From the course: SynthEyes Essential Training (2015)

Photogrammetry - SynthEyes Tutorial

From the course: SynthEyes Essential Training (2015)

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Photogrammetry

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- Photogrammetry is the science of making measurements from photographs. By taking images from different angles, we can triangulate 3D position. As we can see in this example, when we have an image plane, which would be our footage, and we put a tracking marker to represent a feature, we are setting up a line of sight from the camera, through the image plane, to a point in 3D space. And as the image plane moves to a different angle, and we put our tracking marker on the same feature, we start to limit the choices of where that point can be in 3D space. And you can see what happens again as we move to another angle, and we do the same feature, and add another line of sight, we are locking that position and the possibilities of where that position can be, more and more. Now, if we use the same process but with multiple features, we'll be able to replicate the 3D scene even more accurately. And this is basically how 3D tracking software works. So keeping these concepts in mind while you start to do 3D tracking will help you in picking features in the scene to track. Now, let's look at an example. So, in this shot, if we were going to track the shot, and we put all of our trackers on this server, that wouldn't really help us much because they're all in the same plane and in one area. So what we want to do is evenly spread out the trackers at different depths, to help represent the 3D scene. So we'd want points way back here on these server doors, up in the front, even on this server, on the floor to represent the floor, on the sides, and at different depths. So, understanding these concepts will help you to understand what you need to track when beginning a match-move.

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