Patent ID: 11928894
Assignee: ORIGIN WIRELESS, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. The system of claim 6, wherein:
the at least one motion feature is associated with at least one of: a time stamp in the time window and the at least one motion cycle; and
the at least one motion feature comprises at least one of the following speed-related features:
a motion speed,
a mean speed being A-average of motion speed in a subwindow of the time window around the time stamp, wherein the subwindow is at least one of: the whole time window, a sliding window, at least one motion cycle, at least one step segment and another subwindow, and wherein A-average comprises at least one of: an average, a weighted average and a trimmed mean,
a mean-subtracted speed being a motion speed minus a mean speed, a maximum speed being maximum of motion speed within the subwindow, a minimum speed being minimum of motion speed within the subwindow, a speed variance being variance of motion speed within the subwindow, a speed deviation being X-percentile of sample distribution of mean-subtracted speed in the subwindow, wherein X is a number between 0 and 100,
a maximum positive speed deviation being maximum of mean-subtracted speed in the subwindow, a maximum negative speed deviation being minimum of mean-subtracted speed in the subwindow, a speed peak variance being variance of local peak (local maximum) of motion speed in the subwindow, a speed valley variance being variance of local valley (local minimum) of motion speed in the subwindow,
at least one k-th speed-ACF-peak (k-SAP) being a k-th SAP at the time stamp, wherein SAP (speed-ACF-peak) is a local peak of an autocorrelation function (ACF) of motion speed at the time stamp, wherein k is a non-negative integer, a mean k-SAP being A-average of k-SAP in the subwindow, a k-SAP variance being variance of k-SAP in the subwindow, a k-SAP-difference (k-SAPD) being difference of k-th SAP and (k+1)-th SAP at the time stamp, a mean k-SAPD being A-average of k-SAPD in the subwindow, a k-SAPD variance being variance of k-SAPD in the subwindow, a speed-ACF-peak-count (SAPC) being a count of significant SAP at the time stamp, a mean SAPC being A-average of SAPC in the subwindow, a SAPC variance being variance of SAPC in the subwindow, a SAPC-pdf being a sample probability of SAPC being k in the subwindow, a SAPC-difference (SAPCD) being a difference of the SAPC and another SAPC at an adjacent time stamp, a mean SAPCD being A-average of SAPCD in the subwindow, a SAPCD variance being variance of SAPCD in the subwindow,
a speed recurrent plot (SRP) being a 2-dimensional plot of R(i,j), wherein i and j are running time indices in the subwindow, wherein R(i,j) is a similarity score of a first vector at time i and a second vector at time j, wherein each of first and second vectors is a vector at a time t comprising at least one speed-related feature in a sliding subwindow of the time window around the time t,
a SRP feature comprising at least one of: recurrence rate, determinism, entropy, average diagonal line, and another feature, of the SRP,
a generalized recurrent plot (GRP) being a 2-dimensional plot of R(i,j), wherein i and j are running time indices in the subwindow, wherein R(i,j) is a similarity score of a first vector at time i and a second vector at time j, wherein each of first and second vectors is a vector at a time t comprising at least one motion feature in a sliding subwindow of the time window around the time t,
a GRP feature comprising at least one of: recurrence rate, determinism, entropy, average diagonal line, and another feature, of the GRP,
a TSA feature of a time-scaled ACF (TSA), the TSA being an ACF of a speed-related feature in a subwindow of the time stamp with the ACF time axis scaled such that its first peak occurs at a selected time lag,
a speed harmonic ratio associated with a motion cycle, each being a ratio of sum of amplitude of even harmonics of Fourier transform of motion speed in the motion cycle to sum of amplitude of odd harmonics of the Fourier transform, a speed harmonic feature associated with a motion cycle, being computed based on a function of even terms of a frequency transform of motion speed of the motion cycle and on the function of odd terms of the frequency transform, a generalized speed harmonic feature associated with the at least one motion cycle and computed based on a first function of even terms of a transform of speed-related features in the at least one motion cycle and a second function of odd terms of the transform, a generalized harmonic feature associated with the at least one motion cycle and computed based on a first function of even terms of a transform of motion features in the at least one motion cycle and a second function of odd terms of the transform,
a left-right-step speed symmetry feature, a function of at least one of the above features,
and a function of another feature.