WO2021095112A1 - Dispositif de détection de gaz, procédé de commande de traitement d'image et programme de commande de traitement d'image - Google Patents

Dispositif de détection de gaz, procédé de commande de traitement d'image et programme de commande de traitement d'image Download PDF

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Publication number
WO2021095112A1
WO2021095112A1 PCT/JP2019/044254 JP2019044254W WO2021095112A1 WO 2021095112 A1 WO2021095112 A1 WO 2021095112A1 JP 2019044254 W JP2019044254 W JP 2019044254W WO 2021095112 A1 WO2021095112 A1 WO 2021095112A1
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WIPO (PCT)
Prior art keywords
image processing
image
gas
unit
infrared
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PCT/JP2019/044254
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English (en)
Japanese (ja)
Inventor
昭洋 鈴木
基広 浅野
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コニカミノルタ株式会社
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Priority to PCT/JP2019/044254 priority Critical patent/WO2021095112A1/fr
Publication of WO2021095112A1 publication Critical patent/WO2021095112A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis

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  • the present invention relates to a gas detection device, an image processing control method, and an image processing control program.
  • a gas detection device that detects a gas leak in a monitored target (for example, a gas production facility) by using an infrared camera that is sensitive to the wavelength band of light absorbed by the gas to be inspected (for example, methane) has been known. Has been done.
  • a gas detection device that detects a gas leak in a monitored target (for example, a gas production facility) by using an infrared camera that is sensitive to the wavelength band of light absorbed by the gas to be inspected (for example, methane) has been known.
  • the infrared camera that is sensitive to the wavelength band of light absorbed by the gas to be inspected (for example, methane)
  • the change in the image is visualized as the presence of gas, and the detection accuracy of gas leak is improved.
  • the technology to make it is proposed. In this technique, since the displayed image is a difference image and contains a lot of noise, the inspector needs considerable skill to confirm the accurate position, size, etc. of the gas leak from the difference image.
  • the frequency of the time-series pixel data at the same position is lower than that of the first frequency component data indicating the temperature change due to the leaked gas, and the temperature change of the background to be monitored is indicated.
  • the gas candidate image is extracted by performing a process of removing the frequency component data of No. 2 from the image data showing the infrared image.
  • Patent Document 1 has a high ability to detect leaked gas, and has an excellent ability to detect a slight gas leak even if the person is not an expert.
  • the infrared camera is used, for example, because the inspector holds the infrared camera in his hand. When it vibrates, it becomes difficult to arrange the pixels at the same position in time series, and the gas detection ability tends to decrease. Therefore, it is necessary for the inspector to take an infrared image after firmly fixing the infrared camera to a tripod or the like instead of holding the infrared camera in his hand.
  • An object of the present invention is to provide a gas detection device, an image processing control method, and an image processing control program capable of efficiently inspecting a gas leak.
  • the gas detection device is a gas detection device that detects the detection target gas by performing image processing on a plurality of infrared images captured at a plurality of different times by the image pickup device.
  • a first image processing unit that executes a first image processing capable of detecting the detection target gas, and a first image processing unit.
  • a second image processing unit that executes a second image processing capable of detecting the detection target gas with higher accuracy than the first image processing, and a second image processing unit.
  • a control unit that controls the first and second image processing units so as to selectively execute the first or second image processing, and a control unit. To be equipped.
  • the image processing control method is This is an image processing control method in a gas detection device that detects a gas to be detected by performing image processing on a plurality of infrared images captured at a plurality of times different by the image pickup device. While executing the first image processing capable of detecting the detection target gas, when the gas detection device is fixed, the detection target gas can be detected with higher accuracy than the first image processing. 2 Controls to execute image processing.
  • the image processing control program according to the present invention is An image processing control program applied to a computer that controls a gas detection device that detects a gas to be detected by performing image processing on a plurality of infrared images captured at a plurality of different times depending on the image pickup device.
  • a gas detection device that detects a gas to be detected by performing image processing on a plurality of infrared images captured at a plurality of different times depending on the image pickup device.
  • the detection target gas can be detected with higher accuracy than the first image processing. 2
  • gas leaks can be inspected efficiently.
  • FIG. 1 is a block diagram showing a functional configuration of the gas detection system 10 according to the present embodiment.
  • the gas detection system 10 includes a portable imaging device 100 and an inspection device 120 (functioning as the "gas detection device" of the present invention).
