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When dealing with rectified images, why would the inverse of a simple permutation matrix $$P = {\begin{bmatrix} 0 & -1 & 0 \\ 0 & 0 & -1 \\ 1 & 0 & 0 \end{bmatrix}}^{-1}$$ is sufficient to transform coordinate in camera frame to world frame, such that $X_w = P * X_c$ ?

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