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2015-08-18 10:36:21 -0600 | answered a question | Can i get 2d world coordinates from a single image ([u,v] coords)? Thanks for the answer! Very helpuful. Sorry I took a long time to post how I solved my problem. I ended up using some of your equations and an additional one.
'R^T' is the transposed rotation matrix and 't' is tvec. Results where pretty accurate. I've changed some things since then and I don't remember the correct tolerance but it was better than I expected. I think a different lens might help to, mine has a fish eye distortion and even the 'undistort' function doesn't fix it completely. The edges are no good. Thanks again. |
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2015-07-24 13:23:08 -0600 | asked a question | Can i get 2d world coordinates from a single image ([u,v] coords)? I'm new to everything vision! I've read some similar posts but I can't get my head around it. Here's what I'm trying to do: -I have a single camera looking down on a surface (we can assume it's normal to the surface) and I want to detect a hole and obtain it's [X,Y] from a world coordinate I have determined. -I do not care about the -Z info, I know the real hole diameter. I have calibrated my camera and have the intrinsic matrix. For the extrinsic info I have taken 4 points from my image(mouse callback) and their correspondent 4-real points from the world coordinate to use 'solvePnP' and 'Rodrigues'(for the rotation matrix). I can detect the hole using HoughCircles and I have the center in [u,v] coords. Now, is there a way to obtain that [u,v] point in [X,Y] in my defined coordinate system??? |