應用於彩色影像的改良式中值濾波器

An Improved Median Filter For Color Images with Impulse Noise

高世恆(Shi-Hung Gao) ； 周賢興(Hsien-Hsin Chou)

《國立宜蘭大學工程學刊》 4期 (2008/02) Pp. 19-38

https://doi.org/10.6176/BCE.2008.04.12

摘要

本文提出一個以中值濾波器為基礎架構的簡易非線性影像濾波器演算法，此濾波器能有效的處理脈衝雜訊對數位彩色影像所造成的影響，並改善傳統濾波器所產生的色變問題。它的特點在於：（1）濾除彩色影像雜訊所需計算較向量濾波器簡潔，因此較適用於各種低成本之即時性應用和實現；（2）可同時處理傳統濾波器和向量濾波器在處理彩色影像時對影像平滑和邊緣正確性折衝的問題。由實驗結果顯示，本文所提出之演算法在移除脈衝雜訊之效果優於傳統濾波器，並顯著降低處理雜訊後對影像邊緣所造成的破壞。

關鍵字

中值濾波器 ； 向量濾波器 ； 脈衝雜訊

並列摘要

In this paper, we propose a simple non-linear image filter based on the median filter structure. The proposed algorithm achieves the effective noise-removal for color image with impulse noises, and reduces the discoloration problem of the traditional filter. The major advantages of the novel method include: (1) it takes less calculations than the vector filter in the color image process, so the proposed method is more suitable for using in several low-cost and real-time applications. (2) It can deal with the tradeoff problem between image smoothing and edge correction caused in the filtering process. The experimental results show that our method performs better effect than traditional filter and significantly reduces the damages of image edge in the procedure of removing the impulse noise.

並列關鍵字

Median filter ； Vector filter ； impulse noise