Make imageStats virtual method so it can be called from abstract class

rawimage.h

@@ -9,6 +9,8 @@
 
 class RawImageAbs
 {
+public:
+    virtual bool imageStats(uint64_t *mean, double *stdDev, uint64_t *median, uint64_t *min, uint64_t *max) const = 0;
 };
 
 template<typename T>
@@ -59,8 +61,8 @@ public:
         m_width = w;
         m_height = h;
         img.resize(w*h);
-        img.clear();
         m_img = std::move(img);
+        img.clear();
     }
     T* data()
     {
@@ -70,14 +72,14 @@ public:
     {
         return m_img;
     }
-    bool imageStats(T *mean, double *stdDev, T *median, T *min, T *max) const
+    bool imageStats(uint64_t *mean, double *stdDev, uint64_t *median, uint64_t *min, uint64_t *max) const
     {
         if(m_img.size()==0)return false;
 
         uint64_t sum = 0;
         uint64_t sqrSum = 0;
-        T tMin = UINT64_MAX;
-        T tMax = 0;
+        uint64_t tMin = UINT64_MAX;
+        uint64_t tMax = 0;
 
         for(T i : m_img)
         {