日本地球惑星科学連合2018年大会

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[EE] Eveningポスター発表

セッション記号 B (地球生命科学) » B-AO 宇宙生物学・生命起源

[B-AO01] アストロバイオロジー

2018年5月22日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:薮田 ひかる(広島大学大学院理学研究科地球惑星システム学専攻)、杉田 精司(東京大学大学院理学系研究科地球惑星科学専攻)、深川 美里(名古屋大学、共同)、藤島 皓介(東京工業大学地球生命研究所)

[BAO01-P15] Screening candidates of unicellular organisms in microscopic images using machine learning

*園家 俊1出村 裕英1吉村 義隆2奥平 恭子1 (1.会津大学、2.玉川大学)

キーワード:顕微鏡画像、細胞、 機械学習

Characteristic classification of cells in microscopic images is an important technique in the fields of biotechnology, medical, space etc. In the above technique, it is important to extract only the focused cells from the microscopic image. Examples are the space missions Tanpopo [1] and STARDUST [2]. A large number of images are continuously captured in the depth direction by mechanically setting a constant reference. Manual searching by humans for a target object from a large amount of image group requires much labor. In this study, screening a single microscopic image. Automatic screening of a target object from a group of microscope images is very important in reducing labor.

This study uses the microscopic images of Life Detection Microscope (LDM) [3] as experimental data. The microscopic images of LDM are subjected to fluorescent dyeing treatment. The microscopic image is E.coli with reference to the density of microbes in Atacama Desert [4]. There are sparsely populated cells in the image, thus it is suitable to recognize each cell. Since cells are subjected to fluorescent staining treatment, it is easy to distinguish cells from others.

As a screening approach, machine learning using Convolutional Neural Network (CNN) [5], which is generally considered effective for image recognition, is used.
The CNN in this study is made in order to classify the cell in LDM’s microscopic image. The development language is Python [6], since Python has abundant machine learning frameworks. This study uses TensorFlow [7] as a framework. TensorFlow is a license-free machine learning library provided by Google.
Consequently, CNN was a valid approach in identification of the cell, but it cannot classify the focused cell or not.


References:
[1] Tokyo University of Pharmacy and Life Sciences, ‘TANPOPO Mission’, 2005.[Online]. http://www.ls.toyaku.ac.jp/~lcb-7/tanpopo/ [Accessed: 25-Jan-2018]
[2] NASA, “STARDUST mission”, 1999.[Online] https://stardust.jpl.nasa.gov/home/index.html
[3] A. Yamagishi et al, “LDM (Life Detection Microscope): In situ Imaging of Living Cells on Surface of Mars”, TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN Vol.14 2016 pages Pk_117-Pk_124
[4] Drees et al. Appl. Environ. Microbiol., 2006
[5] Y. LeCun, L. Bottou, Y. Bengio, and P. Haffner.
Gradient-based learning applied to document recognition. Proc. of the IEEE, pages 2278–2324,1998.
[6] Python https://www.python.org/ [Accessed: 25-Jan-2018]
[7] Google, “TensorFlow”,[Online] https://www.tensorflow.org/