integrated finger process pipeline on remapped 2d image

src/orisys/hhd/solvers/masked_sparse.py

@@ -0,0 +1,21 @@
+import numpy
+
+from ..domain import MaskedDomain
+
+
+class MaskedSparseSolver:
+    """Reference masked Poisson solver via factorized sparse Laplacian."""
+
+    def solve(self, f, domain: MaskedDomain):
+        """Solve masked Poisson on active domain pixels.
+
+        f: (H, W) scalar source field
+        domain: MaskedDomain with prebuilt Laplacian
+        returns: (H, W) scalar potential; zero outside mask
+        """
+        rhs = domain.prepare_rhs(f)
+        if rhs.size == 0:
+            return numpy.zeros_like(f, dtype=numpy.float32)
+
+        sol_active = domain.factor(rhs)  # (N,) reduced-system potential
+        return domain.scatter(sol_active, f)