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IWR6843: pplcount demo is not detecting the slow movement of the people ...

senthil kumark
Prodigy 190 points
Part Number: IWR6843

Hi,

We are using pplCount demo in the below folder.

C:\ti\mmwave_industrial_toolbox_3_6_2\labs\lab0015_pplcount_68xx

In the demo it is not finding the slow movement of the people. But once the people are detected then it is tracking even their breathing. If i want to detect even small movement of the object (In my case people with movement like the person standing in a queue and showing little movement like turning his head moving his hand) what config changes i should do?

I read the guide C:\ti\mmwave_industrial_toolbox_3_6_2\labs\lab0015_pplcount_68xx\pplcount_customization_guide.pdf and when i changed different parameters as mentioned in the document but it never improved the detection. Could any one have any suggestion?

Regards,

Senthilkumar K

  • 0
    TI__Mastermind 28055 points

    Hi Senthilkumar,

    The point cloud will typically detect small movements. However, these typically don't translate to tracker detections, as this would lead to many false detections. However, you could try the following in allocation parameters:

    1. Set the SNR threshold to 0
    2. Set the points threshold to a small value like 3
    3. Set the min velocity threshold to 0

    Regards,

    Justin

  • 0 in reply to Justin Curewitz
    Prodigy 190 points

    Hi Justin,

    Thanks for your feedback.

    Making velocity threshold to 0 gives better detection in the default config. Will it give any unwanted side effects?

    Some times we are getting some ghost detections and most of the time it will vanish in few seconds, but rarely we are seeing it is moving in parallel to the detected object and taking long time to vanish.

    In that period the detection count is not accurate. Do you have any solution for that too?

    Regards,

    Senthilkumar K

  • 0 in reply to senthil kumark
    TI__Mastermind 28055 points

    Hi Senthikumar,

    This sounds like a multipath reflection - is the false detection appearing behind a wall? If so, make sure to set the boundary parameters.

    Regards,

    Justin

  • 0
    Prodigy 190 points
    Hi Justin,

    It is not behind the wall and in the same configured scenery params.
    Yes, it seems to be a reflected signal. In my room when I go close to the wall (Brick) this issue is seen many times.
    But it has been following for a long time. Is there a way to eliminate it in the user application?

    Do you have any idea how many people can be tracked in a 6 x 6 meter area?

    Regards,
    Senthilkumar K


  • 0 in reply to senthil kumark
    TI__Mastermind 28055 points

    Hi Senthilkumar,

    How much have you tilted the sensor down? It should be around 15 degrees to avoid multipath from the ground. The reduced detection thresholds are most likely causing easy false detection.

    In a 6x6 room, I expect you will count 5 - 8 people with reasonable accuracy.

    regards,

    Justin