Mean Gray Values 线观察平均灰度值 ; 平均灰度值
gray values of callus 骨痂灰度值
Region gray average values-grad 区域灰度均值
gray absolute correlation values 灰色绝对关联度
Their mean gray values were higher in the granular layer than in the pyramidal layer (P<0.05).
颗粒层中两者的平均灰度值都高于锥体层（P＜ 0．05）。
Finally took the fusion method according to the minimum principle of gray values to get the fused image.
再根据灰度值最小的原则作为图像融合方法，得到最终的二值化图像。
Noises that gray values increase sharply will be removed and iris images without bright holes will be left.
最后得到光斑填充后的虹膜图像，消除了虹膜图像中灰度值突然变高的噪声点。
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