diff --git a/src/core/transformations/convolution.cpp b/src/core/transformations/convolution.cpp
index a02b3b9..72be966 100644
--- a/src/core/transformations/convolution.cpp
+++ b/src/core/transformations/convolution.cpp
@@ -71,8 +71,11 @@ const math::matrix<float> Convolution::join(math::matrix<float> A, math::matrix<
 const float Convolution::sum(const math::matrix<float> A)
 {
     float sum = 0.0;
+    int size = A.rowno();
 
-    qDebug() << Q_FUNC_INFO << "Not implemented yet!";
+    for (int i = 0; i< size; i++)
+        for (int j = 0; j< size; j++)
+            sum = sum + A[i][j];
 
     return sum;
 
@@ -85,8 +88,8 @@ const math::matrix<float> Convolution::reflection(const math::matrix<float> A)
     int size = A.rowno();
     math::matrix<float> C(size, size);
 
-    for (int i=0; i < size; i++)
-        for (int j=0; j < size; j++)
+    for (int i = 0; i < size; i++)
+        for (int j = 0; j < size; j++)
             C[i][j] = A[size-i-1][size-j-1];
 
     return C;