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            "region_id": "transient_people_and_belongings",
            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
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              "pedestrian",
              "bag backpack luggage"
            ],
            "source": "grounding",
            "boxes_xyxy": [],
            "box_scores": [],
            "box_queries": [],
            "sam_predicted_iou": [],
            "mask_path": "masks/IMG_6453_transient_people_and_belongings.png"
          }
        ],
        "final_mask_path": "masks/IMG_6453.png",
        "routing_mask_path": "masks/IMG_6453_routing.png",
        "predicted_fraction": 0.0
      }
    },
    {
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      "source_image_name": "IMG_6454.JPG",
      "status": "detector_miss",
      "raw_mask_fraction": 0.0,
      "routing_mask_fraction": 0.0,
      "diagnosis": {
        "primary_cause": "transient_person",
        "person_visibility": "background_small",
        "severity": "low",
        "confidence": 0.82,
        "route": "small_region_mask",
        "rationale_zh": "人物位于远景或只占较小区域；不应因此删除整帧。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6454",
        "thresholds": {
          "box": 0.25,
          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
        "sam_checkpoint_sha256": "6d1aa6f30de5c92224f8172114de081d104bbd23dd9dc5c58996f0cad5dc4d38",
        "regions": [
          {
            "region_id": "transient_people_and_belongings",
            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
              "person",
              "pedestrian",
              "bag backpack luggage"
            ],
            "source": "grounding",
            "boxes_xyxy": [],
            "box_scores": [],
            "box_queries": [],
            "sam_predicted_iou": [],
            "mask_path": "masks/IMG_6454_transient_people_and_belongings.png"
          }
        ],
        "final_mask_path": "masks/IMG_6454.png",
        "routing_mask_path": "masks/IMG_6454_routing.png",
        "predicted_fraction": 0.0
      }
    },
    {
      "frame_id": "IMG_6455",
      "source_image_name": "IMG_6455.JPG",
      "status": "detector_miss",
      "raw_mask_fraction": 0.0,
      "routing_mask_fraction": 0.0,
      "diagnosis": {
        "primary_cause": "transient_person",
        "person_visibility": "clear_region",
        "severity": "medium",
        "confidence": 0.94,
        "route": "region_mask_required",
        "rationale_zh": "主要移动人物轮廓清楚，形成局部遮挡，但帧内大部分静态几何仍可使用。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6455",
        "thresholds": {
          "box": 0.25,
          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
        "sam_checkpoint_sha256": "6d1aa6f30de5c92224f8172114de081d104bbd23dd9dc5c58996f0cad5dc4d38",
        "regions": [
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            "region_id": "transient_people_and_belongings",
            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
              "person",
              "pedestrian",
              "bag backpack luggage"
            ],
            "source": "grounding",
            "boxes_xyxy": [],
            "box_scores": [],
            "box_queries": [],
            "sam_predicted_iou": [],
            "mask_path": "masks/IMG_6455_transient_people_and_belongings.png"
          }
        ],
        "final_mask_path": "masks/IMG_6455.png",
        "routing_mask_path": "masks/IMG_6455_routing.png",
        "predicted_fraction": 0.0
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    },
    {
      "frame_id": "IMG_6456",
      "source_image_name": "IMG_6456.JPG",
      "status": "detector_miss",
      "raw_mask_fraction": 0.0,
      "routing_mask_fraction": 0.0,
      "diagnosis": {
        "primary_cause": "transient_person",
        "person_visibility": "clear_region",
        "severity": "medium",
        "confidence": 0.94,
        "route": "region_mask_required",
        "rationale_zh": "主要移动人物轮廓清楚，形成局部遮挡，但帧内大部分静态几何仍可使用。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6456",
        "thresholds": {
          "box": 0.25,
          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
        "sam_checkpoint_sha256": "6d1aa6f30de5c92224f8172114de081d104bbd23dd9dc5c58996f0cad5dc4d38",
        "regions": [
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            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
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            "source": "grounding",
            "boxes_xyxy": [],
            "box_scores": [],
            "box_queries": [],
            "sam_predicted_iou": [],
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        ],
        "final_mask_path": "masks/IMG_6456.png",
        "routing_mask_path": "masks/IMG_6456_routing.png",
        "predicted_fraction": 0.0
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    },
    {
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      "status": "detector_miss",
      "raw_mask_fraction": 0.0,
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      "diagnosis": {
        "primary_cause": "transient_person",
        "person_visibility": "clear_region",
        "severity": "medium",
        "confidence": 0.94,
        "route": "region_mask_required",
        "rationale_zh": "主要移动人物轮廓清楚，形成局部遮挡，但帧内大部分静态几何仍可使用。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6457",
        "thresholds": {
          "box": 0.25,
          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
        "sam_checkpoint_sha256": "6d1aa6f30de5c92224f8172114de081d104bbd23dd9dc5c58996f0cad5dc4d38",
        "regions": [
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            "region_id": "transient_people_and_belongings",
            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
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            ],
            "source": "grounding",
            "boxes_xyxy": [],
            "box_scores": [],
            "box_queries": [],
            "sam_predicted_iou": [],
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        ],
        "final_mask_path": "masks/IMG_6457.png",
        "routing_mask_path": "masks/IMG_6457_routing.png",
        "predicted_fraction": 0.0
      }
    },
    {
      "frame_id": "IMG_6458",
      "source_image_name": "IMG_6458.JPG",
      "status": "detector_miss",
