(Generally asked for viva)

Morphology is the science of form and structure. Morphology, in the strictest sense, denotes a branch of biology that deals with the form and structure of animals and plants. In image processing, morphology is about regions and shapes. It is used as a tool for extracting image components that are useful in representing regions and shapes. Unlike the traditional image processing techniques, morphological techniques treat an image as an ensemble of sets.

Morphology can hence be defined as an interaction between two sets.