基于小波域TS-MRF模型的监督图像分割方法
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

国家重点基础研究发展计划(973计划),国家高技术研究发展计划(863计划)


Supervised image segmentation method based on tree-structured Markov random field in wavelet domain
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    定义在单一空间分辨率上的树结构马尔可夫场(Tree-Structured Markov Random Field, TS-MRF)模型能够表达图像的分层结构信息, 但难以描述图像的非平稳性.针对该问题, 提出小波域的TS-MRF图像建模方法—WTS-MRF模型.按照图像分类层次树的结构形式, 该模型将一系列的MRF嵌套定义在多分辨率的小波域中: 每一个树节点对应于定义在不同分辨率上的一个MRF集合, 并通过条件概率的形式将相邻分辨率上的MRF间的作用关系考虑进来; 同时相同分辨率的父子节点对应的MRF通过区域约束嵌套定义.基于WTS-MRF模型, 给出了一个监督图像分割的递归算法, 通过给定的分类层次树表示先验信息, 并通过训练数据给出叶子节点在各分辨率上的统计参数.它在尺度内和尺度间两个层次上进行递归: 首先, 在最低分辨率上执行尺度内递归, 即采用ICM算法从树的根节点到叶子节点依次对MRF进行递归估计; 然后执行尺度间递归, 即在相邻的更高分辨率尺度上, 通过直接投影的方式依次获取每一MRF的初始估计, 并采用ICM算法递归优化; 最后, 原始分辨率的MRF估计完成, 获取最终分割结果.两组实验从视觉效果和定量指标(整体分类正确率和Kappa系数)两个方面验证了算法的有效性.

    Abstract:

    The tree-structured Markov Random Field (TS-MRF) model defined on a single spatial resolution, which is capable of expressing the hierarchical structure implied in the image to be segmented, fails to describe its non-stationary property. In order to solve this problem, a new image modeling method in Wavelet domain—WTS-MRF was proposed. In this model, a sequence of MRFs were hierarchically defined in the format of the classification tree structure. Each node was associated with a set of MRFs defined on different resolutions, wherein the correlation between neighbor MRFs with different resolutions was considered in the form of conditional probability. The child MRF was nested in the region of the parent one on the same resolution. Based on the WTS-MRF model, a supervised recursive segmentation algorithm was proposed. The classification hierarchical tree was manually set as the priori information, and the corresponding statistics for each leaf node were obtained by the training data on each resolution. The implementation of this algorithm was both on the inner-scale and inter-scale level. The inner-scale recursion was executed on the lowest resolution, where the MRF corresponding to each node was sequentially and recursively estimated by the ICM algorithm from the root to leaves. The inter-scale recursion was implemented on the next finer resolution, in which the estimation of MRFs was sequentially initialized by the direct projection from the next lower resolution and recursively refined by the ICM algorithm. The final segmentation was obtained when the MRFs were estimated on the primary resolution. Two experiments verify the validity of the proposed method in terms of both visual quality and quantitative indicators (e.g. overall accuracy and Kappa coefficient).

    参考文献
    相似文献
    引证文献
引用本文

刘国英,王爱民,陈荣元,秦前清.基于小波域TS-MRF模型的监督图像分割方法[J].红外与毫米波学报,2011,30(1):91~96]. LIU Guo-Ying, WANG Ai-Min, CHEN Rong-Yuan, QIN Qian-Qing. Supervised image segmentation method based on tree-structured Markov random field in wavelet domain[J]. J. Infrared Millim. Waves,2011,30(1):91~96.]

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2009-02-20
  • 最后修改日期:2009-02-21
  • 录用日期:2009-08-31
  • 在线发布日期: 2011-02-24
  • 出版日期:
文章二维码