Method and device for controlling an interactive visual interface 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 embedded in a vehicle. The method comprises receiving first data representing the radius of curvature of a section of road on which the vehicle is traveling and second data representing the vehicle's speed, and determining the vehicle's lateral acceleration from the first and second data. The method also comprises receiving third data representing a passenger's typical posture and determining the orientation of a virtual graphic object (131) based on the third data. The display of a second graphic content is then controlled on a display device (13). This second graphic content comprises a first graphic content and the virtual graphic object superimposed on the first graphic content, the first graphic content being a function of the vehicle's lateral acceleration.Figure for the abbreviation: Figure 3.

Description

Title of the invention: Method and device for controlling an interactive visual interface to remedy motion sickness in a rear passenger of a vehicle. technical field

[0001] The present invention relates to methods and devices for controlling a display system embedded in a vehicle, particularly a motor vehicle. More specifically, the present invention relates to methods and devices for controlling an interactive visual interface to alleviate motion sickness in a vehicle passenger. Technological background

[0002] The arrival 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 vulnerable.

[0003] Currently, no satisfactory solution is used in vehicles to limit 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 the light strips according to the curvature of the road, for example, pre-recorded in an on-board navigation system.

[0004] Nevertheless, although these systems may have a beneficial effect, vehicle passengers remain susceptible to motion sickness, particularly because they do not have a clear view of the upcoming stimulus and this information does not induce changes in their posture. However, if a driver is less susceptible to motion sickness than passengers, it is notably because: • Their view is unobstructed, which also explains why front passengers are less sensitive than rear passengers. • He is driving the vehicle, therefore he is 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] One object of the present invention is to resolve at least one of the drawbacks of the technological background.

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

[0007] According to a first aspect, the present invention relates to a method for controlling a display system embedded 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 initial data representing the radius of curvature of a section of road on which the vehicle is traveling and of second data representing the speed of the vehicle; - determination of a lateral acceleration of the vehicle from the first and second data points; - reception of third data representative of a common posture of a passenger in the vehicle; - determining the orientation of a virtual graphic object based on third-party data; - control of display of a second graphic content on the display device, the second graphic content comprising a first graphic content and the virtual graphic object superimposed on the first graphic content, the first graphic content being a function of the lateral acceleration of the vehicle.

[0008] Such a method encourages a vehicle passenger to adopt a specific posture depending on the road's curvature. The passenger is prompted to orient the virtual graphic object displayed on the screen according to the initial graphic content representing the curvature of the road section on which the vehicle is traveling. Just as the driver naturally does, the passenger will lean forward in the curves to properly orient the virtual graphic object. The posture adopted by the passenger is then ideal for counteracting centrifugal force in the curves and thus reducing motion sickness.

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

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

[0011] According to a further variant, the current posture is determined from an angle of inclination of a head and / or torso of the passenger determined from an image acquired by a first camera mounted in the vehicle.

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

[0013] According to yet another variant, the first graphic content includes an image of the section of road acquired by a second camera mounted in the vehicle.

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

[0015] According to a second aspect, the present invention relates to a control device for a display system embedded in a vehicle, the device comprising a memory associated with a processor configured for the implementation of the steps of the process 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 includes instructions adapted for carrying out the steps of the process 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 be in the form of source code, object code, or an 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 process 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 can include a storage means, such as a ROM, a CD-ROM or a microelectronic circuit-type ROM, or a magnetic recording means or a hard disk drive.

[0021] On the other hand, this recording medium can also be a transmissible medium such as an electrical or optical signal, such a signal being able to be transmitted via an electrical or optical cable, by conventional or radio frequency, by self-directing laser beam, or by other means. The computer program according to the present invention can, in particular, be downloaded from an Internet-type network.

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

[0023] Other features and advantages of the present invention will become apparent from the description of the particular and non-limiting embodiments of this invention. invention below, with reference to figures 1 to 4 attached, in which:

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

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

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

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

[0030] The terms "first," "second" (or "firsts," "seconds"), etc., are used in this document by arbitrary convention to allow for the identification and distinction of 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 an embodiment of the present invention, a method for controlling a display system embedded in a vehicle is, for example, implemented by a computer embedded in the vehicle.

[0032] Indeed, the method comprises receiving initial data representing the radius of curvature of a section of road on which the vehicle is traveling and second data representing the vehicle's speed. A lateral acceleration of the vehicle is then determined from the initial and second data.

