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College of Information Science and Engineering Ocean University of China
网络首发:2016-05-10,
纸质出版:2017
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Automatic cell object extraction of red tide algae in microscopic images[J]. 海洋湖沼学报(英文), 2017,35(2):275-293.
Yu, K., Ji, G. & Zheng, H. Automatic cell object extraction of red tide algae in microscopic images., Chin. J. Ocean. Limnol. 35, 275–293 (2017). https://doi.org/10.1007/s00343-016-5324-6
Automatic cell object extraction of red tide algae in microscopic images[J]. 海洋湖沼学报(英文), 2017,35(2):275-293. DOI: 10.1007/s00343-016-5324-6.
Yu, K., Ji, G. & Zheng, H. Automatic cell object extraction of red tide algae in microscopic images., Chin. J. Ocean. Limnol. 35, 275–293 (2017). https://doi.org/10.1007/s00343-016-5324-6 DOI:
Extracting the cell objects of red tide algae is the most important step in the construction of an automatic microscopic image recognition system for harmful algal blooms. This paper describes a set of composite methods for the automatic segmentation of cells of red tide algae from microscopic images. Depending on the existence of setae
we classify the common marine red tide algae into non-setae algae species and Chaetoceros
and design segmentation strategies for these two categories according to their morphological characteristics. In view of the varied forms and fuzzy edges of non-setae algae
we propose a new multi-scale detection algorithm for algal cell regions based on border- correlation
and further combine this with morphological operations and an improved GrabCut algorithm to segment single-cell and multicell objects. In this process
similarity detection is introduced to eliminate the pseudo cellular regions. For Chaetoceros
owing to the weak grayscale information of their setae and the low contrast between the setae and background
we propose a cell extraction method based on a gray surface orientation angle model. This method constructs a gray surface vector model
and executes the gray mapping of the orientation angles. The obtained gray values are then reconstructed and linearly stretched. Finally
appropriate morphological processing is conducted to preserve the orientation information and tiny features of the setae. Experimental results demonstrate that the proposed methods can effectively remove noise and accurately extract both categories of algae cell objects possessing a complete shape
regular contour
and clear edge. Compared with other advanced segmentation techniques
our methods are more robust when considering images with different appearances and achieve more satisfactory segmentation effects.
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