基于灰度图像的车牌识别系统

本文提出了一种基于灰度图像的车牌识别系统。车牌识别系统主要包括车牌定位和字符识别。为了快速准确地进行车牌定位，本文提出了一种基于字符连接特征的定位算法。在识别系统中，我们采用了一种二次字符识别的算法。     

智能传感器侦察网络中的目标声信号识别算法

针对智能传感器侦察网络中的地面目标识别问题,提出了一种基于智能计算方法的地面目标声信号识别算法。基于智能计算方法设计识别系统,直接利用信号特征的变化范围作为分类特征,并结合能够处理定性输入的粗神经网络分类算法,有效地克服目标信号的不确定性问题,提高识别系统的识别率和稳定性。     

基于NMI特征的Auto-Camshift算法及其应用

基于NMI特征及Camshift算法，提出了扩展Auto-Camshift算法，该算法分割得到目标物体，分别对每个物体进行Camshift运算，同时结合了物体归一化转动惯量特征对物体进行学习和辨认。该算法同Camshaft相比，增加了归一化转动惯量NMI这一以目标不变特征为识别基础的特征，同时实现了多物体识别、自主学习。在“富莱德”机器人系统上的试验结果证明所提供的算法在学习和识别系统中有很好的鲁棒性和实时性。     

基于调制连续谱特征提取的被动声纳目标识别技术研究

目标噪声特征提取和目标分类器设计是被动声纳目标识别系统的关键技术.本文针对被动声纳目标识别,提出了一种新的调制连续谱特征提取方法.此外,为训练神经网络目标分类器,本文将遗传算法和BP算法相结合,提出了一种新的自适应遗传BP算法.最后,对海上实录的三类目标噪声进行了分类识别,实验结果表明本文设计的被动声纳目标识别系统具有很好的分类效果.     

工程图对象识别规则自动获取方法的研究

分析了工程图中工程对象的构图特点，设计了适用于识别的对象特征组结构．提出了通过抽取对象特征组、由特征组自动生成识别规则的方法．提出了在识别系统中加入对象特征抽取以及识别规则自动生成与调整功能使识别系统能方便地适应新图例从而提高适应能力的方法．该方法已应用于一个建筑工程图自动分析软件并取得了较好的效果．     

一种用于彩色图像目标识别的自适应阈值分割方法

机器人视觉系统利用颜色、形状等信息来识别环境目标，但是难点在于识别的鲁棒性和实时性的保证。采用移动机器人做平台，提出一种基于颜色学习的实时目标识别系统，并提出了一种目标颜色学习和分割算法，该算法基于自适应阈值分割图像，考虑环境的光照变化进行调整，改善了系统的实时性和鲁棒性。     

一种语音特征信息综合快速算法-N-BEST算法

语音识别技术一直是学术界研究的热点。语音特征信息综合是提高语音识别系统性能的一条有效途径。提出了一种语音特征信息综合快速算法——N-BEST算法。该方法可以较大地减少语音特征信息综合的运算量,提高特征信息综合语音识别系统的运行速度。     

一种语音特征信息综合快速算法—─N-BEST算法

语音识别技术一直是学术界研究的热点。语音特征信息综合是提高语音识别系统性能的一条有效途径。提出了一种语音特征信息综合快速算法———Ｎ ＢＥＳＴ算法。该方法可以较大地减少语音特征信息综合的运算量,提高特征信息综合语音识别系统的运行速度     

一种基于非线性特征提取的被动声纳目标识别方法研究

目标噪声特征提取是被动声纳目标识别系统的关键技术。首先提出了一种利用从噪声极限环中提取的非线性特征来分析舰船噪声信号的新方法,然后采用基于自适应遗传BP算法的神经网络对提取的特征进行分类。实验结果表明,该系统具有较好的分类效果。     

基于无人机倾斜测量的建筑特征提取与分类研究

针对无人机倾斜测量的建筑特征提取与分类精度低的问题,提出一种结合SSD(Single Shot MultiBox Detector)算法和最小显著性差异法(Least Significant Difference, LSD)算法的建筑特征提取与分类方法。首先将SSD算法模型原始卷积层建立为目标特征层,并采用空洞卷积底部采样方式结合深层特征与浅层特征,实现SSD算法改进;然后采用改进SSD算法对含目标建筑物的图像进行筛选;最后利用LSD算法对筛选出的图像进行分类识别,以此实现建筑特征提取与分类。仿真结果表明,所提方法可有效提高无人机倾斜测量的建筑特征提取与分类识别精度,相较于Radon和PPHT算法模型,所提方法对建筑物中心识别准确率和组识别准确率最高,分别达到94.75%和83.49%,可实现1:500的航空摄影测量大比例尺地形图绘制。     

Effects of Different Spatial Resolution of Remote SensingImages on Estimation Accuracy of Urban Building Height

In this study,the remote sensing images of WorldView-2,GF-2,and GF-1,which cover Xiamen Software Park,were selected for study.A building and shadow extraction process suitable for different images was constructed,which applied object\|oriented approach and morphology ideas combined with spectral,shadow and shape constraints.Subsequently,the building heights of three different spatial resolutions of 0.5 m,1 m and 2 m were estimated by using the shadow length estimation method.Finally,the influence of image spatial resolution on building extraction accuracy and building height estimation accuracy was evaluated quantitatively.The main conclusions are as follows：(1) The improved building and shadow extraction process achieves higher extraction accuracy,but accuracy decreases slightly with the decrease of spatial resolution of images;(2) With the decrease of spatial resolution,the accuracy of building height estimation decreases gradually,but it does not show linear relationship.At the resolution increases from 1m to 0.5 m,the accuracy of building height estimation increases faster than the resolution increases from 2 m to 1 m;(3) GF-1 is more suitable for height estimation of high\|rise buildings and GF-2 is suitable for middle and high rise buildings,while WorldView\|2 has higher estimation accuracy for building height in different height ranges.     

