著者

内舘 光邦 齋藤 秀樹 竹岡 政治

出版者

応用森林学会

雑誌

日本林学会関西支部論文集 (ISSN:09182268)

巻号頁・発行日

vol.1, pp.215-218, 1992-05-31 (Released:2018-01-23)

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In order to determine changes in the annual production of pollen by Sugi (Cryptomeria Japonica D. Don) stands with increasing age, five stands ranging in age from a planted 37-yr-old stand to one about 600 yr old in the grounds of a Buddhist temple were studied. Pollen production rates were estimated from the number of fallen male flowers in a stand by the litter trap method and the quantity of pollen per flower sampled before anthesis. The relationship between the number of fallen male flowers in a atand and stand age showed a ceiling curve, indicating a constant upper limit for several hundred years after the age of 50 yr. This minimum stand age of 50 yr, after which a constant value of pollen was produced, was quoted from findings obtained in our previous study. The data indicate that an increase of pollen dispersal per unit land area if the final cutting age of Sugi forests is increased to as much as 120-150 yr is improbable. In 1990, the production rate in the five study stands was estimated to be 4.3-52×10^<12> pollen grains ha-<-1>yr^<-1>, or 43-360kg d. w. ha^<-1> yr^<-1>,

著者

内舘 光 猪田 良介 辻 俊明 阿部 茂

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.129, no.6, pp.578-584, 2009-06-01 (Released:2009-06-01)

参考文献数

18

被引用文献数

2 5

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This paper proposes a real-time image processing system for wheelchair recognition at elevator lobby. This system extracts objects with frame difference method. From the image of extracted objects, heads of people are detected by the Hough transform. Vertical shooting from ceiling improves the performance of people counting since the detected head has high roundness and occlusion of people is prevented. Two feature quantities are introduced to recognize wheelchairs. They are the area value and the ratio of traveling length to vertical length. Since these quantities require a method for drawing the contour line. This paper proposes a new simple method to draw a contour line. The effectiveness of this system is confirmed through experiments.