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IWR6843ISK: object id of point cloud at different frames

Kai Yang1
Expert 1400 points
Part Number: IWR6843ISK

Hi

Since the sensor gives an id to each detected point target, I was wondering if a specific object id, e.g., a point target with id 1, corresponds to the same point at different frames.

Thanks!

Kai 

  • Former Member
    0 Former Member

    Hello,

    What demo are you running? The standard out of box point cloud does NOT assign an ID to each point target. In the tracking based demo the tracked objects have IDs which identify the target from frame to frame for the lifetime of the tracked object in the scene. However the IDs can be recycled if the tracking stops and starts again. If target with ID 2 enters and walks around the scene and is tracked the entire time it is being tracked it's ID will be 2. If it leaves the scene and then a new target enters, the new target can be assigned ID 2 but it may or may not be the same object as the previous frame.

    Amanda

  • 0 in reply to Former Member
    Expert 1400 points

    Hi Amanda

    Thanks for your quick reply.

    I am running people counting demo. So, you are saying there is no ID for point cloud but there is an ID for each tracked object. Even for tracked object, we cannot just assume the same object ID corresponds to the same target from frame to frame, correct? Is so, is there a way to decide if a target is a new or old one.

    Thanks!

    Kai

  • Former Member
    0 Former Member in reply to Kai Yang1

    Kai - that is correct. As explained above there is no distinction between an old or new one. The sensor cannot know what happens outside it's FOV so it is not possible to know whether a reentering track is new or old.

  • 0 in reply to Former Member
    Expert 1400 points

    Thanks, Amanda.