[
  {
    "image": "har_round1.jpg",
    "instruction": "请依次点击：虫 呈 般",
    "expected_points": [
      [
        149,
        252
      ],
      [
        48,
        55
      ],
      [
        549,
        351
      ]
    ],
    "note": "点选.har 第 1 道题; 用户实际第 3 击落点 (561,156) 偏上, 服务端返回 errorCode 50"
  },
  {
    "image": "har_round2.jpg",
    "instruction": "请依次点击：佰 衬 稗",
    "expected_points": [
      [
        449,
        53
      ],
      [
        549,
        353
      ],
      [
        349,
        152
      ]
    ],
    "note": "点选.har 第 2 道题; 用户把第 2/3 击顺序点反 (50)"
  },
  {
    "image": "har_round3.jpg",
    "instruction": "请依次点击：簿 蚕 沧",
    "expected_points": [
      [
        549,
        153
      ],
      [
        50,
        255
      ],
      [
        48,
        154
      ]
    ],
    "note": "点选.har 第 3 道题; 用户第 2/3 击落点错误 (9)"
  },
  {
    "image": "har_round4.jpg",
    "instruction": "请依次点击：沉 驰 齿",
    "expected_points": [
      [
        150,
        154
      ],
      [
        550,
        153
      ],
      [
        49,
        53
      ]
    ],
    "note": "点选.har 第 4 道题; 抓包结束时用户尚未提交"
  },
  {
    "image": "live_probe.jpg",
    "instruction": "请依次点击：笆 辩 裁",
    "expected_points": [
      [
        549,
        153
      ],
      [
        50,
        53
      ],
      [
        351,
        151
      ]
    ],
    "note": "实时抓取; ddddocr 把 笆 误读成 芭, 集成后仍正确指派"
  },
  {
    "image": "live_hard_rare_char.jpg",
    "instruction": "请依次点击：筹 炽 雹",
    "expected_points": [
      [
        449,
        253
      ],
      [
        49,
        353
      ],
      [
        250,
        255
      ]
    ],
    "note": "含生僻字 筹 且整题斜切; 单 ddddocr 对 筹 的最大概率仅 0.0046, PP-OCRv4 可正确识别"
  },
  {
    "image": "hard_adjacent_chars.jpg",
    "instruction": "请依次点击：长 澄 班",
    "expected_points": [
      [
        349,
        154
      ],
      [
        449,
        353
      ],
      [
        549,
        353
      ]
    ],
    "note": "失败样本修正: 旧阈值 V>=145 把暖色草地并入字形掩膜, 且 澄/班 横排相邻被膨胀粘连, 只剩 1~2 个候选; 收紧到 V>=190 后正常"
  },
  {
    "image": "hard_grass_background.jpg",
    "instruction": "请依次点击：菜 倍 钵",
    "expected_points": [
      [
        250,
        53
      ],
      [
        49,
        252
      ],
      [
        52,
        354
      ]
    ],
    "note": "失败样本修正: 倍/钵 竖排相邻被膨胀粘成一个 332x80 长条, 被长宽比过滤器丢弃; 收紧阈值后正常"
  }
]