數(shù)字圖像技術在冬小麥群體監(jiān)測中的應用研究.pdf

1、中國農業(yè)大學博士學位論文數(shù)字圖像技術在冬小麥群體監(jiān)測中的應用研究姓名：單成鋼申請學位級別：博士專業(yè)：作物栽培學與耕作學指導教師：王璞廖樹華20060601中國農業(yè)大學博士學位論文ABSTRACTABSTRACTThetheoryandtechniqueofdigitalimageprocessing(DIP)areappliedondevelopingthemethodsformonitoringwinterwheatcanopyund

2、erfieldconditionsThetechniquesofimageacquisition，imagesegmentationandcolorcalibrationaredevelopedFurthermore，theimagefeatureindicesofcanopyscale，canopynutritionalstatusandcanopycomponentsdistributionaredeterminedThemajor

3、resultsareasfollows：1Threestandardmethodsofimageacquisitionareestablished，whichareusedinmonitoringthescaleandtextureofcanopythenutritionalstatusofcanopycomponentsdistributionanduniformityofcanopy2Anewmethodofimagesegment

4、ationbasedonExGhistogramisimproved，andthecorrectclassificationrateincreasesfrom74％to88％Thehighlightareainwheatcanopyisabout08％TheprocessingmethodsarepresentedinordertoreduceitsinfluenceAftercolorbalanceaccordingtocolorof

5、greycard，varianceofhuevaluecouldbereducedfrom5655to4743Onthebasisoftheoryandexperimentaldata，thelogarithmicmodelbetweencanopycoverageandleafareaindexisestablished：LAl2—22441n(1一rc)，whichhastheexactbiologicalsignificancea

6、ndthedegreeoffittingisimprovedCanopy—coverage—duration(CcD)isusedfordescribingthecanopycoverageaccumulationduringaperiod；itstherioticalexpressionandcomputingfunctionaredevelopedEulernumberisintroducedonthestudyofwheatcan

7、opySignificantlynegativecorrelationbetweenEulernumberandLAIisobeservedbeforeheadingofwinterwheat；themodelsofregressionaredifferentbetweencultivars(Jin9411andJingDon98)atthesamegrowthstage，whilenosignificantdifferencefort

8、hesamecultivaramongtreatmentsTheimagemethodsbasedonimageedgepixelnumberaredevelopedtoestimatethetotalstemnumberofwheat，andthe3layersBPneuralnetworkisappliedinthemodel4Thetexturefeatureindexesaredeterminedbystepwisediscri

9、minantmethodThecorrectclassificationrateatbootingstageisthehighest(1OO％)comparingwiththatatothergrowthstagesTherefore，thedifferentcanopystructureofwinterwheatcouldbeclassifiedbyanalysisingimagetextureAnewimageindex(PUI)i