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1.
视觉平衡是影响地图信息传输效果的重要因素之一。由于泛在制图的非专业性,泛在地图图像的视觉平衡效果往往取决于制图者自身美学素养的高低,不具有可控性。因此,迫切需要发展泛在地图图像的视觉平衡度计算方法。现有的地图视觉平衡度计算方法存在因子不全、判别结果主观依赖性强等问题。针对这些问题,本文提出了一种结合地图图像计算特征与专家评价知识的泛在地图图像视觉平衡度计算框架。通过丰富地图视觉密度影响因子,并引入概率模型学习专家对泛在地图图像的评价知识,实现对泛在地图图像视觉平衡度复杂分布的有效判别。本文以专家问卷的方式搜集了30名地图制图专家对1 730幅泛在地图图像的视觉平衡评价数据,构建了一个泛在地图图像视觉平衡度评价数据集。将计算得到的地图视觉平衡指标作为贝叶斯决策器的地图特征属性输入,将地图视觉平衡的专家评价数据作为贝叶斯决策器的分类结果,利用最小错误率贝叶斯决策方法对泛在地图图像的视觉平衡度进行判别,有效解决了人为主观判别地图视觉平衡度存在的不确定性问题。经实验验证,该框架在本文构建的泛在地图图像视觉平衡度评价数据集上能取得82.85%的评价准确率。 相似文献
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应用嵌入式Advanced RISC Machines微处理器LPC2378和实时操作系统uC/OS-II,设计了一种未来智能公路行车的模拟系统,系统由主车、从车以及相应的行车车道构成。经过反复测试,该系统符合实际设计要求和功能,主、从车能准确直观地获取在不同行驶环境和状态下的相关数据信息,从而进行相应的控制处理,实现车辆在适当条件下的自动行驶。 相似文献
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应用神经网络建立水下拖曳体轨迹姿态水动力控制模型 总被引:2,自引:0,他引:2
以拖曳体的拖曳水池样机试验取得试验数据作为训练样本,采用LMBP算法,建立基于神经网络理论构建的可控制水下拖曳体轨迹与姿态水动力控制数值模型,并进行LMBP模型仿真检验。结果表明,利用所建全的神经网络模型对拖曳体在一定控制动作下的水动力响应预报是令人满意的。 相似文献
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以拖曳体的拖曳水池样机试验取得试验数据作为训练样本,采用LMBP算法,建立基于神经网络理论构建的可控制水下拖曳体轨迹与姿态水动力控制数值模型,并进行LMBP模型仿真检验。结果表明,利用所建全的神经网络模型对拖曳体在一定控制动作下的水动力响应预报是令人满意的。 相似文献
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针对现有侧扫声呐辐射畸变改正方法难以实现复杂底质及作业环境下图像精细获取的问题,基于侧扫声呐图像辐射畸变诱因,提出侧扫声呐图像辐射畸变综合改正方法。该方法在胶州湾水域得到应用,消除了海况差、底质变化明显及人为增益参数调整等问题的影响,实现了复杂海洋环境及噪声影响下图像的高质量获取。与传统统计方法比较表明,综合法处理后图像熵值减小、峰值信噪比增加,图像质量得到有效提高。 相似文献
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战场态势推演GIS动态表达技术与应用 总被引:2,自引:0,他引:2
本文对战场态势推演过程的动态表达方法和演播方法进行了研究。提出了采用图形符号与动作相结合的方式进行战场态势推演过程动态表达的技术方法。同时,通过脚本控制使推演过程的演播更加生动、逼真,脚本控制主要包括播放场景命令、播放速度命令、跳转命令、暂停预约命令、播放语音命令。对实际开发提出的推演方法可行性和实用性作了验证,解决了战场态势推演的关键技术。 相似文献
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针对精确航天器姿态问题,采用修正罗德里格参数(MRPs)表示姿态,用动力学方程进行角速率的传播,分别基于等价协方差和观测残差统计特性的协方差调整方法,实现UKF算法的抗差效果,并通过仿真验证该方法的有效性。仿真结果表明:在含有粗差的情况下,两种抗差UKF算法均能得到稳定的状态估计值,而第二种方法计算效率更高。 相似文献
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CHAMP姿态数据间断的处理方法与精度分析 总被引:5,自引:4,他引:1
为探究CHAMP加速度计数据的预处理方法,分析了姿态数据间断的各种情况,提出了采用二次插值方法处理姿态数据间断,并用实测的CHAMP加速度计数据进行了验证。统计结果表明采用二次插值方法处理姿态数据间断,精度比线性插值法明显提高,当姿态数据连续间断小于40个历元的情况下,内插姿态数据对加速度的影响小于10-9ms-2,不影响其使用。 相似文献
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主要介绍ABB机器人自动磨抛系统控制原理,及其在水暖卫浴产品中的应用分析,同时介绍其硬件配置和软件设计。采用ABB第五代机器人控制器IRC5,给出基于DeviceNet总线的硬件设计过程。实现ABB机器人及自身快速、柔性配合,极大的提高生产效率。 相似文献
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Robot learning in unstructured environments has been proved to be an extremely challenging problem, mainly because of many
uncertainties always present in the real world. Human beings, on the other hand, seem to cope very well with uncertain and
unpredictable environments, often relying on perception-based information. Furthermore, humans beings can also utilize perceptions to guide their learning on those parts of the perception-action
space that are actually relevant to the task. Therefore, we conduct a research aimed at improving robot learning through the
