Abstract

A new kind of principle is proposed to measure distorted transparent objects and specular surfaces directly. The method is based on correlation filtering of the object under study with two coded masks in noncoherent Fourier transformation. The information about the phase gradient appears in the form of fringes. The systems are analyzed mathematically. The following properties are shown: The systems can perform in real time and with an extended white light illumination. The various information can be obtained by using different masks. The sensitivity is relatively low and can be altered, marked, continuously varied, and even graded into several sections of different values. Some experiments and possible applications are shown.

© 1982 Optical Society of America

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