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基于最小二乘法的早期作物行中心线检测方法(Early Stage Crop Rows Detection Based on Least Square Method)
农业机械 导航 机器视觉 图像分割
2010/12/29
提出了一种基于最小二乘法的早期作物行中心线检测算法。利用G-R颜色特征因子分割作物与背景。根据作物与杂草的长度属性去除部分杂草噪声,应用垂直投影法动态检测作物行数,并提取作物行中点为特征点,获得特征点图像。利用特征点间的邻近关系对特征点进行分类,对归类后的特征点进行两次最小二乘法拟合,得到作物行中心线。对于有作物缺失的作物行,采用统计条形区域内特征点数量的方法判别检测结果的可信度。实验结果表明,算...
油菜分段收获脱粒清选试验(Experiment on Threshing and Cleaning in Two-stage Harvesting for Rapeseed)
油菜 分段收获 脱粒 清选
2010/12/28
对我国南方油菜分段收获割晒后的脱粒清选特性和脱粒清选参数进行了研究。通过在试验台上脱粒和清选正交试验,得出了分段收获捡拾脱粒机脱粒、清选部件形式和两组合理的工作参数。试验结果表明:脱粒分离夹带损失最小的优选参数组合为喂入量1.6kg/s、滚筒转速750r/min、脱粒间隙15mm、滚筒形式钉齿6排;影响脱粒分离夹带损失率的主次因素为滚筒形式、喂入量、脱粒间隙和滚筒转速。综合考虑清选损失率和含...
小麦拔节期农学参数和土壤含水量空间统计(Spatial Statistic Properties of Agronomic Parameters and Soil Moisture Content in Wheat Jointing Stage)
冬小麦 农学参数 土壤
2009/11/3
选取山东省陵县的小麦试验示范基地作为样区,采用GPS定位调查,获取田间21个样点的土壤和小麦植株样品,运用TDR300测定样点土壤含水量,利用SPAD-502叶绿素仪测定采样点拔节期小麦植株叶片的叶绿素含量,获取小麦干物质产量信息。基于地统计学原理,结合空间分析技术,探讨了小麦叶绿素含量、干物质产量等农学参数信息和土壤含水量的空间变异特征。研究结果表明,土壤水分和小麦叶绿素含量的空间变异呈强的空间...
Regulation of Irrigation Canals Using a Two-Stage Linear Quadratic Reliable Control
Irrigation canals Two-stage reliable control Linear quadratic control
2009/10/12
A 2-stage discrete-time linear quadratic reliable control technique is applied to the regulation of irrigation canals. The Saint-Venant equations of open-channel flow are linearized using the Taylor s...
The contemporary stage of the Czech countryside: European integration expectations
Czech countryside rural areas agriculture rural development changes in the countryside
2014/3/28
The contemporary Czech countryside underwent an important change during the last ten years. The political, economic and social system of agriculture and rural areas went through a basic transition. We...