Fitting boxes to Manhattan scenes using linear integer programming

We propose an approach for automatic generation of building models by assembling a set of boxes using a Manhattan-world assumption. The method first aligns the point cloud with a per-building local coordinate system, and then fits axis-aligned planes to the point cloud through an iterative regularization process. The refined planes partition the space of the data into a series of compact cubic cells (candidate boxes) spanning the entire 3D space of the input data. We then choose to approximate the target building by the assembly of a subset of these candidate boxes using a binary linear programming formulation. The objective function is designed to maximize the point cloud coverage and the compactness of the final model. Finally, all selected boxes are merged into a lightweight polygonal mesh model, which is suitable for interactive visualization of large scale urban scenes. Experimental results and a comparison with state-of-the-art methods demonstrate the effectiveness of the proposed framework.     

基于Manhattan距离的相干体技术的应用

地震相干体技术可以有效地压制连续性,突出不连续性,比地震切片的地质解释更直观,能更细致地进行断层解释。基于Manhattan 距离的相干体技术,与传统的C1 相干算法进行比较,该技术不仅在断层识别能力方面要强于C1 相干算法,而且当利用两种算法获取断层信息的效果相当时,该技术的相关时窗长度要比C1 相干算法所用的相关时窗长度小,这恰能提高程序的运行速度,提高了地震相干体技术的运行效率。此外,该相干体技术也能近似计算出每道在纵横测线方向上的视时间倾角。     

基于权重曼哈顿非负矩阵分解的图像修复和聚类方法

当数据中存在大量椒盐噪声时,传统的鲁棒非负矩阵分解方法无法获得更具有鲁棒性的低维特征.为了解决该问题,本文提出了一种更具有鲁棒性的权重曼哈顿非负矩阵分解来修复被污染的数据点以及通过曼哈顿矩阵分解获得鲁棒的特征表示.本文提出的模型可以被看作为非凸非光滑的优化问题,可以通过加速梯优化理论和最小一乘法求其局部最优解.通过对人脸图像ORL数据集加入椒盐噪声,实验结果表明本文提出的算法在图像修复和学习特征表示方面更有效、更鲁棒.     

Raw materials activities of the manhattan project on the colorado plateau

The Manhattan Project was a highly secret project during World War II to develop the atomic bomb, and included the acquisition of raw materials. It was carried out by the Army’s Corps of Engineers Manhattan Engineer District. In the United States, 2,698,000 pounds of uranium oxide were acquired at various vanadium mills on the Colorado Plateau, mainly from the treatment of tailings. Geologic investigations conducted by a contractor, Union Mines Development Corporation, laid the ground work for the exploration activities of the Atomic Energy Commission which succeeded the Manhattan Engineer District in 1947