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Estimating fisheye camera parameters from homography

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Science China(Information Sciences) 2012年第9期55卷 2119-2127页

作者： ZHU HaiJiang 1,YANG Ping 2 & LI ShiGang 3 1 School of Information Science and Technology,Beijing University of Chemical Technology,Beijing,100029,China 2 National Institute of Metrology,100013,Beijing,China 3 Department of Electrical and Electronic Engineering,Tottori University,680-8552,koyama,Tottori,Japan School of Information Science and Technology Beijing University of Chemical Technology Beijing China National Institute of Metrology Beijing China Department of Electrical and Electronic Engineering Tottori University Koyama Tottori Japan

This paper presents a method to linearly estimate fisheye camera model parameters from the homography induced by the space plane between two fisheye *** homography is firstly calculated by using four feature points,instead of three points on the same line,in the fisheye *** the constraint on the model parameters of fisheye camera can be derived from the homography under the assumption that fisheye camera model is a polynomial *** the model parameters for different order polynomials are *** proposed technique requires only multiple fisheye images to include a planar scene and need not a priori knowledge of 3D coordinate of the planar *** results with synthetic data and real fisheye images demonstrate the validity of our *** method can also be extended to fisheye image of other planar scene excluding the planar calibration object.

关键词： homography parameter estimation fisheye camera

3D FLOW INSIDE BUBBLE-TYPE VORTEX BREAKDOWN: AN EXPERIMENTAL INVESTIGATION VIA LDV

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Journal of Hydrodynamics 2003年第3期15卷 44-48页

作者： LiuYing-zheng ChenHan-ping koyamaHideS SchoolofPowerandEnergyEngineering ShanghaiJiaotongUniversityShanzhai200030China DepartmentofMechanicalEngineering TokyoDenkiUniversityTokyo101-8457Japan

Bubble-type vortex breakdown of the swirling flow inside a closed cylindricalcontainer with a rotating upper endwall was experimentally investigated via LDV. 3D measurement ofthe steady bubble at H/R =1.5 was firstly carried out with very fine grid arrangement. Flow detailsinside the bubble and its Re -dependent structure were made clear. Abrupt waves of the azimuthalvelocity component were always found to be between the bottom stationary endwall and the upstreamstagnation point, which might be the reason of bubble formation. Variation of bubble structure andbubble center with the increasing Re gives the explanation for the disappearance of the breakdownregion.

关键词： bubble-type vortex breakdown LDV swirling flow

从KF-Li_2B_4O_7-Li_2MoO_4熔盐中平滑电积钼

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中国钼业 1992年第5期16卷 28-34页

作者： K.koyama 许孙曲

在1025～1173K温度范围和110～330A/m^2电流密度范围内,用电解法在KF-Li_2B_4O_7-Li_2MoO_4熔盐中的铜、镍、钼和不锈钢基体上沉积出粘附且目视平滑的钼镀层。这种镀层的硬度比由KF-B_2O_3-MoO_3,KF-B_2O_3-Na_2MoO_4,KF-B_2O_3-K_2MoO_4和KF-Na_2B_4O_7-Na_2MoO_4熔盐获得的平滑电积层低得多。既使采用石墨电解槽,也与用等离子体弧熔化工业用钼片制得的钼珠差不多或更低。采用石墨阳极也能获得平滑钼镀层,尽管含有少量Mo_2C。

关键词： KF Li2B4O7 Li2MoO4 电解沉积钼

用装在接触网上的传感器探测受电弓缺陷的方法

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国外铁道机车与动车 2017年第2期 30-34页

作者： Tatsuya koyama 刘志荣

受电弓缺陷可引起严重故障,导致接触网大面积损伤。因此,有必要开发一种早期探测这类缺陷的系统。该文作者们开发出一种探测方法,通过测量施加在3个邻近支柱定位器的轴向力,来探测受电弓典型缺陷——滑板沟槽型磨耗。因为这种方法只需测... 详细信息

受电弓缺陷可引起严重故障,导致接触网大面积损伤。因此,有必要开发一种早期探测这类缺陷的系统。该文作者们开发出一种探测方法,通过测量施加在3个邻近支柱定位器的轴向力,来探测受电弓典型缺陷——滑板沟槽型磨耗。因为这种方法只需测量3个邻近定位器的轴向力,所以可易于应用于运营线路。此外,还开发出一种适用于这种探测方法的系统,由动态应变放大器和数据遥测系统组成的小型、轻量又节电的数据采集装置构成。

