Method and device for controlling an interactive visual interface in order to remedy motion sickness in a rear passenger of a vehicle

Abstract

The present invention relates to a method and a device for controlling a display system on board a vehicle, the method comprising receiving first data which are representative of a radius of curvature of a stretch of road on which the vehicle is travelling and second data which are representative of a speed of the vehicle, and determining the lateral acceleration of the vehicle on the basis of the first and second data. The method also comprises receiving third data which are representative of a current posture of a passenger, and determining an orientation of a virtual graphical object (131) on the basis of the third data. The display of second graphical content is then controlled on a display device (13), the second graphical content comprising first graphical content and the virtual graphical object superimposed on the first graphical content, the first graphical content being dependent on the lateral acceleration of the vehicle.

Description

DESCRIPTION Title: Method and device for controlling an interactive visual interface to remedy the discomfort of a rear passenger in a vehicle. Technical field

[0001] The present invention claims priority from French application 2402212 filed on 05.03.2024, the content of which (text, drawings and claims) is incorporated herein by reference. The present invention relates to methods and devices for controlling an on-board display system in a vehicle, in particular an automobile. The present invention relates more particularly to methods and devices for controlling an interactive visual interface for remedying motion sickness in a vehicle passenger. Technological background

[0002] The advent of autonomous vehicles brings new technological challenges, and passenger comfort is a key issue. Today, one in three people is considered highly susceptible to motion sickness, with children being particularly at risk.

[0003] Currently, no satisfactory solution is used in vehicles to reduce motion sickness. Various publications and / or scientific communications report vertical light strips on either side of a screen to inform passengers of the upcoming trajectory and thus alleviate symptoms. These experimental systems are based on the activation of light strips according to the curvature of the road, for example, previously recorded in an on-board navigation system.

[0004] However, although these systems can have a beneficial effect, vehicle passengers remain subject to motion sickness, particularly because they do not have a clear vision of the upcoming stimulation and this information does not induce changes in their posture. However, if a driver is less sensitive than passengers to motion sickness, it is notably because: • his vision is clear, which also explains why front passengers are less sensitive than rear passengers, • he directs the vehicle, he is therefore able to anticipate the consequences of his actions on the vehicle's controls, and • it is active and modifies its posture according to the vehicle dynamics it anticipates. Summary of the present invention

[0005] An object of the present invention is to solve at least one of the drawbacks of the technological background.

[0006] Another object of the present invention is to provide a solution to help a vehicle passenger combat motion sickness.

[0007] According to a first aspect, the present invention relates to a method for controlling an on-board display system in a vehicle, the display system comprising a display device, the method being implemented by at least one computer and comprising the following steps: - reception of first data representative of a radius of curvature of a portion of road on which the vehicle is traveling and second data representative of a speed of the vehicle; - determination of a lateral acceleration of the vehicle from the first and second data; - reception of third data representative of a current posture of a passenger of the vehicle; - determination of an orientation of a virtual graphic object based on the third data; - controlling the display of a second graphical content on the display device, the second graphical content comprising a first graphical content and the object virtual graphic superimposed on the first graphic content, the first graphic content being a function of the lateral acceleration of the vehicle.

[0008] Such a method makes it possible to encourage a vehicle passenger to adopt a specific posture depending on the curvature of the road. Indeed, the passenger is prompted to orient the virtual graphic object displayed on the display device according to the first graphic content representing the curvature of the portion of road on which the vehicle is traveling. As the driver naturally does, the passenger will lean in the bends so as to orient the virtual graphic object appropriately. The posture that the passenger adopts is then ideal for countering a centrifugal force in the bends and thus reducing motion sickness.

[0009] According to a variant, the method further comprises a step of determining fourth data representative of a reference posture as a function of the lateral acceleration, a characteristic of the virtual graphic object being a function of a result of a comparison of the fourth data with the third data.

[0010] According to another variant, the second graphic content comprises another virtual graphic object determined according to the result of the comparison.

[0011] According to an additional variant, the current posture is determined from an angle of inclination of a head and / or a bust of the passenger determined from an image acquired by a first camera on board the vehicle.

[0012] According to yet another variant, the first data is obtained from a navigation system on board the vehicle.

[0013] According to yet another variant, the first graphic content comprises an image of the portion of road acquired by a second camera on board the vehicle.

[0014] According to an additional variant, the first graphic content is a virtual environment determined by processing the image of the road section.

