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DigitalCamera制作人：范景红英语０７１００２班学号：２００７１００１０２０４Whatisadigitalcamera?•What’sthedifferencebetweendigitalcamerasandfilmcameras?•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•Style－－－－－－－－SimpleandEasy•Megapixels－－－－10File•Formats－－－－－－－JPEGMemoryCardsSD/SDHC/SDXC•Zoom－－－－－－－－3.3xFocal•ShutterSpeed－－－－15-1/2000secondsAperturef/3.0-f/5.8•Sensitivity－－－－－－－AUTO,ISO80,100,200,400,800,1600•Viewfinder－－－－－－－No•LCDScreen－－－－－－2.5inches•ShootingModes－－－－Portrait,NightSnapshot,Kids&Pets,Indoor,FaceSelf-Timer,LowLight(2.0MP),SuperVivid,PosterEffect,Beach,Foliage,Snow,Fireworks,•ImageStabilisation－－－－－－No•ExposureCompensation－－－－-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.￥７７００HowmanytechnicaltermsaboutDCdoyouknow?•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Ｌｅｔ‘ｓｔｒｙｍｏｒｅ～•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•SLIDESHOW播放幻灯片方式•DELETE删除•SELECTED删除单张•AELOCK自动曝光锁定•ALL全部FOLDERS文件夹NORMAL普通模式•BASIC经济模式LENS外挂镜头NORMAL标准镜头•WIDE广角镜头TELEFOTO望远镜头FISHEYE鱼眼镜头