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WO2014053740A1 - Method of determination of a characterized zone of a glazing - Google Patents

Method of determination of a characterized zone of a glazing Download PDF

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Publication number
WO2014053740A1
WO2014053740A1 PCT/FR2013/052229 FR2013052229W WO2014053740A1 WO 2014053740 A1 WO2014053740 A1 WO 2014053740A1 FR 2013052229 W FR2013052229 W FR 2013052229W WO 2014053740 A1 WO2014053740 A1 WO 2014053740A1
Authority
WO
WIPO (PCT)
Prior art keywords
zone
area
glass
image
sub
Prior art date
Application number
PCT/FR2013/052229
Other languages
French (fr)
Inventor
Rafael ALVES
Original Assignee
Peugeot Citroen Automobiles Sa
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 Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Priority to BR112015006901A priority Critical patent/BR112015006901A2/en
Publication of WO2014053740A1 publication Critical patent/WO2014053740A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor
    • B60S1/0844—Optical rain sensor including a camera
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/60—Analysis of geometric attributes
    • G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30248—Vehicle exterior or interior

Definitions

  • the present invention generally relates to a method of locating a characterized area contained in a larger area, and determining its surface.
  • the automotive application described herein is that of the determination of a demisted and / or defrosted area of a window on a motor vehicle and a computer program for implementing this method.
  • Document DE 102005046512 describes a method and a device for analyzing the performance of a de-icing system on a motor vehicle.
  • This device comprises an infrared camera 5, 6 for acquiring images of a windshield 3 and controlled by a computer 7.
  • the analysis consists in calculating a temperature distribution on the infrared image by drawing isothermal curves.
  • this system based on a temperature detection requires the use of an element Protects against temperature variations and light, such as a large curtain.
  • this system is based on temperature differences, it is unusable to detect fogged areas of those defogged, to the extent that the temperature of these zones does not characterize them.
  • the processing of the collected data is also done via the graph paper method.
  • An object of the present invention is to meet the disadvantages of the documents of the prior art mentioned above and in particular, first of all, to propose a method for calculating a glass area and its surface contained in a second window area accurate, efficient and easy to implement.
  • a first aspect of the invention relates to a method for determining a first zone of glass and its surface contained in a second zone of window intended to be implemented on a motor vehicle, characterized in that it comprises a first step of acquiring an image of the glass pane by means of a photographic sensor and a second step of calculating the surface of the first zone of the pane, characterized in that the image is acquired in the visible range, and in that the second step comprises the following sub-steps: digitization of the acquired image, search of the first zone on the digitized image representing opacity of the window pane different from that of the second zone, measurement of the area of the first zone, comparing the area of the first zone with an overall surface of the window.
  • the second step further comprises a sub-step of locating at least one boundary between the first and second areas to detect edges of the first area. In this way it is possible to obtain location data of the measured areas.
  • the second step further comprises a sub-step of comparing the boundary with a predetermined position on the window.
  • the second step further comprises a second substep of comparing a result obtained in the first comparison sub-step with a predetermined threshold.
  • the second step is repeated automatically until the result obtained reaches said predetermined threshold.
  • the process is fast and simple to implement.
  • the photographic sensor is a CCD / CMOS camera. In this way, we can limit costs and obtain good quality images.
  • the first zone is a demisted area and / or de-iced.
  • the defrosted and / or demisted area of the window it is possible to directly measure the defrosted and / or demisted area of the window.
  • the glass is a windshield or a window glass of the motor vehicle.
  • the method can be used indifferently for different applications.
