Index: cv.cpp
===================================================================
--- cv.cpp	(revisione 3428)
+++ cv.cpp	(copia locale)
@@ -1623,6 +1623,7 @@
       cvSetData(m->a, (void*)((char*)buffer + m->offset), m->a->step);
       assert(cvGetErrStatus() == 0);
       *dst = m->a;
+      Py_DECREF(o);
       return 1;
     } else {
       return failmsg("CvMat argument '%s' has no data", name);
@@ -1726,6 +1727,7 @@
     if (ao != NULL &&
         PyCObject_Check(ao) &&
         ((PyArrayInterface*)PyCObject_AsVoidPtr(ao))->two == 2) {
+      Py_DECREF(ao);
       return 1;
     }
   }
@@ -1734,7 +1736,7 @@
 }
 
 static int convert_to_cvarrseq(PyObject *o, cvarrseq *dst, const char *name = "no_name")
-{
+{ 
   if (PyType_IsSubtype(o->ob_type, &cvseq_Type)) {
     return convert_to_CvSeq(o, &(dst->seq), name);
   } else if (is_convertible_to_mat(o)) {
@@ -1749,7 +1751,7 @@
     // a sequence and that they are all the same size
     for (Py_ssize_t i = 0; i < PySequence_Fast_GET_SIZE(fi); i++) {
       PyObject *e = PySequence_Fast_GET_ITEM(fi, i);
-
+      
       if (!PySequence_Check(e))
         return failmsg("Sequence '%s' must contain sequences", name);
       if (i == 0)
@@ -2786,6 +2788,7 @@
 
 static PyObject *fromarray(PyObject *o, int allowND)
 {
+  
   PyObject *ao = PyObject_GetAttrString(o, "__array_struct__");
   if ((ao == NULL) || !PyCObject_Check(ao)) {
     PyErr_SetString(PyExc_TypeError, "object does not have array interface");
@@ -2796,7 +2799,7 @@
     PyErr_SetString(PyExc_TypeError, "object does not have array interface");
     return NULL;
   }
-
+  
   int type = -1;
 
   switch (pai->typekind) {
@@ -2847,6 +2850,7 @@
       return (PyObject*)failmsg("cv.fromarray array can be 2D or 3D only, see allowND argument");
     }
     m->a->data.ptr = (uchar*)pai->data;
+    Py_DECREF(ao);
     return pythonize_foreign_CvMat(m);
   } else {
     int dims[CV_MAX_DIM];