6版 Project 23 課文及翻譯

電子與通信技術(shù)專業(yè)英語電子信息工程學院Project23Self-DrivingCar

Self-DrivingCarAself-drivingcaruseacombinationofcomputervision,imagerecognitionanddeeplearningtobuildautomatedskillatpilotingavehiclewhilestayinginagivenlaneandavoidingunexpectedobstructions,suchaspedestrians.Essentially,aself-drivingcarneedstoperformthreeactionstobeabletoreplaceahumandriver:toperceive,tothink,andtoact.Thesetasksaremadepossiblebyanetworkofhigh-techdevicessuchascameras,computersandcontrollers(asshowninFig.23-1).自動駕駛汽車自動駕駛汽車是結(jié)合計算機視覺、圖像識別和深度學習而建立的自動駕駛技能，它能使汽車自動在給定車道上駕駛和避開意外障礙物,例如行人。從本質(zhì)上講,一輛自動駕駛汽車需要執(zhí)行三個動作才能取代人類駕駛員:感知、思考和行動。這些任務(wù)是由高科技設(shè)備組成的網(wǎng)絡(luò)實現(xiàn)的，如攝像頭、計算機和控制器（如圖23-1所示）。

Aself-drivingcar's"sight"or"perceptionisachievedviaseveralmechanisms.Camerasareinstalledontheroofandinotherplacesaroundthecarfor360°vision(asshowninFig.23-2).Whilecamerasaregoodforidentifyingshapesandcolorsintheenvironment,theyarenothelpfulinfindingthedistancetoanobject.自動駕駛汽車的“視覺”或“感知”是通過幾種機制實現(xiàn)的。攝像頭安裝在車頂和汽車周圍的其他地方，可實現(xiàn)360°視野（如圖23-2所示)。雖然攝像頭有利于識別環(huán)境中的形狀和顏色，但它們對于確定與物體的距離沒有幫助。Fortunately,self-drivingcarsalsohavehigh-techsensors,calledLIDARs,thataremuchbetteratdeterminingthelocationofpeopleandobjectsaroundthecar.LIDAR(LightDetectionandRanging)isadevicewithaconstantlyrotatinglaserbeam.Itsendsinvisiblelightpulsesallaroundit.Bymeasuringthetraveltimeandlocationofthereflectedlaserlight,itcandiscriminatetheshapeandlocationofsurroundingobjects.InadditiontocamerasandLIDARs,self-drivingcarsoftenhaveconventionalradarstectingmovingobjectsandaremuchcheaperthantheotherdevices.幸運的是,自動駕駛汽車還配備了高科技傳感器,稱為激光雷達(即光探測和測距)。可以更好地確定汽車周圍人和物體的位置。激光雷達是一種具有不斷旋轉(zhuǎn)的激光束的裝置。它向四周發(fā)送不可見的光脈沖。通過測量反射激光的傳播時間和位置,它可以識別周圍物體的形狀和位置。除了攝像頭和激光雷達，自動駕駛汽車通常還配備有傳統(tǒng)的雷達。雖然雷達只能看到非常模糊的東西,但它們非常擅長探測移動的物體,而且比其他設(shè)備便宜得多。Onceaself-drivingcar"sees"itssurroundings,thecameras,LIDARsandradarsallsendtheinformationtheyperceivetothe"brain"ofthecar.The"brain"ofaself-drivingcarisapowerfulcomputerthatoftensitsinthetrunkandcontrolsthecar'sthoughtsandactions.ByuseofGPS.Itinitiallyhasaroughideaoftherouteitmustfollowtogettoadestination.Thisisnotenough,however.tonavigatealongabusystreet,tochangelanesortostopatatrafficlightwhennecessary.Therefore,thecomputertakesincamera,LIDAR,radarandGPSdataanddeterminesthepreciselocationofthecaraswellastheobjectsaroundit.Programmershavedevelopedverysmartalgorithmsthatcanbe"trained"toidentifyobjectsinthecar'ssurroundings.一旦一輛自動駕駛汽車“看到”周圍的環(huán)境,攝像頭、激光雷達和雷達都會將它們感知到的信息發(fā)送到汽車的“大腦”。自動駕駛汽車的“大腦”是一臺功能強大的計算機,它通常位于后備箱里,控制著汽車的思想和行動。通過使用全球定位系統(tǒng)，它最初對到達目的地必須遵循的路線有一個大致的概念。然面，這還不足以在繁忙的街道上行駛、變換車道或在必要時在紅綠燈處停車。因此，計算機接收攝像頭、激光雷達、雷達和GPS的數(shù)據(jù),并確定汽車及其周圍物體的精確位置。程序員已經(jīng)開發(fā)出非常智能的算法,可以“訓練”識別汽車周圍環(huán)境中的物體。Oncethecomputerhasdeterminedwhichobjectssurroundthecarandhowfarawaytheyare,itmustdecidehowtoactandthenexecuteitsdecision.Oncethecar'scomputerdecideswhatactiontotake,itsendselectroniccommandstocontrollersthatturnthesteeringwheelandcontrolthethrottleandbrakes.

一旦計算機確定了哪些物體圍繞在汽車周圍以及它們離汽車有多遠,它就必須決定如何行動,然后執(zhí)行它的決定。一旦汽車的計算機決定采取什么行動,它就會向控制器發(fā)送電子指令，由這些控制器轉(zhuǎn)動方向盤，并控制油門和剎車。Self-drivingcarswillpotentiallyhaveahugepositiveimpactonoursafetyandlifestyle.Thehigh-techvisionsystemhasthepotentialtooutperformhumansindetectingdangeroussituations.Additionally,thesmartalgorithmswillfindfasterroutestoourdestinations,drivemoreefficientlyandconsumelessfuel.Self-drivingcarsareanexcitingnewtechnologythathasthepotentialtodeeplytransformtransportation,