102 as viewed from the passing direction.

  As shown in FIGS. 5 and 6, the light emitted by the second illuminating units 2 installed on the passage side of the main body 102 is incident on the light receiving unit 51 of the main body 101 facing each other. The light incident on the light receiving unit 51 is introduced into the imaging unit 5 through the optical fiber 52. Further, the optical system of the imaging unit 5 receives light from at least a range illuminated by the first illumination unit 1.

  In the example shown in FIGS. 5 and 6, a person is present within the imaging range of the imaging unit 5. That is, since a person exists between the second illumination unit 2 and the imaging unit 5, the light from the second illumination unit 2 is blocked by the person. Furthermore, the 1st illumination part 1 is irradiating a person.

  FIG. 7 is an explanatory diagram for describing a configuration example of the imaging unit 5 illustrated in FIGS. 1 and 3. As shown in FIG. 7, the imaging unit 5 includes a light receiving unit 51, an optical fiber 52, a lens 53, a lens 54, a half mirror 55, and an area image sensor 56.

  The light receiving unit 51 is an end of the optical fiber 52. The light receiving unit 51 receives light and introduces it into the optical fiber 52.

  The optical fiber 52 is made of quartz glass or plastic having a high light transmittance. The optical fiber 52 includes a core that is a core and a clad that covers the core. The core has a higher refractive index of light than the cladding. For this reason, light concentrates on the core by total reflection and refraction, and the light received by the light receiving unit 51 can be efficiently propagated to the other end. The light incident on the light receiving unit 51 is introduced into the imaging unit 5 by the optical fiber 52 and is incident on the lens 53.

  The lens 54 collects light received from the imaging range. The lens 53 collects light emitted from the optical fiber 52. The light condensed by the lens 53 and the lens 54 enters the half mirror 55.

  The half mirror 55 is an imaging system. The half mirror 55 is, for example, a metal film deposited on one surface of parallel flat glass having a uniform thickness and material. The half mirror 55 is controlled to have a predetermined ratio of transmittance and reflectance. That is, the half mirror 55 transmits the light collected by the lens 54. The half mirror 55 reflects the light collected by the lens 53. That is, the half mirror 55 causes the area image sensor 56 to form an image of the light collected by the lens 54 and the light collected by the lens 53.

  The area image sensor 56 is a planar light receiving element. The area image sensor 56 converts the received light into an electrical signal and acquires image data. Note that the light condensed by the lens 53, that is, the light emitted from the second illumination unit 2 of the main body 102 is incident on a predetermined position of the area image sensor 56. This predetermined position is adjusted so that the light condensed by the lens 54 and the light condensed by the lens 53 are not mixed.

  That is, the area image sensor 56 includes a first light receiving region and a second light receiving region. The lens 53, the lens 54, and the half so that the light received by the lens 53 is incident on the first light receiving region of the area image sensor 56 and the light received by the lens 54 is incident on the second region of the area image sensor 56. The mirror 55 is adjusted and installed.

  The lens 54 and the first illumination unit 1 of the imaging unit 5 are provided so as to have different optical axes as shown in FIG.

  In the example shown in FIGS. 5 and 6, when the imaging unit 5 captures an image, an image as shown in FIG. 8 is captured.

  FIG. 8 is an explanatory diagram for describing an image captured in the example illustrated in FIGS. 5 and 6.

  A point F illustrated in FIG. 8 is a center point of an image captured by the imaging unit 5.

  As shown in FIG. 8, the bright spot P illuminated by the first illumination unit 1 is reflected above the center point F. Further, below the center point F, a bright spot S due to light from the second illumination unit 2 installed on the passage side of the other main body 102 facing the imaging unit 5 is reflected. In addition, the 2nd illumination part 2 and the light reception step 51 which receives the light from the 2nd illumination part 2 are arranged in multiple numbers, respectively. For this reason, a plurality of bright spots S appear in the image.

  Note that the coordinates at which the bright spot P appears change depending on the distance between the object and the main body 101. That is, based on the coordinates of the bright spot P, the distance between the object and the main body 101 can be obtained by back calculation. Furthermore, based on the coordinates of the bright spot P, the height of the illumination position on the object can be obtained by back calculation.

  FIG. 9 is a view of a passage formed by the pair of main bodies 101 and 102 as viewed from the direction of travel. Here, a method for calculating the distance between the object and the imaging unit 5 and the height of the illumination position of the person by the first illumination device based on the illumination by the first illumination unit 1 will be described.