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

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

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

[0036] Vehicle 10 corresponds, for example, to a vehicle with an internal combustion engine, with electric motor(s), or even a hybrid vehicle with an internal combustion engine and one or more electric motors. 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 operating in an autonomous or semi-autonomous mode. Vehicle 10 operates, for example, according to an autonomy level 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 with no autonomy, whose driving is under the total supervision of the driver, level 1 corresponding to a vehicle with a minimal level of autonomy, whose driving is under the supervision of the driver with minimal assistance from an advanced driver assistance system, and level 5 corresponding to a fully autonomous vehicle.

[0038] The 5 levels of autonomy in the classification of the federal agency responsible for road safety are: - level 0: no automation, the vehicle driver fully controls 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 driving the vehicle; cruise control is part of this level, as are other aids such as ABS (anti-lock braking system) or ESP (electronic stability program); - 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 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; however, autonomous driving can only take place under certain specific environmental and traffic conditions (only on highways for example); - level 4: fully autonomous driving under certain conditions, the vehicle is designed to independently perform all critical safety functions over a complete journey; the driver provides a destination or navigation instructions but is not required to be available to take back control of the vehicle; - Level 5: Completely autonomous driving without driver assistance in all circumstances.

[0039] The vehicle 10 is equipped with 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 during its journey.

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

[0041] According to a particular embodiment, the various computers associated with embedded systems of the vehicle 10, in particular one or more computers in charge of controlling the AD AS systems of the vehicle 10, form for example 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 embedded devices communicate and exchange data with each other via one or more computer buses, for example a communication bus of the type CAN data bus (from the English "Controller Area Network" or in French "Réseau de contrôlers"), CAN FD (from the English "Controller Area Network Flexible Data-Rate" or in French "Réseau de contrôlers à débit de données flexible"), FlexRay (according to the ISO 17458 standard) or Ethernet (according to the ISO / IEC 802-3 standard).

[0042] The road environment 1 includes, for example, a section of road 1001 on which the vehicle 10 is traveling at any given time. This section of road includes, for example, a curve characterized by a radius of curvature denoted R. It should be noted that the radius of curvature is not necessarily unique; indeed, the curve may tighten, in which case the radius of curvature decreases as one progresses through the curve, or conversely, widen, in which case the radius of curvature increases. Similarly, a curve can be defined at an intersection: if the vehicle 10 changes direction by turning, for example, right at an intersection, then this change of direction to the right is considered a right turn. However, the invention is not limited to a right turn 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 vehicle 10 can be achieved in various ways. For example, vehicle 10 may be equipped with a system for determining the position of vehicle 10 on road segment 1001, called a road positioning system. This system identifies by For example, the lane in which vehicle 10 is traveling, particularly when the road has multiple lanes, as well as the relative position of vehicle 10 within that lane. For instance, the relative position of vehicle 10 is determined with respect to a central axis of the lane, or with respect to the position of at least one lane boundary, such as one or more lines on the road, a curb, or a pavement boundary. Thus, the road positioning system is able to determine the relative position of vehicle 10 with respect to road segment 1001 and a lane, as well as the vehicle 10's future movements to remain within road segment 1001. This position and the future movements are communicated, for example, to the various ADAS (Advanced Driver Assistance Systems) computers onboard 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 comprising: • a method for recognizing lines on the ground or road signs using a camera and / or lidar; • a satellite positioning method combined with mapping; and • a simultaneous localization and mapping method, known as SLAM.

[0045] These methods make particular use of various technologies such as: - a GPS (from the English "Google Positioning System" or in French "Système mondial de emplacementage") which uses signals from satellites orbiting the Earth, the vehicle's position being determined with relatively high accuracy. However, in dense urban environments or in areas where the GPS signal is obstructed, for example, under bridges or near tall buildings, GPS may be less reliable; - a LiDAR (Light Detection and Ranging) system that uses sensors emitting 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 environment in three dimensions and determine its position based on this data. LiDAR sensors can help with precise localization, even in varied and changing environments; - a camera 14 installed on the vehicle 10, hereinafter referred to as 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 features of the environment. The second camera 14 includes in its field of vision the section of road 1001. A computer vision algorithm analyzes the images acquired by the camera 14 to recognize specific elements such as road signs, lines or markings. road surface, traffic lights, thus helping to determine the position of vehicle 10 on the section of road 1001; - one or more inertial or motion sensors, measuring acceleration, angular velocity and sometimes magnetism to track the movements of vehicle 10, capable of estimating the position of the vehicle by calculating its displacements and correlating this data with other location information; - High-definition mapping, corresponding to a detailed and precise map of the road environment of vehicle 10 in which it is located. These maps contain specific information on roads, speed limits, or intersections; the vehicle 10's road positioning system uses this map to compare what it perceives with the map data and determine the vehicle 10's position on the road.

