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How is instance segmentation different from semantic segmentation?


Asked by Zyaire Scott on Dec 11, 2021 FAQ



Instance segmentation :- Instance segmentation differs from semantic segmentation in the sense that it gives a unique label to every instance of a particular object in the image. As can be seen in the image above all 3 dogs are assigned different colours i.e different labels.
Similarly,
Semantic segmentation. Objects shown in an image are grouped based on defined categories. For instance, a street scene would be segmented by “pedestrians,” “bikes,” “vehicles,” “sidewalks,” and so on. Instance segmentation. Consider instance segmentation a refined version of semantic segmentation.
One may also ask, Instance segmentation. Consider instance segmentation a refined version of semantic segmentation. Categories like “vehicles” are split into “cars,” “motorcycles,” “buses,” and so on — instance segmentation detects the instances of each category. In other words, semantic segmentation treats multiple objects within a single category as one entity.
In addition,
To combine the concepts of both semantic and instance segmentation, panoptic segmentation assigns two labels to each of the pixels of an image – (i)semantic label (ii) instance id. The identically labelled pixels are considered belonging to the same semantic class and instance their id’s distinguish its instances.
In this manner,
Arguably the most difficult, relevant, and original meaning of Object Segmentation, "instance segmentation" means the segmentation of the individual objects within a scene, regardless of if they are the same type.