There is spatial correlation between the neighbored pixels , so there is the adjacent gray value.

大多数图象具有空间相关性, 绝大部分相邻的象素点具有相近的灰度值.

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The relationship between density and gray was defined, and the gray value was recommended.

建立了黑度与灰度间的联系并给出了推荐值.

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This paper presents a new point feature matching method based on gray value differential invariants.

本文提出了一种新的基于灰度差分不变量的点特征匹配方法.

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Gray value greater than the threshold value of the pixel is set to direct 255.

灰度值大于阈值的象素直接设置为255.

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