  First, a distance La from the imaging unit 5 to the object (person) is obtained. The camera position indicates the center point of the camera.

  An angle (irradiation angle) formed by the irradiation direction of the first illumination unit 1 and the horizontal is defined as θL. In addition, an angle formed by a line connecting the illumination position P and the imaging unit 5 and the horizontal is θa. Furthermore, the distance in the height direction between the first illumination unit 1 and the imaging unit 5 is defined as Ds. In this case, the following formula 3 is established.

tan (θa) = (La · tan θL + Ds) / La (Formula 3)
Here, a distance from the imaging unit 5 to a point F ′ in the optical axis direction (the direction of the center point F of the image) of the imaging unit 5 is Lc. In addition, an angle formed by the optical axis of the imaging unit 5 and the horizontal is θel. Furthermore, the surface at the point F ′ in the direction perpendicular to the optical axis direction at the distance Lc is defined as a frame surface. Furthermore, a point where an extension line of the line connecting the imaging unit 5 and the illumination position P and the frame surface intersect is defined as P ′. In this case, the distance Da between the point P ′ and the point F ′ is expressed as the following Equation 4.

Lc · tan (θa-θel) = Da (Formula 4)
Here, the angle of view of the imaging unit 5 is θver. Furthermore, let R ′ be a point where a straight line that forms an angle of 1 / 2θver with the optical axis of the imaging unit 5 and the frame surface intersect. In this case, the distance Dver between the point R ′ and the point F ′ (distance that is a half of the image frame width in the vertical direction) Dver is expressed by the following Equation 5.

Dver = Lc · tan (θver / 2) (Formula 5)
The number of pixels in the X-axis direction (lateral direction) of the image shown in FIG. 8 is 2Nhor. Further, the number of pixels in the Y-axis direction (vertical direction) of the image shown in FIG. 8 is 2Nver. Furthermore, in the image shown in FIG. 8, the distance (number of pixels) between the center of gravity of the illumination position P and the center point F is N1. In this case, the following relationship is established between the distance Dver and the distance Da.

Da / Dver = N1 / Nver (Formula 6)
When Equations 3 to 6 are solved for La, the following Equation 7 is obtained.

La = Ds ・ (C1 ・ tanθel-1) / [C1 ・ (1 + tanθL ・ tanθel) + tanθel-tanθL]
... (Formula 7)
C1 is expressed by the following formula 8.

C1 = N1 · tan (θver / 2) / Nver (8)
θel, θL, θver, and Ds are constants based on conditions such as the installation state of the first illumination unit 1 and the imaging unit 5. N1 / Nver is a value obtained from the image. Therefore, the control unit 9 of the passage detection device 100 can calculate the horizontal distance La from the imaging unit 5 to the illumination position P based on the image acquired by the imaging unit 5.

  Next, the height Dh of the illumination position P is calculated. When the height of the installation position of the imaging unit 5 is Dcam, the height Dh of the illumination position P is calculated by the following formula 9.

Dh = Dcam + La ・ tanθL + Ds (Formula 9)
As described above, the control unit 9 of the passage detection device 100 has the coordinates of the center of gravity and the center point F of the illumination position P illuminated by the first illumination unit 1 reflected in the image captured by the imaging unit 5. The horizontal distance La between the passing person and the imaging unit 5 can be obtained based on the distance between the image capturing unit 5 and the image capturing unit 5. Moreover, the control part 9 can obtain | require the height Dh of the illumination position P of the person (object) to pass based on the calculated distance La. That is, the control unit 9 functions as a detection unit that detects the passing state of the passing object based on the captured image.

  In the automatic ticket gate, it is determined that a person whose height is 125 cm or more is an adult. Therefore, by setting the elevation angle of the first illumination unit 1 so that Dh is approximately 125 cm, If there is a bright spot P in the state where there is no bright spot S (a person is present), it can be determined as an adult, and if there is no bright spot P, it can be determined as a child.

  Further, as described above, by calculating the distance La from both sides of the pair of main bodies 101 and 102, the thickness Lw of the object can also be calculated. That is, the distance from one main body 101 to the object is La1, and the distance from the other main body 102 to the object is La2. Further, it is assumed that the distance between the pair of main bodies 101 and 102 is Lm. In this case, the thickness Lw of the object can be obtained by the equation Lw = Lm− (La1 + La2). Thereby, for example, it is possible to prevent a person having a small thickness such as a bag from being mistaken as a person.

