著者

岡田 龍司 徳安 秀政 岡崎 祐史 山内 直人 穴井 隆将 松田 基子 矢崎 利加 田辺 陽子 倉賀野 哲造

出版者

Japanese Academy of Budo

雑誌

武道学研究 (ISSN:02879700)

巻号頁・発行日

vol.47, pp.45-45, 2014

著者

岡田 龍司 村本 辰寛 徳安 秀正 岡崎 祐史 穴井 隆将 倉賀野 哲造

出版者

近畿大学教養・外国語教育センター

雑誌

近畿大学教養・外国語教育センター紀要. 一般教養編 = Kinki university center for liberal arts and foreign language education journal. Liberal arts edition (ISSN:24322814)

巻号頁・発行日

vol.6, no.1, pp.13-21, 2016-03-31

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“Uchi-mata” difference was discovered by using available motion pictures.The motion pictures were disassembled into frame data called AVI,which is a file format for storing audio and video information developed by Microsoft Corp.The motions performed by participants while using Judo standin “ Uchimata” were analyzed using a software system based on “Open CV”,which is an open source library for computer vision and image processing developed by Intel Corp.The positions of parts of the body were indicated manually on to the AVI pictures based on the “frame by frame playback” technique, then put into a computer. The compensation of pixel values to the real space size was performed by using the known length of the“ tatami” in the AVI picture.By repeating these,the positions of the body were traced corresponding to the frame rate.The compensated positional data of the body was gathered and then disassembled into x direction-time data and y direction-time data to calculate velocity. In this manner,the velocity of the specified body parts of the thrown opponent were calculated.The subjects selected were two leading Judo men.When he threw his opponent down,his motion of his stand technique of“ Uchi-mata” was analyzed.This is a case study of motion analysis of Judo using available motion pictures.We have given an example of an analysis method for Judo from an engineering point of view.

著者

岡田 龍司 村元 辰寛 徳安 秀正 岡崎 祐史 穴井 隆将 倉賀野 哲造

出版者

近畿大学教養・外国語教育センター

雑誌

教養・外国語教育センター紀要. 一般教養編 Kinki University, Center for Liberal Arts and Foreign Language Education journal (ISSN:24322814)

巻号頁・発行日

vol.6, no.1, pp.13-21, 2016

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"Uchi-mata" difference was discovered by using available motion pictures.The motion pictures were disassembled into frame data called AVI,which is a file format for storing audio and video information developed by Microsoft Corp.The motions performed by participants while using Judo standin " Uchimata" were analyzed using a software system based on "Open CV",which is an open source library for computer vision and image processing developed by Intel Corp.The positions of parts of the body were indicated manually on to the AVI pictures based on the "frame by frame playback" technique, then put into a computer. The compensation of pixel values to the real space size was performed by using the known length of the" tatami" in the AVI picture.By repeating these,the positions of the body were traced corresponding to the frame rate.The compensated positional data of the body was gathered and then disassembled into x direction-time data and y direction-time data to calculate velocity. In this manner,the velocity of the specified body parts of the thrown opponent were calculated.The subjects selected were two leading Judo men.When he threw his opponent down,his motion of his stand technique of" Uchi-mata" was analyzed.This is a case study of motion analysis of Judo using available motion pictures.We have given an example of an analysis method for Judo from an engineering point of view.

著者

横倉 三郎 梶原 洋子 倉賀野 哲造

出版者

明星大学情報学部研究紀要編集委員会

雑誌

明星大学研究紀要【情報学部】 (ISSN:13444379)

巻号頁・発行日

no.22, pp.53-59, 2014-03-15

著者

黒田 満 倉賀野 哲造 久保 哲夫

出版者

一般社団法人情報処理学会

雑誌

情報処理学会論文誌 (ISSN:18827764)

巻号頁・発行日

vol.39, no.3, pp.602-609, 1998-03-15

参考文献数

14

被引用文献数

3

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曲率半径が弧長の折れ線グラフとなる滑らかな対数らせんスプライン補間曲線の導出法を提案している.曲線はスパン曲線長,与点での曲率半径と接線を未知数とする連立方程式を,パラメトリック3次のC2補間曲線からの良い初期値を使ってニュートン・ラプソン法で解いて導く.提案手法は計算機援用の形状設計に有用な次の特長を持っている.(1)弧長,接線,曲率半径といって,設計者の直観になじむ幾何情報だけから形状を設計・制御できる.(2)縮閉線がまた対数らせんスプライン曲線となるし,オフセット曲線と伸開線も対数らせんスプライン曲線で精度良く近似できるので取り扱いやすい.(3)必要なら,導出曲線を許容誤差範囲内で有理多項式近似できる.さらに,クロソイド弧の挿入による変曲点の導入や1スパンを複数曲線分化して表現力を強化する拡張法についても簡単に述べている.This paper presents a method for constructing an interpolating smooth curve composed of logarithmic spirals,whose radius of curvature is piecewise linear with respect to arclength.Using good initial values from the conventional cubic C2 interpolant,the curve is obtained by the Newton-Raphson method from a system of equations whose unkowns are arclengths of spans,tangents and curvature radii at data points.The method has the following three features for computer aided geometric design.(1)It specifies and controls shape of curve by intrinsic geometric quantities familiar with designers,such as arclength,tangent and radius curvature.(2)Its evolute is also expressed by logarithmic spiral splinecurve,and its offset curve and involute are approximated very well by logarithmic spiral spline curve and hence these associate curves are easy to deal with.(3)The derived cruve might be approximated within a tolerance by conventional rational polynomials,if necessary.Extensions of the method are described for introducing an inflection point by use of a clothoid segment and for making the curve more flexible by multi segments per span.

著者

倉賀野 哲造

出版者

明星大学情報学部研究紀要編集委員会

雑誌

明星大学研究紀要【情報学部】 (ISSN:13444379)

巻号頁・発行日

no.21, pp.1-10, 2013-03-15