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Three-dimensional transparent objects recognition based on the digital holography and fractional correlator

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A novel three-dimensional (3-D) transparent object-recognition method is proposed. It combines the digital holographic technique with the fractional Fourier transform. The complex amplitude distribution of the 3-D transparent object can be recorded by use of the phase-shifting interferometry, and its bidimensional (2-D) Fresnel transform contents the entire information of the 3-D object, such as shape, orientation and location. By use of the fractional Fourier transform, the 3-D transparent objects can be recognized efficiently with the obtained 2-D information. An opto-electronic hybrid implementation has been also suggested.

Keywords: Pattern recognition; digital holography; fractional correlator

Document Type: Original Article


Affiliations: Department of Physics, Harbin Institute of Technology, Harbin 150001, PR China

Publication date: 2002-08-01

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