  Further, the bright spot S by the second illumination unit 2 always appears in the same position in the image captured by the imaging unit 5. However, when there is a passing object between the second illumination unit 2 and the imaging unit 5, the bright spot S is not reflected. The control unit 9 detects the presence or absence of a passing object based on whether or not the bright spot S exists at a predetermined position in the image. That is, when it is determined that all the bright spots S are present at the predetermined position, the control unit 9 determines that there is no passing object in the passage. Further, when the control unit 9 determines that the bright spot S does not exist at the predetermined position, the control unit 9 determines that there is a passing object in the passage.

  That is, the control unit 9 functions as a detection unit that detects the passing state of the passing object and the presence / absence of the passing object based on the captured image.

  In addition, when determining whether or not the bright spot S exists at a predetermined position for one pixel, an accurate determination may not be performed due to noise. Therefore, when the position coordinate of the illumination to be determined is only one pixel, the presence / absence of the bright spot S may be determined based on an average value of a plurality of neighboring pixels (for example, eight neighboring pixels).

  With this configuration, it is possible to detect a passing object that cannot be detected by illumination from the first illumination unit 1, such as a passing object with low reflectance. As a result, it is possible to provide a passage detection device that can detect a passing object with higher accuracy.

  As described above, the distance from the imaging unit 5 to the object and the height of the illumination position are calculated by analyzing the image acquired by the imaging unit 5, but the method is not limited to the above method. For example, the relationship between the coordinates of N1, the distance and the height may be calculated in advance to create a lookup table. In this case, the passage detection device 100 can recognize the distance to the object and the height of the illumination position of the object by referring to the lookup table based on the coordinates of the illumination in the image. It is also possible to add a function for correcting lens distortion.

FIG. 10 is a flowchart for explaining the operation of the passage detection apparatus 100 shown in FIG.
First, the passage detection device 100 acquires an image in the imaging range by the imaging unit 5 (step S11).

  When the image is input by the imaging unit 5, the image processing unit 8 of the passage detection device 100 performs binarization processing on the input image (step S12). In other words, the image processing unit 8 compares the threshold value with the value of each pixel of the input image, and replaces the pixels below the threshold value with “dark” and the pixels above the threshold value with “light”.

  The image processing unit 8 performs a labeling process on the binarized image (step S13). That is, the image processing unit 8 performs the process of attaching the same label to adjacent “bright” pixels on the entire image subjected to the binarization process.

  The image processing unit 8 performs a centroid calculation process for calculating the centroid point of each group based on the image subjected to the labeling process (step S14). That is, the image processing unit 8 obtains the coordinates (center of gravity) of the center of each bright spot based on the coordinates and the number of pixels of each pixel in the area.

  Next, the control unit 9 of the passage detection device 100 determines the distance La between the imaging unit 5 and the object and the height Dh of the illumination position P based on the coordinates of the bright spot P illuminated by the first illumination unit 1. An upper calculation process is performed to calculate (step S15).

  That is, the control unit 9 calculates the number of pixels N1 between the center point F and the bright point P based on the image. The control unit 9 can calculate the horizontal distance La from the imaging unit 5 to the illumination position P by solving Equations 7 and 8 using N1. Further, the height Dh of the illumination position P can be calculated by solving Equation 9 using the value of La.

  Note that the thickness Lw of the object can also be calculated by performing the processing in step S15 from the facing detection device 100 on the facing side.

  Next, the control unit 9 of the passage detection device 100 performs lower calculation processing for determining the presence or absence of a passing object passing through the passage based on the coordinates of the bright spot S illuminated by the second illumination unit 2 (step) S16).

  The control unit 9 stores in advance, for example, in an internal memory the coordinates at which the bright spot S appears when there is no passing object. The control unit 9 refers to the pixel of the stored coordinates in the binarized image and determines whether or not it is “bright”. When the referred pixel is “bright”, the control unit 9 determines that there is a bright spot and determines that there is no passing object in the passage. If the referenced pixel is “dark”, the control unit 9 determines that there is no bright spot and determines that there is a passing object in the passage.

