Method and device for adapting a signal for the detection of the movement of an object
First Claim
1. A method of adjusting a signal used for the detection of a parameter carried by a signal, wherein the parameter is represented by a set of data Aij, associated with pixels forming a multidimensional space i, j, evolving with time, and represented at a succession of instants T, wherein the data are associated with the parameter A in the form of a digital signal DATA(A), composed of a sequence A1jt of binary numbers of n bits associated with synchronization signals defining the instant T of the space, and the position i, j, in the space, in which the signals Aijt are received, the method comprising:
- receiving the signal Aijt from a signal amplifier;
comparing each value Aijt with a smoothed value AIijt so as to determine the variation of the signal Aijt at a given point in the space i, j, wherein AI1jt is derived from the previous values of A1jt in relation to a time constant COijt, generating a signal ABSijt=|A1jt−
AIijt|;
generating binary threshold values DPijt of Aijt in relation to a threshold S;
modifying the time constant values COijt based on the corresponding overshoot threshold DP1jt;
calculating histograms for ABS1jt=|Aijt−
AI1jt|;
calculating histograms for Aijt; and
adjusting the threshold S based on the calculated histograms of ABS so as to adjust the detection sensitivity of the variation of the parameter A; and
adjusting the gain of the amplifier based on the calculated histograms of Aijt so as to adjust the amplitude of the received signal A1jt.
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Abstract
Systems and methods for adjusting a signal used for the detection of the movement of an object in a space represented by a set of data Aij, associated with pixels forming a multidimensional space i, j, evolving with time, and represented at a succession of instants T, wherein the data are associated with the parameter A in the form of a digital signal DATA(A), composed of a sequence A1jt of binary numbers of n bits associated with in which the signals A1jt are received, in which the threshold and the gain in detection sensitivity of the parameter A are adapted.
The detection sensitivity of the parameter variation is also adapted.
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Citations
14 Claims
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1. A method of adjusting a signal used for the detection of a parameter carried by a signal, wherein the parameter is represented by a set of data Aij, associated with pixels forming a multidimensional space i, j, evolving with time, and represented at a succession of instants T, wherein the data are associated with the parameter A in the form of a digital signal DATA(A), composed of a sequence A1jt of binary numbers of n bits associated with synchronization signals defining the instant T of the space, and the position i, j, in the space, in which the signals Aijt are received, the method comprising:
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receiving the signal Aijt from a signal amplifier;
comparing each value Aijt with a smoothed value AIijt so as to determine the variation of the signal Aijt at a given point in the space i, j, wherein AI1jt is derived from the previous values of A1jt in relation to a time constant COijt, generating a signal ABSijt=|A1jt−
AIijt|;
generating binary threshold values DPijt of Aijt in relation to a threshold S;
modifying the time constant values COijt based on the corresponding overshoot threshold DP1jt;
calculating histograms for ABS1jt=|Aijt−
AI1jt|;
calculating histograms for Aijt; and
adjusting the threshold S based on the calculated histograms of ABS so as to adjust the detection sensitivity of the variation of the parameter A; and
adjusting the gain of the amplifier based on the calculated histograms of Aijt so as to adjust the amplitude of the received signal A1jt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for adjusting a signal used for the detection of the movement of an object in a space represented by a set of data Aij associated with pixels forming a multidimensional space i, j, evolving with time, and represented at a succession of instants T, wherein the data are associated with the parameter A in the form of a digital signal DATA(A), composed of a sequence Aijt of binary numbers of n bits associated with synchronization signals defining the instant T of the space and the position i, j, in the space in which the signals Aijt are received, the device comprising:
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an amplifier that provides the signals Aijt;
a processing unit including an input that receives the signals Aijt from the amplifier, wherein the processing unit determines the values of a time constant COijt and an overshoot value DPijt by comparing each value Aijt with a smoothed value ALijt derived from previous values of Aijt in relation to the time constant CO1jt, wherein the comparison generates an overshoot value DPijt of Aijt in relation to a threshold value, wherein COijt is modified in relation to DP1jt, and wherein the processing unit generates a sequence ABSijt=|Aijt−
AIitl;
a first histogram calculation unit that receives and processes the sequence Aijt and controls the amplifier to adjust the amplitude of the parameter A; and
a second histogram calculation unit that receives and processes the sequence ABSijt and controls the threshold value used by the processing unit so as to adjust the detection sensitivity of the variation of the parameter A. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification