Title :
Scale and illumination-invariant road sign detection
Author :
Perez, Elisabet ; Javidi, Bahrain
Author_Institution :
Dept. Opt. i Optometria, Univ. Politecnica de Catalunya, Barcelona, Spain
Abstract :
A road sign recognition system that allows detection under a wide range of scale variation is presented. The recognition system is implemented by a nonlinear JTC. Precise index of nonlinearity is chosen to obtain good discrimination capabilities, as well as, illumination-invariance. We compare the performance of two different methods: the use of composite filters, and when a filter bank is used. In particular, we consider Fourier-plane nonlinear filters as composite filters
Keywords :
Fourier transform optics; image recognition; nonlinear optics; optical correlation; spatial filters; Fourier-plane nonlinear filter; composite filter; filter bank; illumination invariance; image recognition; joint transform correlator; nonlinearity index; road sign detection; scale invariance; Computed tomography; Filter bank; Layout; Lighting; Nonlinear filters; Nonlinear optics; Optical filters; Optimized production technology; Roads; Target recognition;
Conference_Titel :
Lasers and Electro-Optics Society 2000 Annual Meeting. LEOS 2000. 13th Annual Meeting. IEEE
Conference_Location :
Rio Grande
Print_ISBN :
0-7803-5947-X
DOI :
10.1109/LEOS.2000.894070
