Fixed getConfodence return type in ImageData.

bbiwarg/DataSource/ImageData.cs

@@ -39,7 +39,7 @@ namespace bbiwarg.DataSource
             return depthImage.getDepth(x, y);
         }
 
-        public float getConfidence(int x, int y)
+        public short getConfidence(int x, int y)
         {
             return confidenceImage.getConfidence(x, y);
         }