FR3147889A1 - Method and device for rendering evocative ambient visual content in a vehicle based on the vehicle's environment - Google Patents

Abstract

The present invention relates to a method and a device for rendering visual content in a vehicle (10). For this purpose, data of a first image of an external environment of the vehicle (10) are received from a camera (101) of the vehicle (10). This image data is analyzed to determine a set of characteristics of the first image. A second image is generated from the first image by modifying certain characteristics of the first image and by retaining other characteristics of this first image. A visual content representative of the second image is rendered in the vehicle (10) on at least one display device (13). Figure for abstract: Figure 1

Description

Method and device for rendering evocative ambient visual content in a vehicle based on the vehicle's environment

The present invention relates to methods and devices for rendering visual content in a vehicle, particularly but not exclusively in a motor vehicle. The present invention also relates to a method and device for generating an image based on vehicle environmental data.

Technological background

Some contemporary vehicles have several screens to display information useful to the driver for driving the vehicle as well as comfort information, such as information for interacting with the vehicle's infotainment system, also called IVI (In-Vehicle Infotainment) system.

Among these screens, it is known to embed one or more LCD type screens (from the English “Liquid Crystal Display” or in French “Display à cristaux liquide”), for example of the TFT type (from the English “Thin-Film Transistor” or in French “Transistor en film mince”), or OLED (from the English “Organic Light-Emitting Diode” or in French “Diode électroluminescente biologique”).

Wallpapers are sometimes used to generate a specific mood in the vehicle, for example to provide a specific mood in the vehicle's interior.

Some vehicles are also equipped with ambient lighting in the passenger compartment, for example using LEDs (from the English “Light-Emitting Diode” or “electroluminescent diode” in French).

While it is possible to customize certain ambient lighting parameters (for example, the color of the background screen or the color of the LEDs), the customization remains limited, which limits the user experience with regard to ambient lighting in the passenger compartment of the vehicle.

Summary of the present invention

An object of the present invention is to solve at least one of the problems of the technological background described above.

Another object of the present invention is to improve the user experience for the restitution of a sound ambiance in a vehicle.

Another purpose is to improve the ambient lighting in a vehicle.

According to a first aspect, the present invention relates to a method for rendering visual content in a vehicle, the vehicle carrying a camera having in its field of vision at least part of an environment outside the vehicle, the vehicle further carrying a display system comprising at least one display device, the method comprising the following steps:
- reception of first data representative of a first image acquired by the camera;
- determination, from the first data, of characteristics representative of at least part of the first image;
- reception of second data representative of a rendering mode representative of a specific lighting ambiance;
- generation of a second image by transformation of at least part of the first image,
the transformation comprising a modification, as a function of the second data, of a first part of the characteristics of the at least one part of the first image in the second image and a conservation of a second part of the characteristics of the at least one part of the first image in the second image;
- controlling the rendering of visual content representative of the second image on the at least one display device.

Taking into account the environment in which the vehicle is located from an image of the vehicle's external environment, in particular the characteristics of the image, for rendering visual content in the vehicle makes it possible to improve the user experience when the user is inside their vehicle. This in fact makes it possible to generate visual content according to a desired lighting ambiance based on characteristics of an image of the environment around the vehicle, for example in real time and as the vehicle moves.

The visual content rendered in the vehicle is thus better suited to the vehicle's environment, allowing for example to improve the driver's ability to understand the environment in which he is driving.

Alternatively, the features belong to a set of features including:
- a color;
- saturation;
- a gamma;
- a luminance; and
- a contrast.

According to another variant, the transformation comprises a modification of the color of the at least one part of the first image to obtain the color of the second image, the luminance and the contrast of the second image corresponding to the luminance and the contrast of the at least one part of the first image.

According to a further variant, said transformation further comprises a modification of the saturation of the at least one part of the first image to obtain the saturation of the second image and/or a modification of the gamma of the at least one part of the first image to obtain the gamma of the second image.

According to yet another variant, the transformation further comprises smoothing of at least part of the first image.

According to an additional variant, the second image is further obtained by selecting a part of the first image.

According to another variant, the at least one display device belongs to a set of display devices comprising:
- a display screen;
- a matrix of LEDs;
- an arrangement of LEDs; and
- a projector.

