comparison src/TuningDifference.cpp @ 69:c0b78dcc08e6 feature-alternatives tip

Some experimental feature adjustments - try using diffs between chroma cells (no better at first glance)

 }
 
 template<typename T>
 void addTo(vector<T> &a, const vector<T> &b)
 {
-    transform(a.begin(), a.end(), b.begin(), a.begin(), plus<T>());
+    int n = int(b.size());
+
+    for (int i = 0; i < n; ++i) {
+        int j = (i == 0 ? n-1 : i-1);
+        T diff = b[i] - b[j];
+        a[i] += diff;
+    }
 }
 
 template<typename T>
 T distance(const vector<T> &a, const vector<T> &b)
 {

 TuningDifference::computeFeatureFromTotals(const TFeature &totals) const
 {
     if (m_frameCount == 0) return totals;
     
     TFeature feature(m_bpo);
-    double sum = 0.0;
+    double max = 0.0;
 
     for (int i = 0; i < m_bpo; ++i) {
 	double value = totals[i] / m_frameCount;
-	feature[i] += value;
-	sum += value;
-    }
-
-    if (sum != 0.0) {
+	feature[i] = value;
+        if (fabs(value) > max) {
+            max = fabs(value);
+        }
+    }
+
+    if (max > 0.0) {
         for (int i = 0; i < m_bpo; ++i) {
-            feature[i] /= sum;
+            feature[i] /= max;
         }
     }
     
     return feature;
 }