document: Optical encoding of color three-dimensional correlation Three-dimensional -LRB- 3D -RRB- correlation of color images , considering the color distribution as the third dimension , has been shown to be useful for color pattern recognition tasks . Nevertheless , 3D correlation can not be directly performed on an optical correlator , that can only process two-dimensional -LRB- 2D -RRB- signals . We propose a method to encode 3D functions onto 2D ones in such a way that the Fourier transform and correlation of these signals , that can be optically performed , encode the 3D Fourier transform and correlation of the 3D signals . The theory for the encoding is given and experimental results obtained in an optical correlator are shown
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