[0015] According to a second aspect, the present invention relates to a device for controlling an on-board display system in a vehicle, the device comprising a memory associated with a processor configured to implement the steps of the method according to the first aspect of the present invention.

[0016] According to a third aspect, the present invention relates to a vehicle, for example of the automobile type, comprising a device as described above according to the second aspect of the present invention.

[0017] According to a fourth aspect, the present invention relates to a computer program which comprises instructions adapted for executing the steps of the method according to the first aspect of the present invention, in particular when the computer program is executed by at least one processor.

[0018] Such a computer program may use any programming language, and may be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in any other desirable form.

[0019] According to a fifth aspect, the present invention relates to a computer-readable recording medium on which is recorded a computer program comprising instructions for carrying out the steps of the method according to the first aspect of the present invention.

[0020] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium may include a storage medium, such as a ROM memory, a CD-ROM or a microelectronic circuit type ROM memory, or a magnetic recording medium or a hard disk.

[0021] Furthermore, this recording medium may also be a transmissible medium such as an electrical or optical signal, such a signal being able to be conveyed via an electrical or optical cable, by conventional or hertzian radio or by self-directed laser beam or by other means. The computer program according to the present invention may in particular be downloaded from a network such as the Internet.

[0022] Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to perform or to be used in performing the method in question. Brief description of the figures

[0023] Other characteristics and advantages of the present invention will emerge from the description of the particular and non-limiting exemplary embodiments of the present invention below, with reference to the appended figures 1 to 4, in which:

[0024] [Fig. 1] schematically illustrates a road environment of a vehicle, according to a particular and non-limiting exemplary embodiment of the present invention;

[0025] [Fig. 2] schematically illustrates a passenger compartment of the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention;

[0026] [Fig. 3] schematically illustrates a display device on board the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention;

[0027] [Fig. 4] illustrates a flowchart of the different steps of a method for controlling an on-board display system in the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention; and

[0028] [Fig. 5] schematically illustrates a device configured to control an on-board display system in the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention. Description of examples of implementation

[0029] A method and a device for controlling an on-board display system in a vehicle will now be described in the following with joint reference to Figures 1 to 4. The same elements are identified with the same reference signs throughout the description which follows.

[0030] The terms "first(s)", "second(s)" (or "first(s)", "second(s)"), etc. are used in this document by arbitrary convention to identify and distinguish different elements (such as operations, means, etc.) implemented in the embodiments described below. Such elements may be distinct or correspond to a single element, depending on the embodiment.

[0031] According to a particular and non-limiting example of embodiment of the present invention, a method for controlling a display system on board a vehicle is for example implemented by a computer on board the vehicle.

[0032] Indeed, the method comprises receiving first data representative of a radius of curvature of a portion of road on which the vehicle is traveling and second data representative of a speed of the vehicle. A lateral acceleration of the vehicle is then determined from the first and second data.

[0033] The method also includes receiving third data representative of a current posture of a passenger and determining an orientation of a virtual graphical object based on the third data.

[0034] The display of a second graphical content is then controlled on a display device, the second graphical content comprising a first graphical content and the virtual graphical object superimposed on the first graphical content, the first graphical content being a function of the lateral acceleration of the vehicle.

[0035] Figure 1 schematically illustrates a road environment of a vehicle, according to a particular and non-limiting exemplary embodiment of the present invention.

[0036] The vehicle 10 corresponds, for example, to a vehicle with a thermal engine, with an electric motor(s) or even a hybrid vehicle with a thermal engine and one or more electric motors. The vehicle 10 thus corresponds, for example, to a land vehicle, for example a car, a truck, a bus.

[0037] Vehicle 10 corresponds, for example, to a vehicle traveling in an autonomous or semi-autonomous mode. Vehicle 10 travels, for example, according to a level of autonomy greater than or equal to 2, according to the scale defined by the American federal agency which has established 5 levels of autonomy ranging from 1 to 5, level 0 corresponding to a vehicle having no autonomy, the driving of which is under the total supervision of the driver, level 1 corresponding to a vehicle with a minimal level of autonomy, the driving of which is under the supervision of the driver with minimal assistance from an advanced driving assistance system, and level 5 corresponding to a completely autonomous vehicle.