  • the imaging device 100 and the inspection device 120 are connected by a communication cable (not shown).
  • the image pickup device 100 may be connected to the inspection device 120 via wireless communication, or the image pickup device 100 and the inspection device 120 may be integrated. Further, the image pickup apparatus 100 may be connected to the inspection apparatus 120 via a network such as the Internet.
  • the image pickup device 100 is, for example, a portable camera device that captures an inspection area including a gas production facility (tank, plant, etc.) to be monitored and generates infrared image data of the inspection area.
  • a gas production facility such as tank, plant, etc.
  • the imaging device 100 includes an infrared imaging unit 102, a visible imaging unit 104, and a fixed detection unit 106.
  • the image pickup apparatus 100 includes, for example, a CPU (Central Processing Unit) as a processor, a storage medium such as a ROM (Read Only Memory) storing a control program, and a working memory such as a RAM (Random Access Memory). , And has a communication circuit.
  • a CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • the infrared imaging unit 102 includes a first optical system (not shown), a first optical filter (not shown), an infrared sensor (not shown), and the like.
  • the first optical system forms an image of infrared rays incident from an inspection area (subject) including a gas production facility (tank, plant, etc.) to be monitored on an infrared sensor.
  • the first optical filter is a bandpass filter or the like arranged on the optical path connecting the first optical system and the infrared sensor.
  • the first optical filter allows only infrared rays included in a predetermined wavelength band to pass among the infrared rays that have passed through the first optical system.
  • the passing wavelength band of the first optical filter is substantially set to the absorption wavelength band of the gas to be detected. For example, when the passing wavelength band is set to a medium wavelength range of 3.2 to 3.4 ⁇ m, methane gas or the like can be detected.
  • the infrared sensor is, for example, a quantum image sensor using indium antimonide (InSb), which receives infrared rays and generates infrared image data.
  • InSb indium antimonide
  • Such an infrared imaging unit 102 is in a state of being synchronized with the visible imaging unit 104 (that is, a range corresponding to the range represented by the visible image captured by the visible imaging unit 104), for example, a gas production facility to be monitored.
  • the inspection area including the inspection region is imaged, and the infrared image data corresponding to the captured infrared image is sequentially transmitted to the inspection device 120.
  • the infrared image data generated by the infrared imaging unit 102 is a still image or a moving image. Such infrared image data shows the temperature distribution in the inspection area.
  • the visible imaging unit 104 includes a second optical system (not shown), a second optical filter (not shown), a visible light sensor (not shown), and the like.
  • the second optical system forms an image of visible light incident from the inspection area to be a subject on the visible light sensor.
  • the second optical filter is an infrared cut filter or the like arranged on the optical path connecting the second optical system and the visible light sensor.
  • the infrared cut filter cuts infrared rays from the light that has passed through the second optical system.
  • the visible light sensor is, for example, a CMOS image sensor that receives visible light of black and white BW or visible light of color RGB to generate visible image data.
  • Such a visible imaging unit 104 images an inspection region and images the inspection region in a state synchronized with the infrared imaging unit 102 (that is, a range corresponding to the range represented by the infrared image captured by the infrared imaging unit 102).
  • the visible image data corresponding to the visible image is sequentially transmitted to the inspection device 120.
  • the visible image data generated by the visible imaging unit 104 is a still image or a moving image.
  • the fixed detection unit 106 detects whether or not the image pickup device 100 is fixed to, for example, a tripod in order to keep the posture of the image pickup device 100 constant. Then, the fixed detection unit 106 sequentially transmits the detection result as to whether or not it is in the fixed state to the inspection device 120.
  • a fixing hole (not shown) for inserting into a tripod and fixing the image pickup device 100 to the tripod is provided at the bottom of the housing of the image pickup apparatus 100.
  • a tripod switch (not shown) that is pushed by being inserted into a tripod is provided above the fixing hole.
  • the fixed detection unit 106 detects that the image pickup device 100 is in the fixed state when the tripod switch is pressed, while the image pickup device 100 is not in the fixed state when the tripod switch is not pressed. Detect that.
  • the fixed detection unit 106 detects the posture of the image pickup device 100 based on the output of an acceleration sensor (not shown) provided inside the image pickup device 100, and the image pickup device 100 is fixed to, for example, a tripod. It may be detected whether or not it is. In this case, the fixed detection unit 106 detects that the image pickup device 100 is in a fixed state when the attitude change of the image pickup apparatus 100 is small, while the image pickup apparatus 100 detects that the image pickup apparatus 100 is in a fixed state when the attitude change of the image pickup apparatus 100 is large. Detects that it is not in a fixed state.
  • the inspection device 120 visualizes the gas generated in the inspection area (hereinafter, also referred to as “detection target gas”) by using the received information (infrared image data, visible image data) from the image pickup device 100.
