EP3662315A1 - Dispositif optique pour l'observation d'un habitacle de véhicule - Google Patents
Dispositif optique pour l'observation d'un habitacle de véhiculeInfo
- Publication number
- EP3662315A1 EP3662315A1 EP18750152.3A EP18750152A EP3662315A1 EP 3662315 A1 EP3662315 A1 EP 3662315A1 EP 18750152 A EP18750152 A EP 18750152A EP 3662315 A1 EP3662315 A1 EP 3662315A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- driver
- resolution
- optical device
- high resolution
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0093—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/0153—Passenger detection systems using field detection presence sensors
- B60R21/01538—Passenger detection systems using field detection presence sensors for image processing, e.g. cameras or sensor arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/59—Context or environment of the image inside of a vehicle, e.g. relating to seat occupancy, driver state or inner lighting conditions
Definitions
- the present invention relates to an optical device, for the observation of a vehicle passenger compartment, and more particularly to the users present in said passenger compartment.
- Motor vehicles in particular those with automated driving, may include optical devices, in particular cameras, directed at the driver and the passengers, in particular at the front of the vehicle, the shooting of which makes it possible to establish indicators as to the presence and / or current status of a user, driver or passenger.
- optical devices in particular cameras, directed at the driver and the passengers, in particular at the front of the vehicle, the shooting of which makes it possible to establish indicators as to the presence and / or current status of a user, driver or passenger.
- Such optical devices generally comprise a high resolution camera, with a narrow angle of view (30 to 60 °), directed towards the expected position of the driver's face of the vehicle (upper part of the driver's seat).
- the camera records high resolution images of the driver's face, and a control unit extracts said images from the estimates, particularly with respect to a driver's level of alertness.
- control unit can in particular establish a direction of the driver's gaze (towards the front, towards a side window, on an object inside the passenger compartment ...) and / or a number of eyelid blinks per unit of time to assess a driver's state of fatigue and level of attention to surrounding traffic.
- the optical devices include cameras with a wide angle of view (greater than 8o °) and low resolution, to observe the entire cabin or at least its front portion. These cameras with a wide angle of view, especially with a spherical optics are generally directed towards the center of the passenger compartment, so as to observe both the driver and passenger seats.
- a control unit connected to said wide-angle camera then uses the captured images to establish the presence of an adult passenger.
- Wide angle cameras often arranged at a console central or a ceiling of the vehicle, can also or alternatively be used to perform a gesture recognition for a gesture recognition control module.
- the two types of camera (low angle and high resolution against wide angle at low resolution) can not, a priori, be combined into a single optical device.
- the subject of the invention is an optical device for observing a user and a space surrounding the user, comprising:
- an optical objective defining an optical axis and an image plane
- a matrix of optical sensors disposed in the image plane of the objective
- the center of the optical sensor array is disposed eccentrically with respect to the optical axis of the optical lens.
- An optical field-of-view device is thus obtained with a portion in high resolution eccentric in a controlled manner as needed, and allowing simultaneous observation of two portions of the observed space with two levels of resolution: a high resolution around the optical axis and a lower resolution on the edges of the field of view.
- the optical device can then have one or more of the following characteristics taken alone or in combination.
- the offset between the center of the optical sensor array and the optical axis of the optical lens is between o, id, and od, where d is the spatial extent of the array of optical sensors in the optical plane. 'picture.
- the distortion of the lens is barreled and increasing with the deviation of the incident rays relative to the optical axis.
- the array of optical sensors is for example a rectangular matrix of diagonal optical sensors d.
- the optical objective is configured so that the image plane comprises a portion of high resolution, in particular circular and centered around the optical axis, and an annular portion of lower resolution surrounding the high resolution portion.
- the resolution in the high resolution zone is greater than a value of between three and ten pixels per degree of angle.
- the resolution in the annular area can be between a low value of 0.3-1.0 pixels per degree of angle and a high resolution value at the boundary with the high resolution portion.
- the array of optical sensors is disposed with a vertex of the rectangle disposed on the image circle corresponding to the low resolution value.
- the subject of the invention is also a module for monitoring the state of attention of a driver of a vehicle and for detecting the presence of a driver.
- passenger characterized in that it comprises an optical device as defined above, and in that the optical axis of the objective is directed towards an expected position of the face or the bust of the driver or a passenger of the vehicle.
