ns). Otherwise the outputs are the computed channels
 and additional meta-data (see below). The channels are computed at a
 single scale, for (fast) multi-scale channel computation see chnsPyramid.

 An emphasis has been placed on speed, with the code undergoing heavy
 optimization. Computing the full set of channels used in the BMVC09 paper
 referenced above on a 480x640 image runs over *100 fps* on a single core
 of a machine from 2011 (although runtime depends on input parameters).

 USAGE
  pChns = chns