  In addition, although the control part 9 demonstrated as a structure which determines whether a passage thing exists in a channel | path based on the brightness of the pixel of the coordinate where the bright spot S appears, it is not limited to this structure. The configuration may be such that the captured image and the input image are compared when there is no passing object. In this case, the control unit 9 compares the input image with an image captured when no passing object exists, and determines that there is a passing object in the passage when a difference is detected. Note that an image used when there is no passing object, which is used for comparison, is stored in advance in a memory of the control unit 9, for example.

  The control unit 9 writes the calculated processing result (distance La, height Dh, and presence / absence of a passing object) in a RAM (random access memory) in the image processing unit 8 (step S17). Here, the processing for one image acquired by the imaging unit 5 ends.

  As described above, the passage detection apparatus 100 is based on the distance between the center point F and the coordinates of the center of gravity of the bright spot P illuminated by the first illumination unit 1 reflected in the image captured by the imaging unit 5. Thus, by solving mathematical formulas determined by the installation conditions of the imaging unit 5 and the first illumination unit 1, whether or not the height of the passing person (object) is greater than or equal to Dh, and the imaging unit 5 and the illumination position P The distance La in the horizontal direction can be obtained.

  Further, the passage detection apparatus 100 according to the present embodiment includes a light receiving unit 51 that receives light emitted from the second illumination unit 2 provided in the main body 102 in a state of being horizontally arranged on the passage side of the main body 101. ing. The light received by the light receiving unit 51 is introduced into the area image sensor 56 in the imaging unit 5 by the optical fiber 52 and the optical system. With this configuration, it is possible to detect passing objects with a single camera with a small number of blind spots.

  In the above-described embodiment, the passage detection device 100 includes one first illumination unit 1 installed with an elevation angle, and a main body 102 facing the main body 101 on which the first illumination unit 1 is installed. However, the present invention is not limited to this configuration. However, the configuration is not limited to this configuration. This configuration is a minimum configuration, and the number of lights may be further increased.

  FIG. 11 is a diagram illustrating an overview of another example of the passage detection device 100. As illustrated in FIG. 11, the passage detection device 100 includes a plurality of first illumination units 1, and the plurality of first illumination units 1 are installed at different elevation angles. Thus, by installing the plurality of first illumination units 1 at different elevation angles, the height of the object that can be detected can be given a width.

  FIG. 12 is a diagram illustrating an overview of still another example of the passage detection device 100. As illustrated in FIG. 12, the passage detection device 100 includes a plurality of first illumination units 1, and a plurality of the first illumination units 1 are installed along the passage direction of the passage. That is, by arranging the plurality of first illumination units 1 along the passage direction in this way, the passage detection device 100 can detect the height of the object at a plurality of positions.

  FIG. 13 is a diagram illustrating an overview of still another example of the passage detection device 100. As illustrated in FIG. 13, the passage detection device 100 includes a plurality of rows of second illumination units 2. That is, the passage detection device 100 includes a plurality of second illumination units 2 arranged at different heights along the passage direction of the passage. In this case, the main body 101 facing the second illuminating unit 2 includes the light receiving units 51 arranged at different heights along the passage direction of the passage. Each second illumination unit 2 is adjusted and installed so that light can enter the corresponding light receiving unit 51. Thus, by arranging the second illumination unit 2 and the light receiving unit 51 in a plurality of rows, the passage detection device 100 can detect the presence or absence of a passing object.

  FIG. 14 is a diagram illustrating an overview of still another example of the passage detection device 100. As illustrated in FIG. 14, the passage detection device 100 includes a line-shaped continuous parallel illumination 11 as a second illumination unit. Thus, by using the parallel illumination 11 as the second illumination unit, the resolution in the horizontal direction can be increased.

  Next, the passage detection apparatus according to the second embodiment of the present invention will be described in detail.

  FIG. 15 is a block diagram for explaining a configuration example of the passage detection apparatus 200 according to the second embodiment. The same reference numerals are given to the same components as those of the passage detection device 100 of the first embodiment, and detailed description thereof will be omitted.

  As illustrated in FIG. 15, the passage detection device 200 includes a first illumination unit 1, a third illumination unit 3, an illumination control unit 4, an imaging unit 5, an imaging control unit 6, an image input unit 7, and an image processing unit 8. And a control unit 9 and the like. The image input unit 7, the image processing unit 8, and the control unit 9 are connected to each other via a bus 10 or the like.

