Adding temperature to sky discrimination

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

@@ -35,7 +35,8 @@ public class CLTPass3d{
 		private  double [][]    disparity_sav; // saved disparity
 		private  int    [][]    tile_op_sav;   // saved tile_op
 		public   double [][]    disparity_map =            null; // add 4 layers - worst difference for the port
-		public   double []      second_max = null;
+		public   double []      second_max =               null; // second maximal difference between channels
+		public   double []      avg_val =                  null; // average pixel value for all channels (for cold sky)
 		public   double [][]    lazy_eye_data =            null;
 		public   int            lma_cluster_size =         -1;
 		public   boolean []     lazy_eye_force_disparity = null;
@@ -326,6 +327,16 @@ public class CLTPass3d{
 			return these_diffs;
 		}
 		
+		public double [][] getRBGs (){
+			if (disparity_map == null) return null;
+			int numcol = tileProcessor.isMonochrome()? 1: 3;
+			double  [][] these_RBGs =    new double[numcol*getNumSensors()][];
+			for (int i = 0; i< these_RBGs.length; i++) these_RBGs[i] = disparity_map[ImageDtt.getImgToneRGB(getNumSensors()) + i]; // IMG_DIFF0_INDEX does not depend on num sensors
+			return these_RBGs;
+		}
+		
+	//getImgToneRGB() 	
+
 		public void resetCalc(){ // only needed if the same task was reused
 			calc_disparity = null;
 			strength =       null;
@@ -751,7 +762,6 @@ public class CLTPass3d{
 		public void resetByDiff(
 				double max_diff,
 				double mismatch_override) {
-			setSecondMax();
 			if ((disparity_map == null) ||(disparity_map[ImageDtt.DISPARITY_STRENGTH_INDEX] == null)) {
 				System.out.println("resetByDiff(): strength is null! (no tiles left)");
 				return;
@@ -1161,6 +1171,62 @@ public class CLTPass3d{
         	return this.second_max;
         }
 		
+        public void setAvgVal(double [] avg_val) { // setting "fake" for the non-measurement scan
+        	this.avg_val = avg_val;
+        }
+        public void setAvgVal() {
+        	this.avg_val = getLowResChn();
+        }
+        public double [] getAvgVal() {
+        	if (this.avg_val == null) {
+        		setAvgVal();
+        	}
+        	return this.avg_val;
+        }
+        
+        
+        
+		public double [] getLowResChn ()
+		{
+			final int numcolors = tileProcessor.isMonochrome()?1:3;
+			final double [][] rbg = getRBGs();
+			if (rbg == null) return null;
+			for (int i = 0; i < rbg.length; i++) {
+				if (rbg[i] == null) return null;
+			}
+			final double [] col_weights = {0.25,0.25,0.5};
+			final int tilesX = tileProcessor.getTilesX();
+			final int tilesY = tileProcessor.getTilesY();
+			final int num_tiles = tilesX * tilesY;
+			final double [] lowres = new double [num_tiles];
+			final boolean [] measured =  measuredTiles ();
+			final Thread[] threads = ImageDtt.newThreadArray(tileProcessor.threadsMax);
+			final AtomicInteger ai = new AtomicInteger(0);
+			for (int ithread = 0; ithread < threads.length; ithread++) {
+				threads[ithread] = new Thread() {
+					@Override
+					public void run() {
+						for (int nTile = ai.getAndIncrement(); nTile < num_tiles; nTile = ai.getAndIncrement()) {
+							double d = 0.0;
+							if (numcolors == 1) {
+								for (int i = 0; i < rbg.length; i++) {
+									d += rbg[i][nTile];
+								}
+							} else {
+								for (int i = 0; i < rbg.length; i++) {
+									int col= i%numcolors;
+									d += rbg[i][nTile]*col_weights[col];
+								}
+							}
+							lowres[nTile] = d/getNumSensors();
+						}
+					}
+				};
+			}
+			ImageDtt.startAndJoin(threads);
+			return lowres;
+		}        
+        
 		public double [] getSecondMaxDiff (
 				final boolean averaged)
 		{
@@ -1222,6 +1288,9 @@ public class CLTPass3d{
 			ImageDtt.startAndJoin(threads);
 			return second_max_averaged;
 		}
+		
+		
+		
 		@Deprecated
 		public double [] getFOM(
 				double w_adisp,

