Department of Electrical Engineering, Tampere University of Technology, P.O. Box 527, SF-33101 Tampere, Finland.
IEEE Trans Pattern Anal Mach Intell. 1987 Jan;9(1):74-90. doi: 10.1109/tpami.1987.4767873.
A new class of median type filters for image processing is proposed. In the filters, linear FIR substructures are used in conjunction with the median operation. The root signals and noise attenuation properties of the FIR-median hybrid filters are analyzed and compared to representative edge preserving filtering operations. The concept of multilevel median operation is introduced to improve the detail preserving property of conventional median and the FIR-median hybrid filters. In the multilevel filters there exists a tradeoff between noise attenuation and detail preservation. The analysis and examples indicate that FIR-median hybrid filters preserve details better and are computationally much more efficient than the conventional median and the K-nearest neighbor averaging filters.
提出了一类新的中值类型滤波器，用于图像处理。在这些滤波器中，线性 FIR 子结构与中值运算结合使用。分析了 FIR-中值混合滤波器的根信号和噪声衰减特性，并与代表性的边缘保持滤波操作进行了比较。引入了多级中值运算的概念，以提高传统中值和 FIR-中值混合滤波器的细节保持特性。在多级滤波器中，噪声衰减和细节保持之间存在权衡。分析和实例表明，FIR-中值混合滤波器比传统中值滤波器和 K-最近邻平均滤波器更好地保留细节，并且计算效率更高。