FIG. 16 is a diagram illustrating an overview of the passage detection device 200 illustrated in FIG. 15.
FIG. 17 is a view of a passage formed by the pair of main bodies 201 and 202 as viewed from above.
FIG. 18 is a view of the passage formed by the pair of main bodies 201 and 202 as viewed from the direction of travel.

  As shown in FIGS. 16 to 18, the third illumination unit 3 is installed in a state where a plurality of third illumination units 3 are arranged horizontally on the passage side surface of the main body 201 on which the imaging unit 5 is installed. The 3rd illumination part 3 is provided with LED etc. which emit the near infrared light which has directivity, for example. A plurality of third illumination units 3 are arranged horizontally along the passage direction of the passage formed by the pair of main bodies 201 and 202. That is, the 3rd illumination part 3 emits the near infrared light which has directivity toward a path | route horizontally.

  In addition, the 3rd illumination part 3 is provided with the condensing lens etc., for example. In this case, the light emitted from the third illumination unit 3 is condensed by the condenser lens. The light emitted from the third illuminating unit 3 is in the form of a beam having a radius of an irradiation range of about several centimeters at the maximum distance (about the width of the passage formed by the pair of main bodies 201 and 202).

  In addition, a light receiving unit 51 is provided in the vicinity of each third illumination unit 3. The light receiving unit 51 includes a lens 57. The lens 57 receives light from at least a range illuminated by the third illumination unit 3. The 3rd illumination part 3 and the light-receiving part 51 are provided so that it may correspond. Each light receiving unit 51 receives light in a range illuminated by the corresponding third illumination unit 3, that is, reflected light. That is, the light emitted from the third illumination unit 3 is diffusely reflected by the passing material. The lens 57 receives the light diffusely reflected by the passing material and introduces it into the optical fiber 52 connected to the light receiving unit 51.

  As shown in FIGS. 17 and 18, the first illumination unit 1 irradiates a person. The lens 54 of the imaging unit 5 receives light in a range illuminated by the first illumination unit 1. That is, the lens 54 receives the reflected light of the light emitted from the first illumination unit 1.

  FIG. 19 is an explanatory diagram for describing a configuration example of the imaging unit 5 illustrated in FIG. 15. As shown in FIG. 7, the imaging unit 5 includes a light receiving unit 51, an optical fiber 52, a lens 53, a lens 54, a half mirror 55, and an area image sensor 56.

  In addition, as described above, the light receiving unit 51 includes the lens 57. The light receiving unit 51 is configured by installing the end of the optical fiber 52 at the focal point of the lens 57. That is, the light condensed by the lens 57 is introduced into the optical fiber 52.

  The light introduced into the optical fiber 52 enters the lens 54. The light condensed by the lens 53 passes through the half mirror 55 and enters the area image sensor 56. The light collected by the lens 53 is reflected by the half mirror 55 and enters the area image sensor 56. The area image sensor 56 converts the received light into an electrical signal and acquires image data.

  FIG. 20 is an explanatory diagram for describing an image captured by the imaging unit 5 of the passage detection device 200 illustrated in FIG. 15.

  As shown in FIG. 20, in the image of this embodiment, the bright spot P by the first illumination unit 1 and the bright spot Q by the third illumination unit 3 described in the first embodiment are reflected.

  The bright spot Q by the third illumination unit 3 always appears in the same position. This is because the lens 53 and the half mirror 55 in the imaging unit 5 are adjusted and installed so that the light received by the light receiving unit 51 enters a predetermined position of the area image sensor 56. However, when there is no passing object in the passage, the bright point Q does not appear in the image because there is no reflecting object that reflects the light emitted from the third illumination unit 3.

  The control unit 9 detects the presence or absence of a passing object based on whether or not the bright spot Q exists at a predetermined position in the image. That is, when the control unit 9 determines that the bright spot Q exists at a predetermined position, the control unit 9 determines that there is a passing object in the passage. Further, when the control unit 9 determines that the bright spot Q does not exist at the predetermined position, the control unit 9 determines that there is no passing object in the passage.

  In addition, when determining whether or not the bright spot Q exists at a predetermined position for one pixel, an accurate determination may not be performed due to noise. Therefore, when the position coordinate of the illumination to be determined is only one pixel, the presence / absence of the bright spot Q may be determined based on an average value of a plurality of neighboring pixels (for example, eight neighboring pixels).

