docs(quick-260330-mb3): add summary and update state
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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# Quick Task 260330-mb3: 完整人脸识别示例
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**Date:** 2026-03-30
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**Commit:** 3c7e992
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## Summary
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重写 example 示例代码,实现真正的 1:1 人脸识别功能。
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## Changes
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### example/lib/main.dart
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- 完全重写 `FaceRecognitionScreen` 类
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- 实现 `_registerFace()` 方法:使用 `extractFaceFeature(extractType: 0)` 注册模式
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- 实现 `_verifyFace()` 方法:使用 `extractFaceFeature(extractType: 1)` + `compareFaceFeature()`
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- 使用 `SharedPreferences` 存储人脸特征数据 (Base64 编码)
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- 添加注册/验证模式切换功能
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- 显示相似度百分比和验证结果
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### example/pubspec.yaml
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- 添加 `shared_preferences: ^2.2.2` 依赖
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## Key API Usage
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| 流程 | API | 参数 |
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|------|-----|------|
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| 人脸检测 | `detectFaces()` | format=2050 (NV21) |
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| 注册特征提取 | `extractFaceFeature()` | extractType=0 (REGISTER) |
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| 识别特征提取 | `extractFaceFeature()` | extractType=1 (RECOGNIZE) |
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| 特征比对 | `compareFaceFeature()` | compareModel=0 (LIFE_PHOTO) |
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## Verification Threshold
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- 推荐阈值: 0.8 (生活照)
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- 相似度 >= 0.8 判定为同一人
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## Files Modified
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- `example/lib/main.dart` (+419/-208 lines)
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- `example/pubspec.yaml` (+3 lines)
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