WO2014131920A1 - Procédé et dispositif de mesure et de calcul de paramètres colorimétriques d'objets éclairés et de sources lumineuses - Google Patents

Procédé et dispositif de mesure et de calcul de paramètres colorimétriques d'objets éclairés et de sources lumineuses Download PDF

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Publication number
WO2014131920A1
WO2014131920A1 PCT/ES2013/070128 ES2013070128W WO2014131920A1 WO 2014131920 A1 WO2014131920 A1 WO 2014131920A1 ES 2013070128 W ES2013070128 W ES 2013070128W WO 2014131920 A1 WO2014131920 A1 WO 2014131920A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
measurement
illuminated object
colorimetric parameters
calculation
Prior art date
Application number
PCT/ES2013/070128
Other languages
English (en)
Spanish (es)
Inventor
José Antonio GUTIÉRREZ MÉNDEZ
Alberto Mansilla Gallo
Jesús Ángel REAL CORTÉS
Original Assignee
Fundación Cidaut
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 Fundación Cidaut filed Critical Fundación Cidaut
Priority to PCT/ES2013/070128 priority Critical patent/WO2014131920A1/fr
Publication of WO2014131920A1 publication Critical patent/WO2014131920A1/fr

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Classifications

    • 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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/505—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by lighting fixtures other than screens, monitors, displays or CRTs
    • 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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/506—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by screens, monitors, displays or CRTs

