We designed and implemented a composite-wavelet-matched filter that is invariant to continuous-scale changes of the input and is useful for correlation-based pattern recognition of objects whose size is not known exactly. We optimize the adaptive wavelet to extract sparse image features and use the scale–space analysis to determine the wavelet scale for the scale invariance. Experimental results obtained by use of a programmable optical correlator with three liquid-crystal spatial light modulators are demonstrated.
© 1999 Optical Society of America
Original Manuscript: November 12, 1998
Revised Manuscript: March 26, 1999
Published: September 10, 1999
Yunlong Sheng and Danny Roberge, "Continuous-scale-invariant pattern recognition with adaptive-wavelet-matched filters," Appl. Opt. 38, 5541-5547 (1999)