Abstract: A system and method for determining a region of interest in an image, characterized in that it comprises the following steps: a plurality of lines Li i=1, . . . , n formed by pixels is defined in the image; in each line Li, a plurality of segments Sj j=1, . . . , m constituted by pixels is defined; a luminance level NVG(Sj) is calculated for each segment Sj based on the luminance of the pixels constituting this segment Sj; depending on this luminance level NVG(Sj) the segment Sj is selected or excluded from the region of interest; and the region of interest is obtained by amalgamating all the segments selected for each line.

Abstract: An automatic headlight switching procedure for motor vehicles, designed to emit a beam of light from one lighting mode to another lighting mode. The process features the steps of when the headlights are in a first lighting mode, detecting the backscatter of the headlight beam onto a phenomenon of visibility disturbance; increasing the lighting range of the headlight beam in relation to a maximum authorized range in accordance with the detected backscatter; and switching the headlights to a second lighting mode when the backscatter is below a first determined threshold.

Abstract: A process and system for detecting a phenomenon limiting the visibility for a motor vehicle. The process and system comprises the steps of determining at least one point of interest in an image captured of the environment of the vehicle (CALC_H(I)); determining a region of interest in the image (CALC_ROI(I)); determining a graph of different levels of grey on the basis of said region of interest (CALC_CL(ROI)), and determining an area in said graph of different levels of grey around said point of interest (CALC_A(CL, H)).

Abstract: A method of detecting a visibility interference phenomenon for a motor vehicle. The method includes the steps of: determining a region of interest (ROI) in an acquired image (I) of the environment (E) of the vehicle (V); determining a grey-level curve (CL) from the region of interest (ROI); calculating at least one tangent (TG) from at least one point of interest (PT) in the grey-level curve (CL); and determining a directing coefficient (CF) from the tangent (TG).

Abstract: A process for the detection from a vehicle of a visibility interference phenomenon, comprising the following steps: the emission of a beam of light to illuminate the rear of the vehicle, the beam of light being emitted into a field of vision of a camera mounted in the vehicle, and the determination of a presence and the nature of a visibility interference phenomenon on the basis of at least one image captured by the camera.

Abstract: A system and method for defining a window to search a region of interest for processing a road image, the search window having a longitudinal orientation directed according to the height of the image and being laterally delimited by two edges. The shape of the search window is adapted to the road configuration by defining at least one non-vertical portion on one of the edges. A preferred application is the processing of road images for determining visibility distances in foggy weather.

Abstract: A system and method for determining a region of interest in an image, characterized in that it comprises the following steps: a plurality of lines Li i=1, . . . , n formed by pixels is defined in the image; in each line Li, a plurality of segments Sj j=1, . . . , m constituted by pixels is defined; a luminance level NVG(Sj) is calculated for each segment Sj based on the luminance of the pixels constituting this segment Sj; depending on this luminance level NVG(Sj) the segment Sj is selected or excluded from the region of interest; and the region of interest is obtained by amalgamating all the segments selected for each line.

Abstract: A method for detecting a phenomenon affecting visibility generated by an automotive vehicle, comprising the steps of emitting a first beam of light, which beam of light can be reflected by an obstacle; emitting a second reference beam of light using a second emitting source; receiving on a receiver the reflected beam of light resulting from the first beam of light being reflected by an obstacle, and the second beam of light sent directly to the input of the receiver; generating one or more detection signals as a function of a combination of the reflected beam of light in the event of an obstacle and a reference beam; and comparing the modulation of one or more detection signals generated using reference data. According to the invention, the first and second beams of light are infra-red beams, and they are directed towards the rear of the vehicle.

Abstract: An automatic headlight switching procedure for motor vehicles, designed to emit a beam of light from one lighting mode to another lighting mode. The process features the steps of when the headlights are in a first lighting mode, detecting the backscatter of the headlight beam onto a phenomenon of visibility disturbance; increasing the lighting range of the headlight beam in relation to a maximum authorized range in accordance with the detected backscatter; and switching the headlights to a second lighting mode when the backscatter is below a first determined threshold.

