I am working on a high school project that is related to projectile motion. I am exploring how exactly the position of the center of mass affects the trajectory of a long but thin, javelin-like projectile. I have created a special launching machine that gives each projectile an identical impulse, filmed all flights on a high-fps camera and extracted the position of both tips over time, frame-by-frame using Tracker.

The flight distance is ~12m, and the camera's distance is ~10m from the flight path. Consequently, the image is sligtly distorted. It is not too significant but still it would be nice to be able to obtain precise data. I could fix it in Photoshop if it were just one frame but I really cannot proccess all my data this way. I have not found any free software that could fix videos but that would probably not be too useful anyway since I do not have sufficient computing power at my disposal to be able to complete the task in reasonable time. Also, I am only interested in the projectile and don't need the whole background to be fixed...

Therefore I probably need to find a way to find the correct coordinates using the coordinates I have already obtained. I know exactly what camera I used and so I could look up any specifications if necessary. Also, I know the dimensions of the place the videos were taken.

Could you please help me find the way to find (or compute, preferably) the correct coordinates or at least provide me with a link to a source where this is described? I am not sure I can diagnose what type of distortion I am dealing with which made googling even harder.

Thank you very much.

  • $\begingroup$ You can take the data from Tracker into Eurequa. $\endgroup$ – ja72 Feb 18 '13 at 14:27

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