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src/edge_refinement.py

@@ -294,7 +294,11 @@ def extract_ring_zone_roi(
         half_height = zone_length * 0.25   # 0.25x / 2
     else:
         half_height = zone_length * 0.25   # 0.5x / 2
-    half_width = zone_length * 0.6  # 1.5x / 2
+    # ROI width = 1.6x zone_length. zone_length = |DIP-PIP| can be close to
+    # finger width on chubby/short proximal phalanxes; 1.2x left almost no
+    # margin and the SAM mask hit the ROI wall on slightly off-axis fingers,
+    # which the right_mask_boundary == max_col guard then rejected as bleed.
+    half_width = zone_length * 0.8
 
     x_min = int(np.clip(center[0] - half_width, 0, w - 1))
     x_max = int(np.clip(center[0] + half_width, 0, w - 1))