Image segmentation - Wikipedia
https://en.wikipedia.org/wiki/Image_segmentation• Semantic segmentation is an approach detecting, for every pixel, belonging class of the object. For example, when all people in a figure are segmented as one object and background as one object.• Instance segmentation is an approach that identifies, for every pixel, a belonging instance of the object. It detects each distinct object of interest in the image. For example, when each person in a figure is segmented as an individual object.