According to a second aspect, the present invention relates to a device for rendering visual content in a vehicle, the device comprising a memory associated with a processor configured for implementing the steps of the method according to the first aspect of the present invention.

According to a third aspect, the present invention relates to a display system comprising a device as described above according to the second aspect of the present invention and at least one display device communicatively connected to the device as described above according to the second aspect of the present invention.

According to a fourth 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 or a display system as described above according to the third aspect of the present invention.

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

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

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

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

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

Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to perform or to be used in performing the method in question.

Brief description of the figures

Other characteristics and advantages of the present invention will emerge from the description of the particular and non-limiting exemplary embodiments of the present invention below, with reference to the appended figures 1 to 3, in which:

schematically illustrates a portion of a vehicle passenger compartment, according to a particular exemplary embodiment of the present invention;

schematically illustrates a device configured for rendering visual content in the vehicle of the , according to a particular and non-limiting exemplary embodiment of the present invention;

illustrates a flowchart of the different steps of a process for rendering visual content in the vehicle of the , according to a particular and non-limiting exemplary embodiment of the present invention.

Description of examples of implementation

A method and device for rendering visual content in a vehicle will now be described in the following with joint reference to Figures 1 to 3. The same elements are identified with the same reference signs throughout the description which follows.

According to a particular and non-limiting example of embodiment of the present invention, the rendering of visual content in a vehicle, in particular in the passenger compartment of the vehicle, comprises the reception of first data representative of one or more first images of a part of the exterior environment of the vehicle acquired by a camera on board the vehicle. These first image data are analyzed or processed according to any known image processing method to determine or extract characteristics of the first image, such as the colors composing this first image, the dominant color(s), the saturation, the gamma, the luminance and/or the contrast. Second data representative of a rendering mode associated with a determined lighting ambiance are received, for example after selection of this rendering mode via an HMI (Human-Machine Interface) of the vehicle. A second image is generated by transformation of the first image, or of only a part of this first image (for example following a selection of a part of the image to generate the second image from this part selected in the first image). The characteristics of the second image are obtained by transforming one or more characteristics of the first image and retaining one or more other characteristics of the first image. The second image thus generated is used for rendering visual content on one or more display devices embedded in the vehicle to generate a particular lighting ambiance.

There schematically illustrates a portion of the passenger compartment of a vehicle 10, according to a particular and non-limiting exemplary embodiment of the present invention.

The vehicle 10 corresponds for example to a vehicle with a thermal engine, with electric motor(s) or even a hybrid vehicle with a thermal engine and one or more electric motors. The vehicle 10 thus corresponds for example to a land vehicle comprising a passenger compartment or at least equipped with a display screen, for example an automobile, a truck, a coach, a motorcycle.

The vehicle 10 advantageously carries one or more cameras 101 configured for the acquisition of image data of the environment of the vehicle 10, in particular the exterior environment of the vehicle 10.

The vehicle 10 for example carries a camera 101, called a front camera. Such a camera 101 is advantageously arranged in the passenger compartment of the vehicle 10 under the windshield and at the top and in the middle of this windshield. Such a front camera 101 has a field of vision corresponding to the space located in front of the vehicle 10 according to the direction of travel of the vehicle 10.

The camera 101 comprises, for example, the following elements:
- a photosensitive sensor corresponding for example to a matrix of photoreceptors associated for example with a Bayer filter;
- an optical assembly arranged in front of the sensor with respect to the scene to be acquired by the sensor, the optical assembly comprising for example an arrangement of one or more lenses; and
- optionally one or more calculators associated with memory and configured for processing images acquired by the sensor.

According to another example, the vehicle 10 has a camera arranged at the front grille or at the front bumper, such a camera having in its field of vision the portion of road passing in front of the vehicle 10. Such a camera is for example used for the detection and recognition of road markings (lines drawn on the road). Such a camera is for example protected from the external environment by a protective window.

In yet another example, the vehicle 10 has a camera mounted on or in each exterior rearview mirror.

The data obtained from this camera 101 (and/or other on-board cameras) are transmitted to one or more computers on board the vehicle 10, in particular within the framework of the process described below and/or within the framework of the method described below with regard to the .

