Deploy from GitHub commit e5655c5148bdf9ff2f4a5d17d6cefe1ca9563ba1

app.py

@@ -1342,6 +1342,14 @@ def build_segmentation_bundle(contents: bytes):
     t0 = time.perf_counter()
     quad = np.asarray(plane["quad"], dtype=np.float32).reshape(4, 2) if plane and plane.get("quad") else None
     surface_mask, occluder_zone = build_floor_surface_mask(floor_mask, seg_map, quad, depth)
+    # N2 — final enclosed-island sweep on the FINISHED surface, without class
+    # protection: pattern features the segmenter calls objects (the blue
+    # accent tile in the kitchen reference room) pass the earlier protected
+    # fill and get re-cut by the occluder subtraction. At this stage a tiny
+    # hole fully enclosed by the surface is flat floor pattern by
+    # construction — real standing objects extend beyond the floor region, so
+    # their cut-outs stay connected to the rest of the scene and are immune.
+    surface_mask = fill_enclosed_islands(surface_mask, None, max_area=int(w * h * 0.001))
     print(f"[TIMING] Surface masking took {time.perf_counter() - t0:.3f} seconds", flush=True)
 
     t0 = time.perf_counter()

verify_n2_sim.py

@@ -54,6 +54,15 @@ def main():
 
     out = fill_enclosed_islands(mask, protect, max_area=2000)
 
+    # 7. final unprotected sweep (N2b): a fully-protected small island — a
+    # pattern feature the segmenter calls an object — must fill when the sweep
+    # runs without class protection on the finished surface, while the big
+    # protected mat hole still survives via max_area.
+    mask7 = np.ones((400, 600), np.uint8)
+    mask7[150:175, 300:330] = 0            # "blue accent tile" island
+    mask7[200:240, 100:190] = 0            # mat-sized hole (3600 px)
+    out7 = fill_enclosed_islands(mask7, None, max_area=1000)
+
     checks = [
         ("1 plain island filled", bool((out[52:68, 52:68] == 1).all())),
         ("2 bridged island filled", bool((out[212:224, 262:274] == 1).all())),
@@ -62,6 +71,8 @@ def main():
         ("4 stray-pixel island filled", bool((out[82:98, 402:418] == 1).all())),
         ("5 border hole kept", bool((out[2:28, 502:538] == 0).all())),
         ("6 big hole kept", bool((out[285:355, 385:555] == 0).all())),
+        ("7 final sweep fills pattern island", bool((out7[152:173, 302:328] == 1).all())),
+        ("7 final sweep keeps big hole", bool((out7[205:235, 105:185] == 0).all())),
     ]
     ok = True
     for name, passed in checks: