Journal of Geo-information Science >
Multi-scale Segmentation of High-resolution Remote Sensing Image Based on Improved Watershed Transformation
Received date: 2013-04-02
Revised date: 2013-05-02
Online published: 2014-01-05
With the development of high resolution remote sensing images, imaging analysis technology of object-oriented method shows a distinct advantage in the field of information extraction and target recognition. Image segmentation, as a key technology of object-oriented image analysis method, has a vital role to play on the latter feature extraction and application analysis. Watershed transformation is usually adopted for image segmentation because of its unique advantages. However, because of the complexities of high spatial resolution remote sensing image itself, the traditional method of watershed segmentation is difficult to obtain satisfactory results. This paper presents a new multi-scale segmentation method for high resolution remote sensing image based on improved watershed transformation, in order to suppress over-segmentation of watershed transformation, as well as to provide arbitrary-scale segmentation of remote sensing image for object-oriented segmentation method. The algorithm fully considered multi-spectrum, multi-scale and multi-noises characteristics of high spatial resolution remote sensing image. The details are described as follows. Firstly, an anisotropic diffusion filter was used for image smoothing, because this technology can both remove the noises and maintain edges and other important details information of the input image. Secondly, in order to take into account the multi-scale characteristics of remote sensing images, multi-scale morphology gradient was extracted because of its good combination of the advantages of large structural element and small structural element, and then H-minima technology was used to extract tags of gradient image for the latter marker-based watershed algorithm. Finally, an improved fast region-merging algorithm was proposed to achieve the multi-scale segmentation. This paper elaborated the pre-processing filtering, multi-scale gradient, marking extraction and multi-scale region merging aspects, and the experiments showed that the proposed segmentation method effectively restrained over-segmentation of watershed transformation, and had a good performance for segmentation of high spatial resolution remote sensing images.
ZHANG Bo, HE Binbin . Multi-scale Segmentation of High-resolution Remote Sensing Image Based on Improved Watershed Transformation[J]. Journal of Geo-information Science, 2014 , 16(1) : 142 -150 . DOI: 10.3724/SP.J.1047.2014.00142
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