Method for activating a vehicle function, and associated activation device

1 . A method for activating a vehicle function, by way of an activation device, on the basis of a visual recognition of a user, the activation device comprising at least one camera that is oriented toward the outside of the vehicle and equipped with visual recognition means, and at least one ultra-wideband transceiver capable of detecting a presence inside the vehicle, wherein the transceiver is first modified to allow it to transmit to the outside of the vehicle at different refresh rates, the method comprising:

a) transmitting ultra-wideband waves to the outside of the vehicle at a first refresh rate,

b) receiving the reflected waves,

c) detecting presence in a predetermined area around the vehicle,

d) adapting the refresh rate according to a distance between said presence and the vehicle, the frequency being higher when the presence is close to the vehicle,

e) activating the camera only when the presence has been detected at a distance below a threshold value,

f) identifying the presence by way of visual recognition, and

g) if the presence is identified as being the user, activating the vehicle function,

wherein the value of the refresh rate varies from 1 Hz to more than 100 Hz.

2 . The activation method as claimed in claim 1 , wherein the distance is determined by computing a time of flight of the waves and/or by computing an offset between a frequency of the transmitted waves and a frequency of the received reflected waves.

3 . A non-transitory computer program product comprising program code instructions for executing the steps of the method as claimed in claim 1 when said program is executed on a computer.

4 . A device for activating a vehicle function, activation being triggered by visual recognition of a user, the activation device comprising at least one camera that is oriented toward the outside of the vehicle and equipped with visual recognition means, and at least one ultra-wideband transceiver capable of detecting a presence inside the vehicle, wherein transceiver is modified in order to transmit to the outside of the vehicle and the device further comprises:

a) means for altering a refresh rate of the transmitted waves,

b) means for detecting presence in a predetermined area around the vehicle, and for adapting the means according to a position of the presence,

c) means for adapting the refresh rate according to a distance between said presence and the vehicle, the frequency being higher when the presence is close to the vehicle,

d) means for activating the camera only when the presence has been detected at a distance below a threshold value, and

e) means for activating the vehicle function according to the result of identification of said presence by way of visual recognition,

wherein the value of the refresh rate varies between 1 Hz and more than 100 Hz.

5 . The activation device as claimed in claim 4 , wherein the means for detecting and for adapting said means comprise means for computing a time of flight of the waves and/or for computing an offset between a frequency of the transmitted waves and a frequency of the received waves.

6 . A motor vehicle comprising an activation device as claimed in claim 4 .