A neural network‐based nonlinear filter for image enhancement

Abstract

This paper explores a novel neural network-based nonlinear filter that has the ability to remove mixed noises and sharpen the edges in noise-corrupted digital images. The noise is assumed to be a mixture of both Gaussian and impulse types. Initially, a nonlinear filter is used to reduce the noise. The smoothed image is then combined with the output of an edge detector using a synthesizer to provide the effect of noise reducing and edge sharpening. The smoother and synthesizer are designed by using layered neural networks. Simulation results show that the proposed filter can effectively remove the mixed Guassian and impulsive noises and sharpen the edges. It can adapt itself to the various noise environments by learning during the training process.

Automatic Verification of Intelligent Electricity Meter with Image Processing and Digit Recognition

“…With the rapid development of the image processing and digit recognition, lots of progress is made in the field [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Zhang et al explored a novel neural network-based nonlinear filter, which was able to remove mixed noises and sharpen the edges in noisecorrupted digital images [1]. Simulation results showed that the proposed filter was able to effectively remove the mixed Gaussian and impulsive noises and sharpen the edges.…”