[0038] The 5 levels of autonomy of the classification of the federal agency responsible for road safety are: - level 0: no automation, the vehicle driver has full control over the main functions of the vehicle (engine, accelerator, steering, brakes); - level 1: driver assistance, automation is active for certain vehicle functions, the driver retaining overall control over the vehicle's driving; cruise control is part of this level, as are other aids such as TABS (anti-lock braking system) or ESP (programmed electro-stabilizer); - level 2: automation of combined functions, the control of at least two main functions is combined in the automation to replace the driver in certain situations; for example, adaptive cruise control combined with lane centering allows a vehicle to be classified as level 2, as does automatic parking assistance (from the English “Park assist”); - level 3: limited autonomous driving, the driver can cede complete control of the vehicle to the automated system which will then be in charge of critical safety functions; autonomous driving can however only take place in certain specific environmental and traffic conditions (only on motorways for example); - level 4: fully autonomous driving under certain conditions, the vehicle is designed to ensure all critical safety functions on its own over a complete journey; the driver provides a destination or navigation instructions but is not required to make himself available to take back control of the vehicle; - level 5: completely autonomous driving without driver assistance in all circumstances.

[0039] The vehicle 10 incorporates one or more driver assistance systems, known as ADAS (Advanced Driver-Assistance System). Such ADAS systems are configured to assist, or even replace, the driver of the autonomous vehicle 10 in controlling the vehicle 10 on its route.

[0040] The ADAS systems embedded in the autonomous vehicle 10 are for example supplied by data obtained from one or more embedded sensors, such as for example radars, LIDARs® and / or cameras, and / or data received from a communication infrastructure.

[0041] According to a particular exemplary embodiment, the various computers associated with on-board systems of the vehicle 10, in particular one or more computers responsible for controlling the ADAS systems of the vehicle 10, for example form a multiplexed architecture for the implementation of various services useful for the proper functioning of the vehicle 10 and for assisting the driver and / or passengers of the vehicle in controlling the vehicle 10. The computers and various on-board devices communicate and exchange data with each other via one or more computer buses, for example a communication bus of the CAN (Controller Area Network) type, CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (according to the ISO 17458 standard) or Ethernet (according to the ISO / IEC 802-3 standard).

[0042] The road environment 1 comprises, for example, a portion of road 1001 on which the vehicle 10 is traveling at a current time. This portion of road comprises, for example, a bend characterized by a radius of curvature noted R. It should be noted that the radius of curvature is not necessarily unique; in fact, the bend may become narrower, in which case the radius of curvature decreases as it advances in the bend, or conversely open up, in which case the radius of curvature increases. Similarly, a bend may be defined in an intersection, if the vehicle 10 changes direction. road by turning, for example, to the right at an intersection, then this change of direction to the right is considered a right turn. The invention is however not limited to a turn to the right in the direction of travel of the vehicle 10, the same applies if the turn is to the left in the direction of travel of the vehicle 10.

[0043] The detection and / or determination of the radius of curvature of an upcoming turn for the vehicle 10 can be carried out in different ways. Thus, the vehicle 10 carries, for example, a system for determining a position of the vehicle 10 on the portion of road 1001, called a road positioning system. This system identifies, for example, the traffic lane on which the vehicle 10 is traveling, in particular when the road comprises several traffic lanes, as well as the relative position of the vehicle 10 in this traffic lane. For example, the relative position of the vehicle 10 is determined relative to a central axis of the traffic lane, relative to the position of at least one limit of the traffic lane, for example defined by one or more lines on the ground, by a curb or by a road surface limit.Thus, the road positioning system is able to determine the relative position of the vehicle 10 with respect to the portion of road 1001 and to a traffic lane, as well as the future movements of the vehicle 10 in order to remain on the portion of road 1001, this position and the future movements being for example communicated to computers of the various ADAS systems on board the vehicle 10.

[0044] This position is determined in particular using different sensors and different methods, the road positioning system implementing at least one method belonging to a set of methods including: • a method of recognizing lines on the ground or road signs using a camera and / or lidar; • a satellite positioning method associated with mapping; and • a simultaneous localization and mapping method, called SLAM.

