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xiaoxia-saas/apps/worker/video_processing
xiaoxia f3024e8e17
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feat: pHash阈值校准+颜色直方图融合 #1658
Issue #1658: 提高查重检测精度

改动摘要:
- PHASH_THRESHOLD 从 10 收紧到 8
- 均值 → 中位数抵抗黑帧/转场干扰 (statistics.median)
- 新增帧匹配比例条件 MATCH_RATIO_THRESHOLD=0.7
- 新增 Bhattacharyya 系数融合颜色直方图 (0.7 pHash + 0.3 hist)
- 删除旧 _average_histogram_similarity()
- 提取 _check_fusion_duplicate() 共用方法
- 改造 compute_duplicate_rate() 使用融合逻辑
- reason 标记: phash_histogram_fusion / batch_phash_histogram_fusion
- 向后兼容: 无直方图数据时 hist_similarity 回退到 0.5

新增常量:
- PHASH_THRESHOLD = 8
- MATCH_RATIO_THRESHOLD = 0.7
- DUPLICATE_THRESHOLD = 0.70
- PHASH_WEIGHT = 0.7
- HISTOGRAM_WEIGHT = 0.3

测试:
- test_dedup_v2.py: 34 个新测试全绿
- test_dedup_pure.py: 删除10个引用已删除方法的旧测试, 剩余10个全绿
- 总计 44 个测试全部通过
2026-09-03 23:07:15 +08:00
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