Improved flat ground detection

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

@@ -6506,6 +6506,18 @@ public class OpticalFlow {
 			final double     max_abs_diff =     0.05;  // maximal absolute disparity difference from the plane 
 			final double     max_rel_diff =     0.1;   // maximal relative disparity difference from the plane
 			final double     normal_damping =   0.001; // pull to horizontal if not enough data
+			
+			final double     blur_frac  =       0.01; // 0.03
+			final double     weight_frac  =     0.3; // multiply weight by w=  1/(1 + (err/k_max_diff)^2)
+	     	final int        mtile_size  =     16;
+			final double     min_ev_rel  =      0.3;
+			final double     max_tilt  =        0.2;
+			final double     top_percent  =     0.5; // remove above 50% center intersection
+			final int        min_macro_tiles  = 3;
+			
+			
+			
+			
 			final boolean [] good_tiles = new boolean[ds[0].length];
 //			String     dbg_title =master_CLT.getImageName()+"-ground tilts"; 
 			String     dbg_title = "-ground_tilts"; 
@@ -6518,6 +6530,13 @@ public class OpticalFlow {
 					min_good1,             // final int        min_good1, // minimal good tiles after pass1
 					max_abs_diff,          // final double     max_abs_diff, // maximal absolute disparity difference from the plane 
 					max_rel_diff,          // final double     max_rel_diff, // maximal relative disparity difference from the plane
+					blur_frac,             // final double     blur_frac, //  = 0.01; // 0.03
+					weight_frac,           // final double     weight_frac, //  = 0.3; // multiply weight by w=  1/(1 + (err/k_max_diff)^2)
+			     	mtile_size,            // final int        mtile_size, //  =  16;
+					min_ev_rel,            // final double     min_ev_rel, //  =  0.3;
+					max_tilt,              // final double     max_tilt, //  =    0.2;
+					top_percent,           // final double     top_percent, //  = 0.5; // remove above 50% center intersection
+					min_macro_tiles,       // final int        min_macro_tiles, //  = 3;
 					normal_damping,        // final double     normal_damping,
 					master_CLT.getTilesX(),// final int        width,
 					good_tiles,            // final boolean [] good_tiles, // null or boolean[data.length] // should all be false