An efficient method of noise removal in Joint Transform Correlator

摘要

This paper describes a method of noise elimination in a joint transform correlator (JTC). In the JTC the final output the correlation peaks, are immersed in the noise hence often it is difficult to detect. In this technique final output is grabbed on a CCD camera and is programmed to perform change detection between real time correlation output and a static output of back ground noise. The change detection between these two frames completely eliminates the static and DC noise. Electrically addressed spatial light modulators (EASLMs) having 640x480 resolution elements, are used in object and Fourier planes. Laser diode of 5mW is used for modulation of images and illumination of Joint Power Spectrum. The results are captured with the help of CCD cameras and displayed on monitors. Complete noise elimination has been achieved in a final output by this method and the noise free correlation peaks are obtained.. The best result achieved by digitally processed correlation peaks and choosing an optimum intensity value to suppress the noise and enhancement of the correlation peaks.