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

@@ -71,7 +71,7 @@ import ij.plugin.filter.GaussianBlur;
 
 public class OpticalFlow {
 	public static String [] COMBO_DSN_TITLES = {"disp", "strength","disp_lma","num_valid","change",
-			"disp_bg", "strength_bg","disp_lma_bg","change_bg","disp_fg","disp_bg_all"};
+			"disp_bg", "strength_bg","disp_lma_bg","change_bg","disp_fg","disp_bg_all","blue_sky"};
 	public static int COMBO_DSN_INDX_DISP =        0; // cumulative disparity (from CM or POLY), FG
 	public static int COMBO_DSN_INDX_STRENGTH =    1; // strength, FG
 	public static int COMBO_DSN_INDX_LMA =         2; // masked copy from 0 - cumulative disparity
@@ -83,8 +83,7 @@ public class OpticalFlow {
 	public static int COMBO_DSN_INDX_CHANGE_BG =   8; // increment, BG
 	public static int COMBO_DSN_INDX_DISP_FG =     9; // cumulative disparity (from CM or POLY), FG
 	public static int COMBO_DSN_INDX_DISP_BG_ALL =10; // cumulative BG disparity (Use FG where no BG is available)
-
-	
+	public static int COMBO_DSN_INDX_BLUE_SKY =   11; // Detected featureless infinity (sky)
 	
 	public static double [] ZERO3 = {0.0,0.0,0.0};
 	public static double  LINE_ERR = 0.1;
@@ -4133,10 +4132,10 @@ public class OpticalFlow {
 		final int        debugLevelInner=clt_parameters.batch_run? -2: debugLevel; // copied from TQ
 		
 		double  min_ref_str =        clt_parameters.imp.min_ref_str;
-		
 		double sky_seed =         7.0;  // start with product of strength by diff_second below this
 		double sky_lim =         15.0; // then expand to product of strength by diff_second below this
-		int    sky_shrink =       4;
+		double lma_seed=          2.0;  // seed - disparity_lma limit		double sky_lim  =      15.0; // then expand to product of strength by diff_second below this
+		int    sky_shrink =       6;
 		int    sky_expand_extra = 0; // 1?
 		
 		boolean [] ref_blue_sky = null; // turn off "lma" in the ML output  
@@ -4198,7 +4197,7 @@ public class OpticalFlow {
 		}
 		
 		// 1. Reference scene DSI
-		while (quadCLTs[ref_index].getBlueSky() == null) {
+		while ((quadCLTs[ref_index] == null) || (quadCLTs[ref_index].getBlueSky() == null)) { // null
 			if (build_ref_dsi) {
 				TwoQuadCLT.copyJP4src( // actually there is no sense to process multiple image sets. Combine with other
 						// processing?
@@ -4232,6 +4231,7 @@ public class OpticalFlow {
 				dsi[TwoQuadCLT.DSI_STRENGTH_AUX] =      aux_last_scan[1];
 				dsi[TwoQuadCLT.DSI_DISPARITY_AUX_LMA] = aux_last_scan[2];
 				dsi[TwoQuadCLT.DSI_SPREAD_AUX] =        aux_last_scan[3];
+				dsi[TwoQuadCLT.DSI_AVGVAL_AUX] =        aux_last_scan[4];
 