Abstract: In the invention, a light device is proposed equipped with a DC motor for causing the tilting of a pivoting plate, in addition, in the invention, a solution is proposed for preventing the DC motor from degrading too quickly. To this end, it is therefore proposed to limit, for example by means of an electronic control card, the supply current to the motor to a limitation threshold, at least during the phases in which the DC motor is functioning in locked torque.

Abstract: A method of detecting a visibility interference phenomenon for a motor vehicle. The method includes the steps of: determining a region of interest (ROI) in an acquired image (I) of the environment (E) of the vehicle (V); determining a grey-level curve (CL) from the region of interest (ROI); calculating at least one tangent (TG) from at least one point of interest (PT) in the grey-level curve (CL); and determining a directing coefficient (CF) from the tangent (TG).

Abstract: A process and system for detecting a phenomenon limiting the visibility for a motor vehicle. The process and system comprises the steps of determining at least one point of interest in an image captured of the environment of the vehicle (CALC_H(I)); determining a region of interest in the image (CALC_ROI(I)); determining a graph of different levels of grey on the basis of said region of interest (CALC_CL(ROI)), and determining an area in said graph of different levels of grey around said point of interest (CALC_A(CL, H)).

Abstract: A process for the detection from a vehicle of a visibility interference phenomenon, comprising the following steps: the emission of a beam of light to illuminate the rear of the vehicle, the beam of light being emitted into a field of vision of a camera mounted in the vehicle, and the determination of a presence and the nature of a visibility interference phenomenon on the basis of at least one image captured by the camera.

Abstract: A method for detecting a phenomenon affecting visibility generated by an automotive vehicle, comprising the steps of emitting a first beam of light, which beam of light can be reflected by an obstacle; emitting a second reference beam of light using a second emitting source; receiving on a receiver the reflected beam of light resulting from the first beam of light being reflected by an obstacle, and the second beam of light sent directly to the input of the receiver; generating one or more detection signals as a function of a combination of the reflected beam of light in the event of an obstacle and a reference beam; and comparing the modulation of one or more detection signals generated using reference data. According to the invention, the first and second beams of light are infra-red beams, and they are directed towards the rear of the vehicle.

Abstract: A signal representing an image generated by at least one photosensitive device is processed in real-time to supply, from a scene to be observed having a high dynamic range between the signals corresponding to the darkest areas and to the brightest areas, an image containing no blooming areas. Images of different sensitivities are formed from the same scene to be observed. The brightness level of each point on the most sensitive image is determined. This level is compared with a predetermined threshold. The signal of the most sensitive image is delivered to the display device, for each elementary point on the most sensitive image having a brightness level below the predetermined threshold. An image signal calculated according to the brightness levels of the same elementary point in the images of different sensitivities is delivered to the display device, for any other elementary point on the most sensitive image.

Abstract: A night vision method and system for producing a colour infrared image of a road scene situated in front of a vehicle. At least one projection device emits an infrared light towards the road scene. A colour sensor captures a colour image of the road scene and a monochrome infrared sensor captures a monochrome infrared image of the road scene. The colour and monochrome infrared images are combined to obtain the colour infrared image of the road scene.

Abstract: The invention concerns a night vision method and system for a road scene comprising at least one projection device emitting an infrared light towards the road scene and a first sensor for capturing a first image of the road scene, this sensor being a colour sensor.

Abstract: In the invention, a light device is proposed equipped with a DC motor for causing the tilting of a pivoting plate, in addition, in the invention, a solution is proposed for preventing the DC motor from degrading too quickly. To this end, it is therefore proposed to limit, for example by means of an electronic control card, the supply current to the motor to a limitation threshold, at least during the phases in which the DC motor is functioning in locked torque.

Abstract: The present invention concerns a method for the real-time processing of a signal representing an image generated by at least one photosensitive device so as to supply, from a scene to be observed having a high dynamic range between the signals corresponding to the darkest areas and to the brightest areas, an image containing no blooming areas.