An improved region-based model with local statistical features for image segmentation

Authors:
Qi Ge;Liang Xiao;Jun Zhang;Zhi Hui Wei
Affiliations:
School of Computer, Nanjing University of Science and Technology, Nanjing Jiangsu 210094, China;School of Computer, Nanjing University of Science and Technology, Nanjing Jiangsu 210094, China;School of Science, Nanjing University of Science and Technology, Nanjing Jiangsu 210094, China;School of Computer, Nanjing University of Science and Technology, Nanjing Jiangsu 210094, China
Venue:
Pattern Recognition
Year:
2012

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Abstract

In this paper, we propose a new region-based active contour model (ACM) for image segmentation. In particular, this model utilizes an improved region fitting term to partition the regions of interests in images depending on the local statistics regarding the intensity and the magnitude of gradient in the neighborhood of a contour. By this improved region fitting term, images with noise, intensity non-uniformity, and low-contrast boundaries can be well segmented. Integrated with the duality theory and the anisotropic diffusion process based on structure tensor, a new regularization term is defined through the duality formulation to penalize the length of active contour. By this new regularization term, the structural information of images is utilized to improve the ability of capturing the geometric features such as corners and cusps. From a numerical point of view, we minimize the energy function of our model by an efficient dual algorithm, which avoids the instability and the non-differentiability of traditional numerical solutions, e.g. the gradient descent method. Experiments on medical and natural images demonstrate the advantages of the proposed model over other segmentation models in terms of both efficiency and accuracy.