对滤波窗口的研究表明，自相关半径选择3 ~ 6个网格节点距为佳。
The study of filtering window shows that it is the best for self-correlation radius in 3 ~ 6 grid node distances.
两个节点间的逻辑距离，即一个跃距为从一个节点到邻近一个节点的距离。
The logical distance between two nodes. One hop is the distance from one node to an adjacent node.
渲染树上的节点称为“框”或者“盒”，符合CSS模型的定义，将页面元素看作一个具有填充、边距、边框和位置的盒。
Nodes in the render tree are called frames or boxes in accordance with the CSS model that treats page elements as boxes with padding, margins, borders, and position.
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