| 光谱学与光谱分析 |
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| An Object-Oriented Remote Sensing Image Segmentation Approach Based on Edge Detection |
| TAN Yu-min1，HUAI Jian-zhu1，TANG Zhong-shi2 |
1. School of Transportation Science & Engineering, Beihang University, Beijing 100191, China
2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Satellite sensor technology endorsed better discrimination of various landscape objects. Image segmentation approaches to extracting conceptual objects and patterns hence have been explored and a wide variety of such algorithms abound. To this end, in order to effectively utilize edge and topological information in high resolution remote sensing imagery, an object-oriented algorithm combining edge detection and region merging is proposed. Susan edge filter is firstly applied to the panchromatic band of Quickbird imagery with spatial resolution of 0.61 m to obtain the edge map. Thanks to the resulting edge map, a two-phrase region-based segmentation method operates on the fusion image from panchromatic and multispectral Quickbird images to get the final partition result. In the first phase, a quad tree grid consisting of squares with sides parallel to the image left and top borders agglomerates the square subsets recursively where the uniform measure is satisfied to derive image object primitives. Before the merger of the second phrase, the contextual and spatial information, (e.g., neighbor relationship, boundary coding) of the resulting squares are retrieved efficiently by means of the quad tree structure. Then a region merging operation is performed with those primitives, during which the criterion for region merging integrates edge map and region-based features. This approach has been tested on the QuickBird images of some site in Sanxia area and the result is compared with those of ENVI Zoom and Definiens. In addition, quantitative evaluation of the quality of segmentation results is also presented. Experiment results demonstrate stable convergence and efficiency.
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Received: 2010-02-08
Accepted: 2010-05-12
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Corresponding Authors:
TAN Yu-min
E-mail: tanym@buaa.edu.cn
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