FR3077635A1 - DISPLAY SYSTEM FOR A VEHICLE AND DISPLAY METHOD THEREOF - Google Patents

Abstract

The invention relates to a display system (10) for a vehicle (1), the display system comprising: - a display (11) configured to display elements in such a way that they are visually superimposed, for a user (2) of said system, to an environment (E) of the display system, - a wireless data receiving device (13), and - a control unit (14) programmed to: - receive, via the receiving device, data relating to a position of the environment (PL), and for controlling the display to display a visually superimposed element in the environment of the display system at a position of displaying (P'A) function of said received data. The invention also relates to an associated display method.

Description

Display system for a vehicle and associated display method

Technical field to which the invention relates

The present invention relates generally to the field of display systems for motor vehicles.

It relates in particular to such a display system further comprising a location device by GPS signals (according to the English acronym for "Global Positioning System", or global positioning system).

It is particularly useful in helping to locate a passenger to be taken care of.

TECHNOLOGICAL BACKGROUND

Many drivers of motor vehicles, in particular taxi drivers or private drivers of passenger cars, today use applications to help locate passengers to be taken care of, run by a mobile phone (or cell phone ) of the driver.

When such an application is executed, the mobile telephone receives data indicating a position where a passenger is picked up, and displays on the telephone screen a route to be followed in order to reach this position.

This route is determined by a GPS type navigation system installed in the telephone, which includes a device for locating the telephone by GPS signals, and map data describing the network of traffic lanes on which the vehicle is traveling.

Such a system helps the driver to approach the take-over position, where the passenger wishing to board the vehicle is located.

However, once in the vicinity of this position, it may prove difficult for the driver to locate this passenger in the environment of the vehicle, in particular at night, or in an urban environment because the environment of the vehicle is then very complex. and may even include several pedestrians of which only one is the passenger to be taken care of (or only some of which are the passengers to be taken care of).

Object of the invention

In this context, the present invention provides a display system for a vehicle, the display system comprising:

- a display configured to display elements so that they are visually superimposed, for a user of said system, on an environment of the display system,

- a device for receiving data by wireless link, and

- a control unit programmed for:

- receive, via the reception device, data relating to a position of the environment, and for

- command the display to display an element that is visually superimposed, in the environment of the display system, at a display position as a function of said received data.

Display this element "in augmented reality", that is to say so that it is visually superimposed, in the environment of the display system, at a given position (in this case said position d 'display), allows this user to directly indicate the said position of the environment, received by the display system (for example a position where there is a passenger to be taken care of), without this user having to look away from this environment for this (it would not be the same if the user had for example to look at the screen of his mobile phone to locate the position of support for this passenger).

In addition, displaying this element directly in the aforementioned environment makes it possible to bring out this position of the environment, in relation to the rest of the environment. This allows in particular a driver of the vehicle to more easily identify a passenger to be taken care of in this generally complex environment.

Other non-limiting and advantageous characteristics of the display system according to the invention, taken individually or in any technically possible combination, are the following:

- the display system includes a device for locating the display system;

- the control unit is programmed to determine said display position as a function of said received data and of data representative of a position of the display system determined by its location device;

- The control unit is programmed to determine said display position further depending on an orientation of the display system determined by its location device;

the display position is defined relative to the display system, and the control unit is programmed to determine the display position so that it coincides, in the environment of the display system, with said position of the environment;

the display system further comprises a pedestrian detector adapted to detect one or more pedestrians present in a detection field of the pedestrian detector, and to determine, for each detected pedestrian, a position of this pedestrian relative to the system d 'display;

- the control unit is also programmed to, in the event of detection of one or more pedestrians by the detection device, determine the display position as a function of at least one of the positions of the determined detected pedestrian or pedestrians by the pedestrian detector;

- the control unit is also programmed for, if one or more pedestrians are detected by the detection device,

- determine, on the basis of the position of the display system, a distance separating said position of the environment from the position of at least one of the pedestrians detected, and

- when said distance is less than a predetermined threshold, determine the display position so that it coincides with the position of said pedestrian, determined by the pedestrian detector;

- the control unit is also programmed for, when the pedestrian detector detects several pedestrians:

- select, on the basis of:

- positions of detected pedestrians determined by the pedestrian detector,

- the position of the display system, and

- of said position of the environment, that of said pedestrians which is closest to said position of the environment, and for

- determine the display position so that it coincides with the position of the previously selected pedestrian;

- the display system comprises a device for transmitting data by wireless link, and, said display position being defined relative to the display system, the control unit is programmed for:

- transmit to a remote data processing service, by means of the transmission device, data representative of a position of the display system determined by the location device,

- receive in response, from said remote data processing service, said data relating to the position of the environment, this data being representative of the display position P’a itself.

The invention also provides a display method implemented by a display system for a vehicle, comprising the following steps:

reception, via a data reception device by wireless link of the display system, of data relating to a position of an environment of the display system, and

- display, by a display of the display system, of an element visually superimposed, in said environment, on a display position as a function of said received data.

