An improved median filter algorithm based on light sensor

Based on the sensitive character of light sensor, the paper applied the median filtering algorithm which was used for two-dimensional image process on the filtering of one-dimensional sensor signal and improved the algorithm with adding a determine step about heavy interference signal. The research showed that the miss-rate and the false-rate of improved median filtering algorithm are 0 and the deviate-rate decent to 0.2% from 5.1% in classic median filtering algorithm. Therefore, the improved median filtering algorithm can not only contain the advantages of classic median filtering algorithm, but also filter the heavy interference signal efficiently. The algorithm was better in eliminating the noise and keeping the real signal.