A run is defined as a horizontal string of consecutive foreground pixels. The Blob Analysis module can be used to obtain the total number of runs (M_NUMBER_OF_RUNS) for each blob. You can obtain results using MblobGetResult() or MblobGetResultSingle().
To obtain the length and coordinates of each run in a specific blob, use the MblobGetRuns() function. The runs that make up each blob can be used to calculate features that are not supported directly by MIL.