Is there any(otbcli) way of applying a 6-parameters affine transformation?

otbcli_RigidTransformResample allows for including sx, sy, angle, dx, dy
thus in principle I should be able to apply:

X' = sx X cos(alpha) - sy Y sin(alpha) + xo
Y' = sx X sin(alpha) +  sy Y cos(alpha) + yo

but my fit from homologous points results on:
X' = aX - bY + xo
Y' = cX + dY + yo

so I would need either
1. An otbcli accepting the 6 parameters
2. A way to find sx, sy and angle alpha  from a, b, c and d.

Any help appreciated,

Agus

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