with b given by (229). The MAP estimate f must satisfy the equation = 0.
Therefore, from (239) we get the following nonlinear equation for the
estimate
*
[C
x/
] -
1
({ - (J - [SJ'[S
6
][C„] - '(g - s([§]f)) = 0 (241)
where the partial derivatives in the matrix [<S
b
] must now be calculated at
&
= [§]f.
Because of the large dimensionality of the problem, for most images of
practical interest a direct solution of (241) is computationally almost im-
possible. However, when [§] i
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