Definitions

  • the present invention relates to a
  • the procedure is dynamic and measures the
  • the device is a mobile system that includes at least one light sensor with spectral response at different wavelengths of the spectrum
  • Illuminated objects and light sources can be found on the road in the form of panels, signs, "cat eyes”, road markings, on walls and asphalt in tunnels, etc.
  • objects externally illuminated
  • those illuminated from within denoted internally illuminated
  • those not illuminated or externally in reference to the specific focus, or internally.
  • the light sources it is understood as such the road lighting, the luminous panels of variable message (PMV) or fixed (such as traffic lights or others), or other light signals that can be found on the road (such as vertical signs) of circulation -or others- where on its surface they have point lights -led or similar- or continuous -light strips-).
  • PMV variable message
  • fixed such as traffic lights or others
  • other light signals that can be found on the road (such as vertical signs) of circulation -or others- where on its surface they have point lights -led or similar- or continuous -light strips-).
  • a light source is characterized by an electromagnetic spectrum. From it, multiple parameters are calculated, such as the color temperature, which is the temperature at which a black body would have a color similar to the sample.
  • the sun resembles a black body with a temperature of 5700K in its
  • the electromagnetic spectrum depends on many aspects, mainly the temperature of the emitting source (filaments in the case of a light bulb) and the nature of the materials (gases, halides, etc.).
  • the solar radiation depends on the filter of the atmosphere, so the radiation varies depending on the cloudiness, it is as if the temperature of the surface of the sun changed.
  • the measurement of color is complicated since, depending on the spectral emission of the sun, the measurement of the color can vary.
  • the colorimetry is calculated, according to the regulations, for an illumination of a black body at 2856 K, precisely the emission of a classic tungsten filament lamp.
  • Other color measurement systems for example for vertical traffic signals, are based on illuminants D65, temperature of a black body at 6500K.
  • the color depends a lot on the illuminant. A white object can be seen the color you want, illuminating it with a font
  • the chromatic coordinates with different illuminants may not be additive so they must be converted to a single lighting system.
  • the chromatic coordinates do not depend on the amount of light they emit, but in our case, when they are illuminated, we must know how much the external source contributes to the color (amount of light). This amount of light should be measured with a luxometer.
  • the international lighting committee, CIE aware of this problem, has developed various mathematical tools to translate the chromatic coordinates of one illuminant to another. These tools are usually linear systems (matrices).
  • the controlled scenario of a laboratory does not allow the assessment of the state of the illuminated objects and light sources to be made based on magnitudes measured in service conditions, that is, in dynamic conditions and in environments where external lighting is not controllable.
  • US6674878 color images are used in a system to determine the retroreflectivity of reflective surfaces arranged along a pathway for
  • a processing system identifies a section of the values of
  • the intensity of the object is measured in the foreground, and that of the background, using an intensity algorithm, the luminances are determined. With these, the characterization of the light source and the color chart of the object and the background, the retroreflectivity of the object and the background is obtained.
  • the present invention relates to a method of measurement and calculation of colorimetric parameters
  • the invention has the objective of measuring and calculating performance indicators
  • the objective of the invention is to know the colorimetric parameters of an illuminated object or light source under another illuminant different from the ambient, and to do it in a dynamic way.
  • Said procedure is for measuring and calculating colorimetric parameters, such as chromatic coordinates in different color spaces, color temperature, Color Rendering Index or CRI, etc.
  • Said procedure is carried out on any illuminated object and light source.
  • ambient lighting of any type, natural, such as the sun, or artificial, which may be, in some cases, negligible the value of said ambient lighting.
  • the device for the measurement and calculation of colorimetric parameters of any illuminated object and light source includes a mobile system characterized in that it comprises a system for measuring the external illumination and a light sensor with response to different lengths of light. wave of the visible electromagnetic spectrum, directed towards the field of vision of the mobile system, and, optionally, as a help has a global positioning system, one of inertial navigation and computer systems.
  • An advantage of the invention is that it allows to measure and calculate the necessary parameters for the review or evaluation of the illuminated objects and the light sources in a direct way, directly measuring the physical parameter. As well as that it can be done automatically, without intervention by the user once set up, or it is also possible manually, intervening the user in the different stages, for all the illuminated objects and light sources that appear in a scene and in service.
  • Figure 1 represents a view of a vehicle as a mobile system, equipped to carry out the described procedure on an illuminated object or light source, circulating and approaching it.
  • the present invention relates to a method and a device for measuring and calculating colorimetric parameters of any illuminated object and light source (1).
  • the objects and light sources (1) can be arranged along a track (2), which can be of any type, such as a street, road or tunnel, or even rail. They can also be of any type, such as variable message light panels, internal or externally illuminated signs, road lighting of any kind, such as streets, roads and tunnels, traffic lights, vertical signs and beacons, etc.
  • the object of the invention is to know the colorimetric parameters of said illuminated object or light source (1) under a different illuminant, for example a normalized standard illuminant, and to do it in a dynamic way.
  • the colorimetric parameters for example the chromatic coordinates
  • the colorimetric parameters in any type of measurement system of color, such as the CIE (x, y), of the elements that make up the object illuminated or the light source (1) under ambient lighting conditions, as the chromatic coordinates can not be added directly, they must all be measured with the same illuminant.
  • a blue material illuminated with a red laser will not have blue color but will look black, but if it is illuminated with "white" light it will look blue.
  • a set of colorimetric parameters is measured in a total or partial area of the illuminated object or light source (1.1) by means of at least one light sensor (5) with response to different wavelengths of the visible electromagnetic spectrum , directed towards the field of vision of the mobile system (3).
  • colorimetric parameters for example the chromatic coordinates
  • CIE color measurement system
  • colorimetric of the elements of the object or of the light source for a level of luminous intensity of the standardized or prefixed illuminant, that is to say, in a third stage the colorimetric parameters are calculated in the total or partial area of the illuminated object or light source (1.1 ), for any type of desired illumination E n and with an illuminant with spectrum F n ⁇ X),
  • the procedure is dynamic because it is applied in motion, for example on the road itself when it is a vehicle, and without altering the traffic, that is, it is not necessary to close the road during the application of the vehicle. dynamic procedure.
  • Colorimetric images are acquired through images, which are obtained through multiple light sensors
  • the device used to measure external lighting from the mobile system (3) is a luxometer (7), although it could be any other.
  • the measured value of E r will be assumed to be similar to that of the ob ete or light source (1). Said measurement can be performed at distances or at known time intervals, which, although not necessary, is beneficial to obtain the measured values with greater accuracy.
  • data can be acquired from other sensors (6), such as: GPS, odometer, temperature, humidity or others.
  • the position data will preferably be acquired by a global positioning system (8) and inertial navigation (9).
  • These data may be acquired at distances or at known time intervals, synchronized or not, with a sufficiently high frequency or data rate.
  • the control of switching off and on of the elements of the light source or illuminated object (1) can be done manually or taking advantage of the flickering of said sources.
  • a European 50 Hz lamp is turned off and on 100 times per second.
  • a regulation of LED panels, although it could be any other, indicates that the frequency of switching off and on must be greater than 90 Hz. Therefore, it would suffice to use a data collection higher than this frequency or data collection techniques conveniently separated from one another in such a way as to be sufficient for the purpose.
  • this procedure is also valid for any ignition frequency (excessively high and even zero) that the light sources may have, and the existing lighting of the environment and the lighting system used for the illuminated objects.
  • the calculated values it will be possible to review or evaluate the indicators of good functioning of the illuminated objects and light sources (1) in a direct way, that is, by dynamically measuring the physical parameter in the environment of uncontrolled natural light, without having to travel to a laboratory. As well as, perform it automatically, without the intervention of a user, for all the illuminated objects and light sources (1) that appear in a scene and / or in
  • the illuminated objects and light sources (1) can be arranged, like the mobile system (3), along any linear infrastructure of
  • the device for the measurement and calculation of colorimetric parameters of any illuminated object and light source (1) includes a mobile system (3) that at least comprises an external lighting measurement system (7) and a light sensor (5) with response to different
  • wavelengths of the visible electromagnetic spectrum directed towards the field of vision of the mobile system (3).
  • a global positioning system (8) an inertial navigation system (9), computer systems (10).
  • the most usual option is to be a luxometer.
  • another sensor (6) can be included, such as an odometer, a temperature sensor and / or a humidity sensor.
  • the light sensor (5) can be a digital color camera or black and white camera with suitable filters.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

