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Region-of-interest extraction in low depth of field images using ensemble clustering and difference of Gaussian approaches

Published: 01 October 2013 Publication History

Abstract

In this paper, a two-stage unsupervised segmentation approach based on ensemble clustering is proposed to extract the focused regions from low depth-of-field (DOF) images. The first stage is to cluster image blocks in a joint contrast-energy feature space into three constituent groups. To achieve this, we make use of a normal mixture-based model along with standard expectation-maximization (EM) algorithm at two consecutive levels of block size. To avoid the common problem of local optima experienced in many models, an ensemble EM clustering algorithm is proposed. As a result, relevant blocks closely conforming to image objects are extracted. In stage two, a binary saliency map is constructed from the relevant blocks at the pixel level, which is based on difference of Gaussian (DOG) and binarization methods. Then, a set of morphological operations is employed to create the region-of-interest (ROI) from the map. Experimental results demonstrate that the proposed approach achieves an F-measure of 91.3% and is computationally 3 times faster than the existing state-of-the-art approach.

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Information & Contributors

Information

Published In

cover image Pattern Recognition
Pattern Recognition  Volume 46, Issue 10
October, 2013
236 pages

Publisher

Elsevier Science Inc.

United States

Publication History

Published: 01 October 2013

Author Tags

  1. Difference of Gaussian method
  2. Ensemble clustering
  3. Expectation-maximization algorithm
  4. Low depth-of-field
  5. Region-of-interest extraction

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