The vehicle 10 further includes a display system comprising one or more display devices. The display device(s) correspond, for example, to one or more of the following display devices, in any combination:
- one or more screens such as for example a screen 13 with a touch interface and a computer configured to control the display of content(s) of a graphical HMI on the touch screen 13; and/or
- a display screen 12 corresponding for example to a transparent or semi-transparent blade 12, for example arranged on top of the dashboard 11 in front of the windshield of the electric vehicle 10. The transparent blade 12 is for example arranged behind the steering wheel 14, according to the point of view of a driver installed in the driver's seat 15, such that the driver sees the content displayed or projected on the transparent blade 12 when the driver is driving the electric vehicle 10. The transparent blade 12 thus corresponds to an element of a device or system called a head-up display. Such a display system comprises for example one or more projectors integrated for example in the dashboard 11. Such a system for projecting images or graphic content corresponds for example to a so-called augmented reality system, called AR (from the English “Augmented Reality”), for example a Head-Up Display system, called VTH or HUD (from the English “Head Up Display” or in French “Display Tête Haute”), which allows the embedding of virtual objects in the driver's field of vision by projecting the images on the blade 12, so as to superimpose the virtual objects of the projected images on the real road scene. The projection of the images of the graphic object is for example controlled by one or more computers of the on-board system of the vehicle 10, for example by the IVI computer. The connection between the computer and the head-up display device corresponds for example to a connection of the LVDS type (from the English “Low Voltage Differential Signaling” or in French “Low Voltage Differential Transmission”); and/or
- a display screen called a handset or dashboard and generally arranged in an area 141 behind the steering wheel in the dashboard 11; and/or
- an arrangement of LEDs comprising for example several LEDs arranged in the form of an LED matrix and/or in the form of one or more lines or strips of LEDs; and/or
- one or more projectors configured to project one or more images or visual contents onto a surface, for example onto a portion of the windshield, onto the dashboard 11, onto the ceiling of the vehicle interior 10, etc.

The computers controlling the display system(s) (such as the computer of the infotainment system, called IVI (In-Vehicle Infotainment) computer) and/or the camera(s) 101 form, for example, a multiplexed architecture for the production of various services useful for the proper operation of the vehicle and for assisting the driver and/or passengers of the vehicle in controlling the on-board systems of the vehicle 10. The computers communicate and exchange data with each other via one or more computer buses, for example a communication bus of the CAN (Controller Area Network) type, CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (according to the ISO 17458 standard), LIN (Local Interconnect Network) type. or Ethernet (according to ISO/IEC 802-3 standard).

A process for controlling the rendering of visual content or controlling the rendering of such visual content is advantageously implemented by one or more devices embedded in the vehicle 10, for example by one or more computers of the embedded system of the vehicle 10.

According to one variant, the process is implemented by a system comprising the calculator(s) and one or more other devices or systems embedded in the vehicle 10, for example one or more cameras 101 and one or more display devices 13.

Visual content is represented by data such as image or image part data, the data being for example representative of a matrix of pixels, color values being for example associated with each pixel, for example according to one or more color channels. For example, the pixel data is encoded in the form of RGB values (from the English “Red, Green, Blue” or “Rouge, vert, bleu” in French).

In a first operation, first data representative of one or more first images are received from one or more cameras such as camera 101 are received by the computer implementing the process, for example the IVI computer.

The first data are for example received from the camera 101 or from a computer controlling the camera 101 via one or more data buses connecting the camera 101 to the computer implementing the process.

The first data are for example received at each instant of acquisition of an image by the camera 101. According to a variant, only a portion of the first data of the first images acquired by the camera 101 are received, for example at regular intervals. According to this variant, the computer receives an image every 200, 500 or 1000 ms or the computer receives 1 image every N images acquired by the camera 101, N being a number for example equal to 10, 20, 24 or 48 images.

According to one variant, the first data is received by the computer following a request sent by the computer to the camera 101 or to the computer controlling the camera 101 to receive the image data upon receipt of the request.

The remainder of the process will be described with reference to a first image for the sake of clarity. Of course, the process applies in the same manner for several first images, that is, for each first image of a plurality of first images acquired sequentially by the camera 101 for example.