  • detection target gas gas generated in the inspection area
  • Such an inspection device 120 is a mobile terminal such as a tablet terminal, a smartphone, a laptop terminal, or a wearable terminal that is communication-connected to the image pickup device 100.
  • the inspection device 120 includes a first image processing unit 122, a second image processing unit 124, a control unit 126, a display control unit 128, a display unit 130, and an input reception unit 132.
  • the control unit 126 also functions as the "determination unit" of the present invention.
  • the inspection device 120 is, for example, a CPU (Central Processing Unit) as a processor, a storage medium such as a ROM (Read Only Memory) storing a control program, and a working memory such as a RAM (Random Access Memory). , And has a communication circuit.
  • a CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • the first image processing unit 122 sequentially receives the infrared image data of the inspection region transmitted from the infrared imaging unit 102, and under the control of the control unit 126, a plurality of infrared images captured at a plurality of different times.
  • the detection target gas is detected by performing the first image processing on the image.
  • the first image processing unit 122 performs image processing for generating a difference image showing a difference between a plurality of infrared images as the first image processing, and controls the generated difference image as the first image. Output to unit 126.
  • the first image processing unit 122 sets the difference between the infrared image corresponding to the infrared image data received this time and the infrared image corresponding to the infrared image data received a predetermined number of times before (for example, The difference between the infrared image in the Nth frame and the infrared image in the N-2th frame) is taken to generate a difference image.
  • the second image processing unit 124 sequentially receives the infrared image data of the inspection region transmitted from the infrared imaging unit 102, and under the control of the control unit 126, a plurality of infrared images captured at a plurality of different times.
  • the detection target gas is detected by performing the second image processing on the image.
  • the second image processing unit 124 performs image processing on pixel data in which pixels at the same position are arranged in time series in a plurality of infrared images as the second image processing, and the second image The image obtained by the processing is output as a second image.
  • the second image processing unit 124 has a lower frequency than the first frequency component data indicating the temperature change due to the leaked detection target gas with respect to the time series pixel data at the same position, and the background of the monitoring target.
  • the gas image indicating the detection target gas is detected.
  • processing is performed to remove the third frequency component data, which has a higher frequency than the first frequency component data indicating the temperature change due to the leaked detection target gas and indicates high frequency noise, from the infrared image data indicating the infrared image. It is preferable (for further details, see Patent Document 1 above).
  • the second image processing is an image processing capable of detecting the detection target gas with higher accuracy than the first image processing.
  • the second image processing unit 124 has a specific color on the visible image corresponding to the visible image data of the inspection region transmitted from the visible imaging unit 104, in which the portion corresponding to the detection portion of the gas image by the second image processing is used.
  • the gas to be detected is visualized by adding (for example, red color).
  • the second image processing unit 124 outputs the visible image after visualizing the detection target gas on the visible image to the control unit 126 as the third image.
  • the second image processing unit 124 is a portion corresponding to the detection portion of the gas image by the second image processing on the infrared image corresponding to the infrared image data of the inspection region transmitted from the infrared imaging unit 102.
  • a specific color for example, red
  • the second image processing unit 124 outputs the infrared image after visualizing the detection target gas on the infrared image to the control unit 126 as the fourth image.
  • the display control unit 128 controls the display unit 130 so as to display various images under the control of the control unit 126.
  • the display unit 130 is, for example, a display constituting the inspection device 120.
  • a liquid crystal display, an organic EL display, or the like can be used.
  • the display is a flat panel display with a touch panel.
  • the display unit 130 displays various images for performing a gas inspection by being visually recognized by a user (for example, an inspector) based on a display signal from the display control unit 128.
  • the input receiving unit 132 receives various inputs (information input, instruction input) by the user via an operation unit (touch panel) (not shown).
  • the control unit 126 controls the first and second image processing units 122 and 124 so as to selectively execute the first or second image processing.
  • the control unit 126 controls the first image processing unit 122 to execute the first image processing and controls the display control unit 128 before the user is instructed to start the substantive inspection of the gas leak.
  • the pre-inspection screen 200 shown in the above is displayed on the display unit 130.
  • the pre-inspection screen 200 is a display screen when a user performs a pre-inspection of a gas leak, and has a display area 202 and a start button 204 for instructing the start of a substantive inspection of the gas leak (
