1. A method of analyzing a fringe image having separate regions, in which a fringe image carrying information of an object to be observed is analyzed so as to obtain said information of said object, said fringe image being constituted as an assembly of a plurality of separate independent fringe image regions, said method comprising the steps of: providing a mask to a gap separating said plurality of fringe image regions from each other; rendering a virtual fringe distribution to thus obtained mask region so as to yield a single continuous fringe image region; analyzing the whole surface of thus obtained single fringe image region by use of a predetermined fringe analysis method; and deleting information of said mask region from information of said single fringe image region obtained by said whole surface analysis, so as to yield desirable information of said fringe image.