Bilevel thresholding of sliced image of sludge floc

被引:23
作者
Chu, CP [1 ]
Lee, DJ [1 ]
机构
[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 10617, Taiwan
关键词
D O I
10.1021/es034732d
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work examined the feasibility of employing various thresholding algorithms to determining the optimal bilevel thresholding value for estimating the geometric parameters of sludge flocs from the microtome sliced images and from the confocal laser scanning microscope images. Morphological information extracted from images depends on the bilevel thresholding value. According to the evaluation on the luminescence-inverted images and fractal curves (quadric Koch curve and Sierpinski carpet), Otsu's method yields more stable performance than other histogram-based algorithms and is chosen to obtain the porosity. The maximum convex perimeter method, however, can probe the shapes and spatial distribution of the pores among the biomass granules in real sludge flocs. A combined algorithm is recommended for probing the sludge floc structure.
引用
收藏
页码:1161 / 1169
页数:9
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