《电子信息专业英语》课件 Lesson 8 Image Sensors.pptVIP

Lesson8ImageSensors

■image[imid?]图像■sensor[sens?,-s?:]传感器■digital[did?it?l]数字的■camera[k?m?r?]照相机■aperture[?p?,tju?]光圈■bright[brait]明亮的■CCD电耦合器件■CMOS互补氧化物半导体■silicon[silik?n,-k?n]硅■diode[dai?ud]二极管Keywords■shutter[??t?]快门■photon[f?ut?n]光子■pixel[piks?l]象素■bottom[b?t?m]底部■microlens[maikr?lenz]微型透镜■amplifier[?mplifai?]放大器■convert[k?nv?:t]转换■astronomical[,?str?n?mik?l,-ik]天文学的■telescope[telisk?up]望远镜■camcorder[k?mk?:d?]便携式摄像机■manufacture[,m?njuf?kt??]制造■fabricate[f?brikeit]制造

■工作任务：数码相机是怎样照相的？图像传感器是怎样成像的？■学习目标：掌握图像传感器的成像原理和图像传感器的类型■重点难点：图像传感器的分类CCD和CMOS■推荐学时：6学时

Digitalcamerashaverootsgoingbackalmost200years.Beginningwiththeveryfirstcameraallhavebeenbasicallyblackboxeswithalenstofocustheimage,anaperturethatdetermineshowbrightthelightis,andashutterthatdetermineshowlongthelightenters.Thebigdifferencebetweentraditionalfilmcamerasanddigitalcamerasishowtheycapturetheimage.Insteadoffilm,digitalcamerasuseasolid-statedevicecalledanimagesensor.Insomedigitalcamerastheimagesensorisacharge-coupleddevice(CCD),whileinothersitsaCMOSsensor.Onthesurfaceofthesefingernail-sizedsiliconchipsaremillionsofphotosensitivediodes,calledphotosites,eachofwhichcapturesasinglepixelinthephotographtobe.

Whenyoutakeapicture,thecamerasshutteropensbrieflyandeachphotositeontheimagesensorrecordsthebrightnessofthelightthatfallsonitbyaccumulatingphotons.Themorelightthathitsaphotosite,themorephotonsitrecords.

2：TypesofImageSensorsFig8-3CCDimagesencor

Fig8-43CCDTechnology

Fig8-5CMOSimagesensor

Imagesensorsaremanufacturedinfactoriescalledwaferfoundriesorfabswherethetinycircuitsanddevicesareetchedontosil