Extracts intrinsic parameters from a calibration matrix.
tfg.rendering.camera.perspective.intrinsics_from_matrix(
matrix,
name=None
)
Defined in rendering/camera/perspective.py.
Extracts the focal length \((f_x, f_y)\) and the principal point \((c_x, c_y)\) from a camera calibration matrix
$$
\mathbf{C} =
\begin{bmatrix}
f_x & 0 & c_x \\
0 & f_y & c_y \\
0 & 0 & 1 \\
\end{bmatrix}.
$$
Note:
In the following, A1 to An are optional batch dimensions.
Args:
matrix: A tensor of shape[A1, ..., An, 3, 3], where the last two dimensions represent a camera calibration matrix.name: A name for this op that defaults to "perspective_intrinsics_from_matrix".
Returns:
Tuple of two tensors, each one of shape [A1, ..., An, 2]. The first
tensor represents the focal length, and the second one the principle point.
Raises:
ValueError: If the shape ofmatrixis not supported.