Improved estimation of defocus blur and spatial shifts in spatial domain: a homotopy-based approach

This paper presents a homotopy-based algorithm for the recovery of depth cues in the spatial domain. The algorithm specifically deals with defocus blur and spatial shifts, that is 2D motion, stereo disparities and/or zooming disparities. These cues are estimated from two images of the same scene acquired by a camera evolving in time and/or space. We show that they can be simultaneously computed by resolving a system of equations using a homotopy method. The proposed algorithm is tested using synthetic and real images. The results confirm that the use of a homotopy method leads to a dense and accurate estimation of depth cues. This approach has been integrated into an application for relief estimation from remotely sensed images.     

Rolling and swaying motion estimation for a mobile robot by using omnidirectional optical flows

Described here is a method for estimating rolling and swaying motions of a mobile robot using optical flow. We have proposed an image sensor with a hyperboloidal mirror for the vision-based navigation of a mobile robot. Its name is HyperOmni Vision. The radial component of optical flow in HyperOmni Vision has a periodic characteristic. The circumferential component of optical flow has a symmetric characteristic. The proposed method makes use of these characteristic to estimate robustly the rolling and swaying motion of the mobile robot. Correspondence to: Y. Yagi e-mail: y-yagi@sys.es.osaka-u.ac.jp     

总体评价法在非线性控制系统极限环振荡研究中的应用

本文简要介绍了总体评价法在研究非线性控制系统极限环振荡方面的理论和应用。文中提供了大量例子说明总体评价法的正确和可信。总体评价法只需用少量的图和表就能方便地掌握系统中各种不同大小的非线性因素处于系统各种不同位置时，对系统动态性能的定性和定量影响，从总体上揭示非线性系统的各种特点。这无疑可以改进系统设计和改善运行性能。     

Application of multi-layer perceptron neural networks to vision problems

This paper discusses the application of a class of feed-forward Artificial Neural Networks (ANNs) known as Multi-Layer Perceptrons(MLPs) to two vision problems: recognition and pose estimation of 3D objects from a single 2D perspective view; and handwritten digit recognition. In both cases, a multi-MLP classification scheme is developed that combines the decisions of several classifiers. These classifiers operate on the same feature set for the 3D recognition problem whereas different feature types are used for the handwritten digit recognition. The backpropagationlearning rule is used to train the MLPs. Application of the MLP architecture to other vision problems is also briefly discussed.     

一种新的半像素快速搜索算法

提出了一种基于在整像素搜索结果的± 1像素邻域内 SAD函数随着与亚像素全局最小点距离的增加而单调增大的半像素两步快速搜索算法。本算法相继在水平和垂直两个共轭的方向上搜索半像素 SAD值的最小点 ,从而得到运动矢量的半像素分量。同时还采用了在每次计算 SAD值之前按需对块进行插值的方法。仿真结果表明本算法在保持图像质量和码流长度基本不变的同时使运算量下降到原来的一半以下。     

快速次优固定区间Wiener平滑器算法

为了克服带相关噪声控制系统的最优固定区间Kalman平滑算法要求较大计算负担的缺点,应用Kalman滤波方法,基于CARMA新息模型,由稳态最优Kalman平滑器导出了带相关噪声控制系统的最优固定区间Wiener递推状态平滑器,它带有系数阵指数衰减到零的高阶多项式矩阵.用截断系数矩阵近似为零的项的方法提出了相应的快速次优固定区间Wiener平滑算法.它显著地减少了计算负担,便于实时应用,还给出了截断误差公式和选择截断指标的公式.仿真例子说明了快速平滑算法的有效性.     

网络服务器软件老化现象的测试与分析

提出了一种测试软件老化过程的实验方案，编制了实现该方案的软件工具集，并以应用广泛的Apache网络服务器为目标，研究了当负载为泊松流时服务器的老化现象，用回归分析和ARIMA(自回归差分滑动平均)模型分析了剩余内存的变化情况。结果表明ARIMA模型可以较好地描述和预测内存的使用情况。     

噪声对贝叶斯频谱估计精度的影响

研究了贝叶斯频谱估计的基本理论和基本方法 ,分别对无噪声和有噪声的简谐正弦信号进行了频谱估计。计算结果显示 :无噪声信号频率估计偏倚为零 ;当信号噪声系数S/N =1时 ,贝叶斯频率估计的偏倚与Jaynes的理论值一致     

机械零件制造成本估算系统

机械零件制造成本是评价零件可制造性的 1个指标 ,对产品设计是 1种反馈 .通过产品制造成本的核算可以使设计人员在产品设计的早期阶段了解产品的制造成本 ,及时改进设计以降低成本 .准确、快速估算制造成本 ,不仅便于企业的生产活动的控制和管理 ,而且直接影响企业对市场的分析和产品数据的一致性 .与以往传统的核算方法不同 ,采用的基于特征的神经网络制造成本估算方法 ,避开了设计参数到成本参数之间复杂的非线形映射关系 ,实现了零件制造成本早期估算 .以回转类零件为例 ,对基于特征的神经网络成本估算方法进行了实例应用验证和分析 .     

An integrated system for process planning and cost estimation in hole making

The process planning function plays a critical role not only in computer integrated manufacture, but also in the economics of batch manufacturing. This paper describes the development of a generic knowledge-based system for process planning and cost estimation in the hole making process. The main function of the system, besides estimating the cost of production, is to recommend appropriate processes, their sequence and their respective machining conditions in order to obtain the required product specifications. The system has been implemented in a manufacturing organisation. The results obtained have indicated that in addition to cost savings the system also preserves the consistency in planning and cost estimation.