农业机械学报2018，Vol.49Issue(2)：327-333,7.DOI:10.6041/j.issn.1000-1298.2018.02.042
基于图谱特征的番茄种子活力检测与分级
Detection and Classification of Tomato Seed Vitality Based on Image Processing
摘要
Abstract
Precision seeding put forward higher requirements for the seed quality.However,existing grading methods of seeds are destructive and unsuitable for sorting seeds based on internal characteristics,and a classification method based on the seed vitality is required.An algorithm of image acquisition and characteristics identification and classification of tomato seeds was proposed based on hyperspectral technique and image processing technology.Totally 170 grains of tomato seeds were randomly selected as the research object,and the ratio of calibration set and validation set was about 3∶ 1.Images of tomato seeds were collected by hyperspectral acquisition system which was composed of high performance lighting CCD camera,line scanning spectrometer,oriel instruments,image acquisition card and computer.The resolution of the camera and range of spectrometer were respectively 1 376 pixels × 1 040 pixels and 400 ～ 1 100 nm.An average spectrum of interest region of each seed could be obtained.Then the results of seed vigor were obtained from the standard germination test.And the characteristic wavelengths of tomato seed vigor were acquired by successive projections algorithm (SPA),including 535 nm,577 nm,595 nm,654 nm,684 nm,713 nm,744 nm,768 nm,809 nm and 840 nm.The images under above characteristic wavelengths were preprocessed by bilateral filtering,Ostu and morphological transformation to gain the seed eigenvalues including area,circularity and average gray.The classification thresholds were calculated according to the eigenvalues and vitality results of the calibration set based on statistical regularity,and prediction analysis of validation set was carried out.The results showed that both of average of area and gray had significant difference between viable seeds and non-viable seeds,while the difference of circularity between viable seeds and non-viable seeds was insignificant.Classification accuracy of calibration and validation sets was above 85％ in eight characteristics wavelengths.And 713 nm gave the best result,the accuracy of the calibration and validation set were 93.75％ and 90.48％,respectively.The results provided a new method for rapid nondestructive grading of tomato seeds,and lay the foundation for the development of tomato seed grading equipment based on seed vitality.关键词
番茄种子/活力/高光谱/图像处理Key words
tomato seeds/vitality/hyperspectral/image processing分类
农业科技引用本文复制引用
彭彦昆,赵芳,白京,郑晓春,王文秀,孙群..基于图谱特征的番茄种子活力检测与分级[J].农业机械学报,2018,49(2):327-333,7.基金项目
国家重点研发计划项目(2017YFD0701205)和北京市科技计划项目(Z151100001015004) （2017YFD0701205）
