This function is generic.
Particular methods exist for the following objects:
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
threshold(...)
imwd.object
, imwdc.object
, irregwd object
, threshold.imwd
, threshold.imwdc
, threshold.irregwd
, threshold.wd
, threshold.wd3D
, threshold.wp
, threshold.wst
wd.object
, wd3D.object
, wp.object
, wst.object
.