Method for measuring a time delay between two output signals measured by two adjacent optical sensors, the time delay resulting from a movement of an object moving in a given direction, the method comprising: - carrying out a spatial filtering of the signals Ph 1 and Ph 2 delivered by a first and a second optical sensor (D 1, D 2), the optical axes of the first and the second optical sensors (D 1, D 2) forming an inter-receptor angle (Δφ) containing the object; - calculating a first order derivative and carrying out a temporal band-pass filtering of the signals delivered by the first and second optical sensors (D 1, D 2) in order to obtain signals Ph 1 '(t) and Ph 2 '(t); - calculating the second order derivative of the signals delivered by the first and second sensors (D 1, D 2) in order to obtain signals Ph 1 "(t) and Ph 2 " (t); - measuring the delay (Δt) between the signals delivered by the first and second optical sensors (D 1, D 2), the delay depending on the angular velocity of the luminance transition zone of the object; characterized in that the step of measuring the delay (Δt) is a feedback loop based on an estimated delay between the temporally filtered signals delivered by the first and second optical sensors, the feedback loop comprising the steps of: - estimating a time delay (Δt(t n)) at an instant t n between the temporally filtered signals delivered by the first and second optical sensors; - calculating the error Ph diff (t n) at the instant t n between the temporally filtered signal delivered by the second optical sensor Ph 2 '(t n) at the instant t n and the temporally filtered signal Ph 1 '(t n -Δt(t n)) delivered by the first optical sensor and delayed by the estimated delay (Δt(t n)); and - estimating whether Ph diff (t n)≠0 i.e. whether a delay error Δt error (t n) exists; - if Ph diff (t n)≠0, estimating whether the delay error (Δt error (t n)) is smaller or bigger than zero on the basis of the error Ph diff (t n) and the second order derivative (Ph 1 "(t), Ph 2 "(t)) of the signals delivered by the first and second sensors (D 1, D 2) - calculating the evolution of the delay (Δt(t)) at the instant t n on the basis of Δt(t n) and Δt error (t n). - carrying out a spatial filtering of the signals Ph 1 and Ph 2 delivered by a first and a second optical sensor (D 1, D 2), the optical axes of the first and the second optical sensors (D 1, D 2) forming an inter-receptor angle (Δφ) containing the object; - calculating a first order derivative and carrying out a temporal band-pass filtering of the signals delivered by the first and second optical sensors (D 1, D 2) in order to obtain signals Ph 1 '(t) and Ph 2 '(t); - calculating the second order derivative of the signals delivered by the first and second sensors (D 1, D 2) in order to obtain signals Ph 1 "(t) and Ph 2 " (t); - measuring the delay (Δt) between the signals delivered by the first and second optical sensors (D 1, D 2), the delay depending on the angular velocity of the luminance transition zone of the object; - estimating a time delay (Δt(t n)) at an instant t n between the temporally filtered signals delivered by the first and second optical sensors; - calculating the error Ph diff (t n) at the instant t n between the temporally filtered signal delivered by the second optical sensor Ph 2 '(t n) at the instant t n and the temporally filtered signal Ph 1 '(t n -Δt(t n)) delivered by the first optical sensor and delayed by the estimated delay (Δt(t n)); and - estimating whether Ph diff (t n)≠0 i.e. whether a delay error Δt error (t n) exists; - if Ph diff (t n)≠0, estimating whether the delay error (Δt error (t n)) is smaller or bigger than zero on the basis of the error Ph diff (t n) and the second order derivative (Ph 1 "(t), Ph 2 "(t)) of the signals delivered by the first and second sensors (D 1, D 2) - calculating the evolution of the delay (Δt(t)) at the instant t n on the basis of Δt(t n) and Δt error (t n).