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流动显示和图像处理期刊
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN 打印: 1065-3090
ISSN 在线: 1940-4336

流动显示和图像处理期刊

DOI: 10.1615/JFlowVisImageProc.v11.i4.20
11 pages

AUTOMATIC RECOGNITION OF TWO-DIMENSIONAL VORTICES BY DIGITAL IMAGE PROCESSING

Shyh-Ming Sheu
Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, 701
Jung-Hua Chou
Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, 701

ABSTRACT

In this study, a digital image processing method has been developed to detect automatically the vortex structure behind a circular cylinder. The vortex recognition algorithm is based on the special features of a typical vortex; namely, the circular-like, elliptic-like, and/or the spiral-like characteristics extracted from the geometrical features of the vortex. The algorithm includes two parts; namely, pre-processing and vortex structure recognition. The results indicate that for a 256 × 240 image, all the vortices in the image can be detected in about 100 iterations if the noise level is low or moderate. But if the noise level is high and the pre-processing is poorly done, the algorithm is not reliable. The same situation occurs also if there are break points due to thinning or skeletonizing. These are the limitations of the present algorithm.


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