- the monitoring module may have one or more of the following features, taken alone or in combination.
- control unit configured to isolate in the portion of the array of optical sensors contained in the high resolution portion of the characteristics of the driver's face such as:
- control unit configured to isolate in the images from the matrix of optical sensors specific gestures performed by the driver and / or the passenger for the control of vehicle functions.
- FIG. 1 diagrammatically shows an optical device arranged in a passenger compartment of a motor vehicle
- FIG. 2 schematically shows the passenger compartment in plan view with a optical device and the associated field of view
- FIG. 3 shows in more detail the optical device
- FIG. 4 is a graph illustrating the angular resolution of a barrel distortion lens, according to the angle of incidence
- FIG. 5 is a diagram of the image plane of the objective, with examples of arrangement of an array of optical sensors in it,
- FIGS. 6a and 6b show two examples of array layout of optical sensors in the image plane of the objective
- Figures 7a, 7b schematically show two different arrangements of an optical device in a cockpit side view.
- the optical elements in particular the lenses used, have an invariance by rotation about an optical axis Ox, which makes it possible to define a longitudinal direction.
- the image plane of the optical device makes it possible to define, with local gravity, transverse directions Oy and vertical Oz.
- Figure 1 schematically shows a passenger compartment 1 of a motor vehicle with an optical device 100.
- the optical device 100 is here installed at the center console of the vehicle: the front wall vertical or inclined, located between the driver and the passenger at the front of the vehicle. This location allows the driver, who is here the user U of the optical device 100, to be in the field of view of the optical device 100 in the normal driving position.
- the optical device 100 may be installed at a ceiling lamp module or at or in the rear-view mirror.
- the optical device 100 is for example part of a monitoring module of the state of vigilance of the driver and detection of the presence of a passenger.
- a monitoring module can be used both to determine a level of attention of the driver U and to establish the presence or absence of a passenger, and for example the possible size of the passenger for the selective activation of passenger airbags .
- the optical device 100 may be part of a gesture recognition control module.
- Such a control module allows the control of at least one function of a member of the motor vehicle by performing specific gestures in the field of view of the optical device 100, functions such as the control of an air conditioning system, an audio system, a telephony system or a navigation assistant.
- the control module can also be used for window regulators, exterior mirrors, moving power seats, interior lights, central locking, sunroof, hazard lights, lights of atmosphere or the handbrake.
- FIG. 2 is also a diagrammatic representation in more detail of the optical device 100.
- the passenger compartment comprises a driver's seat 3 and a passenger seat 5, arranged on each side of a central console 7, here in particular comprising a display screen 9.
- the optical device 100 comprises an objective lens 101 with one or more lenses defining an optical axis Ox, and an optical sensor matrix 103.
- the array of optical sensors 103 is arranged parallel to the focal plane of the optical objective 101 in the image plane of the optical objective 101 and therefore perpendicular to the optical axis Ox.
- the optical lens 101 presents spatially variable distortion. According to an exemplary embodiment, this is a wide angle lens according to one embodiment an optical or at least one spherical lens.
- Such wide-angle lenses have a very short focal length, in particular with a large and spherical convex face, so that a viewing angle is very important, typically of the order of 10 ° and more.
- the optical objective law has for example a barrel distortion, that is to say that the rays incident at a high angle with respect to the optical axis are concentrated on a zone of less surface in the objective image plane optical law. Objects on the periphery of the field of view will appear as compressed.
- the optical device 100 may further comprise means for positioning and translating the objective lens along the optical axis Ox, to allow dynamic focusing.
- the optical axis Ox of the objective lens is directed towards the expected position of the conductor U, and more particularly of the face and / or the bust thereof, that is to say at the of the headrest of the driver's seat 3, this, as will be described later to allow observation at high resolution.
- the array of optical sensors 103 is for example a CCD (charge coupled device) matrix or a matrix of a CMOS sensor comprising a matrix of miniature photodiodes.
- the optical sensor array 103 is in particular rectangular.
- the optical sensor array 103 has a grid of sensors individual optics, with each optical sensor being associated one or more pixels of the image captured by the optical sensor array 103.
- the optical sensor array 103 is disposed in the image plane of the lens 101, eccentrically, that is to say that the center C of the optical sensor array 103 is off-center and thus offset from the optical axis of the optical lens 101.
