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WO2014115144A1 - Amélioration de précision de mesure infrarouge dans une zone spécifiée - Google Patents

Amélioration de précision de mesure infrarouge dans une zone spécifiée Download PDF

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Publication number
WO2014115144A1
WO2014115144A1 PCT/IL2014/050080 IL2014050080W WO2014115144A1 WO 2014115144 A1 WO2014115144 A1 WO 2014115144A1 IL 2014050080 W IL2014050080 W IL 2014050080W WO 2014115144 A1 WO2014115144 A1 WO 2014115144A1
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WO
WIPO (PCT)
Prior art keywords
area
infrared
imaging system
specified
visible light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IL2014/050080
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English (en)
Inventor
Ernest Grimberg
Alexander Burd
Yossi Cohen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Opgal Optronics Indudtries Ltd
Original Assignee
Opgal Optronics Indudtries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Opgal Optronics Indudtries Ltd filed Critical Opgal Optronics Indudtries Ltd
Publication of WO2014115144A1 publication Critical patent/WO2014115144A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6814—Head
    • A61B5/6821—Eye
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
    • G01J5/0025—Living bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G01J5/047—Mobile mounting; Scanning arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0859—Sighting arrangements, e.g. cameras
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077—Imaging

Definitions

  • the present invention relates to the field of infrared imagery, and more particularly, to enhancing the accuracy of infrared measurements.
  • Figure 1 is a schematic illustration of an eye 90, showing the eyelid 91, the sclera 81, the iris 82 and the limbus 92, which is the sclerocorneal junction on the edge of the iris, an area that is characterized by low blood supply.
  • One embodiment of the present invention provides an imaging system comprising: (i) a visible light imaging system arranged to capture a specified area and having a pixel size selected to be larger than a blur circle of optics of the visible light imaging system within a specified range, to yield a given depth focusing range with respect to the specified area; (ii) an infrared imaging system arranged to capture the specified area; (iii) a controller arranged to move the visible light imaging system together with the infrared imaging system until a first reference area within the specified area, having an infrared contrast to its surrounding above a first specified threshold, is in focus of the infrared imaging system and/or high contrast features in the first reference area coincide on the images of both systems; (iv) a processor arranged to fuse the captured visible light image with the infrared image using the first reference area as depicted by both imaging systems, to yield a fused image having a visible light component and an infrared component; and (v) an infrared image processor, arranged to compare
  • Figure 1 is a schematic illustration of a human eye
  • Figure 2 is a high level schematic block diagram of an imaging system imaging the eye, according to some embodiments of the invention.
  • Figure 3 is a high level flowchart illustrating a method of enhancing infrared measurement accuracy in a specified area, according to some embodiments of the invention.
  • Figure 2 is a high level schematic block diagram of an imaging system 100 imaging eye 90, according to some embodiments of the invention.
  • Imaging system 100 comprises a visible light imaging system 110 and an infrared imaging system 120, both arranged to capture a specified area such as the eye.
  • visible light imaging system 110 and infrared imaging system 120 may be positioned at an angle to each other and set at spatial relationships that provide focusing of both systems 110, 120 at an intersection of their optical axes.
  • Infrared imaging system 120 may be set perpendicular to the eye's plain (along lines 111 and 121 respectively, with the optical axis of eye 90 similar to the optical axis of infrared imaging system 120), and visible light imaging system 110 may be set at a small angle to infrared imaging system 120 and to the eye's optical axis.
  • Visible light imaging system 110 is arranged to have large pixels relative to the lens blur circle, in order to yield a wide depth focusing range 111 with respect to the specified area.
  • the focusing range of visible light imaging system 110 may be 5 cm to 15 cm from the eye.
  • Depth focusing range 111 is defined by the range within which the blur circle of the optics of visible light imaging system 110 is smaller than the pixel size of the imaging array. The pixel size is selected to yield depth focusing range 111 that is appropriate for the application.
  • the pixel size is selected to be larger than a blur circle of optics of visible light imaging system 110 within a specified range, to yield a given depth focusing range 111 with respect to the specified area.
  • the pixel size may be selected to be 10-12 ⁇ , to include the blur circle within the pixel over al least the whole range 111.
  • Imaging systems 110, 120 are movably controlled by a controller 130, e.g. by means of a controllable mechanical apparatus (not shown). The whole imaging systems 110, 120 are moved (and not just their optics) in order to move the intersection of their optical axes until it falls in the specified area, which is indicated by the congruence of the images from systems 110, 120. Controller 130 is arranged to move visible light imaging system 110 together with infrared imaging system 120 while maintaining the set spatial relationships between them, until a first reference area 91 having high contrast thermal features (e.g.
  • a fold in the eyelid) within the specified area is in focus of infrared imaging system 120 and/or the images of systems 110, 120 coincide on the high contrast features of first reference area 91, indicating that first reference area 91 is at the intersection of the optical axes of systems 110, 120.
  • the coincidence of the images assures that both images are focused at the right distance from the target, e.g. eye 90.
  • First reference area 91 is selected as an area the exhibits an infrared contrast to its surrounding above a first specified threshold (e.g. 0.1 °C) that is well detectable by infrared imaging system 120 and is further approximately in a focal plane 121 of a target region of system 100 (see below). Additional image processing methods may be used to ensure congruence of the infrared and visible light images.
  • a first specified threshold e.g. 0.1 °C
  • Imaging system 100 may further include a processor 140 arranged to fuse the captured visible light image with the infrared image using first reference area 91 as depicted by both imaging systems 110, 120, to yield a fused image 145 having a visible light component and an infrared component. Both components are well focused, as infrared imaging system 120 is focused on focal plane 121 as described above and visible light imaging system 110 was selected to be focused over a wide range of focal lengths 111 around the specified area. Finally, imaging system 100 comprises an infrared image processor 150, arranged to compare infrared measurements of the target region in the specified area with infrared measurements of a second reference area 92 (e.g. the sclerocorneal limbus) within the specified area.
