2019-12-05 03:58:33 -0600 | commented question | How to ignore background within objects Maybe post a sample image to get a better idea of your plroblem. The example code assumes that background has been segme |
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2019-12-02 13:54:19 -0600 | asked a question | Why OpenCV uses Rodrigues rotation vector instead of Cayley's formula? Why OpenCV uses Rodrigues rotation vector instead of Cayley's formula? I was a fan of Rodrigues rotation formula [1] unt |
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2019-10-16 13:52:39 -0600 | marked best answer | Unclear how calibrateCamera estimates stdDeviations (perhaps wrong) Hi, I'm researching camera calibration and uncertainty propagation. I'm trying to understand how calibrateCameraExtended estimates stdDeviationsIntrinsics and stdDeviationsExtrinsics. The docs say very little. So I go straight to the source code. Check this lines of code where I understand the calculation is made.
It starts with And then it calculates each Where First question: what exactly is Second question: The moore-penrose of a 1xN matrix is a Nx1 matrix. So calling Third question: I couldn't make sense of the formula itself and I think It's wrong. The code has the comment But my understanding from simple uncertainty propagation for the case of uncorrelated parameters is that the Jacobian vector Which is ill-conditioned, the simplest solution would be Is my reasoning correct? and, where does the calculation implemented in OpenCV come from? |
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2019-10-16 13:52:32 -0600 | commented answer | Unclear how calibrateCamera estimates stdDeviations (perhaps wrong) Perfecto, thank you! I spent a long time trying to trace the meaning of JtJ and couldn't figure it out. Also I was confu |
2019-10-15 20:59:14 -0600 | asked a question | Unclear how calibrateCamera estimates stdDeviations (perhaps wrong) Unclear how calibrateCamera estimates stdDeviations (perhaps wrong) Hi, I'm researching camera calibration and uncertai |