RANK FILTER USING NEURAL NETWORK

A rank filter is provided which can be used for improving an image signal degraded by noise, while at the same time maintaining edge information. The rank filter is implemented by using a neural network and obtains a high processing speed with a simple circuit arrangement, as compared to conventional rank filters, HPFs, LPFs and average filters. The rank filter using the concept of a neural network includes decoder devices, a comparison device and a counter.