Other non-limiting and advantageous characteristics of the display method according to the invention, taken individually or in any technically possible combination, are the following:

- The method further comprises a step of determining, by a location device fitted to the display system, a position of the display system;

the method further comprises a step of determining said display position, as a function of said position of the environment and of said position of the display system;

- the display position is a relative position defined in a coordinate system linked to the display system, and it is determined so as to coincide with said position of the environment;

the method further comprises steps of:

- detection of one or more pedestrians present in a detection field of a pedestrian detector fitted to the display system, or, on the contrary, of an absence of pedestrians in this detection field, and

- in the event of detection of one or more pedestrians present in the detection field, determination, for each pedestrian detected, of a position of this pedestrian relative to the display system;

- the display position is determined as a function of at least one of the positions of the detected pedestrian (s) determined by the pedestrian detector;

the method further comprises a step of determining, on the basis of the position of the display system, of a distance separating said position of the environment from the position of at least one of the detected pedestrians;

- The method further comprises a step of determining the display position so that it coincides with the position of said pedestrian determined by the pedestrian detector, when said distance is less than a predetermined threshold;

- the method further comprises a step of selecting which of said pedestrians is closest to said position of the environment, when the pedestrian detector detects several pedestrians, on the basis:

- positions of detected pedestrians determined by the pedestrian detector,

- the position of the display system, and

- of said position of the environment;

- the display position is determined so as to coincide with the position of the previously selected pedestrian;

- The method further comprises a step of determining, by a location system fitted to a portable communication device, said position of the environment, said position of the environment locating this portable communication device in the environment;

- The method further comprises a step of transmitting said data relating to said position of the environment, by the portable communication device;

- the display position is determined by a control unit of the display system;

the method further comprises steps of:

- reception, by a localized data processing service, of data representative of said position of the environment,

- determination, by a localization device fitted to the display system, of a position of the display system,

- transmission to the localized data processing service, by means of a display system transmission device, of data representative of said position of the display system,

- determination of said display position by the remote data processing system, as a function of the data representative of said position of the environment, and of the data representative of said position of the display system

- transmission of said data processing service to the display system of said data relating to the position of the environment, in the form of data representative of said display position determined previously by the processing processing service .

Detailed description of an exemplary embodiment

The description which follows with reference to the appended drawings, given by way of nonlimiting examples, will make it clear what the invention consists of and how it can be carried out.

In the accompanying drawings:

FIG. 1 schematically represents a motor vehicle equipped with a display system, and its environment, seen from above,

FIG. 2 schematically represents this environment, as seen by a user of the display system,

FIG. 3 schematically represents the main steps of a display method according to a first embodiment, implemented by the display system of FIG. 1, and

- Figure 4 schematically shows the main steps of a display method according to a second embodiment.

This display system 10 represented in FIG. 1 comprises a display 11 for augmented reality, that is to say configured to display elements so that they overlap visually, for a user 2 of the system d display 10, to an environment E of this system.

The user 2 of the display system 10 is here a driver of a motor vehicle 1 such as a car or a motorcycle, and the environment of the display system therefore corresponds to an environment of this vehicle.

The elements displayed by the display 11 may include information relating to the state of the traffic around the vehicle, or be intended to underline or materialize elements of the environment E of the vehicle such as a lane border 6 or an intersection located in front of the vehicle 1.

The display 11 is capable, more precisely, of displaying such an element so that it is superimposed, in the field of vision of the user 2, at a given position of the environment E. From the point of view of the user, the element thus appears as being located, in environment E, at said position.

The set of environmental positions, to which the display 11 can superimpose such an element, is the display field Fv of the display 11. This display field here extends in front of the vehicle 1.

In this embodiment, the display system 10 is installed in the motor vehicle 1, and the display 11 is produced by means of a head-up display.

This head-up display uses a partial reflection on the windshield 5 of the vehicle (or on a partially transparent element located between the eyes of the driver 2 and the windshield 5) to project an image comprising the elements to be displayed so that this image is visually superimposed on the environment E of vehicle 1.

Alternatively, the display could however be produced by means of a helmet or glasses for augmented reality, configured to display said elements on screens, spectacle lenses, or a helmet visor placed just in front of the driver's eyes. .

Within the framework of this variant, it is possible to provide that the display system, produced in the form of these headphones or these glasses for augmented reality, be worn by the driver instead of being permanently installed in the vehicle.

The display system 10 also comprises a location device 12 (of the display system) by GPS and / or GSM signals (according to the acronym for "Global System for Mobile Communications"), or by another type signals for geolocation (such as signals from satellites of the future Galileo location system, for example), or is connected to such a location device installed in the vehicle.