  • a second aspect of the invention relates to a computer program for implementing the method of the first aspect of the invention.
  • a final aspect of the invention relates to a device for determining a first zone of glass and its surface contained in a second zone of window co m taking a photog raphic sensor and a computer executing the computer program according to the second aspect of the invention.
  • FIG. 1 represents a flowchart illustrating the steps of a first embodiment of the method of the present invention.
  • FIG. 2 represents a flowchart illustrating the substeps of the second step of the first embodiment of the method of the present invention.
  • FIG. 3 represents a flowchart illustrating the substeps of the second step of a second embodiment of the method of the present invention.
  • Figures 4A and 4B show a windshield on which is implemented the method of the present invention.
  • FIG. 1 shows the steps of a first embodiment of the method for determining demisted and / or defrosted glass surfaces of the present invention.
  • This method is intended to be implemented on a motor vehicle and comprises a first step S101 of acquiring an image of the window in the visible range, that is to say in the wavelength range of 350 at less than 780 nm, by means of a photographic sensor, for example a CCD / CMOS camera, and a second step S102 for calculating the defogged and / or defrosted surface of the window.
  • a photographic sensor for example a CCD / CMOS camera
  • FIG. 2 represents the sub-steps constituting the second step S102 of FIG.
  • the first substep S201 is a substep of digitization of the acquired image so that it can be processed by computer. This digitization can be simultaneous with the acquisition of the image, when using a digital camera, for example.
  • the second sub-step is a substep of searching for a first area on the digitized image representing opacity of the pane different from that of a second area so as to identify and differentiate a first area which may be opaque, c ' that is to say, frosted and / or misted, or transparent, that is to say defrosted and / or demisted, a second which will be transparent or opaque, respectively.
  • the third substep S204 is a substep of measuring the area of the first area preceding a fourth substep S205 of comparing the area of the first area measured with an overall area of the pane that can be calculated or identified. previously, for example.
  • the second step S102 further comprises a fifth substep S206 which consists of a second substep of comparing a result obtained at the first comparison substep S205 with a predetermined threshold, and preferably the second step S102 is repeated automatically until the result achieved reaches said predetermined threshold.
  • Fig. 3 shows the substeps of the second step S102 of a second embodiment of the method of the present invention.
  • the second step S102 corresponds to that of the first embodiment, which further comprises a sub-step S203 for locating at least one boundary between the first and second zones so as to detect edges of the first zone with respect to the second zone. It is therefore possible to locate the first area on the glass.
  • a sub-step S207 for comparing the boundary with a predetermined position, preferably a viewing zone, on the window makes it possible to know whether the demisted or defrosted zone is situated on the viewing zone or not, so as to obtain qualitative demisting or defrosting data.
  • Figures 4A and 4B show a car windshield at two different times.
  • a first zone A corresponding to a deembired and / or de-iced zone which increases from FIGS. 4A to 4B as time progresses will be noted.
  • a second zone B corresponding to a fogged or frosted area and a zone C corresponding to the predetermined zone of vision.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Method of determination of a first zone of glazing and of its surface contained in a second zone of glazing intended to be implemented on a motor vehicle, characterized in that it comprises a first step (S101) consisting in acquiring an image of the glazing by means of a photographic sensor and a second step (S102) of calculating the surface area of the first zone of the glazing, characterized in that the image is acquired in the visible region, and in that the second step comprises the following substeps: digitization (S201) of the image acquired, search (S202) for the first zone (A) on the digitized image representing an opacity of the glazing different from that of the second zone (B), measurement (S204) of the area of the first zone, comparison (S205) of the area of the first zone with an overall surface area of the glazing.

