From 08179e6daab59c0637f82ca39e80e914279133e0 Mon Sep 17 00:00:00 2001
From: Jordan Cheney <jordan.cheney@gmail.com>
Date: Fri, 22 May 2015 13:39:36 -0400
Subject: [PATCH] Progress towards NPD

---
 openbr/plugins/representation/npd.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+), 0 deletions(-)

diff --git a/openbr/plugins/representation/npd.cpp b/openbr/plugins/representation/npd.cpp
index 0c1a9f9..30f1c5e 100644
--- a/openbr/plugins/representation/npd.cpp
+++ b/openbr/plugins/representation/npd.cpp
@@ -26,6 +26,16 @@ class NPDRepresentation : public Representation
         return features[idx].calc(image);
     }
 
+    Mat evaluate(const Mat &image, const QList<int> &indices) const
+    {
+        int size = indices.empty() ? numFeatures() : indices.size();
+
+        Mat result(1, size, CV_32FC1);
+        for (int i = 0; i < size; i++)
+            result.at<float>(i) = evaluate(image, indices.empty() ? i : indices[i]);
+        return result;
+    }
+
     Size windowSize(int *dx, int *dy) const
     {
         if (dx && dy)
@@ -33,6 +43,9 @@ class NPDRepresentation : public Representation
         return Size(winWidth, winHeight);
     }
 
+    int numFeatures() const { return features.size(); }
+    int maxCatCount() const { return 0; }
+
     struct Feature
     {
         Feature() {}
@@ -46,6 +59,13 @@ class NPDRepresentation : public Representation
 
 BR_REGISTER(Representation, NPDRepresentation)
 
+inline float NPDRepresentation::Feature::calc(const Mat &image) const
+{
+    const int *ptr = image.ptr<int>();
+    int v1 = ptr[p[0]], v2 = ptr[p[1]];
+    return v1 == 0 && v2 == 0 ? 0 : ((float)(v1 - v2)) / (v1 + v2);
+}
+
 } // namespace br
 
 #include "representation/npd.moc"
--
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