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chaehyeonsong / discocal

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Explaining Calibrator::get_absolute_conic function #8

Open Mikhail2017 opened 2 months ago

Mikhail2017 commented 2 months ago

Hi. Could you provide any references for equations in this function? Unfortunately I didn't find it in your paper.

chaehyeonsong commented 2 months ago

We follow the paper "A flexible new technique for camera calibration". The reference number of this paper is [28]

Mikhail2017 commented 2 months ago

Do I understand it correctly, that equations in Calibrator::cal_initial_params are equal to Cholesky decomposition of B matrix?

chaehyeonsong commented 2 months ago

@Mikhail2017 . Yes. B matrix is the image of absolute conic. Positive-definite matrix has the unique Cholesky decomposition. the inverse of an intrinsic matrix is a lower triangle matrix; therefore, you can understand the process as an example of Cholesky decomposition.