arrlp.transform_parameters module

arrlp.transform_parameters(matrix, shape=None, *, shears=None, angle=None, scales=None, stacks=False)

Recover transform_matrix parameters from a 3x3 affine matrix.

One of shears, angle, or scales may be provided to make the inverse unique. If none is provided, shears=(0, 0) is assumed.

Parameters:

• matrix (np.ndarray) – 3x3 affine transformation matrix.

• shape (int, tuple, np.ndarray, optional) – Same convention as transform_matrix.

• shears (tuple, optional) – Known shears as (sheary, shearx).

• angle (float, optional) – Known rotation angle in degrees.

• scales (tuple, optional) – Known scales as (scaley, scalex).

Return type:

shiftx, shifty, shearx, sheary, angle, scalex, scaley