document: Optical recognition of three-dimensional objects with scale invariance using a classical convergent correlator We present a real-time method for recognizing three-dimensional -LRB- 3-D -RRB- objects with scale invariance . The 3-D information of the objects is codified in deformed fringe patterns using the Fourier transform profilometry technique and is correlated using a classical convergent correlator . The scale invariance property is achieved using two different approaches : the Mellin radial harmonic decomposition and the logarithmic radial harmonic filter . Thus , the method is invariant for changes in the scale of the 3-D target within a defined interval of scale factors . Experimental results show the utility of the proposed method
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