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if the plates are flat and you know the depth then you can use one camera at an angle. Measure the distance from the camera to the flat surface. The higher up the image the further away the object. Edge detection could detect the plate edges and the position in the image could be used to determine where it is.
Hello!your request;Is it possible to derive the shape of the profile and the 3d coordinates of the intersection, from a video?I had been thumbing through some tech papers, and ran across some options. The goal you seek may liein video forensics. (If this was CSI, we'd have the answer in an hour. Ha! )If this could be done (cheaply), people in this forum, like Kobratek, could use this to convertparts to dimensions in no time. Obviously, more information is needed, but maybe still on the righttrack.I had to provide an accurate scale of a part at work, and so, I put a grid in the background of the picture.This provided scale and angle perspective. In that context, if you had three cameras in an X, Y, and Z coordinate position from the target, that may be a starting point for your goal. If the cameras could be adjusted to focus on certain distances from their position, maybe this would give "layers"of perspective for target spacial definition.( ) Using sound as a depth gauge could be used. Also, maybe using lasers (only the camera can see) in different shaped may give depth perception. Consider this;If you used a laser that emitted a circle, that provided many ringed concentric projections( ring projectionsare set at a measured distance from each other), this could help provide depth perspective, and be invisibleto the user in infrared/ultraviolet lasers are used. Good luck!