How can I use vision to measure the distance of an object moving in video?

[Sky.George]

I don't understand vision software, how to identify objects in video, build coordinate systems and draw object coordinates How do I make a diagram of displacement versus time? Who can help me? Thank you very much!

[Hatef.fouladi]

based on you frame rate you can calculate time for example for 30fps you have 33 mili second time interval for any new image you can find you abject by one of matching or tracking method in any image of video in this case you have time based on fps rate and also abject position based on tracking or matching method and if you calibrate you image you can convert position to real world data
what I told you is simplified schematic of what you have to do

[Sky.George · Accepted solution]

Thanks for your help. How can I get the moving displacement of the center of mass of an image? Because I've just started learning LabVIEW, I don't know how to do it. Can you give me some examples of learning?

[Hatef.fouladi · Accepted solution]

as I told you before you have to use one of matching or tracking method for this one 
bellow image show some of them and also result of their action 
I think it is better to start to learn matching (color , pattern ,geometry or color pattern) with vision assistant software first and ifter that transfer your knowledge to labview  

[Sky.George · Accepted solution]

Thank you for your help.