计算机应用 ›› 2019, Vol. 39 ›› Issue (9): 2719-2725.DOI: 10.11772/j.issn.1001-9081.2019020364

• 虚拟现实与多媒体计算 • 上一篇    下一篇

用于灰度不均图像分割的自适应灰度拟合模型

张栩源, 王艳   

  1. 重庆师范大学 数学科学学院, 重庆 401331
  • 收稿日期:2019-03-06 修回日期:2019-05-24 出版日期:2019-09-10 发布日期:2019-06-17
  • 通讯作者: 王艳
  • 作者简介:张栩源(1993-),男,湖南常德人,硕士研究生,主要研究方向:图像处理的偏微分方程方法;王艳(1984-),女,山东青岛人,副教授,博士,主要研究方向:图像处理的偏微分方程方法。
  • 基金资助:

    重庆市教委科学技术研究项目(KJQN201800537);重庆师范大学国家基金预研项目(16XYY21,16XYY23);重庆师范大学博士启动基金资助项目(17XLB001)。

Adaptive intensity fitting model for segmentation of images with intensity inhomogeneity

ZHANG Xuyuan, WANG Yan   

  1. School of Mathematical Sciences, Chongqing Normal University, Chongqing 401331, China
  • Received:2019-03-06 Revised:2019-05-24 Online:2019-09-10 Published:2019-06-17
  • Supported by:

    This work is partially supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (KJQN201800537), the National Fund Pre-research Project of Chongqing Normal University (16XYY21, 16XYY23), the Doctor Start-up Foundation of Chongqing Normal University (17XLB001).

摘要:

针对灰度不均图像的分割问题,提出了一个结合全局信息的局部区域自适应灰度拟合模型。首先,分别利用图像的局部和全局信息构造了局部拟合项和全局拟合项;其次,利用像素点邻域内灰度的极差反映该点邻域内灰度的偏差程度,并以此定义了一个自适应权值函数;最后,利用定义的权值函数为局部项和全局项自适应赋权值,得到所提模型的能量泛函,并使用变分法推导出模型的水平集函数迭代方程。数值实现采用有限差分法。实验结果表明,与区域可变灰度拟合(RSF)模型和局部和全局灰度拟合(LGIF)模型相比,所提模型不仅能够稳定、准确地分割多种灰度不均图像,而且对演化曲线初始轮廓的位置、大小和形状具有更强的鲁棒性。

关键词: 图像分割, 自适应权值, 局部区域信息, 灰度不均图像, 水平集方法

Abstract:

For the segmentation of images with intensity inhomogeneity, a region-adaptive intensity fitting model combining global information was proposed. Firstly, the local and global terms were constructed based on local and global image information respectively. Secondly, an adaptive weight function was defined to indicate the deviation degree of the gray scale of a pixel neighborhood by utilizing the extreme difference level in the pixel neighborhood. Finally, the defined weighting function was used to assign weights to local and global terms adaptively to obtain the energy functional of the proposed model and the iterative equation of the model's level set function was deduced by the variational method. The experimental results show that the proposed model can segment various inhomogeneous images stably and accurately in comparison with Region-Scalable Fitting (RSF) model and Local and Global Intensity Fitting (LGIF) model, which is more robust in the position, size and shape of initial contour of evolution curve.

Key words: image segmentation, adaptive weight, local region information, intensity inhomogeneous image, level set method

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