```json
{
  "schema_version": "visual_qc_v2",
  "visual_score": 100,
  "summary": "未发现超过阈值的画面行为问题。",
  "frames_analyzed": 4,
  "sheets_analyzed": 13,
  "estimated_no_face_ratio": 0.0,
  "estimated_phone_ratio": 0.0,
  "phone_demo_ratio": 0.75,
  "away_from_camera_ratio": 0.0,
  "car_inside_seen": false,
  "car_inside_evidence": [],
  "away_from_camera_segments": [],
  "evidence": [],
  "risks": [],
  "suggestions": [],
  "checks": [
    {
      "name": "不露脸",
      "status": "pass",
      "value": 0.0,
      "threshold": "不超过10%；车内/车辆/手机工作演示不计入违规分母",
      "deduction": 0,
      "evidence": [],
      "suggestion": "减少长时间背身或只拍空景，产品特写可保留但需要及时回到主播讲解。"
    },
    {
      "name": "私人玩手机",
      "status": "pass",
      "value": 0.0,
      "threshold": "不超过10%；留资/报价/小风车演示不算玩手机",
      "deduction": 0,
      "evidence": [],
      "suggestion": "站在镜头前避免低头处理私人手机；如需演示留资或报价，动作和画面要明确指向业务流程。"
    },
    {
      "name": "离开镜头",
      "status": "pass",
      "value": 0.0,
      "threshold": "不超过10%；车辆/内饰展示不算离开镜头",
      "deduction": 0,
      "evidence": [],
      "suggestion": "切换机位或展示车辆时保持讲解连续，避免出现无人空镜头。"
    },
    {
      "name": "车内/内饰镜头",
      "status": "pass",
      "value": false,
      "threshold": "按规则展示为是/否；是否扣分取决于设置",
      "deduction": 0,
      "evidence": [],
      "suggestion": "如不允许进车内或拍内饰，请在直播前明确机位边界；如果允许展示，保持记录即可。"
    }
  ],
  "issue_summary": [],
  "normal_summary": [
    "不露脸：正常",
    "私人玩手机：正常",
    "离开镜头：正常"
  ],
  "thresholds": {
    "no_face_ratio": 0.1,
    "phone_ratio": 0.1,
    "deduct_car_inside_on_seen": true
  },
  "extra_requirements": "",
  "frame_labels_sample": [
    {
      "sheet": "sheet_013.jpg",
      "cell": 1,
      "scene": "手机工作演示",
      "anchor_visible": false,
      "face_visible": false,
      "private_phone_use": false,
      "work_phone_demo": true,
      "car_inside_seen": false,
      "away_from_camera": false,
      "product_or_demo": true,
      "confidence": 0.95,
      "evidence": "手持手机展示汽车应用界面，为工作演示"
    },
    {
      "sheet": "sheet_013.jpg",
      "cell": 2,
      "scene": "手机工作演示",
      "anchor_visible": false,
      "face_visible": false,
      "private_phone_use": false,
      "work_phone_demo": true,
      "car_inside_seen": false,
      "away_from_camera": false,
      "product_or_demo": true,
      "confidence": 0.95,
      "evidence": "手持手机展示车型选择界面，为工作演示"
    },
    {
      "sheet": "sheet_013.jpg",
      "cell": 3,
      "scene": "手机工作演示",
      "anchor_visible": false,
      "face_visible": false,
      "private_phone_use": false,
      "work_phone_demo": true,
      "car_inside_seen": false,
      "away_from_camera": false,
      "product_or_demo": true,
      "confidence": 0.95,
      "evidence": "手持手机展示优惠券界面，为工作演示"
    },
    {
      "sheet": "sheet_013.jpg",
      "cell": 4,
      "scene": "主播出镜",
      "anchor_visible": true,
      "face_visible": true,
      "private_phone_use": false,
      "work_phone_demo": false,
      "car_inside_seen": false,
      "away_from_camera": false,
      "product_or_demo": false,
      "confidence": 0.98,
      "evidence": "女主播站在蓝色SUV旁讲解，面部清晰可见"
    }
  ]
}
```