Dimensional reduction of 3D building models using graph theory and its application in building energy simulation

Since the various people involved in the design process for a building project tend to hold conflicting views, this inevitably leads to a range of disparate models for planning and calculation purposes. In order to interpret the relevant geometrical, topological and semantical data for any given building model, we identify a structural component graph, a graph of room faces, a room graph and a relational object graph as aids and explain algorithms to derive these relations. We start with a building model by transferring its geometrical, topological and semantical data into a volume model, decomposing the latter into a so-called connection model and then extracting all air volume bodies and hulls of the model by means of further decomposition into elementary cyclic connection components. The technique is demonstrated within the scope of building energy simulation by deriving both a dimensionally reduced object model required for setting up a thermal multizone model and a geometrical model for defining single or multiple computational fluid dynamic domains in a building together with incidence matrices correlating these models. The algorithm is basically applicable to any building energy simulation tool.

一种遥感图像中建筑物的自动提取方法

目前，传统建筑物识别方法通常采用基于建筑物边缘线性特征的识别算法，这类方法具有简单高效的优点，但识别率较低。该文提出了一种综合利用建筑物的若干特征进行自动识别的方法。首先用Canny算子提取边缘。然后根据建筑物的空间分布特点和Hough变换特性。在Hough变换域进行建筑物边缘方向统计来筛选边缘线段，提取出潜在的目标边缘线段；接着该文提出了对建筑物的几何特征（例如矩形特征、角点特征和阴影特征等）和灰度特征进行识别的算法，将其识别结果做为判定建筑物目标的依据，最终准确地提取出建筑物。大量实验证明该方法相比较单一的线性特征检测方法，速度快、准确率高．具有较强的实际应用价值。     

Building Height Estimation from GF-2 Image based on Morphological Shadow Index

GF-2 is a high resolution earth observing satellite with sub\|meter resolution which is developed by our own technique.To estimate urban building height based on GF\|2 remote sensing image combined with the idea of mathematical morphology and object\|oriented classification.First of all,segment image based on multi\|scale segmentation.Then extract shadow and calculate its length based on object\|oriented classification combined with spectral,shape,Morphological Shadow Index (MSI) and other features.In the end,estimate building height based on the geometrical model of satellite,sun and building and then accuracy evaluation and error analysis are carried out by using the field measurement data.Experimental results showed that 90% of the buildings’ absolute error is less than 1 m.This experiment demonstrate that the method can extract the height of urban building from the GF\|2 image effectively and the immense potential of domestic high resolution remote sensing image in applications on urban building information extraction.     

网络处理器IXP425及其应用

本文介绍了一种新型的网络处理器IXP425，分析了其模块结构组成和性能特点，并讨论了最新型的网络处理在智能住宅中的应用，该设计方案充分利用了IXP425优秀的宽带能力，大幅提高了智能住宅的网络性能和控制能力。     

搭建式软件开发技术研究与应用

为适应软件开发对业务敏捷性和即时构造性的新要求,采用面向服务的思想,对搭建式软件开发理论和技术进行了研究和实现。与已有的开发模式相比,搭建式开发技术的优势在于它能将工作流、W ebG IS集成到一个面向服务的可视化的搭建平台中。通过电子政务系统的搭建过程表明,搭建式开发技术具有按需、即时、实用的特点,增强了企业的竞争优势。     

从LiDAR数据中提取建筑物平面目标的新方法

提出一种从机载LiDAR点云数据中自动提取建筑物平面的方法。给出了基于边长约束的三角形生长算法对建筑物初始区域进行提取,针对提取出的建筑物脚点,利用自适应Mean Shift方法在特征空间中对其进行聚类分析,并提取出平面目标,最后利用Alpha-Shape算法生成建筑物平面的轮廓线。通过实验证实了方法的有效性。     

Toolbox for super-structured and super-structure free multi-disciplinary building spatial design optimisation

Multi-disciplinary optimisation of building spatial designs is characterised by large solution spaces. Here two approaches are introduced, one being super-structured and the other super-structure free. Both are different in nature and perform differently for large solution spaces and each requires its own representation of a building spatial design, which are also presented here. A method to combine the two approaches is proposed, because the two are prospected to supplement each other. Accordingly a toolbox is presented, which can evaluate the structural and thermal performances of a building spatial design to provide a user with the means to define optimisation procedures. A demonstration of the toolbox is given where the toolbox has been used for an elementary implementation of a simulation of co-evolutionary design processes. The optimisation approaches and the toolbox that are presented in this paper will be used in future efforts for research into- and development of optimisation methods for multi-disciplinary building spatial design optimisation.     

Semantic interoperability in building design: Methods and tools

Semantic interoperability is a crucial element to make building information models understandable and model data sharable across multiple design disciplines and heterogeneous computer systems. This paper presents a new approach and its software implementation for the development of building design objects with semantics of interoperable information to support semantic interoperability in building designs. The novelty of the approach includes its incorporation of building design domain ontology, object-based CAD information modeling, and interoperability standard to make building information models and model data semantically interoperable. A set of methods are proposed to address the issues of object-based building information representation compliant with the Industrial Foundation Classes (IFC); extension of IFC models with the supplementary information; and semantic annotation of the interoperable and extensible information sets. The prototype implementation of these methods provides a set of Web-enabled software tools for effectively generating, managing, and reusing the semantically interoperable building objects in design applications of architectural CAD, structural analysis, and building code conformance checking.