Description

Procédé de déterm i nation de zone caractérisée d 'u ne vitre  Zone determination method characterized by a window
La présente invention concerne de manière générale un procédé de repérage d'une zone caractérisée contenue dans une zone plus étendue, et de détermination de sa surface. L'application automobile ici décrite est celle de la détermination d'une zone désembuée et/ou dégivrée d'une vitre sur un véhicule automobile et un programme d'ordinateur destiné à mettre en œuvre ce procédé. The present invention generally relates to a method of locating a characterized area contained in a larger area, and determining its surface. The automotive application described herein is that of the determination of a demisted and / or defrosted area of a window on a motor vehicle and a computer program for implementing this method.
Il est connu dans l'art antérieur des dispositifs et des procédés de détermination de zone dégivrée et/ou désembuée d'une vitre qui utilisent la méthode dite du papier millimétré. Cette méthode consiste à utiliser du papier millimétré pour mesurer, pendant un essai de désembuage, la surface embuée ou givrée, dite « mouillée », en calculant l'aire de chaque cadran du papier millimétré correspondant à la surface mouillée, et en faisant un rapport entre la masse de papier associé à l'aire mesurée et la surface totale pour obtenir un pourcentage de surface totale. Cependant, cette méthode présente de nombreux inconvénients dont celui de fournir des résultats incertains, de présenter une variation d'erreur élevée et de nécessiter un temps d'analyse relativement long.  It is known in the prior art devices and methods for determining a defrosted area and / or demisted glass that use the so-called graph paper method. This method consists of using graph paper to measure, during a defogging test, the fogged or frosted surface, so-called "wet", by calculating the area of each dial of the graph paper corresponding to the wet surface, and making a report between the mass of paper associated with the area measured and the total area to obtain a percentage of total area. However, this method has many drawbacks including that of providing uncertain results, presenting a high error variation and requiring a relatively long analysis time.
Il a donc été nécessaire d'effectuer des recherches pour trouver des procédés de calcul de zone dégivrée et/ou désembuée d'une vitre plus précis et plus faciles à mettre en œuvre.  It has therefore been necessary to carry out research to find deicing methods of deicing and / or defogging a window more accurate and easier to implement.
Le document DE 102005046512 décrit un procédé et un dispositif d'analyse de performance d'un système de dégivrage sur un véhicule automobile. Ce dispositif comprend une caméra infrarouge 5, 6 destinée à acquérir des images d'un pare-brise 3 et commandée par un ordinateur 7. L'analyse consiste à calculer une distribution de températures sur l'image infrarouge en traçant des courbes isothermes. Cependant, ce système se basant sur une détection de température nécessite l'utilisation d'un élément protecteur contre les variations de température et la lumière, tel qu'un grand rideau. De plus, puisque ce système se base sur des différences de température, il est inutilisable pour détecter des zones embuées de celles désembuées, dans la mesure où la température de ces zones ne les caractérise pas. Enfin, dans ce système, le traitement des données récoltées se fait également via la méthode du papier millimétré. Document DE 102005046512 describes a method and a device for analyzing the performance of a de-icing system on a motor vehicle. This device comprises an infrared camera 5, 6 for acquiring images of a windshield 3 and controlled by a computer 7. The analysis consists in calculating a temperature distribution on the infrared image by drawing isothermal curves. However, this system based on a temperature detection requires the use of an element Protects against temperature variations and light, such as a large curtain. In addition, since this system is based on temperature differences, it is unusable to detect fogged areas of those defogged, to the extent that the temperature of these zones does not characterize them. Finally, in this system, the processing of the collected data is also done via the graph paper method.
Le document US 7609857 décrit un système de détection d'obstructions sur le pare-brise telles que de la pluie, de la poussière ou de la neige. Il est cependant inadapté pour détecter et calculer l'évolution d'un système de ventilation dans le temps.  Document US 7609857 describes a system for detecting obstructions on the windshield such as rain, dust or snow. However, it is unsuitable for detecting and calculating the evolution of a ventilation system over time.
