基于图像处理的小麦种植密度估算研究
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摘要
利用图像处理技术分析小麦图像的颜色特征,并提出叶片盖度(LCD)参数;通过小麦种植密度与不同参数之间的相关性分析,建立基于不同参数的预测模型。结果表明:以绿光标准化值(NDIG)和LCD结合的多元逐步回归模型优于其他单变量模型以及混合模型,可以作为小麦种植密度的定量估算模型。使用实测数据对模型进行验证,R~2为0.896 1,达到极显著水平。结果说明该方法可行,可为小麦生长前期种植密度的快速、精确检测提供依据。
The image color feature of wheat was analyzed by using image processing and the leaf cover degree(LCD)parameter was proposed.The prediction model was established based on different parameters through the correlation analysis between the wheat planting density and different parameters.The results showed that the multiple stepwise regression model with green standardized values(NDIG)and LCD was superior to other single model and hybrid model,which could be used as the quantitative estimation model of wheat planting density.Using the measured data to verify the model,R~2 was 0.896 1,reached extremely significant level.The method is feasible,and provides the basis for fast and accurate estimation of the early stage of the wheat planting density.
The image color feature of wheat was analyzed by using image processing and the leaf cover degree(LCD)parameter was proposed.The prediction model was established based on different parameters through the correlation analysis between the wheat planting density and different parameters.The results showed that the multiple stepwise regression model with green standardized values(NDIG)and LCD was superior to other single model and hybrid model,which could be used as the quantitative estimation model of wheat planting density.Using the measured data to verify the model,R~2 was 0.896 1,reached extremely significant level.The method is feasible,and provides the basis for fast and accurate estimation of the early stage of the wheat planting density.
引文
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[23]蔡鸿昌,崔海信,宋卫堂,等.黄瓜初花期叶片光合色素含量与颜色特征的初步研究[J].农业工程学报,2006,22(9):34-38.
[24]LI Y,CHEN D,WALKER C N,et al.Estimating the nitrogen status of crops using a digital camera[J].Field Crops Research,2010,118(3):221-227.
[25]凌启鸿,苏祖芳,张洪程,等.水稻品种不同生育类型的叶龄模式[J].中国农业科学,1983(1):9-18.
[2]吴九林,彭长青,林昌明.播期和密度对弱筋小麦产量与品质影响的研究[J].江苏农业科学,2005(3):36-38.
[3]雷钧杰,宋敏.播种期与播种密度对小麦产量和品质影响的研究进展[J].新疆农业科学,2007,44(S3):138-141.
[4]王伯荪.植物群落学[M].北京:高等教育出版社,1987:18-19.
[5]李建龙.草地退化遥感监测[M].北京:科学出版社,2012:34-35.
[6]李营,张峰,王桥.呼伦贝尔盟草原植被覆盖状况时空演变特征分析[J].干旱区资源与环境,2010,24(6):126-131.
[7]俞斌华,侯扶江,林慧龙.牧草种群生长对家畜践踏的短期响应[J].草业学报,2005,14(4):119-124.
[8]SMITH M O,USTIN S L,ADAMS J B,et al.Vegetation in deserts(Ⅰ):a regional measure of abundance from multispectral images[J].Remote Sensing of Environment,1990,31(1):1-26.
[9]章文波,符素华,刘宝元.目估法测量植被覆盖度的精度分析[J].北京师范大学学报(自然科学版),2001,37(3):402-408.
[10]章超斌,李建龙,张颖,等.基于RGB模式的一种草地盖度定量快速测定方法研究[J].草业学报,2013,22(4):220-226.
[11]LUSCIER J D,THOMPSON W L,WILSON J M,et al.Using digital photographs and object-based image analysis to estimate percent ground cover in vegetation plots[J].Frontiers in Ecology and the Environment,2006,4(8):408-413.
[12]THALEN D C P.Ecology and utilization of desert shrub rangelands in Iraq[M].Netherlands:Springer,1979.
[13]SAKAMOTO T,GITELSON A A,NGUY-ROBERTSON A L,et al.An alternative method using digital cameras for continuous monitoring of crop status[J].Agricultural and Forest Meteorology,2012,154/155:113-126.
[14]谭昌伟,庄恒扬,周清波.水稻叶片营养的光谱诊断研究[J].扬州大学学报(农业与生命科学版),2009,30(2):50-53.
[15]SUN G,WANG X,HE G.Segmentation algorithm of overlapping tomato seedling leaves based on edge chaincode information[J].Transactions of the Chinese Society of Agricultural Engineering,2010,26(12):206-211.
[16]CAMARGO A,SMITH J S.An image-processing based algorithm to automatically identify plant disease visual symptoms[J].Biosystems Engineering,2009,102(1):9-21.
[17]GUERRERO J M,PAJARES G,MONTALVO M,et al.Support vector machines for crop/weeds identification in maize fields[J].Expert Systems with Applications,2012,39(12):11149-11155.
[18]KIRK K,ANDERSEN H J R,THOMSEN A G,et al.Estimation of leaf area index in cereal crops using redgreen images[J].Biosystems Engineering.2009,104(3):308-317.
[19]SUN C,LIU T,JI C,et al.Evaluation and analysis the chalkiness of connected rice kernels based on image processing technology and support vector machine[J].Journal of Cereal Science,2014,60(2):426-432.
[20]刘海娟,邵陆寿,朱建辉,等.基于图像处理的水稻成熟期密度检测[J].昆明理工大学学报(理工版),2009,34(2):84-88.
[21]OTSU N.A threshold selection method from gray-level histograms[J].IEEE Transactions on Systems,Man and Cybernetics,1979,9(1):62-66.
[22]张德才,周春光,周强,等.基于轮廓的孔洞填充算法[J].吉林大学学报(理学版),2011,49(1):82-86.
[23]蔡鸿昌,崔海信,宋卫堂,等.黄瓜初花期叶片光合色素含量与颜色特征的初步研究[J].农业工程学报,2006,22(9):34-38.
[24]LI Y,CHEN D,WALKER C N,et al.Estimating the nitrogen status of crops using a digital camera[J].Field Crops Research,2010,118(3):221-227.
[25]凌启鸿,苏祖芳,张洪程,等.水稻品种不同生育类型的叶龄模式[J].中国农业科学,1983(1):9-18.