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

[Marcus Edel]

> +    
> +    this->Gradient(OutImage, Magnitude, Orientation);
> +    
> +    size_t downscale = std::max(1, (int)(shrink * scale));
> +    
> +    CubeType Hist = this->Histogram(Magnitude, Orientation,
> +                                downscale, 0);
> +
> +    channels.slice(slice_idx) =
> +    bilinearInterpolation( Magnitude, rsize, csize);
> +    slice_idx++;
> +    for(size_t i = 0; i < InImage.n_slices; ++i)
> +      channels.slice(i + slice_idx) =
> +      bilinearInterpolation( Magnitude, rsize, csize);    
> +    slice_idx += 3;
> +    scale += 0.5;

I would recommend to use ``slice_idx += n_slices``instead of ``slice_idx += 3;`` there is no guarantee that we call the function with a 3 channel image.

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