MANUFACTURE OF FILTER FOR PATTERN RECOGNITION AND PATTERN RECOGNITION DEVICE USING THE SAME

摘要

PURPOSE:To perform pattern recognition in a moment even when the size of a pattern to be recognized is different and it is rotated by forming a filter by performing logarithmic conversion setting the centroid of the image of a reference pattern as center coordinate, and performing Fourier transformation and extracting a phase component. CONSTITUTION:A CCD camera 2 image-picks up a pattern body 1 to be recognized, and outputs the image signal of the body to a computer 3. The computer 3 transmits image data by which a computed result is displayed on a monitor television 4. An image-forming lens 5 is arranged at the front of the monitor television 4, and a spatial light modulator 6 is arranged on the optical axis of the image-forming lens 5. A coherent image in accordance with an image- formed image incident from the modulator 6 can be obtained. An extension collimator lens system 8 and a half mirror 9 are arranged at the optical path of a laser outputted from a laser oscillator 7, and a laser beam is sent to the spatial light modulator 6 and also, to a Fourier transform lens 10.