remove unused function from pyrlk_optical_flow sample

samples/gpu/pyrlk_optical_flow.cpp

@@ -77,44 +77,6 @@ template <typename T> inline T mapValue(T x, T a, T b, T c, T d)
     return c + (d - c) * (x - a) / (b - a);
 }
 
-static void getFlowField(const Mat& u, const Mat& v, Mat& flowField)
-{
-    float maxDisplacement = 1.0f;
-
-    for (int i = 0; i < u.rows; ++i)
-    {
-        const float* ptr_u = u.ptr<float>(i);
-        const float* ptr_v = v.ptr<float>(i);
-
-        for (int j = 0; j < u.cols; ++j)
-        {
-            float d = max(fabsf(ptr_u[j]), fabsf(ptr_v[j]));
-
-            if (d > maxDisplacement)
-                maxDisplacement = d;
-        }
-    }
-
-    flowField.create(u.size(), CV_8UC4);
-
-    for (int i = 0; i < flowField.rows; ++i)
-    {
-        const float* ptr_u = u.ptr<float>(i);
-        const float* ptr_v = v.ptr<float>(i);
-
-
-        Vec4b* row = flowField.ptr<Vec4b>(i);
-
-        for (int j = 0; j < flowField.cols; ++j)
-        {
-            row[j][0] = 0;
-            row[j][1] = static_cast<unsigned char> (mapValue (-ptr_v[j], -maxDisplacement, maxDisplacement, 0.0f, 255.0f));
-            row[j][2] = static_cast<unsigned char> (mapValue ( ptr_u[j], -maxDisplacement, maxDisplacement, 0.0f, 255.0f));
-            row[j][3] = 255;
-        }
-    }
-}
-
 int main(int argc, const char* argv[])
 {
     const char* keys =