sujoy edge demo

[amarbit]

Hi
I added the sujoy edge demo. I checked locally It was working as expected. Kindly accept it.

[johnnychen94]

I've made some comments to make it a better demo.

Also, could you move the file to docs/examples/contours folder? It doesn't look good to me to have a separate section for this demo.

The result actually looks quite good to me so I personally think it's good to get this in. But I'd like to get @zygmuntszpak involved here to see if he has some other comments.

[zygmuntszpak]

I think Johnny has made some excellent suggestions. A further small detail:

edges = sujoy(img, kernel_nhood=0, just_filter=False)

Change False to false.

Also, since kernel_nhood toggles between a 4 or 8 connected neighbourhood, perhaps it is better to switch to a Bool type and instead of

kernel_nhood : 0(default) or 1

have something along the lines of

four_connectivity : true (default) or false (uses 8-connectivity instead)

[amarbit]

Hi
did all changes as you suggested. Please accept it.

[johnnychen94]

I've made some changes based on your codes, hope that's okay with you.