SIOX ( abbreviation for Simple Interactive Object Extraction - an algorithm for extracting foreground objects from color photographs with little user assistance. SIOX is used as a tool in such graphic editors as GIMP (since version 2.3.3) and Inkscape .
First, a random selection tool is used to set the area of interest for the image. It should contain all the foreground objects that need to be extracted and the minimum background objects as possible. Pixels outside the selected area form a confident background, and the area inside the selection forms a superset of the foreground - that is, an undefined area. Then the so-called foreground brush to mark areas of confident foreground. The algorithm creates a selection mask, which can then be refined by adding annotations using background or foreground brushes.