[0046] The various location data obtained from different technologies are, for example, fused together 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 several 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, in particular the relative position of vehicle 10 with respect to the road segment 1001, as well as the future movements of vehicle 10.

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

[0048] The passenger compartment of the vehicle 10 includes one or more passenger seats 12, either individual seats or part of a bench seat. In the following description, the term "seat" refers interchangeably to a seat or part of a bench seat. A passenger 100 of the vehicle 10 is specifically seated in one of the passenger seats 12.

[0049] The passenger compartment of the vehicle 10 includes an interior camera 11, hereinafter referred to as the first camera 11. This camera 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 one or more vehicle passengers 100 in its field of vision, for example, a passenger 100 seated in a second-row seat 12. Such a camera is often installed in a passenger compartment to perform several functions, such as observing the interior of the vehicle 10 to detect the presence of occupants and / or verifying seat belt use. 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 includes an on-board display system comprising a display device 13, hereinafter referred to as screen 13, and a computer configured to control the display of content(s) of a graphic Human Machine Interface, known as HMI, on the screen 13. The computer corresponds, for example, to the computer of the infotainment system, known as the IVI computer (from the English "In-Vehicle Info-tainment" or in French "Infodivertissement parmi") of the vehicle 10. The screen 13 is, for example, touch-sensitive and corresponds, for example, to an LCD type screen (from the English "Liquid Crystal Display" or in French "Affichage à cristals liquide"), for example, of the TFT type 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 organique").The screen is arranged for example opposite 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 passenger seat 12, that is to say at the back of the back of a seat in the row preceding passenger seat 12 accommodating passenger 100, the screen 13 facing passenger 100. .

[0051] According to another particular 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 allows content to be displayed for the passenger 100 of the vehicle 10. The screen is, according to a particular 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 allows control of the infotainment system, also called the IVI system (from the English "In-Vehicle Info-tainment" or in French "Infodivertissement étoilé") of the vehicle, as well as, for example, the system in charge of controlling the display system embedded in the vehicle 10.

[0053] A control process for the vehicle's on-board display system 10 is implemented, for example, 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 representing a radius of curvature of the portion of road 1001 on which the vehicle 10 travels are received as well as second data representing a speed of the vehicle 10.

[0055] According to a particular embodiment, the first and second data points are obtained from a navigation system embedded in the vehicle 10. Indeed, such a system has both the radii of curvature obtained via mapping, for example, and the current speed of the vehicle 10 determined, for example, from Its latest geographical positions are determined by the navigation system. The radius of curvature R of road segment 1001, for example, is obtained from the mapping data. Road segment 1001 is determined in advance by combining the GPS system and an ADASIS® system (Advanced Driver Assistance Systems Interface Specification). This system provides real-time information on the most probable route, the vehicle's position, alternative routes, and road profiles, including the radius of curvature of road segment 1001, the maximum speed limit, and intersection information. The GPS and ADASIS® systems are interfaced with the communication bus described earlier.

[0056] According to another particular embodiment, the first data are obtained from the vehicle positioning system 10, for example from a LiDAR® or from image processing 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 that applies to a passenger 100 of the vehicle 10 when the vehicle 10 is turning, the turn being due to the radius of curvature R of the road segment 1001 and the centrifugal force being greater the higher the speed of the vehicle 10 in the turn.

[0058] According to a particular embodiment, data representative of a steering angle are also received, allowing the accuracy of the estimation of the behavior of vehicle 10 to be improved, in particular the lateral acceleration of vehicle 10.

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

[0060] According to a particular 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 torso of the passenger 100 determined from an image acquired by a first camera 11 mounted in the vehicle 10. The angle of inclination a of the head and / or torso is, for example, measured between a principal axis AiOo of the head of the passenger 100 with respect to a vertical axis V10, the vertical axis V10 being defined in the frame of reference 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 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 (in English "Machine Learning") available in Python® using Mediapipe®, which allows the passenger's posture to be identified via joint markers and the head and torso tilt angles to be defined. These head tilt angles are then transmitted, for example, via a UDP (User Datagram Protocol) link to the computer responsible for controlling the vehicle's onboard display system.

[0062] According to another particular embodiment, the camera is of the "Time of Flight" or TOF type.