- the center C of the optical sensor matrix 103 is offset from the optical axis Ox in the direction of the driver's seat 3.
- the field of view of the optical device 100 is then asymmetrical, with a greater viewing angle on the side of the passenger seat 5 which is then also observed by the optical device 100.
- the field of view of the optical device 100 can then be divided into three conical, vertex zones situated at the center O of the lens 101.
- the three zones comprise two zones of low resolution LD separated by a zone High resolution HD centered on the Ox optical axis.
- the lower resolution area LD on the left in FIG. 2 has an angular aperture smaller than the low resolution zone LD on the right.
- the optical sensor array 103 is disposed eccentrically with respect to the optical axis Ox, with an offset ⁇ in the image plane of the objective 101.
- the image captured by the sensor array 103 corresponds to the field of view of the camera, which is in the form of a crown cone O, delimited by the projection of the edges of the array of optical sensors 103. Due to the shift ⁇ (here downwardly in the image of FIG. 3) with respect to the optical axis Ox, said cone is asymmetrical with respect to the optical axis Ox.
- the objective 101 has a greater angular resolution around its optical axis Ox, so that by the arrangement of the optical sensor matrix 103 with respect to the optical axis Ox of the objective, the high resolution HD area of the field of view is eccentrically.
- the lower resolution area LD located below the high resolution area HD is cone-shaped with less angular aperture than the lower resolution area LD situated above the high resolution area HD.
- FIG. 4 is a graph of the resolution R in pixels per degree of field of view (px / °), as a function of the angle ⁇ of observation with respect to the optical axis Ox.
- the resolution of a lens 101 with conventional barrel deformation is, at least around the origin, in the form of a convex curve, symmetrical with respect to the ordinate axis.
- a pixel must correspond to an angular aperture of approximately 0.15 ° (arctan (o, oo3)), ie a resolution of the order of the order of six pixels per degree of field of view.
- a resolution of one centimeter is required. Considering that the passenger is at a distance of about one meter from the optical device 100, a pixel must correspond to an angular aperture of about 1.5 ° (arctan (o, oi)), ie a resolution of the order of 0.6 pixels per degree.
- FIG. 5 is a representation of the image plane of the objective 101, with two axes corresponding to the directions y (ordinate) and z (dimension).
- two concentric circles 11, 13 are represented, corresponding to the resolution points respectively worth RLD for the outer circle 11 and RHD for the inner circle 13.
- RLD resolution point
- RHD resolution point
- the diameter of the outer circle 11 is denoted D in the image plane.
- the disk contained in this outer circle 11 corresponds to the portion of the exploitable image plane to obtain images with a resolution greater than the low resolution value RLD-
- the resolution is greater than RHD and between the inner circle 131 and the outer circle 11, the resolution is between RHD and RLD, at the boundary of the high resolution area HD defined by the circle. Inside 13, the resolution worth RHD.
- optical sensor array 103 Two examples of optical sensor array 103 are shown in FIG. 5, referenced 103a and 103b with their respective centers Ca and Cb.
- the extension d of the rectangle occupied by the optical sensor matrix 103 is smaller than the diameter of the image circle D corresponding here to the outer circle 11 to allow it to be decentered in the outer circle 11 .
- optical sensor array 103a is of reduced diagonal d, equal to 3D / 4.
- the second example of optical sensor array 103b is diagonal d equal to D / 2.
- the optical sensor matrices 103a, 103b are arranged in the outer circle 11 with their upper right-hand top in contact with said outer circle 11.
- the diagonal values d for the optical sensor matrices 103 preferably between 0.5.0 and o, gD allow a shift ⁇ , in particular between o, id and o, yd, with respect to the centered position. capable of capturing both an image of the driver U in high resolution and the rest of the passenger compartment 1, in a lower resolution but higher than the low resolution value RLD.
- optical sensor matrix 103 may also be used, for example a shape refined at the edges, taking into account the barrel distortion of the final image obtained.
- Figures 6a and 6b illustrate the shift of the array of optical sensors 103 relative to a centered position.
- Figures 6a, 6b show the image plane portion of the lens 101, with the outer circles 11 and inner 13 corresponding to the areas of lower resolution LD and high resolution HD.
