AN ADAPTIVE METHOD OF MULTI-CHANNEL RANK FILTERING FOR NOISE REMOVAL IN COLOR IMAGES
Abstract. An adaptive spatial filtering method is developed for impulse noise removal in digital color images. The method is based on multi-channel rank (median) vector filtering in two slide windows of different size. Additive noise suppression is achieved by using a channel with minimal signal variation. Small image details and object edges are preserved due to minimal window size selection. Impulse noise removal and retention of color characteristics are provided by setting the vector with minimal distance from evaluated median vector.
Keywords: vector filters, multichannel image processing, impulse noise, median filtering.