Un but de la présente invention est de répondre aux inconvénients des documents de l'art antérieur mentionnés ci-dessus et en particulier, tout d'abord, de proposer un procédé de calcul d'une zone de vitre et de sa surface contenue dans une seconde zone de vitre précis, efficace et qui soit facile à mettre en œuvre.  An object of the present invention is to meet the disadvantages of the documents of the prior art mentioned above and in particular, first of all, to propose a method for calculating a glass area and its surface contained in a second window area accurate, efficient and easy to implement.
Pour cela un premier aspect de l'invention concerne un procédé de détermination d'une première zone de vitre et de sa surface contenue dans une seconde zone de vitre destiné à être mis en œuvre sur un véhicule automobile, caractérisé en ce qu'il comprend une première étape consistant à acquérir une image de la vitre au moyen d'un capteur photographique et une seconde étape de calcul de la surface de la première zone de la vitre, caractérisé en ce que l'image est acquise dans le domaine du visible, et en ce que la seconde étape comprend les sous étapes suivantes : numérisation de l'image acquise, recherche de la première zone sur l'image numérisée représentant une opacité de la vitre différente de celle de la seconde zone, mesure de l'aire de la première zone, comparaison de l'aire de la première zone avec une surface globale de la vitre. Ainsi, il est possible de mesurer des surfaces de vitres désembuées et/ou dégivrées, de manière simple, sans avoir à se protéger d'interférences dues à la chaleur ou aux rayons du soleil.  For this purpose, a first aspect of the invention relates to a method for determining a first zone of glass and its surface contained in a second zone of window intended to be implemented on a motor vehicle, characterized in that it comprises a first step of acquiring an image of the glass pane by means of a photographic sensor and a second step of calculating the surface of the first zone of the pane, characterized in that the image is acquired in the visible range, and in that the second step comprises the following sub-steps: digitization of the acquired image, search of the first zone on the digitized image representing opacity of the window pane different from that of the second zone, measurement of the area of the first zone, comparing the area of the first zone with an overall surface of the window. Thus, it is possible to measure demisted and / or defrosted glass surfaces in a simple manner, without having to protect themselves from interference due to heat or sunlight.
De manière avantageuse, la seconde étape comprend en outre une sous étape de localisation d'au moins une frontière entre les première et seconde zones de sorte à détecter des bords de la première zone. De cette manière il est possible d'obtenir des données de localisation des zones mesurées. Advantageously, the second step further comprises a sub-step of locating at least one boundary between the first and second areas to detect edges of the first area. In this way it is possible to obtain location data of the measured areas.
De manière avantageuse la seconde étape comprend en outre une sous étape de comparaison de la frontière avec une position prédéterminée sur la vitre. Ainsi, il est possible de mesurer qualitativement les zones désembuées et/ou dégivrées pour les comparer aux normes.  Advantageously, the second step further comprises a sub-step of comparing the boundary with a predetermined position on the window. Thus, it is possible to qualitatively measure the demisted and / or de-iced zones to compare them to the norms.
Avantageusement, la seconde étape comprend en outre une seconde sous étape de comparaison d'un résultat obtenu à la première sous étape de comparaison avec un seuil prédéterminé. Ainsi, il est possible d'obtenir de calibrer un moyen de désembuage ou dégivrage en fonction du résultat.  Advantageously, the second step further comprises a second substep of comparing a result obtained in the first comparison sub-step with a predetermined threshold. Thus, it is possible to obtain the calibration of defogging or deicing means according to the result.
Avantageusement, la seconde étape est répétée automatiquement jusqu'à ce que le résultat obtenu atteigne ledit seuil prédéterminé. Ainsi, le procédé est rapide est simple à mettre en œuvre.  Advantageously, the second step is repeated automatically until the result obtained reaches said predetermined threshold. Thus, the process is fast and simple to implement.
Une réalisation particulièrement intéressante consiste en ce que le capteur photographique est une caméra CCD/CMOS. De cette manière, on peut limiter les coûts et obtenir des images de bonne qualité.  A particularly interesting embodiment is that the photographic sensor is a CCD / CMOS camera. In this way, we can limit costs and obtain good quality images.
Une réalisation particulièrement intéressante consiste en ce que la première zone est une zone désembuée et/ou dégivrée. Ainsi, on peut directement mesurer l'aire dégivrée et/ou désembuée de la vitre.  A particularly interesting embodiment is that the first zone is a demisted area and / or de-iced. Thus, it is possible to directly measure the defrosted and / or demisted area of the window.
