02.hardware, api, systems

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1、ComputerGraphicsChapter2Hardware,API,SystemsDr.LiJijun(李际军)CollegeofComputerScience,ZhejiangUniversityHardcopyDevicesPlotter:flatbed,drum.Vectorbasedwithcolorpens.DotMatrixPrinter:Rasterbased.7to24scanlines(=pinheads)atatime.LaserPrinter:Rasterbased.Laserbeamdischargesapre-chargeddrumtob

2、indapowderedtoner.Then,heatfusesthedrytonertopaper.ColorPrintingTechnologiesInkJetSpraysmicroscopicdotsofinkthroughsmallholestoformdotsonpaper.ThermalWaxCreatescolorsbymeltingandbondingcolorwaxdots(CMYKorRGB)onto(special)paper.DyeSublimationCreatescontinuous-tonebyheatingCMYKdyesuntilthe

3、yturnintogas(sublimate),thatfusesintothepaper.FilmRecorderAcamerainfrontofadesignatedB&WCRT.RGBchannelsaresentoneatatimethroughanappropriatefilter.StandardInputDevicesKeyboard-Foralphanumericinput.Mouse/Trackball-Atwodegreesoffreedomdevicecontrolledbyrollingaball.-Providesrelativemovemen

4、tinformation.2DInputDevicesJoystick-Controlledbypotentiometers.-Providesrelativemovementinformation.Digitizer/Tablet-Controlledbyelectro-magneticorsonarsensing.-Providesabsolutepositioninformation.TouchScreen-ACRTscreenthatcansensepressureonitssurface.LightPen-SynchronizedwiththeCRTscan,

5、itcanlocateapositiononscreen.3DInputDevicesWiredGlove/DataGloveProvidessixdegreesoffreedom(threerotation/translation)HeadMountedDisplayMeasurespositionandorientationliketheWiredGloveSpaceBallSixdegreesoffreedomsphere(threerotation/translation)HapticDevicesSixdegreesoffreedomwithForceFeed

6、backbyPhillipHeckinger(3Dmodeller)1994ImageCaptureDigitalCamerasCapturebyCCD(ChargedCoupleDevice)Highresolutions:3-5MegaPixelsVideoCameraCaptureanarrayofimagepixelsbyCCD.Lowresolution.AnalogorDigital.ScannerDigitizesahardcopyimage.Highresolution.MoreImageCaptureDevicesThermalimagingNonvi

7、sibleimagesIRismappedtovisiblerangeUltrasoundHighfrequencysoundwavesareconvertedtoformanimage.Nonrectangularacquisitiondevice.3DScannersCT/MRI3DImagingRadiationontissue3DRangeScannerNon-contactGeometryandcolortexturedigitizerUseslaser-lightstripetriangulationLCDtechnology