基于SVDD和SVM的赤潮藻类识别

Red Tide Algae Recognition Based SVDD and SVM

提出了一种基于支持向量机(SVM)和支持向量域描述(SVDD)的赤潮藻类分类系统.该系统是赤潮藻类流式监测系统的子系统.设计这套系统的主要难点在于:1)同一种藻类的形态由于个体差异和生长期不同而不同;2)藻类图像是任意位置三维目标在成像平面的投影,投影存在任意性并可能产生局部遮挡;3)藻类图像包含非目标藻类和杂质.在特征提取算法的基础上,首先对输入的藻类采用SVDD进行拒识或接受处理,最后针对接受的藻类再利用基于超平面分割的SVM分类器进行分类判决.实验证明:基于SVM和SVDD的赤潮藻类分类系统分类精度更高并具有较好的拒识性能,是一种较好的藻类自动分类方法.

This paper presents a real-time alga classifier designed for flow-cytometry-based marine alga monitoring systems. The difficulties of such classification includes： 1）the shape of the same algae category is deformable,and largely variant due to the individual differences and mature stage, 2）the image of algae may vary due to different 3D positions to the imaging plane and partial occlusion, 3）the images also contain unknown algae and contaminations. In the proposed method,several shape features were developed,support vector data deseription（SVDD） was trained to reject the contaminative objects and unknown algae and a support vector machine （SVM） was used to classify the algae to taxonomic categories. Our approach achieved greater than 90~ accuracy on a collection of algal images. The test on contaminated algal image set（ contains unknown algae and non-algae objects, such as sands） also demonstrated promising results.