  • a second reference area 92 e.g. the sclerocorneal limbus
  • Second reference area 92 is selected as a region having a constant temperature in respect to the state that is to be identified. For example, if inflammation is to be identified, second reference area 92 is selected to have a temperature that is least influenced by the inflammation, such as a region having low blood supply (measurable eye diseases are not limited to inflammation, and may include other cases in which minute temperature differences are diagnostic, such as dryness and other conditions such as mentioned in Tan et al. 2009 cited above).
  • Infrared measurements may comprise, in addition to temperature and temperature differences, also geometric features of the specified area (e.g. size and dimensions, area such as pupil size in case of the eye, reflectance, etc.).
  • System 100 does not measure a distance to the specified area, but identifies a position of the specified area at a pre-calibrated distance that is determined by the preset spatial relationship between the cameras (imaging systems 110, 120). System 100 identifies the correct position by a coinciding of visible light and infrared images of the specified area. The position identification is used to ensure focusing of infrared system 120 at second reference area 92.
  • Second reference area 92 is determined according to the visible light component of fused image 145, and is useful as a reference region for fine measurements by infrared imaging system 120.
  • infrared image processor 150 is arranged to identify a temperature difference below a second specified threshold (e.g. 0.01°C) thus enhancing infrared measurement accuracy in a specified area, and allowing the diagnosis of previously non- measurable conditions.
  • a second specified threshold e.g. 0.01°C
  • first specified threshold may be within the range of 0.1-0.3°C (100-300 m°K) while second specified threshold may be within the range of 0.01-0.03°C (10-30 m°K). That is, selecting and using reference areas 91 and 92 enables an increase of an order of magnitude in the achievable infrared temperature resolution using existing infrared imaging system 120.
  • Further applications may comprise medical treatment in fields such as gynecology, plastic surgery and cardiac surgery, imaging in the chemical industries such as biochemical and food industrial factories, as well as water related imaging for example for monitoring water stress in plants or detecting water leaks etc.
  • reference areas 91 and 92 In each field of application, reference areas 91 and 92 must be carefully selected to be within a single plain and exhibit the corresponding thresholds (namely a first threshold that can be easily detected and a second threshold that can be detected only assuming infrared focus achieved using visible light imaging system 110.
  • first reference area 91 may be cutting edges or structure feature or differences (like nipple location) that can be used for focus adjustment. Damage to blood vessels may be minimized by using the system to thermally detect blood vessels, using a vessel-less area as second reference area 92.
  • slight thermal differences may be used to indicate the level of water stress in a plant, and thus detection thereof may be used as an irrigation monitoring device, e.g. in viticulture.
  • Figure 3 is a high level flowchart illustrating a method 200 of enhancing infrared measurement accuracy in a specified area, according to some embodiments of the invention.
  • Method 200 enhances infrared measurement accuracy in a specified area (stage 210) by carrying out the following stages: configuring a visible light imaging system to have a pixel size that is larger than a blur circle of optics of the visible light imaging system within a specified range, to yield a given depth focusing range with respect to the specified area (stage 220); setting the visible light imaging system and an infrared imaging system, each having an optical axis, at spatial relationships that provide focusing of both systems at an intersection of their optical axes (stage 222); selecting a first reference area having high contrast thermal features within the specified area, having an infrared contrast to its surrounding above a first specified threshold (stage 225), e.g.
  • stage 230 moving the visible light imaging system together with an infrared imaging system while maintaining the set spatial relationships between them, until the first reference area is at the intersection of the optical axes and the high contrast thermal features of the first reference area coincide on both images generated by the visible and infrared imaging systems (stage 230); capturing a visible light image and an infrared image of the specified area (stage 235); fusing the captured visible light image and infrared image using the first reference area (stage 240); determining a second reference area within the specified area according to the visible light component of the fused image (stage 245); comparing infrared measurements of a target region in the specified area with infrared measurements of the second reference area (stage 250); and identifying temperature differences below a second specified threshold between the target region and the second reference area (stage 255) e.g. 0.01 °C.
  • method 200 may comprise setting the infrared imaging system with its optical axis perpendicular to the specified area.
  • method 200 may be configured to detect thermally a water level in a plant.
  • the specified area may be a skin area
  • the first reference area may be a cutting edge or a structural feature in the skin area
  • the second reference area may be a vessel-less area in the skin area.
  • System 100 and method 200 enhance infrared measurement accuracy and thereby allow remote diagnostics of various states that are characterized by minute temperature difference, beyond the capabilities of current infrared imaging systems.
  • System 100 and method 200 utilize the exact fusing of a visible light image and an infrared image, achieved by identifying a well contrasting infrared region within a focused visible light image, to visually identify an uninfluenced target region that serves as a reference region for infrared temperature difference measurements. Using this reference allows enhancing the resolution of the infrared imaging an order of magnitude.
  • Embodiments of the invention may include features from different embodiments disclosed above, and embodiments may incorporate elements from other embodiments disclosed above.
  • the disclosure of elements of the invention in the context of a specific embodiment is not to be taken as limiting their used in the specific embodiment alone.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Radiation Pyrometers (AREA)
  • Image Processing (AREA)