 				if (quadCLT_main.correctionsParameters.clt_batch_dsi_cm_strength) {
 					CLTPass3d scan = new CLTPass3d(quadCLTs[ref_index].tp);
@@ -4258,16 +4258,24 @@ public class OpticalFlow {
 				} else {
 					dsi[TwoQuadCLT.DSI_STRENGTH_AUX] =      aux_last_scan[1];
 				}
-				int tilesX = quadCLTs[ref_index].getTileProcessor().getTilesX();
+//				int tilesX = quadCLTs[ref_index].getTileProcessor().getTilesX();
+				boolean retry=false;
+				while (true) {
 					quadCLTs[ref_index].setBlueSky  (
 							sky_seed,           // double sky_seed, //  =       7.0;  // start with product of strength by diff_second below this
+							lma_seed,
 							sky_lim,            // double sky_lim, //   =      15.0; // then expand to product of strength by diff_second below this
 							sky_shrink,         // int    sky_shrink, //  =       4;
 							sky_expand_extra,   // int    sky_expand_extra, //  = 100; // 1?
 							dsi[TwoQuadCLT.DSI_STRENGTH_AUX], // double [] strength,
 							dsi[TwoQuadCLT.DSI_SPREAD_AUX], // double [] spread,
-						debugLevel);        // int debugLevel)
-
+							dsi[TwoQuadCLT.DSI_DISPARITY_AUX_LMA], // double [] spread,
+							dsi[TwoQuadCLT.DSI_AVGVAL_AUX],//	double [] avg_val,
+							batch_mode? -1: 1); /// debugLevel);        // int debugLevel)
+					if (!retry) {
+						break;
+					}
+				}
 				quadCLTs[ref_index].saveDSIAll (
 						"-DSI_MAIN", // String suffix, // "-DSI_MAIN"
 						dsi);
@@ -4299,11 +4307,14 @@ public class OpticalFlow {
 				} else {
 					quadCLTs[ref_index].setBlueSky  (
 							sky_seed,                              // double sky_seed, //  =       7.0;  // start with product of strength by diff_second below this
+							lma_seed,                              //          2.0;  // seed - disparity_lma limit
 							sky_lim,                               // double sky_lim, //   =      15.0; // then expand to product of strength by diff_second below this
 							sky_shrink,                            // int    sky_shrink, //  =       4;
 							sky_expand_extra,                      // int    sky_expand_extra, //  = 100; // 1?
 							dsi[TwoQuadCLT.DSI_STRENGTH_AUX],      // double [] strength,
 							dsi[TwoQuadCLT.DSI_SPREAD_AUX],        // double [] spread,
+							dsi[TwoQuadCLT.DSI_DISPARITY_AUX_LMA], //double [] disp_lma,
+							dsi[TwoQuadCLT.DSI_AVGVAL_AUX],//	double [] avg_val,
 							debugLevel);        // int debugLevel)
 				}
 			}
@@ -4349,7 +4360,7 @@ public class OpticalFlow {
 						debugLevel-2);
 			} // split cycles to remove output clutter
 			int debug_scene = -15;
-			boolean debug2 = true;
+			boolean debug2 = false; // true;
 			boolean [] reliable_ref = null;
 			if (min_ref_str > 0.0) {
 				reliable_ref = quadCLTs[ref_index].getReliableTiles( // will be null if does not exist.
@@ -4556,6 +4567,9 @@ public class OpticalFlow {
 		}
 
 		if (photo_en && !reuse_video) {
+			if (debugLevel > -3) {
+				System.out.println("**** Running photometric equalization *****");
+			}
 			if (combo_dsn_final == null) { // always re-read?
 				combo_dsn_final =quadCLTs[ref_index].readDoubleArrayFromModelDirectory( // always re-read?
 						"-INTER-INTRA-LMA", // String      suffix,
@@ -7558,7 +7572,8 @@ public class OpticalFlow {
 		double [] target_disparity_orig = target_disparity.clone(); // will just use NaN/not NaN to restore tasks before second pass with LMA
 //		double [][] combo_dsn_final = new double [combo_dsn_titles.length][combo_dsn[0].length];
 		double [][] combo_dsn_final = 
-				new double [(clt_parameters.rig.mll_max_refines_bg > 0)? combo_dsn_titles_full.length:combo_dsn_titles.length][combo_dsn[0].length];
+				new double [(clt_parameters.rig.mll_max_refines_bg > 0)?
+						combo_dsn_titles_full.length:combo_dsn_titles.length][combo_dsn[0].length];
 		combo_dsn_final[COMBO_DSN_INDX_DISP]= combo_dsn[COMBO_DSN_INDX_DISP].clone();
 		for (int i = 1; i < combo_dsn_final.length; i++) {
 			Arrays.fill(combo_dsn_final[i], Double.NaN);
@@ -7766,6 +7781,17 @@ public class OpticalFlow {
 				}
 			}
 		}
+		// add blue sky slice
+		boolean [] blue_sky = ref_scene.getBlueSky();
+		double  [] payload_blue_sky = combo_dsn_final[combo_dsn_final.length-1]; // last slice, length by titles
+		Arrays.fill(payload_blue_sky,Double.NaN);
+		if (blue_sky != null) {
+			for (int i = 0; i < tiles; i++) {
+				payload_blue_sky[i] = blue_sky[i] ? 1.0 : 0.0;
+			}
+		}
+		
+		
 		
