People tracking with combined line crossing

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    Andrew Sharrem

    Interesting scenario, but doable in specific circumstances.

    1. This would only work with 1 person in the ABC zone at any time.
    2. Each ABC event needs to be diguishable by nx, either by 3 cameras or a single camera where each linecross event is individually distinguished. For example;
      Although a Hikvision camera has multiple lincrossing feature, in Nx-Hik-Plugin all are treated as a line crossing event & no line #1,2,3 metadata is passed (from what I can tell).
      VCA camera does pass metadata that the Nx rule engine can distinguish {caption,description}. DW can likely do the same.

    Using the nx rules engine & Nx API, we create rules for each ABC event.
    A = enable B, enable C
    B = enable A, disable C
    C = sound alarm, enable A, disable B

    With this logic C will only alarm if B is not crossed after A ;-)

    Choosing a partner depends where in the world you are, but the products listed above can will direct you.
    This post somewhat explains how to enable / disable rules via API.
    https://support.networkoptix.com/hc/en-us/community/posts/17844491788695-Enable-Disable-Mobile-notification-rule-via-API-issue 

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    Jean-Mark Zipf

    Hello Andrew,
    thanks for your reply and good idea! I think it could definitely work with the rules engine from NX here.
    Unfortunately, however, your first condition is not met. There are numerous people in the area (approx. 10-20 people), so that each individual person must first be tagged by the system and then checked to see whether the specified rules are being adhered to by each person.
    I'm not sure which system or solution can be used to tag around 20 people at the same time and track whether they comply with the movement rules.

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    Andrew Sharrem

    Tough ask Jean-Mark.

    If the target becomes obscured, they would likley become a new target, and I'm thinking all you targets are wearing the same "safety" gear which makes id or re-identifing the target incredibly difficult.
    The Hailo chip is one of a few working with Re-id, and my friends @ AOL work with the Hailo chip.
    The logic would be something like each target acheives a "score" for each ABC.
    Converting the ABC to binary 101 (5) = fail, 111 (7) = pass.

    For your scenario, have you considered a "badging" technology using wristband fobs? Then use video verification on the exception report.

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    Jean-Mark Zipf

    Hi Andrew,
    the people are not obscured as they are detected from a bird's eye view. They are all wearing different clothes. I hope this helps.

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    Andrew Sharrem

    In that case, reach out to VCA or AOL.
    You should anticipate custom developement with some logic as defined above.
    For these situations I find it best to ballpark price the solution to the customer first before going very far.
    I would suggest $5-10k USD for the developement of the logic & notification / reporting is not unreasonable.

    Best of luck,
    Andrew

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    Jean-Mark Zipf

    Hi Andrew,
    great, many thanks for your help! I'll have a look at the solutions.

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