[0063] In a fourth operation, an orientation of a virtual graphic object 131 is determined as a function of the third data.

[0064] In order to make passenger 100 active in their posture, or in other words to generate agency, the posture of passenger 100 is associated with an orientation corresponding to the attitude of a virtual graphic object that will be projected onto the screen 13. Passenger 100 thus controls the attitude of the virtual graphic object 131 by tilting their head and / or torso. The attitude corresponds in particular to the angle of inclination [3] between a vertical axis Vj3 of the screen 13 and a principal axis Am 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 spacecraft, which tilts to take a turn. Such a virtual graphic object is, for example, represented in [Fig. 3], which schematically illustrates a display device embedded in a vehicle, for example in the vehicle of [Fig. 1], according to a particular and non-limiting 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 travels, 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 turn he will follow from the vehicle 10 and therefore of the lateral acceleration he will undergo.

[0068] According to a first particular embodiment, the first graphic content 132 comprises an image of the road segment 1001 acquired by the second camera 14 mounted in the vehicle 10. Using information that allows for a continuously updated anticipation of the future trajectory of the vehicle 10 on the segment of route 1001 such as the radius of curvature R of the road segment 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 segment 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 from the second camera 14, the modified video stream then being broadcast on the screen 13 of the display system for the 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 segment 1001 acquired by the second camera 14 mounted in the vehicle 10 and / or by processing data representative of the topology of the road segment 1001 acquired by an on-board 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 segment 1001 and its radius of curvature R as 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 easier to understand and has an entertaining character.The light tunnel, for example, is composed of a set of gates or ovoid-shaped graphic objects arranged along a curve 132a corresponding to the anticipated trajectory of vehicle 10.

[0070] Thus, by actively tilting their head and / or torso towards the upcoming curve, as the driver does, the passenger controls the attitude of the virtual graphic object 131 displayed on the screen 13, and simultaneously adjusts their body position along the upcoming trajectory. The passenger's head and / or torso 100 is then tilted so as to align with the gravito-inertial force they experience, that is, with the resultant force of the vertical gravitational force and the horizontal centrifugal force generated when turning. The passenger is thus actively controlling their own movement, which is performed voluntarily, thereby limiting the symptoms of motion sickness.

[0071] According to a particular embodiment, the process includes an additional operation of determining fourth data points representing a reference posture as a function of lateral acceleration. A characteristic of the virtual graphic object 131 is then a function of the result of a comparison of the fourth data points with the third data points. This variable characteristic of the virtual object 131 thus corresponds to feedback that can also be provided in real time to correct the passenger's head posture, serving to The system indicates to passenger 100 whether the tilt of their head and / or torso is appropriate for the lateral acceleration they are experiencing, i.e., for the dynamics of vehicle 10. The variable characteristic corresponds, for example, to a color associated with the virtual graphic object 131. For instance, the virtual graphic object 131 turns red if passenger 100 tilts their head and / or torso too much or too little. Thus, if the trajectory of vehicle 10 is straight and passenger 100 tilts their head and / or torso, the virtual graphic object 131 changes color to indicate to the passenger that their head and / or torso tilt is not ideal. The same occurs if passenger 100 keeps their head and / or torso upright while vehicle 10 is turning.

[0072] According to another particular embodiment, the second graphic content includes another virtual graphic object 133 determined based on the result of the comparison. This other graphic object 133 guides the passenger 100 to correct their posture, i.e., the inclination of their head and / or torso. The other graphic object 133 is, for example, presented as an arrow, indicating to the passenger 100 in which direction to lean in order to correct their current posture and find themselves in a suitable position depending on the lateral or dynamic acceleration of the vehicle 10.

[0073] According to yet another particular embodiment, the process includes an operation for determining a score or a number of points representative of the performance of user 100 in adopting a posture close to the reference posture during a time period comprising several time intervals. Thus, during each time interval, the posture of user 100 is compared to the reference posture determined for that time interval, a score being assigned based on the difference between these two postures for that time interval. The score is then determined as the average of the scores over the time period. This score is then represented as a graphical representation 134 included in the second graphical content and displayed on the screen 13, for example in a corner of the screen 13.This score thus provides a playful aspect, encouraging the user (100) to adopt the reference posture during a journey on board the vehicle (10). Optionally, new virtual environments are then accessible and configurable when the passenger's score (100) reaches a threshold value.

