Add SCIE-Lab error metric. Work in progress.

src/nvimage/CMakeLists.txt

@@ -7,6 +7,7 @@ SET(IMAGE_SRCS
     DirectDrawSurface.h DirectDrawSurface.cpp
     Filter.h Filter.cpp
     FloatImage.h FloatImage.cpp
+	ErrorMetric.h ErrorMetric.cpp
     Image.h Image.cpp
     ImageIO.h ImageIO.cpp
     NormalMap.h NormalMap.cpp

src/nvimage/Filter.cpp

@@ -265,6 +265,19 @@ void KaiserFilter::setParameters(float alpha, float stretch)
     this->stretch = stretch;
 }
 
+GaussianFilter::GaussianFilter(float w) : Filter(w) { setParameters(1); }
+
+float GaussianFilter::evaluate(float x) const
+{
+    // variance = sigma^2
+    return (1.0f / sqrtf(2 * PI * variance)) * expf(-x*x / (2 * variance));
+}
+
+void GaussianFilter::setParameters(float variance)
+{
+    this->variance = variance;
+}
+
 
 
 /// Ctor.

src/nvimage/Filter.h

@@ -116,6 +116,19 @@ namespace nv
         float stretch;
     };
 
+    // Gaussian filter.
+    class GaussianFilter : public Filter
+    {
+    public:
+        GaussianFilter(float w);
+        virtual float evaluate(float x) const;
+
+        void setParameters(float variance);
+
+    private:
+        float variance;
+    };
+
 
 
     /// A 1D kernel. Used to precompute filter weights.