what 's the meaning of tracking_points?

[anzisheng]

For a tracker.byte_tracker_3dcenter, I can see the tracking code is tracking_points = np.concatenate([(cams[:,[2,1]]+1)*image_scale, cam_trans[:,[2]]*depth_scale, cams[:,[0]]*image_scale/2],1) tracked_ids, results_inds = self.tracker.update(tracking_points, det_confs) the tracking_points is 4 float number. I want to konw the meaning of the 4 float numbers. Are the the coordernates of a bbox?

[Arthur151]

Hi,

The tracking points consist of four things:

1.The normalized x coordinate of body center (close to pelvis) on image plane; 2. The normalized y coordinate of body center (close to pelvis) on image plane; 3. The depth z of body center (close to pelvis) in our predefined camera space; 4. The scale s of a human on image plane.

Yes, we use the 3D body center for tracking.

2023年2月16日 11:05，anzisheng @.***> 写道：

For a tracker.byte_tracker_3dcenter, I can see the tracking code is tracking_points = np.concatenate([(cams[:,[2,1]]+1)*image_scale, cam_trans[:,[2]]*depth_scale, cams[:,[0]]*image_scale/2],1) tracked_ids, results_inds = self.tracker.update(tracking_points, det_confs) the tracking_points is 4 float number. I want to konw the meaning of the 4 float numbers. Are the the coordernates of a bbox?

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[anzisheng]

Hi, thanks for your reply. As you mentioned "use the 3D body center for tracking", I want to know how to track 3d body center which I get from multi camera?