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+====== Standard Deviation-Based Correlation ======
+**A macro to determine image focal quality image-wide (not ROI-wide)**
+<code java>
+// A macro to determine image focal quality image-wide (not ROI-wide)
+// Based on algorithm F-13 "Standard Deviation-Based Correlation"
+// In: Sun et al., 2004. MICROSCOPY RESEARCH AND TECHNIQUE 65, 139–149.
+//
+// Version: 0.1
+// Date: 14/07/2006
+// Author: Andy Weller
+macro "Corr_Stddev" {
+run("Clear Results");
+run("Set Measurements...", "  mean redirect=None decimal=5");
+run("Measure");
+mean = getResult("Mean");
+selectWindow("Results");
+run("Close");
+W = getWidth();
+H = getHeight();
+b = H*W*(mean*mean);
+StddevCorr = 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+1,j);
+      t = p*p1;
+      StddevCorr += (p*p1)-b; // Maximum value is best-focused, decreasing as defocus increases
+      }
+   }
+print(StddevCorr); // This can also (should) be changed to return(StddevCorr)
+}
+</code>
+by Andy Weller — last modified 2006-07-14 20:37

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