scikit-image/scikit-image — pull request #1058 by nlsn (2014-07-11 21:25:20+00:00)
Title: Default structuring element (selem)

Functions based on erosion or dilation no longer require the user to specify a structuring element. The default structuring element is a cross-shape (connectivity=1). The number of dimensions in the image determines the dimentionality of the "hyper-cross" structuring element (ready for N-dimensional images).

Tests have been added to compare the results of the function called with an explicit structuring element with the function called without specifying the "selem".