incorporation of both perception-based and measurement-based information. For this reason, a fuzzy reinforcement learning
(FRL) agent is proposed in this paper. Based on a neural-fuzzy architecture, different kinds of information can be incorporated
into the FRL agent to initialise its action network, critic network and evaluation feedback module so as to accelerate its
learning. By making use of the global optimisation capability of GAs (genetic algorithms), a GA-based FRL (GAFRL) agent is
presented to solve the local minima problem in traditional actor-critic reinforcement learning. On the other hand, with the
prediction capability of the critic network, GAs can perform a more effective global search. Different GAFRL agents are constructed
and verified by using the simulation model of a physical biped robot. The simulation analysis shows that the biped learning
rate for dynamic balance can be improved by incorporating perception-based information on biped balancing and walking evaluation.
The biped robot can find its application in ocean exploration, detection or sea rescue activity, as well as military maritime
activity. 相似文献
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Experimental Application of Intelligent Robot Technology in Antarctic Scientific Expedition 总被引:1,自引:0,他引:1
Intelligent robot technology has great potential for application in polar scientific expedition. During the 24th Chinese Antarctic Expedition in the summer of 2007/08, our ice-snow surface mobile and the low-flying robots were successfully employed for the first time in the Antarctic. This paper firstly gives a brief introduction to the intelligent robot technology developed abroad and used in the Antarctic, then focuses on the ice-snow surface mobile and the low-flying robots developed by China as well as their field trials in the Antarctic. Moreover, the authors have considered the potential demand for the intelligent robot technology in China's Antarctic scientific expedition, in the hope of providing some reference for the future development of robot technologies. 相似文献
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高分辨率遥感影像阴影与立体像对提取建筑物高度比较研究 总被引:1,自引:0,他引:1
建筑物高度信息的快速准确获取对于城市规划管理、生态环境评价具有重要意义。本文以南京市主城区为研究区,选择2011年Geoeye-1卫星高分辨率遥感影像立体像对数据,结合Google Earth数据及实地建筑物高度测量,分别利用单幅遥感影像和立体像对计算建筑物高度,并以实测建筑物高度数据验证不同方法的提取精度,进而比较这2类方法的优缺点。结果表明:利用立体像对提取建筑物高度的方法更加精确,提取结果误差在2.8 m以内,能够快速地获取大范围建筑物高度,具有实用价值;单幅遥感影像阴影提取建筑物高度适用于建筑物高大、毗邻建筑物间隙大、周围无遮挡的情况,而立体像对提取建筑物高度不受建筑四周环境影响,在建筑物密集分布、高度均一的情况下,其普适性更强。 相似文献
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以TMS320DM642为核心构建一个实验室安全控制系统,通过摄像机采集视频图像,将图像传输给DM642进行图像处理,包括获取背景图像、差影处理、图像分割、运动目标检测、安全控制,并将处理结果显示在液晶屏上.实验验证,系统能够实现实验室条件下的安全控制. 相似文献
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《山地科学学报》2015,(2)