Avantageusement, la vitre est un pare-brise ou une vitre de projecteur du véhicule automobile. De cette manière, le procédé peut indifféremment être utilisé pour différentes applications.  Advantageously, the glass is a windshield or a window glass of the motor vehicle. In this way, the method can be used indifferently for different applications.
Un second aspect de l'invention concerne un programme d'ordinateur destiné à mettre en œuvre le procédé du premier aspect de l'invention.  A second aspect of the invention relates to a computer program for implementing the method of the first aspect of the invention.
Un dernier aspect de l'invention concerne un dispositif de détermination d'une première zone de vitre et de sa surface contenue dans une seconde zone de vitre co m prenant u n capteu r photog raph ique et u n ordi nateu r exécutant le program me d 'ordi nateu r selon le second aspect de l'invention. A final aspect of the invention relates to a device for determining a first zone of glass and its surface contained in a second zone of window co m taking a photog raphic sensor and a computer executing the computer program according to the second aspect of the invention.
D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description détaillée qui suit d'un mode de réalisation de l'invention donné à titre d'exemple nullement limitatif et illustré par les dessins annexés, dans lesquels :  Other features and advantages of the present invention will appear more clearly on reading the following detailed description of an embodiment of the invention given by way of non-limiting example and illustrated by the appended drawings, in which:
- la figure 1 représente un organigramme illustrant les étapes d'un premier mode de réalisation du procédé de la présente invention.  FIG. 1 represents a flowchart illustrating the steps of a first embodiment of the method of the present invention.
- la figure 2 représente un organigramme illustrant les sous étapes de la seconde étape du premier mode de réalisation du procédé de la présente invention. FIG. 2 represents a flowchart illustrating the substeps of the second step of the first embodiment of the method of the present invention.
- la figure 3 représente un organigramme illustrant les sous étapes de la seconde étape d'un second mode de réalisation du procédé de la présente invention. - les figures 4A et 4B représentent un pare brise sur lequel est mis en œuvre le procédé de la présente invention. FIG. 3 represents a flowchart illustrating the substeps of the second step of a second embodiment of the method of the present invention. - Figures 4A and 4B show a windshield on which is implemented the method of the present invention.
La figure 1 représente les étapes d'un premier mode de réalisation du procédé de détermination de surfaces de vitre désembuées et/ou dégivrées de la présente invention. Ce procédé est destiné à être mis en œuvre sur un véhicule automobile et comprend une première étape S101 consistant à acquérir une image de la vitre dans le domaine du visible, c'est-à-dire dans le domaine de longueur d'onde de 350 à moins de 780 nm, au moyen d'un capteur photographique, par exemple une caméra CCD/CMOS, et une seconde étape S102 de calcul de la surface désembuée et/ou dégivrée de la vitre. Grâce à ce procédé, il est possible de surveiller l'évolution du désembuage et/ou dégivrage d'une vitre, idéalement mais pas obligatoirement sur un pare-brise ou un projecteur de véhicule, de manière à l'optimiser.  FIG. 1 shows the steps of a first embodiment of the method for determining demisted and / or defrosted glass surfaces of the present invention. This method is intended to be implemented on a motor vehicle and comprises a first step S101 of acquiring an image of the window in the visible range, that is to say in the wavelength range of 350 at less than 780 nm, by means of a photographic sensor, for example a CCD / CMOS camera, and a second step S102 for calculating the defogged and / or defrosted surface of the window. With this method, it is possible to monitor the evolution of defogging and / or defrosting of a window, ideally but not necessarily on a windshield or vehicle headlight, so as to optimize.