The location device 12 makes it possible to determine a position of the display system Ps, with respect to its environment E. This position is defined in a fixed reference frame R, linked to the environment E of the display system, such as the reference frame earthly. The location device 12 is able to determine coordinates Cs identifying the position of the display system Ps in this fixed reference frame R. These coordinates Cs correspond for example to the latitude, the longitude, and possibly the altitude of the display device 10.

The location device 12 is also able to determine an orientation of the display system with respect to its environment E, for example by means of an electronic compass.

The display system 10 also includes a wireless communication module 13, for example via the GSM telecommunications network. The communication module 13 here comprises a reception device and a transmission device.

The display system 10 also includes a pedestrian detector 15, or is connected to such a detector installed in the vehicle 1.

The pedestrian detector 15 is capable of detecting one or more pedestrians U1, U2 present in its detection field Fd (the detection field of the detector is formed by all of the positions of the environment where the presence of a pedestrian can be detected by the detector).

The pedestrian detector 15 is also able to determine, for each pedestrian U1, U2 detected, a position ΡΊ, P'2 of this pedestrian relative to the display system 10. The position or positions thus determined are relative positions, defined in a mobile repository R ', linked to the display system 10.

The pedestrian detector 15 is produced here by means of:

- a camera, arranged so that its field of vision extends in front of vehicle 1, and

a processing unit for the images captured by this camera, this processing unit being for example integrated into an electronic control unit 14 which will be described below.

The detection field Fd is then formed by at least part of the field of vision of this camera, and therefore extends here in front of the vehicle 1 (FIG. 1).

As a variant, or in addition, the pedestrian detector could include a sonar, or a lidar (according to the acronym “Light Detection and Ranging”, that is to say detection and measurement of distance by a light beam).

By way of illustration, the motor vehicle 1 is represented in FIG. 1 in a situation for which it is located on a traffic lane 3, bordered on the right by a sidewalk 4 on which there is a first pedestrian U1 and a second pedestrian U2, a few meters from each other. In this situation, the first and second pedestrians U1 and U2 are located in the detection field F _D of the pedestrian detector 15. They are also located in the display field F _v of the display 11.

The electronic control unit 14 of the display system 10 comprises at least one microprocessor and a memory. It is connected to the communication module 13, and can therefore, via the wireless link mentioned above, exchange data with devices located remote from the display system (and therefore remote from the vehicle 1).

The control unit 14 is also connected to the pedestrian detector 15.

Remarkably, the control unit 14 is programmed to:

- receive, via the receiving device (from the communication module 13), data relating to a position of the environment P _L , and for

- order on the display 11 to display an element that is visually superimposed, in the environment E of the display system, at a display position P ’as a function of said received data.

This arrangement makes it possible in particular, thanks to said element displayed in “augmented reality”, to bring out said position of the environment P _L , received by the display system 10, with respect to the rest of this environment E.

This element can for example comprise a luminous symbol such as a cross, a disc, a circle, or a symbol in the shape of a pedestrian, possibly flashing, centered on the display position P'a The position of the environment Pl is defined in the fixed reference frame R mentioned above. The data received by the display system 10, relating to this position of the environment Pl, can include coordinate values Cl identifying this position in the fixed reference frame R, for example values of latitude, longitude, and possibly d 'altitude.

As for the display position P'a, it is defined with respect to the display system 10. Otherwise formulated, it is a relative position, defined in a reference linked to the display system 10 such as the mobile repository R 'presented above. The display position P ' _A is identified here in the mobile reference frame R', by its coordinates C'a.

In the embodiment described here, the control unit 14 is programmed to, at least in certain circumstances (detailed below), determine the display position P ' _A so that it coincides, for said position of the display system Ps, with the position of the environment Pl. The display position P ' _A is then obtained for example by a calculation of change of reference frame of said position of the environment P _L , from the fixed reference frame R, to the mobile reference frame R '.

The displayed element is then visually superimposed on the position of the environment Pl received by the display system, whatever the position (and the orientation) of the display system 10 relative to its environment E.

To determine the display position P ' _A , the control unit 14 can be programmed to:

- determine coordinates C'l identifying said position of the environment Pl in the mobile reference frame R '(linked to the display system), as a function of the coordinates Cl identifying this position P _L in the fixed reference frame R (received by the system display 10), coordinates Cs identifying the position of the display system Ps in this same fixed reference frame R (determined by the localization device 12), and as a function of the orientation of the display system 10 in this reference frame fixed, and for

- assign the coordinates C'l thus determined to the display position P'a (the coordinates C'a of the display position P'a, expressed in the mobile reference frame R 'are then equal to the coordinates C'l determined by the change of repository indicated above).

In the embodiment described here, the control unit 14 is programmed to determine the display position P'a as a function of the position of the environment Pl, received via the communication module 13, but also, in the event detection of a pedestrian, depending on the position of the detected pedestrian.

More specifically, the control unit 14 is programmed here to implement steps E1 to E4 of a first embodiment of a display method according to the invention, shown diagrammatically in FIG. 3.