- the offset is only in y (ordinate), in FIG. 6b the offset ⁇ further comprises a component ⁇ ⁇ in z (dimensions).
- the optical sensor array 103 is shifted to the left in the image plane relative to the centered position, shown in dashed lines.
- the shift 5 y along the abscissa axis allows to adjust the position of the cone of vision in high resolution HD in the field of view of the optical device 100 in the horizontal plane xOy ( Figure 2).
- the array of optical sensors 103 and the optical objective 101 are sized and arranged so that the array of optical sensors 103 completely contains the circular portion of the image plane of the lens 101.
- the offset ⁇ of the optical sensor matrix 103 comprises a component 5 y along the abscissa axis y, and a component 5 Z along the axis of the dimensions z.
- FIGS. 7a and 7b illustrate the effect of the component ⁇ ⁇ along the axis of the dimensions z of the shift ⁇ and its application.
- Figures 7a, 7b schematically show a passenger compartment 1 of a motor vehicle, in side view, in which is essentially visible the driver seat 3, with the driver U sitting on and holding the steering wheel of the motor vehicle.
- the optical device 100 is disposed at the level of the central console 7 of the vehicle, at the height of the vehicle steering wheel.
- the overall field of view of said device 100 has an angular opening from the driver's pelvis U to the driver's hands U placed on the steering wheel.
- the high resolution portion of said field of view, hatched in FIG. 7a, is centered on the driver's face, and is relatively in the middle of the overall field of view.
- the vertical component ⁇ ⁇ of the offset ⁇ is then small or zero, which corresponds to the arrangement of FIG. 6a.
- the optical device 100 is disposed at a ceiling or a central rearview mirror of the vehicle.
- the overall field of vision of the vehicle has an angular aperture from the top of the skull of the driver U to the hands of the driver U placed on the steering wheel.
- the high-resolution portion of said field of view, hatched in Figure 7b, is centered on the driver's face, and is therefore almost at the highest in the global field of vision.
- the portion located under the high-resolution portion of low-resolution field of view, which covers the torso of the driver U, his arms and his hands resting on the steering wheel is larger than the low-resolution portion above the hatched high resolution portion, which is almost non-existent.
- the optical sensor array 103 is connected to a control unit (not shown) including in particular an image processing unit.
- control unit comprises calculation means and an electronic memory.
- the control unit may in particular be dedicated or integrated in a global electronic circuit of the vehicle.
- control unit can control one or more functional modules of the vehicle by means of electronic actuators (integrated circuits, transistors, logic switches).
- the control unit receives the images recorded by the optical sensor array 103 and analyzes them to extract data relating to the driver.
- control unit can extract information relating to one or more characteristics of the conductor U, of its behavior. and its physiological state.
- control unit can derive from the images a direction of the driver's gaze U, in particular if he looks towards the front of the vehicle, if he looks at a point located in the cockpit, or if he looks by a side window.
- control unit can trigger the emission of an alert, either with indicator lights, the display of a message on a screen or the transmission of a sound by the vehicle's multimedia playback system.
- control unit can analyze the open or closed state of the eyes of the driver U, and by tracking over a predetermined period of time, to deduce a frequency of blinking of the eyelids of the driver U.
- the control can trigger the emission of a sound, particularly acute or shrill, to wake up the driver U possibly asleep, and / or invite him to pay attention to the traffic.
- a high or increasing frequency of blinking of the eyes or yawning of the driver U can trigger the display or audio playback of a message inviting the driver to pause or change places with the passenger.
- control unit can use data extracted from the low-resolution portion of the field of view of the optical device 100, such as the position of the bust of the driver U, the position of his hands, especially in relation to the steering wheel.
- control unit can extract passenger data, such as its presence or absence, as well as its size.
- the passenger data can be used to selectively activate a portion of the passenger, front and side airbags, depending on the presence and size of the detected passenger.
- control unit can be configured to isolate in the images specific gestures, in particular in a defined space of the passenger compartment (for example in front of the display screen 9 or the central console 7), corresponding to the control various functions of the vehicle (multimedia device, navigation assistant, interior and exterior lighting).
- the optical device according to the invention requires only a slight oversizing of the lens relative to the optical sensor array 103, and can in particular use a conventional wide-angle optical lens 101.
- the device is invariant by rotation around the optical axis Ox, and therefore easy to set up.