      "raw_mask_fraction": 0.0,
      "routing_mask_fraction": 0.0,
      "diagnosis": {
        "primary_cause": "transient_person",
        "person_visibility": "clear_region",
        "severity": "medium",
        "confidence": 0.94,
        "route": "region_mask_required",
        "rationale_zh": "主要移动人物轮廓清楚，形成局部遮挡，但帧内大部分静态几何仍可使用。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6458",
        "thresholds": {
          "box": 0.25,
          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
        "sam_checkpoint_sha256": "6d1aa6f30de5c92224f8172114de081d104bbd23dd9dc5c58996f0cad5dc4d38",
        "regions": [
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            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
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            "source": "grounding",
            "boxes_xyxy": [],
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        ],
        "final_mask_path": "masks/IMG_6458.png",
        "routing_mask_path": "masks/IMG_6458_routing.png",
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    },
    {
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      "raw_mask_fraction": 0.0,
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        "person_visibility": "strong_foreground",
        "severity": "high",
        "confidence": 0.97,
        "route": "region_mask_required",
        "rationale_zh": "主要移动人物位于近景或占据较大画面区域，明显遮挡喷泉/背景几何。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6459",
        "thresholds": {
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          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
        "sam_checkpoint_sha256": "6d1aa6f30de5c92224f8172114de081d104bbd23dd9dc5c58996f0cad5dc4d38",
        "regions": [
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            "cause": "transient_occluder",
            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
            "queries": [
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            "source": "grounding",
            "boxes_xyxy": [],
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        ],
        "final_mask_path": "masks/IMG_6459.png",
        "routing_mask_path": "masks/IMG_6459_routing.png",
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    },
    {
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      "status": "detector_miss",
      "raw_mask_fraction": 0.0,
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      "diagnosis": {
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        "person_visibility": "other_pedestrian",
        "severity": "medium",
        "confidence": 0.82,
        "route": "region_mask_required",
        "rationale_zh": "可见另一位路人；跨相邻视图位置变化，属于瞬态遮挡。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6461",
        "thresholds": {
          "box": 0.25,
          "text": 0.2,
          "nms": 0.5
        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
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            "semantic_description": "all visible transient people and their carried bags, backpacks, luggage, or loose belongings",
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        ],
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        "confidence": 0.97,
        "route": "region_mask_required",
        "rationale_zh": "主要移动人物位于近景或占据较大画面区域，明显遮挡喷泉/背景几何。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
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        "thresholds": {
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        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
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        ],
        "final_mask_path": "masks/IMG_6462.png",
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    },
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        "person_visibility": "none_visible",
        "severity": "none",
        "confidence": 0.76,
        "route": "retain_with_robust_water_traffic_handling",
        "rationale_zh": "未见明确的主要移动人物；但无干净 reference，且水面、车辆或远处行人仍可能产生残差。"
      },
      "grounding": {
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        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
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    },
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        "confidence": 0.76,
        "route": "retain_with_robust_water_traffic_handling",
        "rationale_zh": "未见明确的主要移动人物；但无干净 reference，且水面、车辆或远处行人仍可能产生残差。"
      },
      "grounding": {
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        "sample_id": "IMG_6464",
        "thresholds": {
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        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
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    },
    {
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        "confidence": 0.76,
        "route": "retain_with_robust_water_traffic_handling",
        "rationale_zh": "未见明确的主要移动人物；但无干净 reference，且水面、车辆或远处行人仍可能产生残差。"
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      "grounding": {
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        "thresholds": {
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        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
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    },
    {
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        "person_visibility": "partial_or_edge",
        "severity": "low",
        "confidence": 0.79,
        "route": "edge_region_mask_or_review",
        "rationale_zh": "人物、衣物或携带物仅在画面边缘/遮挡后局部可见，需要区域复核。"
      },
      "grounding": {
        "schema_version": "diag.ground_sam.v1",
        "sample_id": "IMG_6466",
        "thresholds": {
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        },
        "grounding_model": "/local/scratch-2/fy277/temp/diag3dgs/models/grounding-dino-tiny",
        "sam_checkpoint": "/local/scratch-2/fy277/temp/diag3dgs/models/sam2.1/sam2.1_hiera_small.pt",
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        ],
        "final_mask_path": "masks/IMG_6466.png",
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      }
    },
    {
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      "status": "clean_zero",
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      "diagnosis": {
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