This process begins with the following steps E01 and E02, implemented by a portable communication device 20:

E01- determination, by a localization system equipping the portable communication device 20, of said position of the environment P1, said position of the environment locating this portable communication device 20 in the environment E, then

E02- transmission of said data relating to the position of the environment Pl, by the portable communication device 20.

In step E02, the portable communication device 20 also sends a request indicating that one or more pedestrians, located at said position of the environment P1, wish to be supported in a vehicle for making a journey. The position of the environment Pl is therefore a position for taking charge of this or these pedestrians.

In the situation represented in FIG. 1, the portable communication device 20 is a portable telephone (cellular telephone) with which the first pedestrian U1 is provided, this pedestrian having entered a care request by means of an interface of this telephone. portable.

In the following step E1, the control unit 14 of the display system 10 receives said data relating to the position of the environment Pl, and the request for taking charge of the pedestrian, via the communication module 13.

The method then continues with a step E2, of determining the position of the display system P _s , and of its orientation relative to the environment E, by the localization device 12 equipping the display system 10.

During the following test step, T1, the control unit 14 determines, as a function of said position of the environment Pl, of the position of the display system Ps, and of its orientation, if the position of the environment Pl is located in the display field Fv of the display 11, or on the contrary outside of it.

When the position of the environment P1 is situated outside the display field F _v , the process resumes at step E2 (arrow F2 in FIG. 3). Optionally, the control unit 14 then transmits the position of the environment P1, received by the display system 10, to a navigation system (not shown), and commands this navigation system to display a route leading from the position of the display system P _s , to said position of the environment P _L (step E10 of FIG. 3; the navigation system comprises for example a display screen, cartographic data representative of a road network on which the vehicle travels, and a device for localization by GPS signals).

On the contrary, when the position of the environment P _L is located in the display field Fv, the method continues with a step E20 (arrow F1 in FIG. 3), during which the pedestrian detector 15 detects:

- one or more pedestrians U1, U2 present in its detection field F _d , or, on the contrary,

- an absence of pedestrians in this detection field.

In the presence of one or more pedestrians, the pedestrian detector 15 also determines, for each detected pedestrian, the position ΡΊ, P'2 of this pedestrian relative to the display system 10. Thus, the pedestrian detector 15 determines , for each pedestrian U1, U2 detected, coordinates C'1, C'2 identifying the position ΡΊ, P'2 of this pedestrian in the mobile reference frame R 'linked to the display system 10.

The process then continues with a step E3, of determining the display position P ' _A.

When the pedestrian detector 15 has detected, in step E20, an absence of pedestrians in its detection field, step E3 begins with a step E30 (arrow F4 in FIG. 3). In step E30, the control unit 14 determines the display position P ' _{A of} said element so that it coincides with said position of the environment P _L , received by the display system 10.

On the contrary, when the pedestrian detector 15 has detected, in step E20, one or more pedestrians U1, U2 present in its detection field Fd, step E3 begins with a step E31 of comparison, for each pedestrian U1, U2 detected, from:

- the position ΡΊ, P’2 of the pedestrian determined by the pedestrian detector 15, with

said position of the environment P _L received via the communication module 13.

To compare these different positions, the control unit 14 determines coordinates identifying, in the same common reference frame, the positions of pedestrians ΡΊ, P’2 detected and said position of the environment Pl, then compares these different coordinates with each other.

This common reference here is the fixed reference R (fixed relative to the environment E). Step E31 then comprises a determination, as a function of the position of the display system Ps and of its orientation, for each pedestrian U1, U2 detected, with coordinates C1, C2 identifying the position of this pedestrian in the fixed reference frame R.

As a variant, the common reference frame, in which the positions to be compared are expressed, could be the mobile reference frame R ’(linked to the display system 10), or another reference frame.

The comparison between the positions ΡΊ, P'2 of the pedestrians U1, U2 detected, and the position of the environment Pl received by the display system here comprises, for each pedestrian U1, U2 detected, a determination of a distance d1 , d2 separating this pedestrian from said position of the environment Pl. This distance d1, d2 is calculated as a function of the coordinates C1, C2, Cl, locating, in the aforementioned common reference frame, the position of the pedestrian ΡΊ, P'2 considered and said position of the environment Pl.

Step E31 is followed by a step E32 of selecting, among the pedestrians U1, U2 detected in step E20, that of said pedestrians U1 which is closest to said position of the environment P1 (that is to say - say the one for which the distance determined in step E31 is the smallest).

If only one pedestrian has been detected, in step E20, this pedestrian is selected, in step E32.

As a variant, the steps E31 and E32 of comparing positions, and of selecting one of the detected pedestrians, could be carried out differently, for example by a calculation of correspondence between:

the positions of the pedestrians detected, in an image captured by the camera of the pedestrian detector 15, and

a position corresponding, in this image, to said position of the environment Pl.