Abstract

La présente invention porte sur l'amélioration de précision de mesure infrarouge et autorisant ainsi des diagnostics à distance de différents états qui sont caractérisés par une différence de température minuscule, au-delà des capacités de systèmes d'imagerie infrarouge actuels. Des modes de réalisation de la présente invention utilisent la fusion exacte d'une image de lumière visible et d'une image infrarouge, obtenue par réglage du système à une relation spatiale connue dans laquelle elles sont toutes les deux focalisées au niveau de l'intersection de leurs axes optiques, et l'identification d'une région infrarouge bien contrastée dans une image de lumière visible focalisée, pour identifier visuellement une région cible non influencée qui sert en tant que région de référence pour mesures infrarouges de différence de température. L'utilisation de cette référence autorise l'amélioration de la résolution de l'imagerie infrarouge d'un ordre de grandeur.
PCT/IL2014/050080 2013-01-28 2014-01-22 Amélioration de précision de mesure infrarouge dans une zone spécifiée Ceased WO2014115144A1 (fr)

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US201361757564P 2013-01-28 2013-01-28
US61/757,564 2013-01-28

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WO2014115144A1 true WO2014115144A1 (fr) 2014-07-31

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107945149A (zh) * 2017-12-21 2018-04-20 西安工业大学 增强IHS‑Curvelet变换融合可见光和红外图像的汽车抗晕光方法
CN110567582A (zh) * 2018-06-06 2019-12-13 深圳市凯利博实业有限公司 体温测量装置和方法
CN111289110A (zh) * 2020-02-14 2020-06-16 北京都是科技有限公司 人体温度检测方法、系统、装置及热红外图像处理器
CN111780877A (zh) * 2020-07-06 2020-10-16 广东智芯光电科技有限公司 一种基于摄像头测物体温度的方法和系统
CN112773325A (zh) * 2020-12-31 2021-05-11 北京市环境保护科学研究院 一种巴西龟眼炎的早期预警方法及系统
CN113327290A (zh) * 2021-06-07 2021-08-31 深圳市商汤科技有限公司 双目模组标定方法、装置、存储介质及电子设备
CN118710519A (zh) * 2024-08-28 2024-09-27 杭州高德智感数字科技有限公司 图像融合方法、目标检测方法、监控方法、介质及无人机

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US20110262053A1 (en) * 2010-04-23 2011-10-27 Flir Systems Ab Infrared resolution and contrast enhancement with fusion

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US6664528B1 (en) * 2001-07-06 2003-12-16 Palantyr Research, Llc Imaging system and methodology employing reciprocal space optical design
US20040008867A1 (en) * 2001-07-06 2004-01-15 Howard Fein Imaging system, methodology, and applications employing reciprocal space optical design
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107945149A (zh) * 2017-12-21 2018-04-20 西安工业大学 增强IHS‑Curvelet变换融合可见光和红外图像的汽车抗晕光方法
CN107945149B (zh) * 2017-12-21 2021-07-20 西安工业大学 增强IHS-Curvelet变换融合可见光和红外图像的汽车抗晕光方法
CN110567582A (zh) * 2018-06-06 2019-12-13 深圳市凯利博实业有限公司 体温测量装置和方法
CN111289110A (zh) * 2020-02-14 2020-06-16 北京都是科技有限公司 人体温度检测方法、系统、装置及热红外图像处理器
CN111780877A (zh) * 2020-07-06 2020-10-16 广东智芯光电科技有限公司 一种基于摄像头测物体温度的方法和系统
CN112773325A (zh) * 2020-12-31 2021-05-11 北京市环境保护科学研究院 一种巴西龟眼炎的早期预警方法及系统
CN112773325B (zh) * 2020-12-31 2023-08-01 北京市环境保护科学研究院 一种巴西龟眼炎的早期预警方法及系统
CN113327290A (zh) * 2021-06-07 2021-08-31 深圳市商汤科技有限公司 双目模组标定方法、装置、存储介质及电子设备
CN113327290B (zh) * 2021-06-07 2022-11-11 深圳市商汤科技有限公司 双目模组标定方法、装置、存储介质及电子设备
CN118710519A (zh) * 2024-08-28 2024-09-27 杭州高德智感数字科技有限公司 图像融合方法、目标检测方法、监控方法、介质及无人机

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