[mlpack-git] [mlpack/mlpack] edge_boxes: feature extraction updated, tests added (#696)

[Marcus Edel]

> +    // do same for dy.
> +    dy.slice(i).row(0) = InImage.slice(i).row(1) - InImage.slice(i).row(0);
> +    dy.slice(i).row(InImage.n_rows - 1) = InImage.slice(i).row(InImage.n_rows - 1)
> +                                        - InImage.slice(i).row(InImage.n_rows - 2);
> +
> +    for (size_t j = 1; j < InImage.n_rows-1; j++)
> +      dy.slice(i).row(j) = 0.5 * ( InImage.slice(i).row(j+1) - InImage.slice(i).row(j) );
> +  }  
> +
> +  CubeType mag(InImage.n_rows, InImage.n_cols, InImage.n_slices);
> +  for (size_t i = 0; i < InImage.n_slices; ++i)
> +  {
> +    mag.slice(i) = arma::sqrt( arma::square \
> +                  ( dx.slice(i) + arma::square( dy.slice(i) ) ) );
> +  }
> +

Do you think we could use the sobel convolution kernel here? 

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