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flutter_app/test/nms_test.dart

@@ -30,6 +30,25 @@ void main() {
     expect(result[0].score, greaterThan(0.5));
   });
 
+  test('bigBox_containsSmallBox_deduped', () {
+    // 同目标一大一小两框：标准 IoU = 0.04/0.13 ≈ 0.31 < 0.45 会漏，
+    // minIoU = inter/小框 = 1 必须去重（2026-09-01 用户实测：单模型也有重叠框）
+    final a = box(0.3, 0.3, 0.5, 0.5, 0.8); // 小框 0.2x0.2
+    final b = box(0.25, 0.25, 0.55, 0.55, 0.6); // 大框 0.3x0.3 套住小框
+    final result = nms([a, b], 0.45);
+    expect(result.length, 1);
+    expect(result[0].score, 0.8);
+  });
+
+  test('partiallyOverlapping_sameTarget_deduped', () {
+    // 标准 IoU = 0.075/0.195 ≈ 0.385 < 0.45 会漏；minIoU = 0.075/0.09 ≈ 0.83
+    final a = box(0.1, 0.1, 0.4, 0.4, 0.9); // 0.3x0.3
+    final b = box(0.15, 0.1, 0.55, 0.4, 0.5); // 0.4x0.3，与 a 重叠 0.25x0.3
+    final result = nms([a, b], 0.45);
+    expect(result.length, 1);
+    expect(result[0].score, 0.9);
+  });
+
   test('iou_nonOverlapping_isZero', () {
     final a = box(0.0, 0.0, 0.2, 0.2, 1);
     final b = box(0.8, 0.8, 1.0, 1.0, 1);