  As described above, the passage detection device 200 according to the present embodiment includes the light receiving units 51 that receive the reflected light of the light emitted from the third illumination unit 3 provided in the main body 201 as the third illumination units 3. In the vicinity. The light received by the light receiving unit 51 is introduced into the area image sensor 56 in the imaging unit 5 by the optical fiber 52 and the optical system. With this configuration, a passing object can be detected with a single camera with fewer blind spots.

  In said 1st Embodiment, the 1st illumination part 1 and the imaging part 5 are installed in one main body 101 of a pair of main bodies 101 and 102 which form a channel | path, and the 2nd illumination part 2 is set. Although described as being installed in the other main body 102, the present invention is not limited to this configuration. Both the main bodies 101 and 102 forming the passage may include the first illumination unit 1, the second illumination unit 2, and the imaging unit 5.

  Moreover, in said 2nd Embodiment, the 1st illumination part 1, the 3rd illumination part 3, and the imaging part 5 are installed in one main body 201 of a pair of main bodies 201 and 202 which form a channel | path. However, the present invention is not limited to this configuration. Both the main bodies 201 and 202 forming the passage may include the first illumination unit 1, the third illumination unit 3, and the imaging unit 5.

  21A and 22A show an example in which both the main bodies 101 and 102 forming the passage include the light source 2, the transmissive light-receiving unit 51, and the imaging unit 5. (B) is an explanatory diagram for explaining examples in which both the main bodies 201 and 202 forming the passage include the light source 2, the reflection type light receiving unit 51, and the imaging unit 5.

  21 is a view of the passage formed by the pair of traffic control devices as viewed from above, and FIG. 22 is a view of the passage formed by the pair of traffic control devices as viewed from the direction of travel.

  As shown in FIGS. 21A and 22A, one main body (first main body) 101 of the passage detection device 100 includes a first illumination unit 1, a second illumination unit 2, and an imaging unit 5. And a transmissive light receiving unit 51. The other main body (second main body) 102 of the passage detection device 100 also includes a first illumination unit 1, a second illumination unit 2, an imaging unit 5, and a transmissive light receiving unit 51. The light receiving unit 51 installed in the first main body 101 receives light emitted from the second illumination unit 2 installed in the second main body 102. The light receiving unit 51 installed in the second main body 102 receives light emitted from the second illumination unit 2 installed in the first main body 101.

  As shown in FIGS. 21A and 22A, when the person is within the imaging range of the imaging unit 5, the first illumination unit 1 irradiates the person. Moreover, the light from the 2nd illumination part 2 installed in multiple on the surface by the side of the 1st and 2nd main body 101,102 is interrupted | blocked according to the position where a person stands.

That is, in the example shown in FIGS. 21A and 22A, when images are taken by the respective imaging units 5 installed in the first and second main bodies 101 and 102, FIG. And an image as shown to FIG. 23 (B) is imaged.

  As shown in FIGS. 23A and 23B, the bright spot P illuminated by the first illumination unit 1 is reflected above the center of the image. Note that the coordinates of the bright spot P change according to the distance between the imaging unit 5 and the person.

  Further, as shown in FIGS. 23A and 23B, the bright spot S illuminated by the second illumination unit 2 is reflected below the center of the image. Note that a plurality of bright spots S by the second illumination unit 2 are reflected because a plurality of the second illumination units 2 are arranged on the passage side surface of the main body of the passage detection device 100. The second illumination unit 2 is a light source installed in the main body that faces the imaging unit 5. For this reason, the bright spot S by the 2nd illumination part 2 always appears in the predetermined position of an image.

  In the example shown in FIGS. 21A and 22A, a person is present on the optical axis of the light by the second illumination unit 2. For this reason, in the images shown in FIGS. 23A and 23B, the corresponding coordinates are dark spots.

  That is, when it is determined that the bright spot S exists at a predetermined position, the control unit 9 determines that there is no passing object in the passage. Further, when the control unit 9 determines that the bright spot S does not exist at the predetermined position, the control unit 9 determines that there is a passing object in the passage.