[0045] These methods notably use different technologies such as: - a GPS (from the English "Global Positioning System" or in French "Global Positioning System") which uses signals from satellites orbiting the Earth, the position of the vehicle being determined with relatively high precision high. However, in dense urban environments or areas where the GPS signal is obstructed, for example, under bridges or near tall buildings, GPS may be less reliable; - LiDAR (Light Detection and Ranging), which uses sensors that emit laser beams to measure the distance between the vehicle and surrounding objects. By analyzing the beam reflections, the vehicle's positioning system can map its surroundings in three dimensions and determine its position based on this data. LiDAR sensors can help with precise location, even in varied and changing environments; - a camera 14 installed on the vehicle 10, hereinafter called the second camera 14, for example at the top of its windshield or on a grille, used for visual perception and which can be used for localization by identifying and locating characteristics of the environment. The second camera 14 notably includes in its field of vision the portion of road 1001. A computer vision algorithm makes it possible to analyze the images acquired by the camera 14 to recognize specific elements such as road signs, lines or markings on the ground of the road, traffic lights, thus helping to determine the position of the vehicle 10 on the portion of road 1001; - one or more inertial or motion sensors, measuring acceleration, angular velocity and sometimes magnetism to track the movements of the vehicle 10, being able to estimate the position of the vehicle by calculating its movements and correlating this data with other location information; - High Definition mapping, corresponding to a detailed and precise map of the road environment 1 of the vehicle 10 in which it is located. These maps contain specific information on roads, speed limits or intersections, the road positioning system of the vehicle 10 using this map to compare what it perceives with the cartographic data and determine the position of the vehicle 10 on the road.

[0046] The different location data obtained from different technologies are, for example, merged to improve the accuracy of the position determined by the road positioning system. This system uses, for example: a technique called sensor fusion, where data from multiple sensors (GPS, LiDAR®, cameras, inertial sensors, etc.) are combined and analyzed by algorithms to estimate and improve the accuracy of determining the vehicle's position, including the relative position of the vehicle 10 to the road portion 1001, as well as the vehicle's upcoming movements 10.

[0047] Figure 2 schematically illustrates a passenger compartment of a vehicle, for example of the vehicle of Figure 1, according to a particular and non-limiting exemplary embodiment of the present invention.

[0048] The passenger compartment of the vehicle 10 comprises one or more passenger seats 12, individual or forming part of a bench seat. In the remainder of the description, the term “seat” designates indifferently a seat or a part of a bench seat. A passenger 100 of the vehicle 10 is in particular installed in one of the passenger seats 12.

[0049] The passenger compartment of the vehicle 10 comprises an interior camera 11, hereinafter called the first camera 11. This is for example installed in a central rearview mirror or interior rearview mirror, in a headrest, on a dashboard or in a ceiling light. The first camera 11 is oriented towards the passenger compartment so as to have in its field of vision 111 one or more passengers 100 of the vehicle 10, for example a passenger 100 seated on a second row seat 12. Such a camera is often installed in a passenger compartment in order to fulfill several functions such as observing the interior of the passenger compartment of the vehicle 10 to detect the presence of occupants and / or checking that the seat belt is being worn. Images acquired by the first camera 11 are for example recorded or sent to a computer on board the vehicle 10.

[0050] The passenger compartment of the vehicle 10 comprises an on-board display system comprising a display device 13 hereinafter called screen 13 and a computer configured to control the display of content(s) of a graphical Human Machine Interface, called HMI, on the screen 13. The computer corresponds for example to the computer of the infotainment system, called IVI computer (from the English “In-Vehicle Infotainment” or in French “Infodivertissement embargo”) of the vehicle 10. The screen 13 is by tactile example and corresponds for example to an LCD type screen (from English "Liquid Crystal Display" or in French "Display à cristals liquide"), for example of the TFT type (from the English "Thin-Film Transistor" or in French "Transistor en film mince"), or OLED (from the English "Organic Light-Emitting Diode" or in French "Diode électroluminescente biologique"). The screen is for example arranged in front of the passenger seat 12, for example on the dashboard if it is a front or first row passenger seat and on the back of a seat positioned in front of the passenger seat 12, that is to say at the rear of the back of a seat in the row preceding the passenger seat 12 accommodating the passenger 100, the screen 13 facing the passenger 100.

[0051] According to another particular exemplary embodiment, the screen 13 is a screen worn by the passenger 100 such as a screen of a virtual reality headset or a mixed reality headset, the virtual or mixed reality headset having, for example, a computer receiving information from the vehicle 10 via a wireless link.