 		// restore modified parameters
 		clt_parameters.img_dtt.bimax_combine_mode = save_bimax_combine_mode;
@@ -8169,15 +8195,26 @@ public class OpticalFlow {
 		final int tilesY = ref_scene.getTileProcessor().getTilesY();
 		final int tiles = tilesX * tilesY;
 
+		// COMBO_DSN_TITLES
+		// fix for old files
+		if (combo_dsn_final.length < COMBO_DSN_TITLES.length) {
+			System.out.println("=== Old data format, rebuilding blue sky ===");
+			double[][] combo_dsn_final_was = combo_dsn_final;
+			combo_dsn_final = new double[COMBO_DSN_TITLES.length][]; 
+			for (int i = 0; i < combo_dsn_final_was.length; i++) {
+				combo_dsn_final[i] = combo_dsn_final_was[i];
+			}
+			for (int i = combo_dsn_final_was.length; i < combo_dsn_final.length; i++) {
+				combo_dsn_final[i] = new double[tiles];
+				Arrays.fill(combo_dsn_final[i],Double.NaN);
+			}
 			boolean [] blue_sky = ref_scene.getBlueSky();
-		double  [] payload_blue_sky = new double[tiles];
-		Arrays.fill(payload_blue_sky,Double.NaN);
 			if (blue_sky != null) {
 				for (int i = 0; i < tiles; i++) {
-				payload_blue_sky[i] = blue_sky[i] ? 1.0 : 0.0;
+					combo_dsn_final[COMBO_DSN_INDX_BLUE_SKY][i] = blue_sky[i] ? 1.0 : 0.0;
+				}
 			}
 		}
-		
 		double  fat_zero_single = clt_parameters.getGpuFatZero(ref_scene.isMonochrome()); // for single scene
 		ImageDtt image_dtt;
 		image_dtt = new ImageDtt(
@@ -8252,7 +8289,7 @@ public class OpticalFlow {
 					combo_dsn_final[COMBO_DSN_INDX_CHANGE_BG],  // increment, BG
 					combo_dsn_final[COMBO_DSN_INDX_DISP_FG],    //cumulative disparity (from CM or POLY), FG == COMBO_DSN_INDX_DISP
 					combo_dsn_final[COMBO_DSN_INDX_DISP_BG_ALL],// cumulative BG disparity (Use FG where no BG is available)
-					payload_blue_sky                            // detected featureless sky - 1.0, reliable - 0.0, no data - NaN
+					combo_dsn_final[COMBO_DSN_INDX_BLUE_SKY]    // detected featureless sky - 1.0, reliable - 0.0, no data - NaN
 					
 			};
 			for (int i = 0; i < payload.length; i++) {
@@ -8382,7 +8419,7 @@ public class OpticalFlow {
 					combo_dsn_final[COMBO_DSN_INDX_CHANGE_BG],  // increment, BG
 					combo_dsn_final[COMBO_DSN_INDX_DISP_FG],    // cumulative disparity (from CM or POLY), FG == COMBO_DSN_INDX_DISP
 					combo_dsn_final[COMBO_DSN_INDX_DISP_BG_ALL],// cumulative BG disparity (Use FG where no BG is available)
-					payload_blue_sky                            // detected featureless sky - 1.0, reliable - 0.0, no data - NaN
+					combo_dsn_final[COMBO_DSN_INDX_BLUE_SKY]    // detected featureless sky - 1.0, reliable - 0.0, no data - NaN
 			};
 			for (int i = 0; i < payload.length; i++) {
 				add_tile_meta(

