Region-shrinking: A hybrid segmentation technique for isolating continuous features, the case of oceanic eddy detection

REMOTE SENSING OF ENVIRONMENT

卷:153

Article

Wu, Qingling¹ 

[1] Clark Univ, Grad Sch Geog, Worcester, MA 01610 USA

关键词: Segmentation;    Object based image analysis;    Fuzzy objects;    Oceanic eddies;    Okubo-Weiss parameter;    Sea level anomaly;    AVISO;   

DOI  :  10.1016/j.rse.2014.07.026

来源: Elsevier

【 摘 要 】

In remote sensing image analysis, limited attention has been devoted to the isolation of fuzzy objects, namely those with inherently indeterminate boundaries, from continuous field data. This study develops a region-shrinking segmentation technique tailored specifically to the problem of fuzzy object identification, and applies it to the test case of oceanic eddy detection. The region-shrinking technique employs an evolutionary boundary definition procedure to simultaneously identify segments containing oceanic eddies, and refine the boundaries of these segments to correspond to eddy perimeters. This algorithm combines a Non-Euclidean Voronoi segmentation technique with insights from existing work on eddy detection from an oceanographic perspective, with the goal of improving the detection of eddy features through sea level anomaly imagery. It takes into account multiple criteria (vorticity, size, amplitude, the existence of local sea level extrema, concave or convex shape) to iteratively refine the identification and demarcation of oceanic eddies. The resulting polygons define tightly fitted eddy boundaries, and conform to the key rotational and cross-sectional height profile characteristics used by physical oceanographers to identify eddies. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

Free