[0052] The screen 13 makes it possible to display content intended for the passenger 100 of the vehicle 10. The screen is, according to a particular exemplary embodiment, also configured to allow the driver and / or passengers of the vehicle to interact with one or more systems embedded in the vehicle via a human-machine interface (HMI) displayed on the screen 13. For example, the screen makes it possible to control the infotainment system, also called the IVI (In-Vehicle Infotainment) system of the vehicle, as well as, for example, the system responsible for controlling the display system embedded in the vehicle 10.

[0053] A process for controlling the on-board display system in the vehicle 10 is for example implemented by an on-board computer of the vehicle 10, for example by the computer of the IVI system.

[0054] In a first operation, first data representative of a radius of curvature of the portion of road 1001 on which the vehicle 10 is traveling are received as well as second data representative of a speed of the vehicle 10.

[0055] According to a particular exemplary embodiment, the first and second data are obtained from a navigation system on board the vehicle 10. Indeed, such a system has both the radii of curvature obtained via the mapping for example, and the current speed of the vehicle 10 determined, for example, from its last geographical positions determined by the navigation system.The radius of curvature R of the road portion 1001 is for example obtained from the mapping, the road portion 1001 being determined in advance by the combination of the GPS system and an ADASIS® system (from the English “Advanced Driver Assistance Systems Interface Specification” or in French “Specification of the interface of advanced driver assistance systems”) which makes it possible to know in real time the most probable route, the position of the vehicle, the route alternatives and the road profiles including the radius of curvature of the road portion 1001, the maximum speed or even intersection information. The GPS and ADASIS® systems are in particular interfaced with the communication BUS described above.

[0056] According to another particular exemplary embodiment, the first data are obtained from the positioning system of the vehicle 10, for example from a LiDAR® or from processing of images acquired by the second camera 14, the second data are received from a speed sensor associated with a wheel or a transmission element of the vehicle 10.

[0057] In a second operation, a lateral acceleration of the vehicle 10 is determined from the first and second data. The lateral acceleration makes it possible to evaluate the centrifugal force which applies to a passenger 100 of the vehicle 10 when the vehicle 10 makes a turn, the turn being due to the radius of curvature R of the portion of road 1001 and the centrifugal force being all the greater as the speed of the vehicle 10 in the turn is high.

[0058] According to a particular exemplary embodiment, data representative of a steering wheel angle are also received, making it possible to improve the precision of the estimation of the behavior of the vehicle 10, in particular of the lateral acceleration of the vehicle 10.

[0059] In a third operation, third data representative of a current posture of the passenger 100 of the vehicle 10 are received.

[0060] According to a particular exemplary embodiment, the passenger 100 is positioned in a field of vision 111 of the first camera 11. The current posture of the passenger 100 is then determined from an angle of inclination a of the head and / or the bust of the passenger 100 determined from an image acquired by a first camera 11 on board the vehicle 10. The angle of inclination a of the head and / or the bust is for example measured between a main axis A100 of the head of the passenger 100 relative to a vertical axis V10, the vertical axis Vio being defined in the reference frame of the vehicle 10. According to a variant, the measured angle corresponds to an angle between the axis of the head and an axis defined by the position of the shoulders of the passenger 100.

[0061] The posture of the passenger 100 is for example determined by processing an image acquired by the first camera 11. Such image processing is known to those skilled in the art, and is for example carried out using a machine learning library available in the Python® language of the Mediapipe® type, then making it possible to identify the posture of the passenger via joint markers and to define the angles of inclination of the head and the bust. These head inclination angles are then transmitted, for example, via a UDP link (from the English “User Datagram Protocol” or in French “protocol de datagramme utilisateur”) to the computer in charge of the process of controlling the display system on board the vehicle 10.

[0062] According to another particular embodiment, the camera is of the “Time of Flight” or TOF type (from the English “Time of Flight”).

[0063] In a fourth operation, an orientation of a virtual graphical object 131 is determined based on the third data.

[0064] In order to make the passenger 100 active in his posture, or in other words to generate agency, the posture of the passenger 100 is associated with an orientation corresponding to an attitude of a virtual graphic object which will be projected on the screen 13. The passenger 100 thus controls the attitude of the virtual graphic object 131 by tilting the head and / or bust. The attitude corresponds in particular to the angle of inclination p between a vertical axis V13 of the screen 13 and a main axis A131 associated with the virtual graphic object 131.

[0065] Such a virtual graphic object 131 represents for example a vehicle, for example a land vehicle or a flying object such as a ship, which tilts to take a turn. Such a virtual graphic object is for example represented in Figure 3, which schematically illustrates a display device on board a vehicle, for example in the vehicle of Figure 1, according to a particular and non-limiting exemplary embodiment of the present invention.