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

@@ -422,6 +422,7 @@ public class QuadCLTCPU {
 	 * and so on. 
 	 *  
 	 * @param sky_seed minimal value of strength*spread to seed sky areas 
+	 * @param disparity_seed maximal disparity to seed sky areas (not needed for expand) 
 	 * @param sky_lim maximal value of strength*spread over which sky area will
 	 *                        be expanded
 	 * @param sky_shrink shrink initial sky area to eliminate small non-sky areas. 
@@ -431,31 +432,138 @@ public class QuadCLTCPU {
 	 * @param spread 1d array of tile spreads (second maximal difference from
 	 *                  of per-sensor pixel values in a tile to their average
 	 *                  in scanline order. 
+	 * @param disparity 1d array of tile disparity in scanline order
 	 * @param debugLevel debug level
 	 * @return boolean 1d array of the pixels belonging to the blue sky.
 	 */
 	public static boolean [] getBlueSky  (
 			double sky_seed, //  =       7.0;  // start with product of strength by diff_second below this
+			double disparity_seed, //          2.0;  // seed - disparity_lma limit
 			double sky_lim, //   =      15.0; // then expand to product of strength by diff_second below this
 			int    sky_shrink, //  =       4;
 			int    sky_expand_extra, //  = 100; // 1?
 			int    width,
 			double [] strength,
 			double [] spread,
+			double [] disparity,
+			double [] avg_val,
 			int debugLevel) {
 		if ((strength == null) || (spread==null)) {
 			return null;
 		}
+		double [] temp_scales = null;
+		double cold_scale =    0.2;  // <=1.0. 1.0 - disables temperature dependence
+		double cold_frac =     0.005; // this and lower will scale fom by  cold_scale
+		double hot_frac =      0.9;    // this and above will scale fom by 1.0
+		double min_strength =  0.08;
+		int    seed_rows =     5; // sky should appear in this top rows 
+		
+		
+		int num_bins = 1000;
+		if (avg_val != null) {
+			double min_temp = Double.NaN, max_temp=Double.NaN, avg_temp = 0;
+			int num_def = 0;
+			for (int i = 0; i < avg_val.length; i++) {
+				double d = avg_val[i];
+				if (!Double.isNaN(d)) {
+					if (!(d <= max_temp)) max_temp = d;
+					if (!(d >= min_temp)) min_temp = d;
+					avg_temp += d;
+					num_def++;
+				}
+			}
+			if (num_def > 00) {
+				avg_temp/= num_def;
+				// build a histogram from min to max
+				double [] hist = new double [num_bins];
+				double kbin = num_bins/(max_temp - min_temp);
+				int maxbin = num_bins - 1;
+				double s = 1.0/num_def;
+				for (int i = 0; i < avg_val.length; i++) {
+					double d = avg_val[i];
+					if (!Double.isNaN(d)) {
+						int ibin = (int) Math.floor((d - min_temp) * kbin);
+						if (ibin <0) ibin = 0;
+						else if (ibin > maxbin) {
+							ibin = maxbin;
+						}
+						hist[ibin] += s;
+					}
+				}
+				for (int i = 1; i < num_bins; i++) { // make cumulative, last is 1.0;
+					hist[i] += hist[i-1];
+				}
+				double temp_cold = min_temp;
+				double temp_hot =  max_temp;
+				for (int i = 0; i < num_bins; i++) {
+					if (hist[i] > cold_frac) {
+						double d = hist[i];
+						double d_prev = (i > 0)? hist[ i-1 ]: 0.0;
+						double b_cold = (cold_frac-d_prev)/(d-d_prev) + i;
+						temp_cold = min_temp + b_cold* (max_temp - min_temp) / num_bins;
+						break;
+					}
+				}
+				for (int i = num_bins - 2; i >= 0; i--) {
+					if (hist[i] <= hot_frac) {
+						double d =      hist[i];
+						double d_next = hist[i+1];
+						double b_hot = (hot_frac - d)/(d_next - d) + i;
+						temp_hot = min_temp + b_hot* (max_temp - min_temp) / num_bins;
+						break;
+					}
+				}
+				temp_scales = new double[avg_val.length];
+				Arrays.fill(temp_scales, Double.NaN);
+				double kscale = (1.0 - cold_scale)/(temp_hot - temp_cold);
+				for (int i = 0; i < avg_val.length; i++) {
+					double d = avg_val[i];
+					if (!Double.isNaN(d)) {
+						if (d < temp_cold) {
+							temp_scales[i] = cold_scale;
+						} else if (d > temp_hot) {
+							temp_scales[i] = 1.0;
+						} else {
+							temp_scales[i] = cold_scale + (d - temp_cold) * kscale;
+						}
+					}
+				}
+			}
+		}
+		
+		
+		String [] dbg_in_titles =    {"fom", "strength", "spread", "disparity", "avg_val", "tscale"};
 		String [] dbg_titles = {"sky", "seed", "max", "shrank"};
+		
+		if (debugLevel>0) {
+			double [] fom = new double[strength.length];
+			for (int i = 0; i < fom.length; i++) {
+				fom[i] =  Math.max(strength[i], min_strength) * spread[i] * temp_scales[i];
+			}
+			(new ShowDoubleFloatArrays()).showArrays(
+					new double[][] {fom, strength, spread, disparity, avg_val, temp_scales},
+					width,
+					fom.length/width,
+					true,
+					"sky_input",
+					dbg_in_titles); //	dsrbg_titles);
+
+		}
 		double [][] dbg_img = (debugLevel>0) ? new double [dbg_titles.length][strength.length]:null;
 		
