tfg.rendering.camera.perspective.intrinsics_from_matrix

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Extracts intrinsic parameters from a calibration matrix.

tfg.rendering.camera.perspective.intrinsics_from_matrix(
    matrix: type_alias.TensorLike,
    name: str = 'perspective_intrinsics_from_matrix'
) -> Tuple[tf.Tensor, tf.Tensor, tf.Tensor]

Extracts the focal length $(f_x, f_y)$, the principal point $(c_x, c_y)$ and the skew_coefficient(\sc\) from a camera calibration matrix

$$\mathbf{C} = \begin{bmatrix} f_x & sc & c_x \\ 0 & f_y & c_y \\ 0 & 0 & 1 \\ \end{bmatrix}.$$

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 three tensors, the first two of shape [A1, ..., An, 2] and the third of shape [A1, ..., An, 1]. The first tensor represents the focal length, and the second one the principle point and the third one represents the skew coefficient.

Raises
ValueError	If the shape of matrix is not supported.