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I am reading about homography in images and such. One thing pops up a lot:

$\mathbf{P} = [\mathbf{R}|\mathbf{t}]$

What does this mean?

Does this mean: If $\mathbf{R} = \begin{bmatrix}a & b\\\ c &d\end{bmatrix}$ and $ \mathbf{t} = \begin{bmatrix}x\\\ y\end{bmatrix}$, I get $ \mathbf{P} = \begin{bmatrix}a &b &x\\\ c& d& y\end{bmatrix}?$

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    Well, I only have access to the chapter posted on Zisserman's website.2011-07-22

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P denotes an augmented matrix (in this case a projection matrix) and your assumptions are correct about R and t.

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    Projection matrix is the matrix P such that: x = P X. Where X is your 3D point in homogeneous coordinates and x is your 2D point on the image plane.2011-07-21
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It called as the augmented matrix. Quite useful while solving linear equations. Please see: