Description: for an label matrix(eg.label of a 145*145 matrix),the 0 stands for the background,and non-zero stands for other pots.
to the matrix pointer ,the element stands for the coordinate of some pots in the picture.but some the element may not be integer.
the program is to select the pots which belongs to the background in the point matrix
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File list (Check if you may need any files):
background.m
matlab.mat
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