关键词：受电弓滑板接触网探测方法数据采集装置定位器

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交互过渡空间的设计

现代装饰（家居） 2012年第9期 20-23页

作者： Akira koyama 陈雅男肖俊 KEY OPERATION INC

本案是对一套拥有20年历史的老旧公寓的改造个案,业主为一对夫妇和他们的孩子。从玄关而入,卫浴区与睡眠区之间的走道狭长且存有很多折角,结构中走道底部还没置有一扇门,用于区隔卫浴间、卧室与起居室,让整个空间在采光、交互功能上都... 详细信息

本案是对一套拥有20年历史的老旧公寓的改造个案,业主为一对夫妇和他们的孩子。从玄关而入,卫浴区与睡眠区之间的走道狭长且存有很多折角,结构中走道底部还没置有一扇门,用于区隔卫浴间、卧室与起居室,让整个空间在采光、交互功能上都存在极大的缺失。设计师对空间格局进行了大调整,改造的设计理念是将三大块彼此孤立的盒状空间——儿童房、供夫妻二人居住的两间卧室以及卫浴空间一一设置在整体空间内,并在这些块状体之间形成交互空间,让屋主得以在其间实现学习、工作及睡眠的自由转换。改造后,从入口步行至客厅,通过扩大如厕空间,减缩洗手间面积。

关键词：过渡空间儿童房卫浴间玄关卫浴空间整体空间功能空间黑板漆空间比折角

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茜草中两种萘醌

国际中医中药杂志 1994年第1期16卷 39-40页

作者： koyama-J 李宗友

从茜草(Rubia cordifolia)的甲醇提取物中得到两种新的萘醒,即2-氨基甲酰基-3-甲基-1,4-萘醒和2-氨基甲酰基-3-羟-1,4-萘醌。与此同时还分离到1种已知的萘醌去氢α-拉帕醌;1种已知的萘氢醌mollugin;6种已知的蒽醌,3-甲氧甲酰-1-羟蒽醌、... 详细信息

从茜草(Rubia cordifolia)的甲醇提取物中得到两种新的萘醒,即2-氨基甲酰基-3-甲基-1,4-萘醒和2-氨基甲酰基-3-羟-1,4-萘醌。与此同时还分离到1种已知的萘醌去氢α-拉帕醌;1种已知的萘氢醌mollugin;6种已知的蒽醌,3-甲氧甲酰-1-羟蒽醌、1,4-二羟-2-甲基蒽醌、1-羟-2-甲基

关键词：萘醌去氢甲基链烷基氮基氨基甲酰基茜草活血祛瘀药

Aquaporin 8 mRNA expression after intestinal resection in rat

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Open Journal of Gastroenterology 2014年第2期4卷 62-68页

作者： Yu koyama Hitoshi Kameyama Jun Sakata Takashi Kobayashi Masahiro Minagawa Shin-ichi Kosugi Tadashi Yamamoto Kohei Akazawa Toshifumi Wakai Department of Medical Informatics Niigata University Graduate School of Medical & Dental Sciences Niigata Japan Department of Renal Pathology Institute of Nephrology Niigata University Graduate School of Medical & Dental Sciences Niigata Japan Division of Digestive & General Surgery Niigata University Graduate School of Medical & Dental Sciences Niigata Japan

Backgrounds: Aquaporins (AQPs), the mammalian water channels, have been localized in various organs, including the gastrointestinal (GI) tract. We examined AQPs expression in rat models of massive intestineal resection to determine the functions of AQPs in the GI tract. Methods: Female Sprague-Dawley rats (n = 15) underwent 90% resection of the small intestine, and Female Wistar-Kyoto rats (n = 10), received subtotal colectomy, and were sacrificed following the operations. RNase protection assay and quantitative reverse transcription-polymerase chain reaction (RT-PCR) were performed to measure the AQPs mRNA expression in the GI tract. Immunohistochemistry was performed to confirm AQP8 protein expression. Results: AQP8 mRNA expression (mean ± standard error), was enhanced in the jejunum of the short bowel rats at days 7 and 14 (37.6% ± 1.4% and 18.5% ± 2.4%, respectively, p < 0.01). Enhancement of AQP8 mRNA was also observed in the remnant rectum of the subtotal colectomized rats at both days 21 and 42 (116.1% ± 4.5% and 143.3% ± 7.4%, respectively, p < 0.01). Immunohistochemistry demonstrated enhanced AQP8 expression in the remnant rectum of the subtotal colectomized rats. No intensive change was observed with other AQPs in both models. Conclusions: Our results suggest a compensatory role of AQP8 in the maintenance of intestinal fluid balance.

关键词： Aquaporin 8 Short Bowel Subtotal Colectomy RNase Protection Assay QuantitativeRT-PCR