SPATIAL LIGHT-MODULATOR USED FOR THE FOURIER TRANSFORMATION OF VIDEO IMAGES

Coherent-optical Fourier transformation of video images can be very po werful; a set-up will be described. The modulation of the coherent bea m occurs in a spatial light modulator where the liquid crystal display image of the object is projected onto an optically addressed spatial light modulator that uses bismuth silicium oxide for photoconduction a nd a twisted nematic liquid crystal as a birefringent layer. Edge enha ncing of the image can occur; in addition, it appears that the Fourier spectrum of an edge is asymmetric due to local phase variations. The set-up was applied to recognize objects at different positions. A char ge-coupled device matrix camera detects the Fourier plane, in the pers onal computer the pixels are summed up to ring-wedge-segments and proc essed for pattern recognition.