一个高效的椒盐噪声去除方法(英文)

来源 :北京大学学报(自然科学版) | 被引量 : 16次 | 上传用户:liarcher
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
给出了一个更为简单高效的两阶段去除图象椒盐噪声的方法。第一阶段:应用自适应中值滤波方法来检测图像中的噪声点;第二阶段:应用全局的BB方法来求解一个极小化问题。通过对第二阶段中保边正则化方法的改进,不仅不再需要进行正则化参数的选择,而且保边势函数φ(t)=tα中的参数α可以自适应地产生,从而使得这个新的方法不再存在参数的选取问题。与已有方法相比,这一新方法节省了计算时间,特别对于噪声污染严重的图像,新的方法的恢复效果更佳。
其他文献
Prorocentrum micans was cultivated in different media including f/2, f/4, f/8, f/20, f/25, f/50, f/100 and f/200. Results showed that media influence the growth of P.micans. The biomass of P.micans in
期刊
Effects of 2,4-D on seedling growth and chromosomal abnormalities were studied in Triticum aestivum and Phalaris minor.Seeds were soaked at different concentrations of 2,4-D (0.01%,0.1%,1.0%) for 4,8,
期刊
In this paper a novel 3D model retrieval method that employs multi-level spherical moment analysis and relies on voxelization and spherical mapping of the 3D models is proposed. For a given polygon-so
期刊
Empirical mode decomposition (EMD) is an adaptive and approximately orthogonal filtering process that reflects human’s visual mechanism of differentiating textures. In this paper, we present a modifie
期刊
A class of quasi-cubic B-spline base functions by trigonometric polynomials are established which inherit properties similar to those of cubic B-spline bases. The corresponding curves with a shape par
期刊
The problem of parametric speed approximation of a rational curve is raised in this paper. Offset curves are widely used in various applications. As for the reason that in most cases the offset curves
期刊
A family of two-order Hermite vector-interpolating subdivision schemes is proposed and its convergence and con- tinuity are analyzed. The iterative level can be estimated for given error. The sufficie
期刊
Many graphics and computer-aided design applications require that the polygonal meshes used in geometric com- puting have the properties of not only 2-manifold but also are orientable. In this paper,
期刊
The problem of spherical parametrization is that of mapping a genus-zero mesh onto a spherical surface. For a given mesh, different parametrizations can be obtained by different methods. And for a cer
期刊
研究了有理曲线、曲面的隐式化问题,采用的是基于Bezout矩阵理论的方法.
期刊