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+====== Brenner Gradient ======
+**A macro to determine image focal quality image-wide (not ROI-wide)**
+<file java BrennerGradient.txt>
+// A macro to determine image focal quality image-wide (not ROI-wide)
+// Based on algorithm F-3 "Brenner Gradient"
+// In: Sun et al., 2004. MICROSCOPY RESEARCH AND TECHNIQUE 65, 139–149.
+//
+// Version: 0.1
+// Date: 14/07/2006
+// Author: Andy Weller
+macro "Brenner_Gradient" {
+W = getWidth();
+H = getHeight();
+brenner = 0; // Set to 0 which is out of focus
+for (j=0; j<H; j++) {
+   for (i=0; i<W; i++) {
+      p = getPixel(i,j);
+      p1 = getPixel(i+2,j);
+      brenner += (p1-p)*(p1-p); // Maximum value is best-focused, decreasing as defocus increases
+      }
+   }
+print(brenner); // This can also (should) be changed to return(brenner)
+}
+</file>
+by Andy Weller — last modified 2006-07-14 20:58

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