[0066] In a fifth operation, a display of a second graphic content is controlled on the display device 13, the second graphic content comprising a first graphic content 132 and the virtual graphic object 131 superimposed on the first graphic content, the first graphic content being a function of the lateral acceleration of the vehicle 10.

[0067] Indeed, the first graphic content 132 aims to represent the radius of curvature R of the portion of road 1001 on which the vehicle 10 is traveling, so that the passenger 100 is aware of this radius of curvature R, or in other words, so that the passenger 100 is aware of the type of bend that he will follow from the vehicle 10 and therefore of the lateral acceleration that he will undergo.

[0068] According to a first particular embodiment, the first graphic content 132 comprises an image of the road portion 1001 acquired by the second camera 14 on board the vehicle 10. Using information allowing a continuously updated anticipation of the future trajectory of the vehicle 10 on the road portion 1001 such as the radius of curvature R of the road portion and the speed of the vehicle 10, this first graphic content is enriched by the integration of visual effects which are generated in real time on the image of the road portion 1001 acquired by the second camera 14 and highlighting the current and upcoming trajectory of the vehicle 10. Thus, the computer applies effects generated by image processing to a video stream originating from the second camera 14, the video stream modified then being broadcast on the screen 13 of the display system intended for passenger 100.

[0069] According to a second particular embodiment, the first graphic content 132 corresponds to a virtual environment determined by processing an image of the road portion 1001 acquired by the second camera 14 on board the vehicle 10 and / or by processing data representative of the topology of the road portion 1001 acquired by an onboard sensor such as a LIDAR®. In this embodiment, the first graphic content 132 is for example configurable and corresponds to a virtual environment selected from a library of virtual environments. Thus, the first graphic content schematically represents the road portion 1001 and its radius of curvature R in the form of a virtual road or a light tunnel positioned in a virtual environment such as a desert, a forest, a city or even space. Such a representation of the road environment 1 is thus simpler to understand and has an entertaining character.The light tunnel is for example composed of a set of doors or graphic objects of ovoid shape arranged along a curve 132a corresponding to the anticipated trajectory of the vehicle 10.

[0070] Thus, by actively tilting his head and / or torso toward the upcoming bend, as the driver does, the passenger controls the attitude of the virtual graphic object 131 displayed on the screen 13, and at the same time adjusts the position of his body on the upcoming trajectory. The head and / or torso of the passenger 100 is then tilted so as to align with the gravito-inertial force that he experiences, that is to say with the resultant force of the vertical gravitational force and the horizontal centrifugal force generated when turning. The passenger is thus active in his own voluntary movement, thus limiting the symptoms of motion sickness.

[0071] According to a particular exemplary embodiment, the process comprises an additional operation of determining fourth data representative of a reference posture as a function of the lateral acceleration. A characteristic of the virtual graphic object 131 is then a function of a result of a comparison of the fourth data with the third data. This variable characteristic of the object Virtual Y1 131 thus corresponds to feedback that can also be provided in real time in order to correct the passenger's head posture, serving to indicate to the passenger 100 whether the inclination of his head and / or his torso is in line with the lateral acceleration that he is undergoing, that is to say with the dynamics of the vehicle 10. The variable characteristic corresponds for example to a color associated with the virtual graphic object 131. For example, the virtual graphic object 131 becomes red if the passenger 100 tilts his head and / or his torso too much or not enough. Thus, if the trajectory of the vehicle 10 is rectilinear and the passenger 100 tilts his head and / or bust, the virtual graphic object 131 changes color so as to indicate to the passenger that the tilt of his head and / or bust is not ideal; the same is true if the passenger 100 keeps his head and / or bust straight while the vehicle 10 makes a turn.

[0072] According to another particular exemplary embodiment, the second graphic content comprises another virtual graphic object 133 determined according to the result of the comparison. This other graphic object 133 makes it possible to guide the passenger 100 to correct his posture, that is to say the inclination of his head and / or his bust. The other graphic object 133 is for example presented in the form of an arrow, indicating to the passenger 100 in which direction to lean to correct his current posture and find himself in an adequate position according to the lateral or dynamic acceleration of the vehicle 10.