  • the software key the visible image 210 corresponding to the visible image data transmitted from the visible imaging unit 104, the infrared image 212 corresponding to the infrared image data transmitted from the infrared imaging unit 102, and the first image processing.
  • the first image 214 (difference image) output from the unit 122 is included.
  • the user can give an instruction to enlarge any one of the visible image 210, the infrared image 212, and the first image 214 and display it in the display area 202 via the input receiving unit 132.
  • the first image 214 is selected (check mark display) according to the user's instruction, and the first image 214 is enlarged and displayed in the display area 202.
  • the user can confirm the presence or absence of the gas leak 206 by referring to the first image 214 displayed in the display area 202 even if the image pickup device 100 is not fixed to the tripod. it can.
  • the user moves to the next work site and inspects the gas leak.
  • the user fixes the image pickup device 100 to the tripod when it can be confirmed that there is a gas leak by referring to the first image 214 displayed in the display area 202. Then, the user presses the start button 204 via the input receiving unit 132 to start the substantive inspection of the gas leak.
  • control unit 126 controls the second image processing unit 124 to execute the second image processing, and also controls the display control unit 128 to control FIG.
  • the inspection screen 300 shown in 1 and 4 is displayed on the display unit 130.
  • the inspection screen 300 is a display screen when the user performs a substantive inspection of a gas leak.
  • the inspection screen 300 includes a display area 302, an end button 304 (software key) for instructing the end of the substantive inspection of gas leakage, and a visible image 310 corresponding to the visible image data transmitted from the visible imaging unit 104.
  • the infrared image 312 corresponding to the infrared image data transmitted from the infrared imaging unit 102, and the second image 314, the third image 316, and the fourth image 318 output from the second image processing unit 124 are included. ..
  • the user gives an instruction to enlarge any one of the visible image 310, the infrared image 312, the second image 314, the third image 316, and the fourth image 318 and display them in the display area 302 via the input receiving unit 132. be able to.
  • the second image 314 is selected (check mark display) according to the user's instruction, and the second image 314 is enlarged and displayed in the display area 302.
  • the user can confirm the exact position, size, etc. of the gas leak 306 by referring to the second image 314 displayed in the display area 302.
  • the third image 316 (the image after visualizing the detection target gas on the visible image) is selected (check mark display) according to the user's instruction, and the third image 316 is enlarged to display the display area 302. It is displayed in.
  • the user can clarify the exact position, size, etc. of the gas leak 306 as compared with the case of referring to the second image 314. You can check.
  • the control unit 126 ends the display of the inspection screen 300 and causes the display unit 130 to display the pre-inspection screen 200 (see FIG. 2).
  • the user then moves to the next work site to pre-inspect for gas leaks.
  • the inspection device 120 in the present embodiment is detected by performing image processing on a plurality of infrared images captured at a plurality of times different by the image pickup device 100. It is a gas detection device that detects gas.
  • the inspection device 120 includes a first image processing unit 122 that executes a first image processing capable of detecting the detection target gas even when the image pickup device 100 is not fixed, and an image pickup device.
  • the second image processing unit 124 that executes the second image processing capable of detecting the detection target gas with higher accuracy than the first image processing, and the first or second image processing It includes a control unit 126 that controls the first and second image processing units 122 and 124 so as to selectively execute the images.
  • the presence or absence of gas leakage is confirmed in advance from (first image 214).
  • the user moves to the next work site.
  • the user can execute the second image processing executed with the image pickup apparatus 100 fixed (second image 314, third image 316, and first). 4 Confirm the exact position, size, etc. of the gas leak 306 from the image 318).
  • the image pickup apparatus 100 may be fixed and the exact position, size, etc. of the gas leak 306 may be confirmed.
  • the time and effort for fixing the image pickup device 100 and the occurrence of time loss can be suppressed, and the gas leak can be inspected efficiently.
  • control unit 126 selectively executes the first or second image processing in response to a user's instruction (pressing the start button 204 and the end button 304) has been described.
  • the present invention is not limited to this.
  • the control unit 126 determines whether or not the image pickup device 100 is in a fixed state based on the detection result of the fixed detection unit 106, and determines that the image pickup device 100 is not in a fixed state.
  • the second image processing may be executed.
  • the control unit 126 determines that the imaging device 100 is fixed based on the detection result of the fixed detection unit 106, and the pre-inspection screen 200. Is terminated, and the inspection screen 300 is displayed.
  • Gas detection system 100 Imaging device 102 Infrared imaging unit 104 Visible imaging unit 106 Fixed detection unit 120 Inspection device 122 1st image processing unit 124 2nd image processing unit 126 Control unit 128 Display control unit 130 Display unit 132 Input reception unit

