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P47 scene-detail analysis (LV_P47_SHOT=1)

1) 倒影区 luma 相关性 (bank column profile vs vertically-mirrored water band)
   p47-day: pearson r = 0.299 (required >= 0.2)
   p47-night: pearson r = 0.322 (required >= 0.2)
   reflection vs control water luma delta (night) = 54.40 (required >= 10.0)

2) 元素数量指标
   reeds=510 floats=64 reflections=18 sources=41

3) 无大黑块 / 无白块 / 不透明校验
   p47-day: alpha_min=255 black_px=0 black_block=None white_block=None
   p47-night: alpha_min=255 black_px=0 black_block=None white_block=None
   p47-close: alpha_min=255 black_px=0 black_block=None white_block=None

verdict = PASS