Movement detection method and device with adaptive double filtering
AssigneeCommissariat a l'Energie Atomique
InventorArnaud VERDANT
Life of this patent
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Abstract
Movement detection method comprising the following steps: the calculation of a first mean M1n of a signal Sn designed to be supplied by one pixel of a pixel matrix which corresponds to an n-th captured image, in function of the value of the signal Sn and/or a previous value M1n−1; the calculation of a second mean M2n of the signal Sn in function of a previous value M2n−1 and/or the value of the signal Sn; the calculation of a signal Δn=|M1n−M2n|; the calculation of a third mean M3n of the signal Δn or k. Δn in function of a previous value M3n−1 and/or the value of the signal Δn; the comparison of the signals Δn and k.M3n or Δn and M3n, wherein a movement is considered as detected when Δn>k.M3n or Δn>M3n.
Claims18
A movement detection method comprising at least the following steps:
- the calculation of a first mean M1n of a signal Sn designed to be supplied by at least one pixel of a pixel matrix which corresponds to an n-th captured image, in function of the value of the signal Sn and/or a previous value M1n−1;
- the calculation of a second mean M2n of the signal Sn in function of a previous value M2n−1 and/or the value of the signal Sn;
- the calculation of a signal Δn=|M1n−M2n|;
- the calculation of a third mean M3n of the signal Δn or k.Δn in function of a previous value M3n−1 and/or the value of the signal Δn;
- the comparison of the signals Δn and k.M3n when M3n is the third mean of the signal Δn, wherein a movement is considered as detected when Δn>k.M3n, or the comparison of the signals Δn and M3n when M3n is the third mean of the signal k.Δn, wherein a movement is considered as detected when Δn>M3n;
- where k:
- non-null positive real number, and
- n:
- natural whole number.
A movement detection device comprising at least:
- means of calculating a first mean M1n of a signal Sn designed to be supplied by at least one pixel of a pixel matrix and corresponding to an n-th captured image, in function of the value of the signal Sn and/or a previous value M1n−1;
- means of calculating a second mean M2n of the signal Sn in function of a previous value M2n−1 and/or the value of the signal Sn;
- means of calculating a signal Δn=|M1n−M2n|;
- means of calculating a third mean M3n of the signal Δn or k.Δn, in function of a previous values M3n−1 and/or the value of the signal Δn;
- means of comparing the signals Δn and k.M3n when M3n is the third mean of the signal Δn, wherein a movement is considered as detected when Δn>k.M3n, or means of comparing the signals Δn and M3n when M3n is the third mean of the signal k.Δn, wherein a movement is considered as detected when Δn>M3n;
- where k:
- non-null positive real number, and
- n:
- natural whole number.
Dependencies are inferred from the claim text.