nor
 details differ. The choices were made for speed of the resulting code:
 ~.008s for a 640x480x3 color image on a standard machine from 2011.

 This function is essentially a wrapper for calls to gradientMag()
 and gradientHist(). Specifically, it is equivalent to the following:
  [M,O] = gradientMag( I ); softBin = 1; useHog = 1;
  H = gradientHist(M,O,binSize,nOrients,softBin,useHog,clip);
 See gradientHist() more general usage.

 This code requires SSE2 to compile and run (most modern Intel 