地图图符提取与识别算法研究

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1、国防科学技术大学博士学位论文地图图符提取与识别算法研究姓名：曾迎生申请学位级别：博士专业：控制科学与工程指导教师：贺汉根20030401国防科学技术人学研究生院学位论文综上所述，本文的T作在地形图图符自动提取与识别算法研究方面进行了有益的探索，攻克了其中的一些理论和技术难题。为地形图计算机自动输入识别技术的工程应用打下了良好的基础。关键词等高线点状图符地图注记模式识别地形图汉字分割扫描数字化国防科学技术大学研究生院学位论文ABSTRACTTheautomaticinputandrecognitionoftopographic

2、mapsiswidelyrecognizedasoneofthemostdifficultproblemsintheworld.Itisthekeytechniquetomanageandpublishmapinformationautomatically.Themanagingtechnologyofdatabaseingeographicinformationsystemhasbecomerelativelymature,anditbecomesthebotleneckofthedevelopmentforthesyst

3、emtoobtaindata.Therearemanykindsofsymbolsinthetopographicmap.Thecontour,pointsymbolandChineseleteringannotationhavebeenchosenasthemainobjectofresearchinthisthesis,andthevalidmethodwillbeextendedtoothersymbols,thusallthesymbolscanbeextractedbythesimilarway.Therearea

4、lsodiferenttopographicmapscales.Astheinformationdensityinthetopographicmapof1:50000isthebiggest,andothertopographicmapofseveralkindsofscalescanbeobtainedfromit,sothescaleof1:50000ischosenasthescaleofourresearchmap.Attheverybeginningofthisdissertation,thedevelopment

5、ofextractingandrecognizingsymbolsofthemapissummarized.Inthefollowingcontent,thealgorithmsrelatedtothethesisaresimplyintroduced.Ontheaspectofcolorlayer,a4-Dmodel,whichcombinesthepixel'splanardistributionwiththecolorspaceorganically,hasbeenstructuredonthebaseofthehum

6、aneye'smechanism,thecolorscienceandtheimitationofthefunctionofthehumaneyeoncolorvision.Thesyntheticalgorithmofcolorgatheringbasedonthe4-Dmodelhasbeenproposed.Alineartransformationofthe4-Dspacehasbeentakenanddiferentcharacteristicfunctionshavebeenstructuredaccording

7、tofourkindsoftopographicelementsseparately.Aimingatthecolorerrorproducedintheprocessofprintandscan,thealgorithmhasseparatedthelayersofdiferenttopographicelementsbysynthesizinginformationanddecomposingcomponentsinlayer.Alargenumberoftestsshowsthatthealgorithmiseffic

8、ient,widelyadaptedandhighlyautomatic.Ontheaspectoftherecognitionofcontour,theideathatthethickcontourshouldbeseparatedfromthethincontourbeforereco