Adjacency stable connected operators and set levelings

This paper studies morphological connected operators. Particularly, it focuses on an adjacency constraint, as well as on the so-called set levelings. Some important findings are reported in this work. First, the relationships between the so-called adjacency stable operators and set levelings are investigated, and an equivalence is established. This permits to apply some properties to the related operator class. Second, the implications and limits of a property presented elsewhere that states that certain connected operators can be expressed as a sequential composition of an opening and a closing (and vice-versa) based on markers are treated. Then, a commutative property that involves alternated attribute filters is presented. In addition, other related expressions are discussed.     

一类多结构元自适应广义形态滤波器

基于广义形态开—闭和闭—开运算，采用多种结构元和自适应加权平均技术，定义了一类新型形态滤波器。这类滤波器不仅可以有效地抑制图象中的噪声，而且较好地保持了图象的几何特征。滤波器计算简单，便于实时并行处理。     

文档处理中背景字符的去除

识别域图像的提取是文档自动处理系统中一个重要的预处理过程。在实际应用中,用户填写的信息常常与版面中的框线和背景字符存在交叠现象,严重影响了系统的性能。本文提出了基于点边距离分析的背景字符去除算法。首先通过灰度图像匹配的方法精定位背景字符子图像;然后利用形态学方法结合笔画的宽度信息对背景字符子图像进行二值化;最后分析像素点到边界距离的变化确定需要填充的像素位置,并通过形态学方法计算像素的填充值。实验采用了真实票据图像中的日期域,实验结果表明本文的方法获得了基本令人满意的效果,背景字符像素被成功去除。