From b95007be95bd05a44cfaf9dda9d7ea9253c56378 Mon Sep 17 00:00:00 2001 From: Thomas FORGIONE Date: Wed, 11 Mar 2015 17:52:23 +0100 Subject: [PATCH] added calibration in the report --- report/subsections/calibration.tex | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/report/subsections/calibration.tex b/report/subsections/calibration.tex index 4ae4fbb..60b8a8d 100644 --- a/report/subsections/calibration.tex +++ b/report/subsections/calibration.tex @@ -1 +1,28 @@ -\subsection{Camera calibration} \ No newline at end of file +% Here we go +\subsection{Camera calibration} + The camera calibration is needed for the client during the reconstruction + of the 3D skeleton. The calibration consists in two steps : + + \begin{enumerate} + \item the \textbf{internal calibration} which is the estimation of the + instrinsic parameters of the camera (such as the focal length, or the + principal point) + + \item the \textbf{external calibration} which is the estimation of the + extrinsic parameters (the position of the camera from the chessboard) + \end{enumerate} + + \subsubsection{Internal calibration} + The internal calibration is based on a program that we completed during + a lesson last semester. By detecting chessboards in numerous positions + of the camera, we are able to estimate the intrinsic parameters. This + programs use as input a video of a chessboard where the position of + camera changes, and it captures some frames where the chessboard is + detected. With these pictures, we estimate the intrinsic parameters. + + \subsubsection{External calibration} + For the external calibration, we wrote a program that uses an + estimation of the homography to compute the extrinsical parameters of + the camera. One should note that what we call the \emph{extrinsical + parameters} are the ones that convert points from the reference of the + chessboard to the reference of the camera.