Dear Haibo,
The first argument passed to spm_bwlabel must be numeric, real, full and
double, as the error message says. If you specify a filename, you are
actually passing a *string* to the function.
Instead, you have to load your 3D array before calling the spm_bwlabel:
BW =
spm_read_vols(spm_vol('E:\luosisi\luosisi\individual-result\B3\I1-mask.img'));
[L,NUM] = spm_bwlabel(BW,18);
Note that it may still complain if BW is of a data type other than double.
In this case, use:
[L,NUM] = spm_bwlabel(double(BW),18);
Kind regards,
Anderson
