搜索结果: 1-9 共查到“工学 Field-Based”相关记录9条 . 查询时间(0.109 秒)
A METHOD TO ESTIMATE TEMPORAL INTERACTION IN A CONDITIONAL RANDOM FIELD BASED APPROACH FOR CROP RECOGNITION
Conditional Random Fields Crop Recognition Multitemporal Image Analysis
2016/11/23
This paper presents a method to estimate the temporal interaction in a Conditional Random Field (CRF) based approach for crop recognition from multitemporal remote sensing image sequences. This approa...
ANALYSIS OF THE EFFECTIVENESS OF SPECTRAL MIXTURE ANALYSIS AND MARKOV RANDOM FIELD BASED SUPER RESOLUTION MAPPING OVER AN URBAN ENVIRONMENT
Hyperspectral Images Spectral Mixture Analysis Markov Random Field Simulated annealing Super Resolution Mapping
2015/12/31
The information in a pixel of satellite data within the instantaneous Field of View (IFOV) of the sensor is a mixture of different land cover types, and the individual land cover components can be est...
FIELD-BASED CLASSIFICATION OF AGRICULTURAL CROPS USING MULTI-SCALE IMAGES
Field-Based Image Classification High Resolution Agricultural Crop Mapping SPOT4 SPOT5 IKONOS QuickBird Turkey
2015/8/19
This paper presents field-based classifications performed using the multi-resolution images of SPOT4 XS, SPOT5 XS, IKONOS XS,QuickBird XS, and QuickBird Pansharpaned (PS) covering an agricultural area...
FIELD-BASED CROP MAPPING THROUGH SEQUENTIAL MASKING CLASSIFICATION OF MULTI-TEMPORAL LANDSAT-7 ETM+ IMAGES IN KARACABEY, TURKEY
Landsat Agriculture Crop Classification Multitemporal Integration Object
2015/7/29
This study presents a field-based crop mapping through sequential masking classification of multi-temporal Landsat-7 ETM+ images
acquired in May, July, and August 2000 in Karacabey, Turkey. First, t...
基于Fluent的固定床生物质气化炉冷态压力场研究（Analysis of Fixed-bed Biomass Gasifier Cold Internal Pressure Field Based on Fluent）
生物质气化 下吸式气化炉 数值模拟
2010/12/29
以下吸式固定床生物质气化炉物理模型为研究对象，应用流体仿真软件Fluent，对冷态气化炉在单、双层气化剂配风工况下的床层压力场进行仿真研究。通过气化炉多点测压实验，对仿真结果进行验证。利用欧拉-拉格朗日方法分析气化炉冷态流场分布特性，根据伯努利方程说明气化炉床层压力场的变化原因。结果表明，仿真与实验结果的误差值在2.5%以内，气化剂配风工况的变化改变了炉内流场，双层气化剂配风使氧化层压力场平均值...
超声波传感器评定水田激光平地机水平控制系统性能（Evaluation of Leveling Performance for Laser-controlled Leveling Machine in Paddy Field Based on Ultrasonic Sensors）
水田激光平地机 超声波传感器 测距
2009/11/3
为了评定水田激光平地机平地铲水平控制系统性能，采用2个SensComp 600超声波传感器测量平地铲两端与参考水平面的距离，然后利用三角关系计算得到平地铲倾斜角度。对超声波测距、传感器与反射面成一定夹角的影响以及运动对测量的影响因素进行了分析，并与姿态航向参考系统AHRS500GA-226提供的参考倾角进行了对比，结果表明2个超声波传感器在静态和动态条件下均能较准确地测量出平地铲倾斜角度，最大静止...
基于人工神经网络的田间秸秆覆盖率检测系统（Measuring System for Residue Cover Rate in Field Based on BP Neural Network）
保护性耕作 秸秆覆盖率 BP神经网络
2009/8/11
以VC++为工具，田间实拍图像为研究对象，在分析田间秸秆和土壤纹理特征差别的基础上，设计了BP神经网络秸秆覆盖率检测系统。该系统采用了神经网络与纹理特征相结合的方法提取秸秆，并以纹理特征熵值为标准建立了网络输入层学习样本选取准则。人工模拟和田间试验表明，设计的BP神经网络秸秆覆盖率检测系统对田间秸秆的识别率达90%以上，秸秆覆盖率计算误差可控制在5%以内；与传统的拉绳法相比，检测效率提高50～12...
基于颜色特征的棉田中铁苋菜识别技术（Copperleaf Herb Detection from Cotton Field Based on Color Feature）
棉花 杂草识别 机器视觉
2009/8/11
基于不同的颜色特征，利用机器视觉技术自动识别棉田中铁苋菜。分别对棉花和杂草铁苋菜的色差法(R—G，R—B，G—B)、超绿法(2G—R—B)、色度法(H)等5种特征图像进行对比，确定色度法利用最大方差进行二值化的效果最佳。创建与二值图像相对应的0、1双精度型矩阵，并分别与R、G、B三基色分量图相乘，获取前景是R、G、B三基色分量图，背景是黑色的灰度图像。分析棉花、铁苋菜前景R、G、B的标准差，确定R...
Constraint Loss Correction for Assessment of Brittle Fracture Initiation in Residual Stress Field Based on the Weibull Stress Criterion
Constraint Loss Correction Brittle Fracture Initiation Residual Stress Field Weibull Stress Criterion
2009/4/24
This paper studies the method for estimating the welding residual stress effect on brittle fracture of structural steel based on the Weibull stress criterion. Using wide plate (WP) specimens with and ...