Question

matlab函数bwlabel与bwlabeln的区别

Answer 1

Note: Comparing BWLABEL and BWLABELN
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BWLABEL supports 2-D inputs only, whereas BWLABELN support any
input dimension. In some cases you might prefer to use BWLABELN even
for 2-D problems because it can be faster. If you have a 2-D input
whose objects are relatively "thick" in the vertical direction,
BWLABEL will probably be faster; otherwise BWLABELN will probably be
faster.

两者区别不大。
bwlabel在二值图中目标区块垂直方向比较长的时候比较快，其他情况下，都是bwlabeln更快。
重要的一点是bwlabeln可以处理多维数组，而bwlabel只能接受二维的输入。