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In this paper Mendel and Hsueh's [10] statevariable modeling technique for transforming a l-D non-causal system into a causal system is extended to 2-dimensional systems which have half-plane (HP) supports. The 2-D impulse responses treated here are restricted to a class in which their associated 2-0 z-trarisforms have separable denominators. The final state space model is a special type of socalled Roesser's model. It is a very low-order model, which is important from a computational point of view, when, for example, 2-0 recursive estimation algorithms are applied to 2-0 systems with HP supports.

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