IMAGE FEATURE-EXTRACTION WITH THE OPTICAL HAAR WAVELET TRANSFORM

Optical wavelet transformation is implemented with a volume hologram i n the frequency domain. The 2-D Haar wavelets of different types and w ith different dilation factors are encoded with a polarizer, and their Fourier spectra are recorded in a volume hologram with an angular mul tiplexing technique. Different local features (such as corners and edg es) of an input image are extracted simultaneously by the corner and e dge Haar wavelets. Experimental results and computer simulation are co mpared and presented. The limitations and the feasibility of the syste m are discussed.