In a second operation, a set of characteristics representative of at least a portion of the first image are determined by analyzing or processing the first data received in the first operation.

According to a particular embodiment, a portion of the first image received is selected before performing the processing operation(s) making it possible to obtain the characteristics of the first image. The selected portion corresponds for example to a portion surrounding or encompassing an area of interest in the first image, such an area of interest being determined according to any method known to those skilled in the art, for example via the determination of a saliency map or by searching for and recognizing a particular object of interest in the first image. According to another example, the selected portion corresponds to the central portion of the first image. According to yet another example, the selection of a portion of the first image corresponds to a selection of a portion of the pixels of the matrix forming the first image to reduce the definition or resolution of the first image and reduce the processing and analysis time of the first image.

The features extracted from the first image and representative of the first image correspond for example to features relating to color.

The characteristic(s) determined via the processing of the first data correspond, for example, to one or more of the following characteristics, in any possible combination:
- the color, for example the main color(s) of the first image, the set of colors associated with the pixels, one or more dominant colors in the first image, a color being for example expressed in gray level values (for example between 0 and 255) for each color channel (3 channels in the case of RGB coding); and/or
- the saturation of the first image, the saturation corresponding for example to a value representative of a difference of a color compared to a neutral gray of the same luminosity, the saturation being for example expressed on a scale between 00 and 99; and/or
- the gamma (also called contrast factor) of the first image, the gamma corresponding to a value or a number (for example between 1 and 3) representing the shape of a curve describing the transition from black to white or from white to black; and/or
- the luminance of the first image, representing a quotient between the luminous intensity of a light source and its total surface area, the luminance being measured in candela per square meter (cd/m²); and/or
- the contrast of the first image, the contrast characterizing the light distribution of the first image, the contrast being able for example to be interpreted as a spread of the brightness histogram of the image or as the ratio between the maximum brightness and the minimum brightness of the image, the contrast being represented by a value or a number.

The characteristics of the first image are determined according to any image processing method known to those skilled in the art, for example as described in the article “Color Indexing” by MJ Swain and DH Ballard, published in “International journal of computer vision” in 1991.

In a third operation, a second image is generated from the first data, that is, from the first image.

The second image is generated by transforming the first image (or the selected portion of the first image, if applicable). The second image is thus obtained by determining the characteristics of the second image from the characteristics of the first image, the characteristics of the first image and the second image being of the same nature or types (color, saturation, gamma, luminance, contrast).

The transformation implemented to determine the second image includes:
- a modification of one or more characteristics of the first image to obtain the corresponding characteristic(s) of the second image; and
- a conservation of one or more characteristics of the first image to obtain the corresponding characteristic(s) of the second image.

Such a transformation makes it possible to obtain a second image evoking, for example, a specific atmosphere or ambiance (via the modification of one or more characteristics of the first image) and recalling the environment in which the vehicle 10 is traveling (via the conservation of one or more characteristics of the first image), which makes it possible to avoid completely isolating the driver of the vehicle 10 from the environment in which he is traveling in order to maintain his attention on the environment.

The color characteristic(s) of the first image are advantageously modified in the transformation to obtain the color characteristic(s) of the second image. A modification of the color is for example obtained by applying one or more color filters to the first image to obtain the second image.

As an optional variation, the saturation and/or gamut of the first image is modified to obtain the saturation and/or gamut of the second image.

The modification of the characteristic(s) of the first image is for example obtained from one or more parameters applied to each characteristic of the first image to be modified, these parameters being for example stored in a memory of the vehicle 10 accessible by the computer implementing the process.

The modification parameters are for example associated with a rendering mode selected by a user, for example by the driver or a passenger of the vehicle 10, via an HMI of the vehicle 10.

The rendering mode is for example selected (for example via a touch interface of the screen 13 on which the content of the HMI is displayed allowing the desired rendering mode to be chosen), each rendering mode in the list being for example associated with a light ambiance, each light ambiance being configured to for example evoke a particular landscape (sea, mountain in winter, forest, desert, etc.) and/or a time of day (sunrise, sunset, day, night, etc.).

For example, if the selected render mode is associated with a forest-type ambiance, a green color filter is applied to the first image to obtain the second image.

