Digital_camera.ppt

DigitalCamera,英语班学号：,Whatisadigitalcamera?,Whatsthedifferencebetweendigitalcamerasandfilmcameras?Adigitalcamera(alsodigicamorcameraforshort)isacamerathattakesvideoorstillphotographs,orboth,digitallybyrecordingimagesviaanelectronicimagesensor.,Manycompactdigitalstillcamerascanrecordsoundandmovingvideoaswellasstillphotographs.Most21stcenturycamerasaredigital.Digitalcamerascandothingsfilmcamerascannot:displayingimagesonascreenimmediatelyaftertheyarerecorded,storingthousandsofimagesonasinglesmallmemorydevice,recordingvideowithsound,anddeletingimagestofreestoragespace.,TheImageSensor-CCD,EnglishFullname：Charge-coupledDevice，ChineseFullname：电荷耦合元件（CCD图像传感器）InaCCDforcapturingimages,thereisaphotoactive（光敏）region(anepitaxiallayerofsilicon),andatransmissionregionmadeoutofashiftregister(theCCD,properlyspeaking).CCD是一种半导体（semiconductor）器件，能够把光学影像转化为数字信号。CCD上植入的微小光敏物质称作像素（Pixel）。一块CCD上包含的像素数越多，其提供的画面分辨率也就越高。CCD的作用就像胶片一样，但它是把图像像素转换成数字信号。,光敏二极管,像素,垂直移位寄存器,模拟/数字转换器,输出放大器,横向移位寄存器,HowdoesCCDworkinDC?,DigitalcolorcamerasgenerallyuseaBayermask（拜尔滤镜）overtheCCD.Eachsquareoffourpixelshasonefiltered（被过滤的）red,oneblue,andtwogreen(thehumaneyeismoresensitivetogreenthaneitherredorblue).Theresultofthisisthatluminance（亮度）informationiscollectedateverypixel,butthecolorresolution（色彩分辨率）islowerthantheluminanceresolution（感光分辨率）.,Compactdigitalcameras（卡片机）andDigicamstypicallyhavemuchsmallersensorsthanaDigitalSLR（单反机）andarethuslesssensitivetolightandinherentlymorepronetonoise.,CanonPowershotA495Specification,StyleSimpleandEasyMegapixels10FileFormatsJPEGMemoryCardsSD/SDHC/SDXCZoom3.3xFocalShutterSpeed15-1/2000secondsAperturef/3.0-f/5.8SensitivityAUTO,ISO80,100,200,400,800,1600ViewfinderNoLCDScreen2.5inchesShootingModesPortrait,NightSnapshot,Kids&Pets,Indoor,FaceSelf-Timer,LowLight(2.0MP),SuperVivid,PosterEffect,Beach,Foliage,Snow,Fireworks,ImageStabilisationNoExposureCompensation-2EVto+2EV(in1/3EVsteps),类型像素格式变焦快门速度感光度取景器液晶显示屏拍摄模式,防抖曝光补偿,佳能PowershotA495性能参数,￥1000,CompactdigitalcamerasandDigicamstypicallyhavemuchsmallersensorsthanaDigitalSLRandarethuslesssensitivetolightandinherentlymorepronetonoise.,￥,HowmanytechnicaltermsaboutDCdoyouknow?,LCDBRIGHT显示屏亮度30SAUTOOFF30秒自动关闭CARDFORMAT格式化存储卡DATE时间设定LANGUAGE语言设定WHITEBAL白平衡AUTO自动SUNNY太阳光CLOUDY阴天INCANDESCENT白炽灯FLUORESCENT荧光灯CONTINUOUS连拍功能SINGLE单张CONTINUOUS连拍16SHOTS索引方式连拍16张,VGASEQVGA图形阵列（640X480）ULTRAHSQVGA连拍方式（320X240）IMGADJUST调整亮度和对比度STANDARD标准的CONTRAST对比度（+，-）LIGHTEN亮度+（加亮）DARKEN亮度-（变暗）SENS预设等效感光度PRINTSET打印设定BESTSHOT连拍数张相片后，会自动储存一张最佳的相片的功能,SLID