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Abstract

L'invention concerne un dispositif de détection de gaz, un procédé de commande de traitement d'image et un programme de commande de traitement d'image qui permettent d'inspecter efficacement à la recherche d'une fuite de gaz. Ce dispositif de détection de gaz pour détecter un gaz à détecter par le traitement d'image d'une pluralité d'images infrarouges imagées par un dispositif d'imagerie à une pluralité de temps différents comprend : une première unité de traitement d'image pour effectuer un premier traitement d'image pour permettre la détection du gaz à détecter ; une seconde unité de traitement d'image pour, si le dispositif d'imagerie est fixé, effectuer un second traitement d'image pour permettre la détection du gaz à détecter avec une précision supérieure à celle du premier traitement d'image ; et une unité de commande pour commander les première et seconde unités de traitement d'image de façon à effectuer sélectivement le premier ou le second traitement d'image.
PCT/JP2019/044254 2019-11-12 2019-11-12 Dispositif de détection de gaz, procédé de commande de traitement d'image et programme de commande de traitement d'image WO2021095112A1 (fr)

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PCT/JP2019/044254 WO2021095112A1 (fr) 2019-11-12 2019-11-12 Dispositif de détection de gaz, procédé de commande de traitement d'image et programme de commande de traitement d'image

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PCT/JP2019/044254 WO2021095112A1 (fr) 2019-11-12 2019-11-12 Dispositif de détection de gaz, procédé de commande de traitement d'image et programme de commande de traitement d'image

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130113939A1 (en) * 2011-11-07 2013-05-09 Flir Systems Ab Gas visualization arrangements, devices, and methods
WO2017073430A1 (fr) * 2015-10-29 2017-05-04 コニカミノルタ株式会社 Dispositif de traitement d'image pour détection de gaz, procédé de traitement d'image pour détection de gaz et programme de traitement d'image pour détection de gaz
US20180335380A1 (en) * 2017-05-16 2018-11-22 Fluke Corporation Optical gas imaging systems and methods
GB2567246A (en) * 2017-10-09 2019-04-10 Csir A gas detection system and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130113939A1 (en) * 2011-11-07 2013-05-09 Flir Systems Ab Gas visualization arrangements, devices, and methods
WO2017073430A1 (fr) * 2015-10-29 2017-05-04 コニカミノルタ株式会社 Dispositif de traitement d'image pour détection de gaz, procédé de traitement d'image pour détection de gaz et programme de traitement d'image pour détection de gaz
US20180335380A1 (en) * 2017-05-16 2018-11-22 Fluke Corporation Optical gas imaging systems and methods
GB2567246A (en) * 2017-10-09 2019-04-10 Csir A gas detection system and method

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