Extraction of 3-D location of matched 3-D object using power fringe-adjusted filtering and Wigner analysis

Optical image recognition of three-dimensional (3-D) objects has recently b een proposed. The proposed system basically performs correlation of the hol ographic information of a 3-D reference object and that of a 3-D target: ob ject, and hence 3-D matching is possible. However, the system is not 3-D sh ift-invariant. A solution for 3-D shift invariance has been pointed out, bu t has the drawback that only target objects that are farther away than the reference object can be shift-invariantly detected. We propose a method by which 3-D shift invariance is possible without that drawback. The method ap plies Wigner analysis to the power-fringe-adjusted-filtered correlation out put to extract the 3-D location of the matched target object. We analyze th e proposed method and present computer simulation results. (C) 1999 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(99)02012-7].