Procédé et dispositif de mesure et de calcul de paramètres colorimétriques d'un quelconque objet éclairé et d'une source lumineuse. Le procédé est dynamique et mesure l'éclairage ambiant, une zone totale ou partielle de l'objet éclairé ou de la source lumineuse et calcule les paramètres colorimétriques dans ladite zone totale ou partielle pour un quelconque type d'éclairage souhaité, ce qui élimine la contribution de l'éclairage ambiant. Le dispositif est un système mobile qui comprend au moins un capteur de lumière avec une réponse spectrale à différentes longueurs d'onde du spectre électromagnétique visible.
PCT/ES2013/070128 2013-03-01 2013-03-01 Procédé et dispositif de mesure et de calcul de paramètres colorimétriques d'objets éclairés et de sources lumineuses WO2014131920A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2013/070128 WO2014131920A1 (fr) 2013-03-01 2013-03-01 Procédé et dispositif de mesure et de calcul de paramètres colorimétriques d'objets éclairés et de sources lumineuses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2013/070128 WO2014131920A1 (fr) 2013-03-01 2013-03-01 Procédé et dispositif de mesure et de calcul de paramètres colorimétriques d'objets éclairés et de sources lumineuses

Publications (1)

Publication Number Publication Date
WO2014131920A1 true WO2014131920A1 (fr) 2014-09-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661248A1 (fr) * 1990-04-20 1991-10-25 France Etat Ponts Chaussees Procede et dispositif de mesure en continu et a lumiere ambiante de la retroflexion d'un marquage routier et du contraste.
US20040160595A1 (en) * 2003-02-14 2004-08-19 Lafarge Road Marking, Inc. Road marking evaluation and measurement system
US20060195278A1 (en) * 2005-02-15 2006-08-31 Lianza Thomas A System and method for applying correction factors related to ambient conditions
WO2009034515A2 (fr) * 2007-09-11 2009-03-19 Philips Intellectual Property & Standards Gmbh Capteur à compensation de la lumière ambiante et procédure de compensation de la lumière ambiante
EP2244084A1 (fr) * 2008-02-12 2010-10-27 Fundación Cidaut Procédé de détermination de luminance de panneaux de signalisation et dispositif pour sa mise en oeuvre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661248A1 (fr) * 1990-04-20 1991-10-25 France Etat Ponts Chaussees Procede et dispositif de mesure en continu et a lumiere ambiante de la retroflexion d'un marquage routier et du contraste.
US20040160595A1 (en) * 2003-02-14 2004-08-19 Lafarge Road Marking, Inc. Road marking evaluation and measurement system
US20060195278A1 (en) * 2005-02-15 2006-08-31 Lianza Thomas A System and method for applying correction factors related to ambient conditions
WO2009034515A2 (fr) * 2007-09-11 2009-03-19 Philips Intellectual Property & Standards Gmbh Capteur à compensation de la lumière ambiante et procédure de compensation de la lumière ambiante
EP2244084A1 (fr) * 2008-02-12 2010-10-27 Fundación Cidaut Procédé de détermination de luminance de panneaux de signalisation et dispositif pour sa mise en oeuvre

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