code: public static <T extends ImageGray<T>> void stdDev(Planar<T> input, T output, @Nullable T avg) {
  		stdDev(input, output, avg, 0, input.getNumBands() - 1);
  	}
docs: Computes the standard deviation for each pixel across all bands in the {@link Planar} image.
  
  @param input Planar image
  @param output Gray scale image containing average pixel values
  @param avg Gray scale image containing average projection of input