As a variant or in addition, the selection step E32 could include a comparison between respective amplitudes of movement of the different pedestrians U1, U2 detected. In this case, the control unit can, for example, select the pedestrian with the smallest range of motion (that is, the one who is most immobile with respect to environment E).

The amplitudes of movement of the different detected pedestrians can be determined by image analysis and / or from data received from the communication devices carried respectively by each of these pedestrians (this data can be determined by motion sensors, such as accelerometers, equipping these devices). It could also be provided that the control unit selects one of the detected pedestrians by taking into account both its distance from the position of the environment Pl, and its range of motion.

When the pedestrian detector 15 comprises several sensors, for example when it comprises the aforementioned camera and a radar, lidar or sonar, the steps E31 and E32 of comparison and selection can take account of the data from these different sensors (for example via a fusion of these data, or via an estimation of the positions of pedestrians taking into account the data provided by all of these sensors).

In the situation shown by way of example in FIG. 1, the pedestrian closest to the position of the environment P1 is the first pedestrian U1 (which, in this case, is the one which issued the request to take over load, and the data relating to said position of the environment Pl).

During the next test step, T2, the control unit 14 determines:

- if the pedestrian detected, then selected in step E32, is the carrier of the portable communication device 20 having sent said data relating to the position of the environment P1 (and said request for support), or, on the contrary ,

- if this pedestrian is not the carrier of the portable communication device 20 in question.

For this, the control unit 14 determines for example if the distance separating:

the position of the selected pedestrian (in this case, in the situation represented in FIG. 1, it is the first pedestrian U1, and therefore of the distance d1),

- Said position of the environment Pl, is less than a predetermined threshold ds, in which case the control unit determines that the detected (and selected) pedestrian is the carrier of the portable communication device 20 (and is therefore the passenger to be picked up loaded in the vehicle 1).

The threshold ds is for example less than 5 meters.

The threshold ds can be adjusted as a function of a precision with which said position of the environment P _{L is known} . This accuracy depends on the performance of the location system of the portable communication device 20 (of the GPS type for example), and on the context in which the wearer of this device is located (this context influencing the quality and reliability of reception of traffic signals. GPS or GSM type, for example). A value representative of the precision with which the position of the environment P _{L is known} can be supplied to the display system by the mobile telephone of the pedestrian wishing to embark (via said wireless link). The threshold ds is then adjusted so as to be all the smaller the higher this precision.

As a variant, other tests can be envisaged to determine whether the pedestrian, detected and then selected in step E32, is at the origin of the emission of said datum (relating to the position of the environment P1), and of the takeover request. For example, this test could consist in determining whether said position of the environment Pl is located in the detection field F _D of the pedestrian detector 15, in which case the control unit determines that the detected pedestrian (and then selected) is probably the person who issued the takeover request.

As a variant or in addition, the test in step T2 could take account of the amplitude of movement of the pedestrian U1 selected in step E32, and determine that this pedestrian is probably the one who issued the care request provided furthermore that its range of motion is less than a given threshold.

When step T2 shows that the detected and then selected pedestrian is not the carrier of the portable communication device 20 having sent said data relating to the position of the environment P1, the method continues with step E30, which has been described above (arrow F6 in FIG. 3).

When step T2 shows, on the contrary, that the detected and then selected pedestrian is the carrier of the portable communication device 20 having sent said data relating to the position of the environment P1, the method continues with a step E33 (arrow F5 in Figure 3).

In step E33, the control unit 14 determines the display position P'a so that it coincides with the position P'-i of the pedestrian U1 which has been detected (in step E20) and then selected (in step E32). The coordinates C’a and C’1 which respectively identify the display position P’a and the position ΡΊ of the pedestrian U1 detected (and selected) in the mobile reference frame R ’are then equal.

Determining the display position P'a as a function of the position ΡΊ of the pedestrian U1 which has been selected, as is done in step E33, generally leads to a visual superposition of the element displayed, on the pedestrian who has initially sent said data relating to the position of the environment Pl, more precise than a determination of the display position P'a such as that carried out in step E30.

Indeed, the precision with which the pedestrian detector 15 determines the position ΡΊ of this pedestrian U1 is generally greater than the precision with which the location system (of the GPS type) of the mobile telephone with which this pedestrian is provided determines said position of the 'environment Pl.

This also allows the displayed element to be superimposed visually on this pedestrian (U1), even if the latter moves between the emission of said datum relating to the position of the environment Pl, and the arrival of vehicle 1 at neighborhood of this position.

Determining the display position on the basis of the position of the detected and then selected pedestrian is therefore particularly interesting in terms of display accuracy. However, it should be checked beforehand that this pedestrian is the one who sent said data relating to the position of the environment P1 (which is done here in step T2), in particular to avoid superimposing the element to be displayed on any pedestrian that would have been detected, even though this pedestrian would be very far from the support position (Pl) received by the display system.