  Further, as shown in FIGS. 21B and 22B, one main body (first main body) 201 of the passage detection device 200 includes the first illumination unit 1, the third illumination unit 3, and the imaging. A unit 5 and a light receiving unit 51 are provided. The other main body (second main body) 202 of the passage detection device 200 also includes a first illumination unit 1, a third illumination unit 3, an imaging unit 5, and a light receiving unit 51. The third illuminating unit 3 is installed so as to be shifted in the horizontal direction or the vertical direction with the light receiving unit 51 of the facing main body so that the emitted light does not enter the light receiving unit 51 of the facing main body. The antireflection coating is provided so as not to be reflected by the main body facing when there is no passing material in the passage.

  The light receiving unit 51 installed in the first main body 201 receives reflected light of light emitted from the third illumination unit 3 installed in the first main body 201. Further, the light receiving unit 51 installed in the second main body 202 receives reflected light of light emitted from the third illumination unit 3 installed in the second main body 202.

  As shown in FIGS. 21B and 22B, when the passing object is present within the imaging range of the imaging unit 5, the first illumination unit 1 irradiates the passing object. Moreover, the light from the 3rd illumination part 3 installed in multiple on the surface by the side of the channel | path of the 1st and 2nd main bodies 201 and 202 is irradiating a passing thing. The light receiving units 51 installed in the vicinity of the third illumination unit 3 of the first and second main bodies 201 and 202 receive the reflected light in the range illuminated by the corresponding third illumination unit 3.

  That is, in the example shown in FIG. 21B and FIG. 22B, when images are captured by the respective imaging units 5 installed in the first and second main bodies 201 and 202, FIG. And an image as shown to FIG. 24 (B) is imaged.

  As shown in FIGS. 24A and 24B, the bright spot P illuminated by the first illumination unit 1 is reflected above the center of the image. Note that the coordinates of the bright spot P change according to the distance between the imaging unit 5 and the person.

  Further, as shown in FIGS. 24A and 24B, the bright spot Q illuminated by the third illumination unit 3 is reflected below the center of the image. Note that a plurality of bright spots Q by the third illumination unit 3 are reflected because a plurality of the third illumination units 3 are arranged on the passage side surface of the main body of the passage detection device 200. The light receiving unit 51 and the optical system in the imaging unit 5 are adjusted and installed so that the bright spot Q always appears in the same position in the image. For this reason, the bright spot Q by the third illumination unit 3 always appears in a predetermined position of the image.

  In the example shown in FIGS. 21B and 22B, there is a passing object on the optical axis of the light by the third illumination unit 3. For this reason, the corresponding coordinates are the bright spots Q in the images shown in FIGS.

  That is, when the control unit 9 determines that the bright spot Q exists at a predetermined position, the control unit 9 determines that there is a passing object in the passage. Further, when the control unit 9 determines that the bright spot Q does not exist at the predetermined position, the control unit 9 determines that there is no passing object in the passage.

  As described above, in other embodiments of the first embodiment, both the main bodies 101 and 102 of the passage detection device 100 forming the passage are respectively the first illumination unit 1, the second illumination unit 2, and the imaging. Part 5 is provided. Moreover, in other embodiment of 2nd Embodiment, both main bodies 201 and 202 of the passage detection apparatus 200 which form a channel | path are the 1st illumination part 1, the 3rd illumination part 3, and the imaging part 5, respectively. Prepare. With this configuration, it is possible to detect passing objects with fewer blind spots.

  In addition, this invention is not limited to the said embodiment as it is, It can implement by changing a component in the range which does not deviate from the summary in an implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... 1st illumination part, 2 ... 2nd illumination part, 3 ... 3rd illumination part, 4 ... Illumination control part, 5 ... Imaging part, 6 ... Imaging control part, 7 ... Image input part, 8 ... Image Processing unit, 9 ... control unit, 10 ... bus, 11 ... parallel illumination, 51 ... light receiving unit, 52 ... optical fiber, 53 ... lens, 54 ... lens, 55 ... half mirror, 56 ... area image sensor, 57 ... lens, 100: Pass detection device, 200: Pass detection device.

