典型地，一个灰度图像的面积直方图就是图像中连接元素的面积统计分布。
Typically, an area histogram of intensity image is based on the statistics of connected components.
IEEE引用从一个工件到另一个工件的连接元素，并用这种定义作为这个练习中单纯证明。
The IEEE refers to linking elements from one artifact to another and USES such definitions as the pure justification of this exercise.
重新命名它们，如图3至5所示，但是现在不要连接这些元素。
Rename them as shown in Figures 3 to 5, but don't connect the elements for now.
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