As for steps E31 and E32, they prove to be particularly useful in an urban environment, when many pedestrians are present in the environment E of the display system 10, since they make it possible to select from among the detected pedestrians the one who has the most of chances of being the pedestrian at the origin of the emission of the request for assumption of responsibility mentioned above.

Once the display position P'a has been determined, either in step E30 (for example when no pedestrian is detected), or in step E33 (when a pedestrian is detected and that it is close to said position of the environment P _L ), the method continues with a display step E4 (arrows F7 and F8 in FIG. 3).

In step E4, the display 11 displays said element so that it is visually superimposed, in said environment E, at the display position P ' _A.

For this, the control unit 14 controls the display as a function of the display position P'a, and, optionally, as a function of a position of the user's head relative to the display. .

Optionally, it is possible to provide that a dimension of the element to be displayed (if this element is a circle, the diameter of this circle, for example) is determined, in step E4, as a function of a precision, or of a reliability level with which the display position P'a has been determined. The dimension of the element to be displayed is then all the greater when the accuracy of determining the display position P'a is low, to visually indicate to user 2 in which zone it is likely that the pedestrian to take charge.

The accuracy of determining the display position P'a can be determined for example as a function of an accuracy of determining the position of the display system P _s , the value of which is supplied by the location device 12 of the system display, and / or as a function of the precision with which said position of the environment P1 is known (the value of this precision being supplied to the display system by the mobile telephone of the pedestrian wishing to embark, via said link without wire).

After step E4, the process resumes here in step E2 (arrow F9 in FIG. 3). All of the steps from E2 to E4 are thus executed several times successively (for example until the user of the display system orders the process to be stopped). This makes it possible to regularly update the position of the display system Ps relative to its environment E, and to recalculate the display position P’a for each new position of the display system. From a visual point of view, for the user 2 of the display system 10, the displayed element then remains superimposed on said position of the environment, or on the selected pedestrian, even when the vehicle is moving.

By way of illustration, FIG. 2 schematically represents the environment E of the display device 10, as seen by the user 2, when the vehicle 1 is in the situation shown in FIG. 1.

The first and second pedestrians U1 and U2 are then present in the field of vision of the user 2. Furthermore, in this situation, it is recalled that:

said position of the environment Pl is located in the display field F _v of the display 11,

the first and second pedestrians U1 and U2 are located in the detection field Fd of the pedestrian detector 15,

- The first pedestrian U1 is the one that is closest to said position of the environment Pl.

Furthermore, the distance d1 separating the position ΡΊ of the first pedestrian U1 (as determined by the pedestrian detector) from said position of the environment Pl is less than the threshold ds.

In this situation, it is therefore the following steps of the method (described above) which are executed: E2, then T1, then E20, then E31, E32, T2, then E33, and finally E4.

In step E4, the element to be displayed, in this case a circle 16 centered on the display position P ' _A , is therefore visually superimposed, for user 2, on the first pedestrian U1 wishing to board the vehicle 1 (as illustrated in Figure 2).

Different variants can be made to the display method described above: certain optional steps, such as steps T1 and E10, could be eliminated, and the organization of the steps with respect to each other could be modified. As an example, the test step T2 could be executed before steps E31 to E33 (in the case where step T2 is based on a comparison between the position of the display system Ps and said position of the Pl environment, for example).

Furthermore, instead of receiving a request to take charge of one or more passengers, in step E1, the control unit could receive, in addition to the data relating to said position of the environment Pl, a indication that a user, for example a pedestrian or a cyclist, wishes to be visually highlighted in said environment E.

This variant of the process is useful especially when the vehicle approaches an area in which pedestrians are working on the edge or on the traffic lane used by the vehicle, for example for road works, or to repair a vehicle. Indeed, the display of said element superimposed on the pedestrian then draws the driver's attention to the presence of this pedestrian, and thus increases the safety of this pedestrian. In the context of this variant, it can be provided that several elements are visually superimposed in the environment of the display system, each on one of the pedestrians present in said intervention area.

In another variant, it can also be provided that the control unit is programmed to implement both this latter variant of the method, and that described in detail above with reference to FIG. 3. In this case,

- a first type of element (for example a green circle) is visually superimposed on a pedestrian wishing to be supported to make a journey,

- while a second type of element, different from the first (for example a red triangle), is superimposed visually on a pedestrian only wishing to be highlighted (for example for safety reasons).

The driver 2 of the vehicle can thus easily distinguish these two situations from one another. In the context of this latter variant, provision can also be made, in the case where an element of the second type would risk being superimposed on an element of the first type, to give priority to the element of the second type (signaling a pedestrian or a cyclist in a potentially exposed situation), the element of the first type then not being displayed.

FIG. 4 schematically represents the main steps of a display method according to a second embodiment. This method can be implemented by the display system 10 which has been described above, however, by programming the control unit 14 different from that presented above.

