2D-3D Transformation--------How to get the pixel's [X Y] coordinates,not the rows and columns?

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Yu Zhang 2013-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/68178-2d-3d-transformation-how-to-get-the-pixel-s-x-y-coordinates-not-the-rows-and-columns

回答： Jhesus Legarda 2016-6-17

Hi everyone,

I have a question about the coordinates transformation. I have calibrated my camera,and got the transform matrix. I'm confused by the pixel coordinates.

I used the rows and columns to do the 2D-3D transformation. But the result is not correct. I don't know whether the rows and columns work for the 2D-3D transformation. How can I get the [X Y] Coordinates of the pixels which I want to transfer into 3D coordinates.

I'm a beginner here. If anyone can help me figure it out, it would be VERY appreciated.

Thanks a lot!

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Matt J 2013-3-27

When you did the calibration, what 2D coordinate system did you use then? And what did the calibration process consist of? If you planned to use row/column coordinates, the calibration step should have used that coordinate system.

Yu Zhang 2013-3-28

http://i49.tinypic.com/2iu525v.jpg, http://i45.tinypic.com/2j462kj.jpg Links above are the results for the 2D-3D coordinates. All the point cloud are in the same plane. I used blob analysis--pixellist to get the 2D coordinates. But I don't know why all the points are on the same plane.

Thanks a lot!

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