为MATLAB中的图形增加标签，从而可以有效地表示图形意义，防止读不懂图的情况- 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-

bwlabel via disjoint set-bwlabel via disjoint set