 		boolean [] sky_tiles =      new  boolean [strength.length];
 		boolean [] prohibit_tiles = new  boolean [strength.length];
 		for (int i = 0; i < sky_tiles.length; i++) {
-			double d = strength[i] * spread[i];
-			sky_tiles[i] =      (d < sky_seed);
+			double d = Math.max(strength[i], min_strength) * spread[i];
+			if (temp_scales != null) {
+				d *=temp_scales[i];
+			}
 			prohibit_tiles[i] = (d >= sky_lim);
+			int row = i/width;
+//			sky_tiles[i] =    (row < seed_rows) &&  (d < sky_seed) && !(disparity[i] > disparity_seed);
+			sky_tiles[i] = (d < sky_seed) && !(disparity[i] > disparity_seed);
 		}
+		//seed_rows
 		if (dbg_img != null) {
 			for (int i = 0; i < sky_tiles.length; i++) {
 				dbg_img[1][i] = sky_tiles[i]? 1 : 0;
@@ -467,6 +575,9 @@ public class QuadCLTCPU {
 				sky_shrink,    // int        shrink,           // grow tile selection by 1 over non-background tiles 1: 4 directions, 2 - 8 directions, 3 - 8 by 1, 4 by 1 more
 				sky_tiles,     // boolean [] tiles,
 				null);         // boolean [] prohibit)
+		if (seed_rows > 0) {
+			Arrays.fill(sky_tiles, seed_rows * width, sky_tiles.length, false);
+		}
 		if (dbg_img != null) {
 			for (int i = 0; i < sky_tiles.length; i++) {
 				dbg_img[3][i] = sky_tiles[i]? 1 : 0;
@@ -510,21 +621,27 @@ public class QuadCLTCPU {
 	
 	public void setBlueSky (
 			double sky_seed, //  =       7.0;  // start with product of strength by diff_second below this
+			double lma_seed, //          2.0;  // seed - disparity_lma limit
 			double sky_lim, //   =      15.0; // then expand to product of strength by diff_second below this
 			int    sky_shrink, //  =       4;
 			int    sky_expand_extra, //  = 100; // 1?
 			double [] strength,
 			double [] spread,
+			double [] disp_lma,
+			double [] avg_val,
 			int debugLevel) {
 		int width = tp.getTilesX();
 		this.blue_sky = getBlueSky  (
 				sky_seed, //  =       7.0;  // start with product of strength by diff_second below this
+				lma_seed, //          2.0;  // seed - disparity_lma limit
 				sky_lim, //   =      15.0; // then expand to product of strength by diff_second below this
 				sky_shrink, //  =       4;
 				sky_expand_extra, //  = 100; // 1?
 				width,
 				strength,
 				spread,
+				disp_lma,
+				avg_val,
 				debugLevel);
 	}
 	