[0074] Thus, the passenger becomes active during the journey in the vehicle. Through the second graphic display on the screen in front of them, the passenger is encouraged to adopt a posture appropriate to the anticipated trajectory of the vehicle. By adopting this appropriate posture, the passenger is less prone to motion sickness, as the correct posture helps to counteract the centrifugal force experienced when the vehicle takes a turn. Thanks to the second graphic display on the screen, the passenger is intuitively led to anticipate lateral and longitudinal accelerations. Vehicle navigation is controlled through an interactive user interface. In a playful way, the passenger controls the attitude of a moving object, such as a virtual vehicle, to make it follow the same trajectory as the vehicle they are in. This requires no additional hardware inside the vehicle, as many vehicles already include passenger-facing screens and interior cameras. Furthermore, the journey seems shorter, as the passenger is occupied during the trip controlling the attitude of the virtual graphic object.

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

[0076] The process is implemented for example by a computer embedded in the vehicle 10, for example by a computer of the IVI system.

[0077] In a step 41, first data representing the radius of curvature of a section of road 1001 on which the vehicle 10 is traveling are received. Similarly, second data representing the 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 common 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 according to 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 one variant, the variants and examples of the operations described in relation to Figures 1 to 3 apply to the steps of the process in [Fig.4].

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

[0084] Device 5 is, for example, configured to carry out the operations described opposite Figures 1 and 2 and / or the steps of the process described opposite [Fig. 3]. Examples of such a device 5 include, but are not limited to, embedded electronic equipment such as a vehicle's on-board computer, a cal An electronic device such as an ECU (Electronic Control Unit), a smartphone, a tablet, a computer, a laptop, or a server. The elements of device 5, individually or in combination, can be integrated into a single integrated circuit, into several integrated circuits, and / or into discrete components. Device 5 can be implemented as electronic circuits, 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 process and / or for executing instructions from the software 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, for example, volatile and / or non-volatile memory, and / or includes a memory storage device that may include volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic disk, or optical disk.

[0086] The computer code of the embedded software(s) including the instructions to be loaded and executed by the processor is for example stored on 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 (Telematic Control Unit), for example via a communication bus or through dedicated input / output ports.

[0088] According to a particular and non-limiting embodiment, the device 5 includes a block 52 of interface elements for communicating with external devices. The interface elements of the block 52 include one or more of the following interfaces: - radio frequency RF interface, for example of the Wi-Fi® type (according to IEEE 802.11), for example in the 2.4 or 5 GHz frequency bands, or of the Bluetooth® type (according to IEEE 802.15.1), in the 2.4 GHz frequency band, or of the 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", or in French "Réseau interconnecté local").

[0089] According to another particular and non-limiting embodiment, the device 5 includes a communication interface 53 which allows communication to be established with other devices such as other computers of the embedded 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 ISO 17458) or Ethernet (standardized by ISO / IEC 802-3).

[0090] According to a particular and non-limiting embodiment, the device 5 can provide output signals to one or more external devices, such as a display screen 540, 14, touch or non-touch, 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 more of the external devices is integrated into the device 5.

[0091] Of course, the present invention is not limited to the embodiments described above but extends to a method for controlling an interactive visual interface to alleviate motion sickness in a vehicle passenger, which would include secondary steps without falling outside 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 [Fig.5].

Claims

Demands

1. A method for controlling a display system embedded 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: - receiving (41) first data representing a radius of curvature of a portion of road (1001) on which said vehicle (10) is traveling and second data representing a speed of said vehicle (10); - determining (42) a lateral acceleration of the vehicle (10) from the first and second data; - receiving (43) third data representing a typical posture of a passenger (100) of said vehicle (10); - determining (44) 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. A method according to claim 1, further comprising a step of determining fourth data representing a reference posture as a function of 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. A method according to claim 2, wherein the second graphic content comprises another virtual graphic object (133) determined according to the result of said comparison.

4. A method according to any one of claims 1 to 3, wherein the current posture is determined from an angle of inclination of a head and / or torso of said passenger determined from an image acquired by a first camera (11) mounted in the vehicle (10).

5. A method according to any one of claims 1 to 4, wherein the first data are obtained from a navigation system embedded in the vehicle (10).

6. A method according to any one of claims 1 to 5, wherein the first graphic content (132) includes an image of said section of road (1001) acquired by a second camera (14) mounted in the vehicle (10).

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

8. A computer program comprising instructions for carrying out the method according to any one of the preceding claims, when such instructions are executed by a processor.

9. Device (5) for controlling a display system embedded in a vehicle, said device (5) comprising a memory (51) associated with at least one processor (50) configured for carrying out 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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