In order to predict long-term flooding under extreme weather conditions in central Asia, an energy balance-based distributed snowmelt runoff model was developed and coupled with the Soil and Water Assessment Tool(SWAT) model. The model was tested at the Juntanghu watershed on the northern slope of the Tian Shan Mountains, Xinjiang,China. We compared the performances of temperature-index method and energy balanced method in SWAT model by taking Juntanghu river basin as an application example(as the simulation experiment was conducted in Juntanghu River, we call the energy balanced method as SWAT-JTH). The results suggest that the SWAT snowmelt model had overall Nash-Sutcliffe efficiency(NSE) coefficients ranging from 0.61 to 0.85 while the physical based approach had NSE coefficients ranging from 0.58 to0.69. Overall, on monthly scale, the SWAT model provides better results than that from the SWAT-JTH model. However, results generated from both methods seem to be fairly close at a daily scale. Thestructure of the temperature-index method is simple and produces reasonable simulation results if the parameters are well within empirical ranges. Although the data requirement for the energy balance method in current observation is difficult to meet and the existence of uncertainty is associated with the experimental approaches of physical processes, the SWAT-JTH model still produced a reasonably high NSE. We conclude that using temperature-index methods to simulate the snowmelt process is sufficient, but the energy balance-based model is still a good choice to simulate extreme weather conditions especially when the required data input for the model is acquired. 相似文献
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随着北京社会经济的快速发展、人口的快速增长以及人民生活水平的不断提高,人民群众对于优质教育教学资源的需求越来越强烈,而教育的公平性和均衡发展也受到了人民群众和政府越来越多的关注。基础教育的均衡发展更多的需要依靠教育主管部门的政策支持,而政策的制定又需要根据教育均衡发展的实际情况有针对性的制定,那么首先就要对首都基础教育的均衡情况进行分析。本文基于GIS技术和统计学方法,采用差异系数法,选取相关指标,建立首都基础教育均衡性评价模型,利用ArcEngine组件和.Net技术集成开发并实现模型,对首都基础教育均衡性、资源配置均衡性、教育质量均衡性做出评价,为教育决策部门提供决策支持。 相似文献
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提出2个棱镜加上倾斜仪的盾构自动引导系统模型,利用双轴倾斜仪读取俯仰角和扭转角。根据盾首盾尾以及2个棱镜的空间位置关系,用空间解析几何方法推导了盾构姿态解算方法。 相似文献
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During the 2005 Arctic Yellow River Station expedition, the research on monitoring the movement and mass balance of two glaciers around Ny-Alesund, Austrelovenbreen and Pedersenbreen, which were selected in the 2004 Yellow River Station expedition were conducted. This paper analyzes the feasibility and advantage in using GPS method to monitor the Arctic glaciers'movement, estimates the precision of first time measured GPS data and discusses the relevant problems in surveying on the Arctic Glaciers with GPS. 相似文献
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土地覆盖的图像融合动态监测 总被引:1,自引:0,他引:1
近20年来,关于图像融合应用分析方法,如HIS,PCS,HPF,SFIM,SVR,Wavelet和Brovey等均有新的进展。本文主要是对不同时相的影像进行融合,如Brovey-融合法将不同时相的TM(1986年7月26日)和ETM+(2000年5月4日)的PAN波段影像进行融合,然后对其采用非监督分类和PCS分析,将两时相的土地覆盖变化区域提取出来。同时将两时相影像,用后分类法进行分类提取出变化区域。研究表明融合法具有快速、简便和准确的特点。 相似文献