基于感兴趣区梯度方向直方图的行人检测

针对以梯度方向直方图作为人体特征的行人检测存在向量维数较大、检测时间较长的问题,提出基于感兴趣区梯度方向直方图的行人检测方法,分别在头部及四肢等重点区域计算梯度方向直方图,有效地减少了向量维数。实验结果表明,该方法在检测率基本不变的情况下提高了检测速度。     

一种基于受限约束范围标签传播的半监督学习算法

提出一种基于受限约束范围标签传播的半监督学习算法。首先利用相似性矩阵计算得出概率转移矩阵,进而通过概率转移矩阵得出受限约束范围。然后在约束范围内利用半监督学习框架下的标签传播算法计算基于路径的相似性,路径相似性决定了标签传播的重要路径。由于只使用几条重要的传播路径使得算法中省去计算每一条路径的相似度,计算复杂度大大减少。最终使得标签在带标签数据与未标签数据之间通过几条重要的路径之间传播。实验已经证明此算法的有效性。     

二值图像中标定目标区域的几何特征提取

本文论述了采用标答处理对二值图像中感兴趣目标区域的标定方法,给出了几种常用几何形状特征的提取方法,提出了一种通用性较强、便于提高取被选定目标区域的外边界轮廓和几何形状特征的边界跟踪算法。实验表明,该算法对含有洞的区域也是行之有效的。     

Identification and sizing of the entirely visible rocks from a 3D surface data segmentation of laboratory rock piles

Once segmentation of 3D surface data of a rock pile has been performed, the next task is to determine the visibility of the surface rocks. A region boundary-following algorithm that accommodates irregularly spaced 3D coordinate data is presented for determining this visibility. We examine 3D surface segmentations of laboratory rock piles and determine which regions in the segmentation correspond to entirely visible rocks, and which correspond to overlapped or partially visible rocks. This is a significant distinction as it allows accurate size determination of entirely visible rocks, separate handling of partially visible rocks, and prevents erroneous bias resulting from mishandling partially visible rocks as smaller entirely visible rocks. Literature review indicates that other rock pile sizing techniques fail to make this distinction. The rock visibility results are quantified by comparison to manual surface classifications of the laboratory piles and the size results are quantified by comparison to the sieve size.     

宁夏遥感影像旅游地图的编制

为更加充分地展示宁夏地貌、地形特点,选用平面制图软件CorelDRAW12,从宁夏遥感影像地图的整体设计、特色符号设计、绘制地图等方面制作宁夏遥感影像旅游地图,使其成为独具宁夏文化旅游特色的旅游地图,并把宁夏旅游信息传递给各地游客．     

丝绸之路与汉代西域的毛纺织技术

以新疆洛浦县山普拉出土的汉代毛纺织物为研究样本,通过对服装、装饰带、缀织绦、毛毯等出土文物的分析,指出:丝绸之路的开通使得希腊艺术、中原艺术、草原游牧民族艺术与本土艺术得到了前所未有的交融和并行的发展,汉代西域毛纺织技术展示了汉代时期西域地区民族文化的一个侧面,它是丝绸之路上中外纺织技术交流发展的结果.     

基于肤色检测的AdaBoost人脸检测算法改进

AdaBoost人脸检测算法用于嵌入式实时高清视频时检测速度缓慢.为此,提出一种改进的人脸检测算法.对图像做肤色检测,将检测到的区域进行形态学处理,并作为感兴趣区域,完成AdaBoost人脸检测,以得到检测结果.实验结果表明,该算法在嵌入式系统上运行稳定,能提高检测速度和检测正确率.     

A general fan-beam reconstruction algorithm for free-form trajectories

In this paper we develop a general exact fan-beam reconstruction algorithm for free-form trajectories not only closed but also unclosed, based on the fan-beam reconstruction formula recently developed by Noo et al.. A mathematical proof is then provided with the geometrical explanation of equi-spatial detectors. With this algorithm we can obtain exact region of interest (ROI) reconstruction if and only if every projecting line passing through the ROI intersects the free-form source trajectory, when the projections are not truncated. Furthermore, under the condition that the source-to-detectors distance changes slowly enough relative to the length itself, we obtain a very good approximate reconstruction algorithm, which is the same as the algorithm of the circular trajectory except that the source-to-detectors distance is a function of the rotation angle. Then the algorithms are tested using the Shepp-Logan phantom and the experiment shows that the algorithms can get perfect numerical results.     

40MnV钢中微合金元素氮-碳化物的析出行为

用Thermo-cale软件对微合金钢40MnV(%：0．36-0.40C，1．36～1.40Mn，0.8～0.9V，0.011-0．016Ti，0．021-0．045Al，0．007-0．016N)中的析出相进行计算，并用电解分析，X-衍射，透射电镜研究了析出相的成分、形貌和分布。结果表明，钢中少量的N和Ti可导致在固液两相区析出尺寸为50nm的粗大TiN粒。随温度降低，析出相尺寸逐渐减小到10nm以下，形状由方形变成圆形，且析出相中V和C含量增加，N和Ti含量减少。随着钢中铝含量的增加，VN析出量减少。