La figure 2 représente les sous étapes constituant la seconde étape S102 de la figure 1 . La première sous étape S201 est une sous étape de numérisation de l'image acquise de sorte à ce qu'elle puisse être traitée par ordinateur. Cette numérisation peut être simultanée à l'acquisition de l'image, lorsque l'on utilise un appareil photographique numérique, par exemple. La seconde sous étape est une sous étape de recherche d'une première zone sur l'image numérisée représentant une opacité de la vitre différente de celle d'une seconde zone de sorte à identifier et différencier une première zone qui peut être opaque, c'est-à-dire givrée et/ou embuée, ou transparente, c'est-à-dire dégivrée et/ou désembuée, d'une seconde qui sera transparente ou opaque, respectivement. La troisième sous étape S204 est une sous étape de mesure de l'aire de la première zone qui précède une quatrième sous étape S205 de comparaison de l'aire de la première zone mesurée avec une surface globale de la vitre qui peut être calculée ou identifiée préalablement, par exemple. De préférence, la seconde étape S102 comprend en outre une cinquième sous étape S206 qui consiste en une seconde sous étape de comparaison d'un résultat obtenu à la première sous étape de comparaison S205 avec un seuil prédéterminé, et de préférence la seconde étape S102 est répétée automatiquement jusqu'à ce que le résultat obtenu atteigne ledit seuil prédéterminé. FIG. 2 represents the sub-steps constituting the second step S102 of FIG. The first substep S201 is a substep of digitization of the acquired image so that it can be processed by computer. This digitization can be simultaneous with the acquisition of the image, when using a digital camera, for example. The second sub-step is a substep of searching for a first area on the digitized image representing opacity of the pane different from that of a second area so as to identify and differentiate a first area which may be opaque, c ' that is to say, frosted and / or misted, or transparent, that is to say defrosted and / or demisted, a second which will be transparent or opaque, respectively. The third substep S204 is a substep of measuring the area of the first area preceding a fourth substep S205 of comparing the area of the first area measured with an overall area of the pane that can be calculated or identified. previously, for example. Preferably, the second step S102 further comprises a fifth substep S206 which consists of a second substep of comparing a result obtained at the first comparison substep S205 with a predetermined threshold, and preferably the second step S102 is repeated automatically until the result achieved reaches said predetermined threshold.
La figure 3 représente les sous étapes de la seconde étape S102 d'un second mode de réalisation du procédé de la présente invention. Dans ce second mode de réalisation, la seconde étape S102 correspond à celle du premier mode de réalisation qui comprend en outre une sous étape S203 de localisation d'au moins une frontière entre les première et seconde zones de sorte à détecter des bords de la première zone par rapport à la seconde zone. Il est donc possible de localiser la première zone sur la vitre. Suite à cela, une sous étape S207 de comparaison de la frontière avec une position prédéterminée, de préférence une zone de vision, sur la vitre permet de savoir si la zone désembuée ou dégivrée se situe sur la zone de vision ou pas, de sorte à obtenir des données qualitatives du désembuage ou du dégivrage. Les figures 4A et 4B représentent un pare-brise de voiture à deux instants différents. On remarquera sur ces figures, une première zone A correspondant à une zone désembuée et/ou dégivrée qui s'accroit de la figure 4A à 4B à mesure que le temps avance. Sur ces figures est également représentée une deuxième zone B correspondant à une zone embuée ou givrée ainsi qu'une zone C correspondant à la zone prédéterminée de vision. Fig. 3 shows the substeps of the second step S102 of a second embodiment of the method of the present invention. In this second embodiment, the second step S102 corresponds to that of the first embodiment, which further comprises a sub-step S203 for locating at least one boundary between the first and second zones so as to detect edges of the first zone with respect to the second zone. It is therefore possible to locate the first area on the glass. Following this, a sub-step S207 for comparing the boundary with a predetermined position, preferably a viewing zone, on the window makes it possible to know whether the demisted or defrosted zone is situated on the viewing zone or not, so as to obtain qualitative demisting or defrosting data. Figures 4A and 4B show a car windshield at two different times. In these figures, a first zone A corresponding to a deembired and / or de-iced zone which increases from FIGS. 4A to 4B as time progresses will be noted. In these figures is also shown a second zone B corresponding to a fogged or frosted area and a zone C corresponding to the predetermined zone of vision.
On comprendra que diverses modifications et/ou améliorations évidentes pour l'homme du métier peuvent être apportées aux différents modes de réalisation de l'invention décrits dans la présente description sans sortir du cadre de l'invention défini par les revendications annexées. En particulier, il est fait référence aux différents types d'algorithme.  It will be understood that various modifications and / or improvements obvious to those skilled in the art can be made to the various embodiments of the invention described in the present description without departing from the scope of the invention defined by the appended claims. In particular, reference is made to the different types of algorithm.

