photogrammetry

How can I determine distance from an object in a video?

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Your problem’s quite standard in the field. Firstly, you need to calibrate your camera. This can be done offline (makes life much simpler) or online through self-calibration. Calibrate it offline – please. Secondly, Once you have the calibration matrix of the camera K, determine the projection matrix of the camera in a successive scene (you … Read more

How do I reverse-project 2D points into 3D?

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[*] Alright, I came here looking for an answer and didn’t find something simple and straightforward, so I went ahead and did the dumb but effective (and relatively simple) thing: Monte Carlo optimisation. Very simply put, the algorithm is as follows: Randomly perturb your projection matrix until it projects your known 3D coordinates to your … Read more

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