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디지털 이미지를 위한 방향성 순위필터 설계에 관한 연구
남진우 ( Jin-woo Nahm ) 한국고등직업교육학회 2008 한국고등직업교육학회논문집 Vol.9 No.2
The non-linear filter such as a median filter plays an important role among various methods of enhancing an image and removing random noise. This type of filter is one of an extended family of rank-order filters. On the other hand, a directional filter is a linear filter that minimizes the stair-case artifacts commonly produced from bi-linear interpolated images and simply zoomed images. In this paper, the directional rank-order filter is proposed, in which the two kinds of linear and non-linear filters are integrated effectively to remove stair-case artifacts for zoomed images, using three types of ranks; maximum, median, minimum. The optimum direction for a given pattern is first estimated from surrounding pixels in a window, then the optimum rank is also estimated for a given pattern of an image. The simulation result shows that the proposed new type of filter can enhance and remove stair-case effects effectively for bi-linear interpolated images or noisy images.