The main difference between the first and second embodiments of the display method is that, in the second embodiment, the display position P'a is determined by a remote, remote (and separate) data processing service of the display system 10, instead of being determined by the control unit 14 of this system.

This off-site data processing service is for example implemented by one or more servers, the display system 10 being able to exchange data with them via a computer network, for example the Internet, to which the system display 10 is connected using its communication module 13. Otherwise formulated, in this second embodiment, the display position P'a is determined by a "cloud computing" (or "cloud computing") technique, in French), instead of being determined by the control unit 14. Using this delocalized data processing service makes it possible to have greater computing power than that provided by the control unit 14 alone.

As shown in FIG. 4, the display method according to this second embodiment begins with step E01, which has been described previously (determination of said position of the environment Pl by the device for locating the communication system portable 20).

It continues with a step E02 ’, of transmitting data, representative of said position of the environment P1, by the portable communication device 20, intended for the delocalized data processing service. In step E02 ′, the portable communication device 20 also transmits the request mentioned above, which indicates that one or more pedestrians located at said position of the environment P1 wish to be supported in a vehicle to perform a path.

In the next AND step, the delocalized data processing service receives said data representative of the position of the environment Pl.

At the same time, in step E1 ", the control unit 14 receives the request for taking charge of the pedestrian or pedestrians, via its communication module 13.

After step E1 ”, the process continues with steps E2, then E20, which have been described above (determination of the position of the display system Ps, and of its orientation relative to the environment E, by its location device 12, then detection of the presence or absence of a pedestrian by the pedestrian detector 15).

After step E20, the process continues with a step E20 ’of transmission, from the display system 10 to the delocalized data processing service:

- data representative of the position of the display system Ps, and of its orientation with respect to the environment E,

- data indicating the presence or absence of pedestrians in the detection field F _D , and

- in the event of detection of one or more pedestrians, data representative of the positions ΡΊ, P’2 of the detected pedestrians U1, U2, determined by the pedestrian detector 15.

As a variant, in step E20 ’, the display system 10 could transmit to the off-site data processing service:

a datum representative of the position of the display system Ps, and of its orientation with respect to the environment E, and

- a signal captured by a sensor of the pedestrian detector, for example an image captured by the camera that this detector includes (rather than the data listed above).

Within the framework of this variant, the delocalized data processing service then processes this signal to determine the absence or the presence of pedestrians in the detection field F _D , and, if applicable, the position or positions of thereof.

After the transmission step E20 ′, the delocalized data processing service determines the display position P ′ _A , during a step E3 ′, identical to the step E3 which has been described above, if this it is only that it is executed by the remote data processing service instead of being executed by the control unit 14 of the display system 10.

After step E3 ′, the method continues with a step E3 ″, for transmitting data representative of the display position P ′ _A , from the data processing service outsourced to the display system. This data can be a data directly usable by the display 11 (such as a data representative of a two-dimensional position, on a screen of the head-up display, of the element to be displayed), and include a request display intended for this display 11.

In this second embodiment of the method, said datum, relating to the position of the environment P1, received by the display system 10, is therefore directly the datum representative of the display position P ' _A itself.

After step E3 ", the process continues with the display step E4 which has been described above. The process then resumes in step E2 (arrow F0 in Figure 4).

The variants and options of the first embodiment of the display method, described above, can also apply to the second embodiment of this method which has just been presented.

Claims (15)

