Abstract: A device is provided for measuring speed and/or position of a vehicle moving along a guidance track, by day and by night, and doing so whatever the climatic conditions. Such a device includes at least one image capture apparatus delivering a sequence of digital images of an environment of the vehicle; an apparatus that determines the apparent motion of at least one visual index, called a primitive, between two images delivered by the image capture apparatus, so as to determine the apparent motion of said at least one visual index; and an apparatus that estimates speed and/or the position of the vehicle on the basis of the apparent motion of the at least one visual index.

Abstract: A device is provided for measuring speed and/or position of a vehicle moving along a guidance track, by day and by night, and doing so whatever the climatic conditions. Such a device includes at least one image capture apparatus delivering a sequence of digital images of an environment of the vehicle; an apparatus that determines the apparent motion of at least one visual index, called a primitive, between two images delivered by the image capture apparatus, so as to determine the apparent motion of said at least one visual index; and an apparatus that estimates speed and/or the position of the vehicle on the basis of the apparent motion of the at least one visual index.