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humansareaffectedfrom many kind ofdiseases. Proper Medicationistheonlywaytoovercome fromsuchdiseases.Somedicinesbecome most important part of human life.Manufacturing of medicines is done in very large scale. Duringmanufacturing, thereare many kind of defects in tablet blister, defects are likebreakage, cracksetcpresentin tablets or capsules.There may be side-effects of these defected tablets or capsules due to variation in dosage when consumed. The manufactured tablets should be properly inspected before reaching to the public, so that they do not cause any side-effects.Manual inspection of such defects in tablet blister may be very challenging task.Image segmentation is an important technique for automation of visual inspection. Hence, it is important to propose some approaches to detect these defects in tablet blister. In literaturesurvey many researchers have proposed multiple procedures for identifying defects in tablet blister. In this research work we review allthe methods used to identify defects in tablets blister.