Claims (8)

A passage detection device that detects a passing substance passing through a passage formed between a pair of main bodies provided facing each other,
A first optical system provided on the passage side of one of the pair of main bodies and receiving light from a predetermined range on the passage side;
Provided with an elevation angle so as to have an optical axis different from the optical axis of the first optical system above the first optical system of the main body on the same side as the first optical system. A first illumination unit for irradiation;
A main body in which the first optical system is installed, a plurality of second illumination units that are provided on the passage side of the other main body along the passage direction of the passage, and irradiate beam-shaped light; and
A plurality of second optical systems provided along the passage direction of the passage on the passage side of the main body on the same side as the first optical system, and receiving light from the second illumination unit;
A planar light-receiving element that converts received light into an image;
An imaging system provided in a preceding stage of the light receiving element, for imaging the light received by the first optical system and the light received by the second optical system on the light receiving element;
Based on the image converted by the light receiving element, a detection unit that detects a passing state of the passing object,
A passage detection device comprising: The light receiving element includes a first light receiving region and a second light receiving region,
The imaging system causes the light received by the first optical system to enter the first light receiving region of the light receiving element, and the light received by the second optical system enters the second region of the light receiving element. The passage detection device according to claim 1, wherein the light is incident. The imaging system comprises a half mirror,
The half mirror transmits light received by the first optical system and enters the first light receiving region of the light receiving element, reflects light received by the second optical system, and reflects the light received by the light receiving element. The passage detection device according to claim 2, wherein the light is incident on the second light receiving region.   The detection unit detects a height of a bright spot based on coordinates of a bright spot illuminated by the first illumination unit in the image converted by the light receiving element. The passage detection device described. A passage detection device that detects a passing substance passing through a passage formed between a pair of main bodies provided facing each other,
A first optical system that is provided in both of the pair of main bodies and receives light from a predetermined range on the passage side;
Each of the pair of main bodies is provided with an elevation angle so as to have an optical axis different from the optical axis of the first optical system above the first optical system, and irradiates beam-shaped light. The lighting section of
A plurality of second illuminating units that are provided along the passage direction of the passages on both passage sides of the pair of main bodies, and irradiate beam-shaped light; and
A second optical system configured to receive a light from the second illuminating unit, which is provided on the both passage sides of the pair of main bodies, respectively, along the passage direction of the passage, and is installed on the facing main body;
A planar light-receiving element that is provided on both of the pair of main bodies and converts received light into an image;
An imaging system provided in a preceding stage of each of the light receiving elements and imaging the light received by the first optical system and the light received by the second optical system on the light receiving element;
Based on the image converted by each of the light receiving elements, a detection unit that detects a passing state of the passing object,
A passage detection device comprising: A passage detection device that detects a passing substance passing through a passage formed between a pair of main bodies provided facing each other,
A first optical system provided on the passage side of one of the pair of main bodies and receiving light from a predetermined range on the passage side;
Provided with an elevation angle so as to have an optical axis different from the optical axis of the first optical system above the first optical system of the main body on the same side as the first optical system. A first illumination unit for irradiation;
A plurality of light beams are provided along the passage direction of the passage on the passage side below the first optical system of the main body on the same side as the main body on which the first optical system is installed, and irradiate beam-shaped light. A third lighting unit;
A third optical system provided in the vicinity of the third illuminating unit and receiving light from a range illuminated by the corresponding third illuminating unit;
A planar light-receiving element that converts received light into an image;
An imaging system that is provided in front of the light receiving element and forms an image on the light receiving element with the light received by the first optical system and the light received by the third optical system;
Based on the image converted by the light receiving element, a detection unit that detects a passing state of the passing object,
A passage detection device comprising: A passage detection device that detects a passing substance passing through a passage formed between a pair of main bodies provided facing each other,
A first optical system that is provided in both of the pair of main bodies and receives light from a predetermined range on the passage side;
Each of the pair of main bodies is provided with an elevation angle so as to have an optical axis different from the optical axis of the first optical system above the first optical system, and irradiates beam-shaped light. The lighting section of
A plurality of third illuminators that irradiate beam-like light, each provided along the passage direction of the passage on the passage side below the first optical system of both of the pair of main bodies;
A third optical system that is provided in the vicinity of each of the third illumination units and receives light from a range illuminated by the corresponding third illumination unit;
A planar light-receiving element that is provided on both of the pair of main bodies and converts received light into an image;
An imaging system provided in a preceding stage of each of the light receiving elements and imaging the light received by the first optical system and the light received by the third optical system on the light receiving element;
Based on the image converted by each of the light receiving elements, a detection unit that detects a passing state of the passing object,
A passage detection device comprising:   The detection unit detects a height of a bright spot based on coordinates of a bright spot illuminated by the first illumination unit in an image converted by the light receiving element. The passage detection device according to claim 7.

Images