Claims

R EVE N D I CATI ON S R EVE NDI CATI ON S
1 . Procédé de détermination d'une première zone de vitre désembuée et/ou dégivrée et de sa surface contenue dans une seconde zone de vitre destiné à être mis en œuvre sur un véhicule automobile, caractérisé en ce qu'il comprend une première étape (S101 ) consistant à acquérir une image de la vitre au moyen d'un capteur photographique et une seconde étape (S102) de calcul de la surface de la première zone de la vitre, caractérisé en ce que l'image est acquise dans le domaine du visible, et en ce que la seconde étape comprend les sous étapes suivantes : numérisation (S201 ) de l'image acquise, recherche (S202) de la première zone (A) sur l'image numérisée représentant une opacité de la vitre différente de celle de la seconde zone (B), mesure (S204) de l'aire de la première zone, comparaison (S205) de l'aire de la première zone avec une surface globale de la vitre. 1. Method for determining a first defogged and / or defrosted glass zone and its surface contained in a second zone of glass intended to be implemented on a motor vehicle, characterized in that it comprises a first step (S101) of acquiring an image of the window pane by means of a photographic sensor and a second step (S102) of calculating the area of the first zone of the pane, characterized in that the image is acquired in the visible range, and in that the second step comprises the following sub-steps: digitization (S201) of the acquired image, search (S202) of the first zone (A) on the digitized image representing an opacity of the glass different from that of the second zone (B), measurement (S204) of the area of the first zone, comparison (S205) of the area of the first zone with an overall area of the window.
2. Procédé selon la revendication 1 , caractérisé en ce que la seconde étape (S102) comprend en outre une sous étape (S203) de localisation d'au moins une frontière entre les première (A) et seconde (B) zones de sorte à détecter des bords de la première zone.  2. Method according to claim 1, characterized in that the second step (S102) further comprises a sub-step (S203) for locating at least one boundary between the first (A) and second (B) zones so as to detect edges of the first zone.
3. Procédé selon la revendication 2 comprenant en outre une sous étape de comparaison (207) de la frontière avec une position prédéterminée (C) sur la vitre.  3. The method of claim 2 further comprising a sub step of comparing (207) the boundary with a predetermined position (C) on the glass.
4. Procédé selon l'une des revendications 1 à 3, comprenant en outre une seconde sous étape (S206) de comparaison d'un résultat obtenu à la première sous étape de comparaison (S205) avec un seuil prédéterminé.  4. Method according to one of claims 1 to 3, further comprising a second substep (S206) for comparing a result obtained in the first comparative sub-step (S205) with a predetermined threshold.
5. Procédé selon la revendication 4, caractérisé en ce que la seconde étape (S102) est répétée automatiquement jusqu'à ce que le résultat obtenu atteigne ledit seuil prédéterminé. 5. Method according to claim 4, characterized in that the second step (S102) is repeated automatically until the result obtained reaches said predetermined threshold.
6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le capteur photographique est une caméra CCD/CMOS 6. Method according to one of claims 1 to 5, characterized in that the photographic sensor is a CCD / CMOS camera
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la vitre est un pare-brise ou une vitre de projecteur du véhicule automobile.1  7. Method according to one of claims 1 to 6, characterized in that the glass is a windshield or a motor vehicle headlamp.
8. Programme d'ordinateur destiné à mettre en œuvre le procédé selon l'une des revendications 1 à 7.  8. Computer program for implementing the method according to one of claims 1 to 7.
9. Dispositif de détermination d'une première zone de vitre et de sa surface contenue dans une seconde zone de vitre comprenant un capteur photographique et un ordinateur exécutant le programme d'ordinateur selon la revendication 8.  9. A device for determining a first pane area and its area contained in a second pane area comprising a photographic sensor and a computer executing the computer program according to claim 8.
PCT/FR2013/052229 2012-10-03 2013-09-24 Method of determination of a characterized zone of a glazing WO2014053740A1 (en)

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BR112015006901A BR112015006901A2 (en) 2012-10-03 2013-09-24 first glass zone determination method, computer program for using said first glass zone determination method and device

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FR1259401 2012-10-03
FR1259401A FR2996191B1 (en) 2012-10-03 2012-10-03 METHOD FOR DETERMINING CHARACTERIZED AREA OF A GLASS

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US10112582B2 (en) * 2016-09-14 2018-10-30 Ford Global Technologies, Llc Windshield cleaning system and method
FR3085923B1 (en) * 2018-09-19 2021-04-02 Valeo Systemes Dessuyage SNOW DETECTION DEVICE ON A GLASS SURFACE OF A MOTOR VEHICLE

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US7609857B2 (en) 2002-01-17 2009-10-27 Robert Bosch Gmbh Method and device for recognizing obstruction of view in image sensor systems

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JPH09126998A (en) * 1995-11-02 1997-05-16 Tokai Rika Co Ltd Rain drop sensor and rain-drop-sensitive wiper
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FR2996191A1 (en) 2014-04-04
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