To obtain a rendering of the second image with only two colors, for example, the first image is transformed into black and white (or shades of gray) and the black (or gray values above a threshold) is transformed into a first color and the white (or gray values below the threshold) is transformed into a second color to obtain the two colors of the second image.

The saturation and/or gamma are for example modified to obtain a second image with warmer or, on the contrary, duller hues or colors, depending on the selected rendering mode and the associated modification parameters, such parameters for the gamma and saturation corresponding for example to coefficients to be applied to the gamma and/or saturation of the first image.

The characteristic(s) of the first image whose associated values are not modified correspond for example to:
- luminance; and/or
- the contrast.

Thus, when generating the second image by transforming the first image, the luminance and/or contrast of the first image are kept identical to obtain the luminance and/or contrast of the second image. In other words, the luminance and/or contrast of the first image are identical or equal to the luminance and/or contrast of the second image.

According to a particular embodiment, the transformation further comprises one or more additional treatments, for example:
- smoothing of the first image (or of the selected part of the first image if applicable) to attenuate noise and/or obtain blur, for example by applying a Gaussian filter; and/or
- a reduction of the definition of the first image to obtain the definition of the second image.

Smoothing or blurring the image can, for example, reduce the visibility of certain details or objects shown in the first image, for example to avoid distracting the driver who might be attracted by these details or objects displayed.

The additional processing(s) depends for example on the type of display device used to render the visual content, which corresponds for example to the second image or the second image after the additional processing(s).

For example, when the display device corresponds to a matrix of LEDs, a group of pixels of the second image is associated with each LED (according to the position of each LED in the matrix of LEDs, the group of pixels selected for an LED having a spatial position in the second image corresponding to the spatial position of the LED considered in the matrix), the color information of each pixel of the group of pixels being for example averaged to obtain the color to be rendered by the LED.

The additional processing applied to the second image obtained from the characteristics of the first image is for example a function of the definition of the display device.

In a fourth operation, the rendering of the visual content (corresponding to the second image or to the second image to which one or more additional image processing operations are applied) is controlled by the computer so that the visual content is displayed and/or projected onto the display device(s) configured to obtain a light ambiance in the passenger compartment of the vehicle 10.

Rendering includes displaying or projecting the visual content on the display device(s) provided for that purpose.

There schematically illustrates a device 3 configured to control the rendering of visual content in a vehicle, for example in the vehicle 10, according to a particular and non-limiting exemplary embodiment of the present invention. The device 2 corresponds for example to a device embedded in the vehicle 10, for example a calculator.

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

The device 2 comprises one (or more) processor(s) 20 configured to execute instructions for carrying out the steps of the method and/or for executing the instructions of the software(s) embedded in the device 2. The processor 20 may include integrated memory, an input/output interface, and various circuits known to those skilled in the art. The device 2 further comprises at least one memory 21 corresponding for example to a volatile and/or non-volatile memory and/or comprises a memory storage device which may comprise volatile and/or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic or optical disk.

The computer code of the embedded software(s) comprising the instructions to be loaded and executed by the processor is for example stored in the memory 21.

According to various particular embodiments, the device 2 is coupled in communication with other similar devices or systems and/or with communication devices, for example a TCU (from the English “Telematic Control Unit” or in French “Telematic Control Unit”), for example via a communication bus or through dedicated input/output ports.

According to a particular and non-limiting embodiment, the device 2 comprises a block 22 of interface elements for communicating with external devices, for example a remote server or the “cloud”, other nodes of the ad hoc network. The interface elements of the block 32 comprise one or more of the following interfaces:
- RF radio frequency interface, for example of the Bluetooth® or Wi-Fi® type, 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”);
- LIN interface (from the English “Local Interconnect Network”).

According to another particular embodiment, the device 2 comprises a communication interface 23 which makes it possible to establish communication with other devices (such as other computers of the on-board system) via a communication channel 230. The communication interface 23 corresponds for example to a transmitter configured to transmit and receive information and/or data via the communication channel 230. The communication interface 23 corresponds for example to a wired network of the CAN (Controller Area Network), CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (standardized by the ISO 17458 standard) or Ethernet (standardized by the ISO/IEC 802-3 standard).

