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IWR1443: Question on curves in Gesture Recognition – Twirl Example

Chris Meng
Mastermind 37726 points
Part Number: IWR1443

Hi,

How to understand the curves in Gesture Recognition – Twirl Example?

What's the meaning of X/Y axis in the figure of Active Bins in Range-Doppler and Weighted Doppler Signature? What's the difference between blue and red curve?

  • 0
    TI__Guru 50240 points
    Hi Chris,

    I'm sorry but our Gesture Recognition expert is unavailable until Monday but we will try to have an answer for you then.


    Cheers,
    Akash
  • Former Member
    0 Former Member
    Hello Chris,

    For both plots, the x axis is related to time/the frame number (0th frame being the oldest and 100th frame being new incoming data).
    The Y axis is the value of the "data signature" at that frame number.
    In the "Range-Doppler" signature it's the number of bins (in the range-doppler heat map) that meet the thresholds to be considered active for a twirl gesture.
    Using the active bins we have a defined area/window we want to look at for doppler information. Within that window we calculate “Weighted Doppler" which can be interpreted as a weighted average single number that quantifies the Doppler of the hand performing the gesture.

    For the twirl gesture, we actually divide the heat map into the + and - doppler regions and compute the two signatures above separately for pos (blue) and neg (red) doppler.

    Best,
    Amanda