A system and method for creating a three-dimensional image of an opaque object utilize frequency diverse coherent illumination in combination with an opacity constraint in performing three-dimensional phase retrieval and/or profile retrieval. An opaque object is one which exhibits only surface scattering...http://www.google.de/patents/US5627363?utm_source=gb-gplus-sharePatent US5627363 - System and method for three-dimensional imaging of opaque objects using frequency diversity and an opacity constraint