- the optical device 100 and the monitoring module obtained by means of the latter are more compact and less expensive than a solution combining two cameras, a wide angle and a high resolution, while allowing a two-level observation simultaneous resolution.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Mechanical Engineering (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Studio Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1757310A FR3069657A1 (fr) | 2017-07-31 | 2017-07-31 | Dispositif optique pour l'observation d'un habitacle de vehicule |
| PCT/EP2018/070803 WO2019025469A1 (fr) | 2017-07-31 | 2018-07-31 | Dispositif optique pour l'observation d'un habitacle de véhicule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3662315A1 true EP3662315A1 (fr) | 2020-06-10 |
Family
ID=60888469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18750152.3A Withdrawn EP3662315A1 (fr) | 2017-07-31 | 2018-07-31 | Dispositif optique pour l'observation d'un habitacle de véhicule |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3662315A1 (fr) |
| CN (1) | CN110945400A (fr) |
| FR (1) | FR3069657A1 (fr) |
| WO (1) | WO2019025469A1 (fr) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5835613A (en) * | 1992-05-05 | 1998-11-10 | Automotive Technologies International, Inc. | Optical identification and monitoring system using pattern recognition for use with vehicles |
| JP3766145B2 (ja) * | 1996-10-16 | 2006-04-12 | 株式会社日本自動車部品総合研究所 | 車室内状況検出装置 |
| JP4658899B2 (ja) * | 2006-10-24 | 2011-03-23 | 本田技研工業株式会社 | 車両の乗員検知装置 |
| CN101930161B (zh) * | 2009-08-28 | 2014-06-18 | 杭州普维光电技术有限公司 | 一种全景成像调整方法和装置以及全景成像装置 |
| DE102010044449B4 (de) * | 2009-12-31 | 2014-05-08 | Volkswagen Ag | Erkennen des Grades der Fahrfähigkeit des Fahrers eines Kraftfahrzeugs |
| DE102011089195A1 (de) * | 2011-06-30 | 2013-01-03 | Johnson Controls Gmbh | Vorrichtung und Verfahren zur berührungslosen Erfassung von Gegenständen und/oder Personen und von diesen ausgeführten Gesten und/oder Bedienvorgängen |
| DE102013002111B4 (de) * | 2013-02-08 | 2021-11-18 | Mekra Lang Gmbh & Co. Kg | Sichtsystem für Fahrzeuge, insbesondere Nutzfahrzeuge |
| US20150379362A1 (en) * | 2013-02-21 | 2015-12-31 | Iee International Electronics & Engineering S.A. | Imaging device based occupant monitoring system supporting multiple functions |
| KR101537936B1 (ko) * | 2013-11-08 | 2015-07-21 | 현대자동차주식회사 | 차량 및 그 제어방법 |
| KR101534742B1 (ko) * | 2013-12-10 | 2015-07-07 | 현대자동차 주식회사 | 차량용 제스처 인식 시스템 및 그 방법 |
| US20160021309A1 (en) * | 2014-07-21 | 2016-01-21 | Honeywell International Inc. | Image based surveillance system |
| US9533687B2 (en) * | 2014-12-30 | 2017-01-03 | Tk Holdings Inc. | Occupant monitoring systems and methods |
| US10044932B2 (en) * | 2015-03-13 | 2018-08-07 | Sensormatic Electronics, LLC | Wide angle fisheye security camera having offset lens and image sensor |
| US10829072B2 (en) * | 2015-04-10 | 2020-11-10 | Robert Bosch Gmbh | Detection of occupant size and pose with a vehicle interior camera |
| DE102015213769A1 (de) * | 2015-07-22 | 2017-01-26 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Prädizieren einer Blickrichtung eines Fahrzeuginsassen |
-
2017
- 2017-07-31 FR FR1757310A patent/FR3069657A1/fr not_active Withdrawn
-
2018
- 2018-07-31 WO PCT/EP2018/070803 patent/WO2019025469A1/fr not_active Ceased
- 2018-07-31 EP EP18750152.3A patent/EP3662315A1/fr not_active Withdrawn
- 2018-07-31 CN CN201880049387.6A patent/CN110945400A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019025469A1 (fr) | 2019-02-07 |
| CN110945400A (zh) | 2020-03-31 |
| FR3069657A1 (fr) | 2019-02-01 |
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