Movement detection method and device with a thresholding algorithm per envelope
AssigneeCommissariat a l'Energie Atomique
InventorArnaud VERDANT
Life of this patent
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Abstract
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 Sn and/or M1n-1; the calculation of a signal Δn=|M1n−Sn|; the calculation of a second mean M2n of Δn in function of M2n-1 and/or Δn; the calculation of a third mean M3n of the signal (Sn−k1·M2n) in function of M3n-1 and/or (Sn−k1·M2n); the calculation of a fourth mean M4n of the signal (Sn+k2·M2n) in function of M4n-1 and/or (Sn+k2·M2n); wherein a movement is considered as detected from the result of at least one comparison made of the signals Sn, (M3n−M2n) and (M4n+M2n) where n: natural whole number
Claims31
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 signal Δn=|M1n−Sn|;
- the calculation of a second mean M2n of the signal Δn in function of a previous value M2n-1 and/or the value of the signal Δn;
- the calculation of a third mean M3n of the signal (Sn−k1·M2n) in function of a previous value M3n-1 and/or the value of the signal (Sn−k1·M2n);
- the calculation of a fourth mean M4n of the signal (Sn+k2·M2n) in function of a previous value M4n-1 and/or the value of the signal (Sn+k2·M2n);
- wherein a movement is considered as detected from the result of at least one comparison made of the signals Sn, (M3n−M2n) and (M4n+M2n)
- where n:
- natural whole number;
- and k1 and k2:
- non-null positive real numbers.
A movement detection device at least comprising:
- 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 a n-th captured image, in function of the value of the signal Sn and/or a previous value M1n-1;
- means of calculating a signal Δn=|M1n−Sn|;
- means of calculating a second mean M2n of the signal Δn in function of a previous value M2n-1 and/or the value of the signal Δn;
- means of calculating a third mean M3n of the signal (Sn−k1·M2n) in function of a previous value M3n-1 and/or the value of the signal (Sn−k1·M2n);
- means of calculating a fourth mean M4n of the signal (Sn+k2·M2n) in function of a previous value M4n-1 and/or the value of the signal (Sn+k2·M2n);
- wherein a movement is considered as detected from the result obtained at the output of the means of comparison which make at least one comparison of the signals Sn, (M3n−M2n) and (M4n+M2n)
- where n:
- natural whole number;
- and k1 and k2:
- non-null positive real numbers.
Dependencies are inferred from the claim text.