According to an additional particular embodiment, the device 2 can provide output signals to one or more external devices, such as a display screen 240, one or more speakers 250 and/or other peripherals 260 (projection system) via output interfaces 24, 25 and 26 respectively. According to a variant, one or other of the external devices is integrated into the device 2.

There illustrates a flowchart of the different steps of a method for controlling the rendering of visual content in a vehicle, for example the vehicle 10, according to a particular and non-limiting exemplary embodiment of the present invention. The method is for example implemented by a device embedded in the vehicle 10, for example by one or more processors embedded in the vehicle 10, or by the device 2 of the .

In a first step 31, first data representative of a first image acquired by a camera on board the vehicle 10 are received, the camera having in its field of vision at least part of an environment outside the vehicle.

In a second step 32, characteristics representative of at least part of the first image are determined from the first data.

In a third step 33, second data representative of a rendering mode representative of a determined lighting ambiance are received, for example from a memory of the vehicle or of the device 2.

In a fourth step 34, a second image is generated by transforming the at least one part of the first image, the transformation comprising a modification, as a function of the second data, of a first part of the characteristics of the at least one part of the first image in the second image and a conservation of a second part of the characteristics of the at least one part of the first image in the second image.

In a fifth step 35, the rendering of visual content representative of the second image is controlled so that the visual content is displayed on at least one display device on board the vehicle.

According to an alternative embodiment, the variants and examples of the operations described in relation to the apply to the process steps of the .

Of course, the invention is not limited to the embodiments described above but extends to a method for displaying visual content representative of an evocative lighting ambiance in a vehicle that would include secondary steps without thereby departing from the scope of the present invention. The same would apply to a device configured for implementing such a method.

The invention also relates to a system comprising the device 2 of the connected in communication with one or more display devices on board the vehicle.

According to one variant, the system further comprises one or more cameras embedded in the vehicle and connected in communication to the device 2.

The invention also relates to a vehicle, for example an automobile or more generally an autonomous vehicle with a land motor, comprising the device 2 of the or the above system.

Claims (10)

Method for rendering visual content in a vehicle (10), said vehicle (10) carrying a camera (101) having in its field of vision at least part of an external environment of said vehicle (10), said vehicle further carrying a display system comprising at least one display device (13), said method comprising the following steps:
- reception (31) of first data representative of a first image acquired by said camera (101);
- determination (32), from said first data, of characteristics representative of at least part of said first image;
- reception (33) of second data representative of a rendering mode representative of a determined lighting ambiance;
- generation (34) of a second image by transformation of said at least part of the first image,
said transformation comprising a modification, as a function of said second data, of a first part of said characteristics of said at least one part of the first image in said second image and a conservation of a second part of the characteristics of said at least one part of the first image in said second image;
- control (35) of the rendering of a visual content representative of said second image on said at least one display device (13). Method according to claim 1, wherein said characteristics belong to a set of characteristics comprising:
- a color;
- saturation;
- a gamma;
- a luminance; and
- a contrast. The method of claim 2, wherein said transformation comprises modifying the color of said at least one portion of the first image to obtain the color of said second image, the luminance and contrast of the second image corresponding to the luminance and contrast of said at least one portion of the first image. The method of claim 3, wherein said transformation further comprises modifying the saturation of said at least one portion of the first image to obtain the saturation of the second image and/or modifying the gamma of said at least one portion of the first image to obtain the gamma of the second image. Method according to one of claims 1 to 4, for which said transformation further comprises a smoothing of said at least one part of the first image. Method according to one of claims 1 to 5, for which said second image is further obtained by selecting a part of said first image. Method according to one of claims 1 to 6, for which said at least one display device (13) belongs to a set of display devices comprising:
- a display screen;
- a matrix of LEDs;
- an arrangement of LEDs; and
- a projector. Device (2) for rendering visual content in a vehicle (10), said device (2) comprising a memory (21) associated with at least one processor (20) configured for implementing the steps of the method according to any one of claims 1 to 7. Display system comprising the device (2) according to claim 8 and at least one display device (13) communicatively connected to said device (2). Vehicle (10) comprising the device (2) according to claim 8 or the display system according to claim 9.