reverted recent changes to edge-image

bbiwarg/Images/EdgeImage.cs

@@ -28,7 +28,7 @@ namespace bbiwarg.Images
             double interval = max[0] - min[0];
             dimg = dimg.Convert(delegate(byte d) {return (byte) ((d/interval)*255);});*/
             
-            Image = dimg.Canny(150, 100, 3);
+            Image = dimg.Canny(100, 75, 3);
 
             // draw blue edges in outputImage
             outputImage.Image[2] = Image.ThresholdBinary(new Gray(0), new Gray(1)).Mul(255);