Improved filtering

src/main/java/com/elphel/imagej/tileprocessor/CLTPass3d.java

@@ -1148,6 +1148,9 @@ public class CLTPass3d{
 			}
 		}
 
+        public void setSecondMax(double [] second_max) { // setting "fake" for the non-measurement scan
+        	this.second_max = second_max;
+        }
         public void setSecondMax() {
         	this.second_max = getSecondMaxDiff(false);
         }

src/main/java/com/elphel/imagej/tileprocessor/TileProcessor.java

@@ -3912,11 +3912,12 @@ ImageDtt.startAndJoin(threads);
 	{
 		double [] disparity =     scan.getDisparity(use_final?0:1);
 		double [] disparityLMA =  scan.getDisparityLMA();
+		double [] second_max_bg = scan.getSecondMax();
 		if (!use_final) {
 			scan.setStrength(null);
 		}
 		double [] strength =     scan.getStrength();
-		return new double [][] {disparity, strength, disparityLMA}; 
+		return new double [][] {disparity, strength, disparityLMA,second_max_bg}; // second maximal difference between channels in BG 
 	}
 
 	// TODO: update for variable length

src/main/java/com/elphel/imagej/tileprocessor/TwoQuadCLT.java

@@ -80,6 +80,8 @@ public class TwoQuadCLT {
 	public static  int DSI_STRENGTH_MAIN =      6;
 	public static  int DSI_STRENGTH_AUX =       7;
 	public static  int DSI_STRENGTH_RIG =       8;
+	public static  int DSI_SPREAD_MAIN =        9;
+	public static  int DSI_SPREAD_AUX =        10;
 
 	public static String DSI_COMBO_SUFFIX = "-DSI_COMBO";
 	public static String DSI_MAIN_SUFFIX =  "-DSI_MAIN";
@@ -93,7 +95,9 @@ public class TwoQuadCLT {
 				"disparity_x3d",
 			    "strength_main",
 			    "strength_aux",
-			    "strength_rig"};
+			    "strength_rig",
+			    "spread_main",
+			    "spread_aux"};
 
 	public long                                            startTime;     // start of batch processing
 	public long                                            startSetTime;  // start of set processing