1. A method of inspecting a liquid crystal panel for defects, comprising the steps of: i) inputting an image of a single liquid crystal panel wherein said liquid crystal panel contains parts; ii) generating density projection data for said image of said liquid crystal panel; iii) selecting a single defectless one of said liquid crystal panel parts as a single reference part and determining a vectorization starting point on said single reference part using said density projection data; iv) generating a vectorized contour of said single reference part using said vectorization starting point; and v) examining all other parts in said liquid crystal panel, which are to be inspected, by making a comparison with said single reference part based on said vectorized contour to determine which of said all other parts are defective.