@@ -1020,7 +1137,7 @@ public class QuadCLTCPU {
 		}
 		// try to restore DSI generated from interscene if available, if not use single-scene -DSI_MAIN
 		int dsi_result = -1;
-		double [][] dsi_tmp = new double [11][];
+		double [][] dsi_tmp = new double [OpticalFlow.COMBO_DSN_TITLES.length][];
 		for (int i = 0; i <DSI_SUFFIXES.length; i++) {
 			dsi_result =restoreDSI(
 					DSI_SUFFIXES[i],
@@ -9722,6 +9839,7 @@ public class QuadCLTCPU {
 		  }
 		  // copy second_max from the BG pass to the last one (to be used)
 		  tp.clt_3d_passes.get(tp.clt_3d_passes.size()-1).setSecondMax(tp.clt_3d_passes.get(bg_pass).getSecondMax());
+		  tp.clt_3d_passes.get(tp.clt_3d_passes.size()-1).setAvgVal(tp.clt_3d_passes.get(bg_pass).getAvgVal());
  ///// Refining after all added   - end
 		  Runtime.getRuntime().gc();
 	      System.out.println("preExpandCLTQuad3d(): processing  finished at "+
@@ -13965,6 +14083,8 @@ public class QuadCLTCPU {
 		  scan.is_measured =   true; // but no disparity map/textures
 		  scan.is_combo =      false;
 		  scan.has_lma = null;
+		  scan.setAvgVal();
+		  scan.setSecondMax(); // always needed even with max_chn_diff==0 as it is exported in a file
 		  if (max_chn_diff > 0 ) {
 			  scan.resetByDiff(
 					  max_chn_diff,

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

@@ -343,10 +343,11 @@ public class TileNeibs{
 		boolean [] src_tiles = tiles.clone(); // just in case
 		// grow
 		boolean hor = true;
+		int num_prev = 0;
 		for (; grow > 0; grow--){
 			boolean single = (grow ==1) && hor;
 			src_tiles = tiles.clone();
-			int num_new = 0;
+			int num_new = 1; // as if previous pass was successful
 			if (hor){
 				for (int tileY = 0; tileY < sizeY; tileY++){
 					for (int tileX = 0; tileX < (sizeX - 1); tileX++){
@@ -394,9 +395,10 @@ public class TileNeibs{
 				}
 			}
 			hor = !hor;
-			if (num_new == 0){
+			if ((num_new == 0) && (num_prev == 0)){
 				break;
 			}
+			num_prev = num_new;
 		}
 	}
 

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

@@ -3913,11 +3913,12 @@ ImageDtt.startAndJoin(threads);
 		double [] disparity =     scan.getDisparity(use_final?0:1);
 		double [] disparityLMA =  scan.getDisparityLMA();
 		double [] second_max_bg = scan.getSecondMax();
+		double [] avg_val =       scan.getAvgVal();
 		if (!use_final) {
 			scan.setStrength(null);
 		}
 		double [] strength =     scan.getStrength();
-		return new double [][] {disparity, strength, disparityLMA,second_max_bg}; // second maximal difference between channels in BG 
+		return new double [][] {disparity, strength, disparityLMA,second_max_bg, avg_val}; // second maximal difference between channels in BG 
 	}
 
 	// TODO: update for variable length

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

@@ -82,6 +82,8 @@ public class TwoQuadCLT {
 	public static  int DSI_STRENGTH_RIG =       8;
 	public static  int DSI_SPREAD_MAIN =        9;
 	public static  int DSI_SPREAD_AUX =        10;
+	public static  int DSI_AVGVAL_MAIN =       11;
+	public static  int DSI_AVGVAL_AUX =        12;
 
 	public static String DSI_COMBO_SUFFIX = "-DSI_COMBO";
 	public static String DSI_MAIN_SUFFIX =  "-DSI_MAIN";
@@ -97,7 +99,9 @@ public class TwoQuadCLT {
 			    "strength_aux",
 			    "strength_rig",
 			    "spread_main",
-			    "spread_aux"};
+			    "spread_aux",
+			    "avgval_main",
+			    "avgval_aux"};
 
 	public long                                            startTime;     // start of batch processing
 	public long                                            startSetTime;  // start of set processing