G843.2 20030376青少年足球运动员的速度力量训练=A probe into thetraining of juvenile football players’speed andstrength[刊,中,I]／杨大强(河南省安阳市体育运动学校)∥体育函授通讯.-2002,18(3).-84-85参3(TY)
This paper presents a practical iterative algorithm for two-view metric reconstruction without any prior knowledge about the scene and motion in a nonsingular geometry configuration. The principal point is assumed to ...This paper presents a practical iterative algorithm for two-view metric reconstruction without any prior knowledge about the scene and motion in a nonsingular geometry configuration. The principal point is assumed to locate at the image center with zero skew and the same aspect ratio, and the interior parameters are fixed, so the self-calibration becomes focal-length cali- bration. Existing focal length calibration methods are direct solutions of a quadric composed of fundamental matrix, which are sensitive to noise. A quaternion-based linear iterative Least-Square Method is proposed in this paper, and one-dimensional searching for optimal focal length in a constrained region instead of solving optimization problems with inequality constraints is applied to simplify the computation complexity, then unique rotational matrix and translate vector are recovered. Experiments with simulation data and real images are given to verify the algorithm.展开更多
基于CiteSpace可视化工具对从Web of Science核心数据库中获取的近20年667篇汉语阅读障碍研究文献进行可视化计量分析。结果表明,汉语阅读障碍研究起步较晚,但发展迅速;我国大陆及香港地区的汉语阅读障碍研究在国际上有较高影响力,拥有...基于CiteSpace可视化工具对从Web of Science核心数据库中获取的近20年667篇汉语阅读障碍研究文献进行可视化计量分析。结果表明,汉语阅读障碍研究起步较晚,但发展迅速;我国大陆及香港地区的汉语阅读障碍研究在国际上有较高影响力,拥有众多具有科研实力的机构及学者;汉语的阅读障碍研究主要围绕儿童阅读发展及发展性阅读障碍相关的话题展开;当前研究主要关注视觉注意广度或语法技能与阅读障碍的关系。展开更多
文摘G843.2 20030376青少年足球运动员的速度力量训练=A probe into thetraining of juvenile football players’speed andstrength[刊,中,I]／杨大强(河南省安阳市体育运动学校)∥体育函授通讯.-2002,18(3).-84-85参3(TY)
文摘This paper presents a practical iterative algorithm for two-view metric reconstruction without any prior knowledge about the scene and motion in a nonsingular geometry configuration. The principal point is assumed to locate at the image center with zero skew and the same aspect ratio, and the interior parameters are fixed, so the self-calibration becomes focal-length cali- bration. Existing focal length calibration methods are direct solutions of a quadric composed of fundamental matrix, which are sensitive to noise. A quaternion-based linear iterative Least-Square Method is proposed in this paper, and one-dimensional searching for optimal focal length in a constrained region instead of solving optimization problems with inequality constraints is applied to simplify the computation complexity, then unique rotational matrix and translate vector are recovered. Experiments with simulation data and real images are given to verify the algorithm.
文摘基于CiteSpace可视化工具对从Web of Science核心数据库中获取的近20年667篇汉语阅读障碍研究文献进行可视化计量分析。结果表明,汉语阅读障碍研究起步较晚,但发展迅速;我国大陆及香港地区的汉语阅读障碍研究在国际上有较高影响力,拥有众多具有科研实力的机构及学者;汉语的阅读障碍研究主要围绕儿童阅读发展及发展性阅读障碍相关的话题展开;当前研究主要关注视觉注意广度或语法技能与阅读障碍的关系。