[0073] According to yet another particular exemplary embodiment, the process comprises an operation of determining a score or a number of points representative of the performance of the user 100 with regard to the adoption of a posture close to the reference posture during a time period comprising several time instants. Thus, during each time instant, the posture of the user 100 is compared to the reference posture determined for this time instant, a score being assigned according to the difference between these two postures for the time instant. The score is then determined as the average of the scores over the time period. This score is then represented in the form of a graphic representation 134 included in the second graphic content and displayed on the screen 13, for example in a corner of the screen 13. This score thus makes it possible to give a playful aspect encouraging the user 100 to adopt the reference posture during a journey on board vehicle 10. Optionally, new virtual environments are then accessible and configurable when the passenger score 100 reaches a threshold value.

[0074] Thus, the passenger becomes active during the journey in the vehicle. Through the second graphic content displayed on the screen in front of him, the passenger is encouraged to adopt an appropriate posture with regard to the anticipated trajectory of the vehicle. By adopting this appropriate posture, the passenger is then less prone to motion sickness, the appropriate posture making it possible to combat the centrifugal force he experiences when the vehicle takes a turn. Thanks to the second graphic content displayed on the screen, the passenger is intuitively led to anticipate the lateral and longitudinal accelerations of the vehicle through an interactive HMI.In a playful way, the passenger thus controls the attitude of a mobile object like a virtual vehicle so as to make it follow the same trajectory as the vehicle in which he is embarked, without adding specific hardware inside the vehicle, many vehicles already include screens oriented towards the passengers and interior cameras. In addition, the journey made in the vehicle seems shorter, the passenger being occupied during the journey to control the attitude of the virtual graphic object.

[0075] Figure 4 illustrates a flowchart of the different steps of a method for controlling an on-board display system in a vehicle, for example in the vehicle of Figure 1, according to a particular and non-limiting exemplary embodiment of the present invention.

[0076] The method is for example implemented by a computer on board the vehicle 10, for example by a computer of the IVI system.

[0077] In a step 41, first data representative of a radius of curvature of a portion of road 1001 on which the vehicle 10 is traveling are received. Similarly, second data representative of a speed of the vehicle 10 are received.

[0078] In a step 42, a lateral acceleration of the vehicle 10 is determined from the first and second data.

[0079] In a step 43, third data representative of a current posture of a passenger 100 of the vehicle 10 are received.

[0080] In a step 44, an orientation of a virtual graphic object 131 is determined based on the third data.

[0081] In a step 45, the display of a second graphic content on the display device 13 is controlled. The second graphic content comprises a first graphic content 132 and the virtual graphic object 131 superimposed on the first graphic content, the first graphic content being a function of the lateral acceleration of the vehicle 10.

[0082] According to a variant, the variants and examples of the operations described in relation to figures 1 to 3 apply to the steps of the method of figure 4.

[0083] Figure 5 schematically illustrates a device 5 configured to control a display system on board a vehicle, for example in the vehicle 10, according to a particular and non-limiting exemplary embodiment of the present invention. The device 5 corresponds for example to a device on board a vehicle, for example a computer.

[0084] The device 5 is for example configured for implementing the operations described with regard to figures 1 and 2 and / or the steps of the method described with regard to figure 3. Examples of such a device 5 include, but are not limited to, on-board electronic equipment such as an on-board computer of a vehicle, an electronic calculator such as an ECU (“Electronic Control Unit”), a smartphone, a tablet, a computer, a laptop, a server. The elements of the device 5, individually or in combination, can be integrated in a single integrated circuit, in several integrated circuits, and / or in discrete components. The device 5 can be produced in the form of circuits electronic or software (or computer) modules or a combination of electronic circuits and software modules.

[0085] The device 5 comprises one (or more) processor(s) 50 configured to execute instructions for carrying out the steps of the method and / or for executing the instructions of the software(s) embedded in the device 5. The processor 50 may include integrated memory, an input / output interface, and various circuits known to those skilled in the art. The device 5 further comprises at least one memory 51 corresponding for example to a volatile and / or non-volatile memory and / or comprises a memory storage device which may comprise volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic or optical disk.

[0086] The computer code of the embedded software(s) comprising the instructions to be loaded and executed by the processor is for example stored in the memory 51.

[0087] According to various particular and non-limiting embodiments, the device 5 is coupled in communication with other similar devices or systems and / or with communication devices, for example a TCU (from the English “Telematic Control Unit” or in French “Telematic Control Unit”), for example via a communication bus or through dedicated input / output ports.

