著者
吉本 隆昭
出版者
陸戦学会
雑誌
陸戦研究
巻号頁・発行日
vol.48, no.557, pp.3-22, 2000-02
著者
玉田芳史編著
出版者
晃洋書房
巻号頁・発行日
2017
著者
菅英輝編著
出版者
晃洋書房
巻号頁・発行日
2017
著者
山中 隆 鹿嶋 雅之 佐藤 公則 渡邊 睦 緒方 淳
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)
巻号頁・発行日
vol.129, no.5, pp.792-799, 2009-05-01 (Released:2009-05-01)
参考文献数
11

Many researches have been done as for outdoor scene recognition by analyzing optical flow information. However, a practical driver-oriented system has not been proposed yet that notices the “Risk degree” when multiple obstacles exist, such as, parking cars and pedestrians. This article presents a new method to detect stand still obstacles using the “model flow” corresponding to optical flow field where there is no obstacle. The model flow is calculated using the knowledge as for navigation environments. Standard Points which are regularly set on image coordinates are transformed to Environment Points on road plane using several parameters such as, steering angle and camera tilt angle. Stand still objects are automatically detected by analyzing the difference between a model flow field and a real optical flow field which is acquired by an in-vehicle camera image. The algorithms have been installed in a desktop PC by Microsoft Visual C++6.0 programs. Experimental results by several kinds of outdoor scenes have shown the effectiveness of the proposed method. Total detection ratio is 91.0% and that in Dangerous case is 100%.
著者
辻 大亮 陶山 健仁
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)
巻号頁・発行日
vol.129, no.1, pp.79-86, 2009-01-01 (Released:2009-01-01)
参考文献数
16
被引用文献数
1

This paper presents a novel method for moving sound source localization and its performance evaluation in actual room environments. The method is based on the MUSIC (MUltiple SIgnal Classification) which is one of the most high resolution localization methods. When using the MUSIC, a computation of eigenvectors of correlation matrix is required for the estimation. It needs often a high computational costs. Especially, in the situation of moving source, it becomes a crucial drawback because the estimation must be conducted at every the observation time. Moreover, since the correlation matrix varies its characteristics due to the spatial-temporal non-stationarity, the matrix have to be estimated using only a few observed samples. It makes the estimation accuracy degraded. In this paper, the PAST (Projection Approximation Subspace Tracking) is applied for sequentially estimating the eigenvectors spanning the subspace. In the PAST, the eigen-decomposition is not required, and therefore it is possible to reduce the computational costs. Several experimental results in the actual room environments are shown to present the superior performance of the proposed method.
著者
西村 公宏
出版者
社団法人 日本造園学会
雑誌
造園雑誌 (ISSN:03877248)
巻号頁・発行日
vol.52, no.5, pp.19-24, 1988-03-31 (Released:2011-07-19)
参考文献数
22

大正後期から昭和初期にかけての, 中流階級を対象とした郊外住宅の競技設計に提出された住宅平面図には, 庭園が描かれてあるものがあり, その庭園は実用本位の庭園であった。この傾向はほぼ一貫しており, その根拠としては, 当初, 生活改善運動の一環として注目された実用庭園が, 不況から戦時下へと進む当時の日本の状況を許容するものであったことがあげられるであろう。