intelligent fill algorithm

introduction of filling algorithm

https://stackoverflow.com/questions/2530449/how-does-content-aware-fill-work

https://web.archive.org/web/20190404055934/https://research.adobe.com/project/content-aware-fill/

https://web.archive.org/web/20190326031851/http://www.wisdom.weizmann.ac.il/~vision/VideoCompletion.html