Adaptive wideband homomorphic filtering for electromagnetic interference source imaging testing system

This paper presents an adaptive wideband homomorphic filtering which is directly applied to suppress the coherent noise in electromagnetic interference source imaging testing system. When the electromagnetic interference sources are coherent sources, the interference intensity of the diffraction wave is stronger than the intensity of the object point and the false detections will occur. In order to improve the quality of the image, an adaptive homomorphic filter algorithm is proposed to suppress the coherent noise in wide band. The mean square error of the system is minimized to determine the optimal parameters of the filter, and then the homomorphic transformation is used to suppress the coherence noise. The experiments result show that the proposed algorithm can successfully suppress the coherent noise in a wideband compared to the other method that does not require a high performance image sensor.