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A method for using an image digitizing system with a minicomputer to automatically determine surface-is presented. The problem of determining the sign of the displacement vector as well as the need to produce a monotonic phase change across the surface under observation is solved by utilizing the method of carrier fringes. A set of programs has been written so that the camera/computer system can view the pattern of deformation-modulated carrier fringes and, with a knowledge of the initial carrier-fringe pattern, draw a profile plot of the deformed surface.