1. Display system (10) for a vehicle (1), the display system (10) comprising: - a display (11) configured to display elements so that they are visually superimposed, for a user (2) of said system, on an environment (E) of the display system (10), a device for receiving data (13) by wireless link, and - a control unit (14) programmed for: - receive, via the reception device (13), data relating to a position of the environment (Pl), and for - command the display (11) to display an element (16) visually superimposed, in the environment (E) of the display system, at a display position (P ' _A ) as a function of said received data . 2. Display system (10) according to claim 1, comprising a locating device (12) of the display system (10), and in which the control unit (14) is programmed to determine said position of display (P ' _A ) as a function of said data received and of data representative of a position of the display system (Ps) determined by its location device (12). 3. Display system (10) according to claim 2, in which the display position (P ' _A ) is defined relative to the display system (10), and in which the control unit (14) is programmed to determine the display position (P ' _A ) so that it coincides, in the environment (E) of the display system (10), with said position of the environment (Pl). 4. Display system (10) according to one of claims 2 and 3, further comprising a pedestrian detector (15) adapted to detect one or more pedestrians (U1, U2) present in a detection field (F _D ) of the pedestrian detector (15), and to determine, for each pedestrian (U1, U2) detected, a position (ΡΊ, P'2) of this pedestrian relative to the display system (10), and in which l the control unit (14) is also programmed to, in the event of detection of one or more pedestrians (U1, U2) by the detection device (15), determine the display position (P ' _A ) as a function at least one of the positions (ΡΊ, P'2) of the detected pedestrian (s) determined by the pedestrian detector (15). 5. Display system (10) according to claim 4, in which the control unit (14) is additionally programmed for, in the event of detection of one or more pedestrians (U1, U2) by the detection device (15) - determine, on the basis of the position of the display system (Ps), a distance separating said position of the environment (Pl) from the position (ΡΊ, P'2) of at least one of the detected pedestrians ( U1, U2), and - when said distance is less than a predetermined threshold, determine the display position (P’a) so that it coincides with the position (ΡΊ, P’2) of said pedestrian, determined by the pedestrian detector (15). 6. Display system (10) according to one of claims 4 and 5, in which the control unit (14) is additionally programmed for, when the pedestrian detector (15) detects several pedestrians (U1, U2 ): - select, on the basis of: - positions (ΡΊ, P’2) of detected pedestrians (U1, U2) determined by the pedestrian detector (15), - the position of the display system (Ps), and - from said position of the environment (Pl), that of said pedestrians (U1) which is closest to said position of the environment (Pl), and for - determine the display position (P’a) so that it coincides with the position (ΡΊ) of the pedestrian (U1) previously selected. 7. Display system (10) according to claim 1, comprising a device for locating (12) the display system (10) and a device for transmitting (13) data by wireless link, in which said position display (P'a) is defined relative to the display system (10), and in which the control unit (14) is further programmed to: - transmit to a localized data processing service, by means of the transmission device (13), data representative of a position of the display system (Ps) determined by the location device (12), - receive in response, from said remote data processing service, said data relating to the position of the environment (Pl), this data being representative of the display position P’a itself. 8. Display method implemented by a display system (10) for a vehicle (1), located in an environment (E), comprising the following steps: - reception, via a reception device (13) of data by wireless link of the display system (10), of data relating to a position of the environment (Pl), and - display, by a display (11) of the display system (10), of an element (16) superimposed visually, in said environment (E), at a display position (P'a) depending on said data received. 9. The method according to claim 8, further comprising the steps of: - determination, by a location device (12) equipping the display system (10), of a position of the display system (Ps), and - determination of said display position (P’a), as a function of said position of the environment (Pl) and of said position of the display system (Ps). 10. The method of claim 9, wherein the display position (P'a) is defined relative to the display system (10), and wherein the display position is determined so as to coincide with said position of the environment (Pl). 11. Method according to one of claims 8 to 10, further comprising the steps of: - detection of one or more pedestrians (U1, U2) present in a detection field (Fd) of a pedestrian detector (15) fitted to the display system (10), or, on the contrary, of an absence pedestrian in this detection field (Fd), and - in the event of detection of one or more pedestrians (U1, U2) present in the detection field (Fd), determination, for each pedestrian (U1, U2) detected, of a position (ΡΊ, P'2) of this pedestrian with respect to the display system (10), and in which the display position (P'a) is determined as a function of at least one of the positions (ΡΊ, P'2) of the detected pedestrian or pedestrians determined by the pedestrian detector (15). 12. The method according to claim 11, further comprising the steps of: - determination, on the basis of the position of the display system (Ps), of a distance separating said position of the environment (Pl) from the position (ΡΊ, P'2) of at least one of the pedestrians detected, and - determination of the display position (P'a) so that it coincides with the position (ΡΊ, P'2) of said pedestrian determined by the pedestrian detector (15), when said distance is less than one predetermined threshold. 13. Method according to one of claims 11 and 12, further comprising a step of: - selection of the one of said pedestrians (U1, U2) which is closest to said position of the environment (Pl), when the pedestrian detector (15) detects several pedestrians, on the basis: - positions (ΡΊ, P’2) of detected pedestrians determined by the pedestrian detector (15), - the position of the display system (P _s ), and - of said position of the environment (Pl), and during which the display position (P’a) is determined so as to coincide with the position (ΡΊ) of the pedestrian (U1) previously selected. 14. Method according to one of claims 8 to 13, further comprising the steps of: - Determination, by a location system fitted to a portable communication device (20), of said position of the environment (Pl), said position of the environment (Pl) locating this portable communication device (20) in the environment (E), and - transmission of the data relating to said position of the environment (Pl), by the portable communication device (20). 15. Display method according to one of claims 8 to 13, further comprising steps: - reception, by a localized data processing service, of data representative of said position of the environment (Pl), - determination, by a localization device (12) equipping the display system (10), of a position of the display system (Ps), - transmission to the localized data processing service, by means of an emission device (13) of the display system (10), of a data representative of said position of the display system (Ps), - determination of said display position (P'a) by the delocalized data processing system, as a function of the data representative of said position of the environment (Pl), and of the data representative of said position of the system d 'display (P _s ), transmission of the data processing service located outside the display system (10) of said data relating to the position of the environment (P1), in the form of data representative of said display position ( P ' _A ) previously determined by the offshored processing service.