Added a script to generate and test directionality images
Added a script to generate and test directionality images

The script generates artificial images containing orientated structures,
either at random or in a preferred direction.

The preferred orientation is retrieved from analyzing the FFT power
spectrum.

Signed-off-by: Jean-Yves Tinevez <e56a6ee37544ca2467315a0f3163c8180fa84354@pasteur.fr>

tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab