We first discuss the restriction on the incoherent source and the color filters in a joint transform correlation (JTC) system for white-light color pattern recognition and then report on a novel, to our knowledge, solution of channeling in a white-light JTC system, using a tricolor grating to encode the color patterns in real time. The theoretical analyses and the experimental results show not only that the restriction on the experimental condition is relieved but also that parallel channeling of the power spectra of the encoded pattern is easily performed. In addition, the zero-order power spectrum also forms a useful channel for the shape-only correlation.
© 1999 Optical Society of America
(050.2770) Diffraction and gratings : Gratings
(070.2590) Fourier optics and signal processing : ABCD transforms
(070.4550) Fourier optics and signal processing : Correlators
(100.5010) Image processing : Pattern recognition
(330.1690) Vision, color, and visual optics : Color
Hongchen Zhai, Guoguang Mu, Jie Sun, Xiushan Zhu, Fulai Liu, Hui Kang, and Yuanling Zhan, "Color Pattern Recognition in White-Light Joint Transform Correlation," Appl. Opt. 38, 7238-7244 (1999)