diff --git a/src/core/transformations/convolution.cpp b/src/core/transformations/convolution.cpp
index 84536ce..9c82e7e 100644
--- a/src/core/transformations/convolution.cpp
+++ b/src/core/transformations/convolution.cpp
@@ -60,7 +60,9 @@ const math::matrix<float> Convolution::join(math::matrix<float> A, math::matrix<
     int size = A.rowno();
     math::matrix<float> C(size, size);
 
-    qDebug() << Q_FUNC_INFO << "Not implemented yet!";
+    for (int i=0; i < size; i++)
+        for (int j=0; j < size; j++)
+           C[i][j] = A[i][j] * B[i][j];
 
     return C;
 }