Scribble Selection is one of the shinning features of Adobe Photoshop Touch App, available for both iPad and Android Tablets. I designed and developed the main algorithm behind this feature.
John Nack, former Product Manger of Photoshop Touch commented on this feature: “If I had to boil the app down to one feature, it is this: Take two images, remove the background from one, and then blend the two images together to create a new scene. The Scribble Selection tool lets you use your finger or a stylus to quickly draw on the foreground object you want to keep and the background you want to delete. Then tap Extract, and the background disappears.”
A popular Youtube video demo of the tool is here.