[0088] According to a particular and non-limiting exemplary embodiment, the device 5 comprises a block 52 of interface elements for communicating with external devices. The interface elements of the block 52 comprise one or more of the following interfaces: - RF radio frequency interface, for example Wi-Fi® type (according to IEEE 802.11), for example in the 2.4 or 5 GHz frequency bands, or Bluetooth® type (according to IEEE 802.15.1), in the 2.4 GHz frequency band, or Sigfox type using UBN (Ultra Narrow Band) radio technology, or LoRa in the 868 MHz frequency band, LTE (Long-Term Evolution), LTE-Advanced; - USB interface (from the English “Universal Serial Bus” or “Universal Serial Bus” in French); - HDMI interface (from the English “High Definition Multimedia Interface” or “High Definition Multimedia Interface” in French); - LIN interface (from the English “Local Interconnect Network”).

[0089] According to another particular and non-limiting exemplary embodiment, the device 5 comprises a communication interface 53 which makes it possible to establish communication with other devices such as other computers of the on-board system via a communication channel 530. The communication interface 53 corresponds for example to a transmitter configured to transmit and receive information and / or data via the communication channel 530. The communication interface 53 corresponds for example to a wired network of the CAN (Controller Area Network) type, CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (standardized by the ISO 17458 standard) or Ethernet (standardized by the ISO / IEC 802-3 standard).

[0090] According to a particular and non-limiting exemplary embodiment, the device 5 can provide output signals to one or more external devices, such as a display screen 540, 14, touch-sensitive or not, one or more speakers 550 and / or other peripherals 560 (projection system) via output interfaces 54, 55 and 56 respectively. According to a variant, one or other of the external devices is integrated into the device 5.

[0091] Of course, the present invention is not limited to the exemplary embodiments described above but extends to a method for controlling an interactive visual interface to remedy motion sickness of a vehicle passenger which would include secondary steps without thereby departing from the scope of the present invention. The same would apply to a device configured for implementing such a method.

[0092] The present invention also relates to a vehicle comprising the device of Figure 5.

Claims

CLAIMS 1. Method for controlling an on-board display system in a vehicle (10), said display system comprising a display device (13), said method being implemented by at least one computer and comprising the following steps: - reception (41) of first data representative of a radius of curvature of a portion of road (1001) on which said vehicle (10) is traveling and of second data representative of a speed of said vehicle (10); - determining (42) a lateral acceleration of the vehicle (10) from the first and second data; - reception (43) of third data representative of a current posture of a passenger (100) of said vehicle (10); - determination (44) of an orientation of a virtual graphic object (131) as a function of the third data; - display control (45) of a second graphic content on said display device (13), said second graphic content comprising a first graphic content (132) and the virtual graphic object (131) superimposed on the first graphic content, said first graphic content being a function of the lateral acceleration of the vehicle (10).

2. Method according to claim 1, further comprising a step of determining fourth data representative of a reference posture as a function of the lateral acceleration, a characteristic of said virtual graphic object (131) being a function of a result of a comparison of the fourth data with the third data.

3. Method according to claim 2, for which the second graphic content comprises another virtual graphic object (133) determined according to the result of said comparison.

4. Method according to one of claims 1 to 3, for which the current posture is determined from an angle of inclination of a head and / or a bust of said passenger. determined from an image acquired by a first camera (11) on board the vehicle (10).

5. Method according to one of claims 1 to 4, for which the first data are obtained from a navigation system on board the vehicle (10).

6. Method according to one of claims 1 to 5, for which the first graphic content (132) comprises an image of said portion of road (1001) acquired by a second camera (14) on board the vehicle (10).

7. Method according to one of claims 1 to 5, for which said first graphic content (132) corresponds to a virtual environment determined by data processing comprising: - an image of said portion of road (1001) acquired by a second camera (14) on board the vehicle (10); and / or - a set of three-dimensional points associated with said portion of road (1001) acquired by a LIDAR type sensor on board the vehicle (10).

8. Computer program comprising instructions for implementing the method according to any one of the preceding claims, when these instructions are executed by a processor.

9. Device (5) for controlling an on-board display system in a vehicle, said device (5) comprising a memory (51) associated with at least one processor (50) configured for implementing the steps of the method according to any one of claims 1 to 7.

10. Vehicle comprising the device (5) according to claim 9.

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