Webcam velocity of object

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Andrew Lewis
Andrew Lewis 2020-10-3
回答： Pankhuri Kasliwal 2020-10-6
Hello All,
I already have webcams set up. Are there any matlab functions that would be able to determine the speed of an object that is moving head on towards the camera? I was thinking of using the meters/pixel and having the camera track an image and how many pixels the image takes up to determine how far away it is. It is much work but I thought there would be some function already built into matlab to help this. Any suggestions are welcome.

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回答（1 个）

Pankhuri Kasliwal
Pankhuri Kasliwal 2020-10-6
Hi,
You can save the centroid results into a different variable at the end of every loop - 'centroids_old', and then compute the Euclidean distance between 'centroids_old' and 'centroids' for every row.
distCovered(k) = sqrt(sum((centroids(k,:)-centroids_old(k,:)).^2));
You will have to take care of boundary cases, where a track is lost (a row in centroids deleted) or a track is created (a row added in centroids).
Additionally, you can refer to the following links as well :
  1. https://in.mathworks.com/help/vision/tracking-and-motion-estimation.html
  2. https://in.mathworks.com/help/vision/ug/motion-based-multiple-object-tracking.html

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