t], [full] )

 INPUTS
  I          - [hxwxk] input k channel single image
  channel    - [0] if&gt;0 color channel to use for gradient computation
  normRad    - [0] normalization radius (no normalization if 0)
  normConst  - [.005] normalization constant
  full       - [0] if true compute angles in [0,2*pi) else in [0,pi)

 OUTPUTS
  M          - [hxw] gradient magnitude at each location
  O          - [hxw] approximate gradient orientation modulo PI

 EXAMPLE
  I=rgbConvert(imread('peppers.p