1. A method of inspecting a stud bump having a bump pedestal and a bump head, comprising the steps of: imaging an external appearance of the stud bump to produce image data; converting the image data to bi-level image data of high and low level; performing on said bi-level image data extraction of a continuous image grain area having image grain of like level and of maximum continuous area from said bi-level image data to produce continuous area data and hole filling a hole in to produce a filled area data representing a filled area and hole data representing the hole filled; measuring the filled area to determine at least one pedestal dimension and pedestal position of the bump pedestal by processing said filled area data; measuring said hole filled during said hole filling to determine at least one head dimension and head position of the bump head by processing said hole data representing the hole filled; and determining whether the at least one pedestal dimension, the pedestal position, the head dimension and head position are within respectively set value ranges and indicating the stud bump is defective when the determination is negative.