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1、视频信号的获取与处理（Acquisitionandprocessingofvideosignal）AcquisitionandprocessingofvideosignalThebasicconceptof3.1.1colorMultimediacomputerprocessingimageandvideo,mustfirstcontinuousimagefunctionf(x,y)spaceandDiscretizationofamplitudeanddiscretizationofspacecontinuouscoordinate(x,y)arecalledsampl
2、ing;discretizationofF(x,y)color,Quantization.Thecombinationofthetwodiscretizationiscalleddigitization,andtheresultofdiscretizationiscalleddigitalimageBrightness,hue,saturationYbrightness:theintensityandweaknessoflight.Htone:thewavelengthoflight,thesenseofthehumaneye(reflection)color(theba
3、siccharacteristics).Ssaturation:thedegreeofcolorpenetrationintothewhitelight(indicating)thedepthofcolor.Red+whitepinksaturationdropsTheredandtheothercolorschangeTheprincipleofthreeprimarycolors(RGB):Allkindsofcolorlightinnaturearemadeupofthreecolorsofred(R),green(G)andblue(B)indifferentpr
4、oportions,Also,mostcolorscanbebrokenintored,green,blueThreeshadesofcolor,whichisthemostbasicprincipleofcolorimetry--theprincipleofthreeprimarycolors.RGBisnotcompatiblewithblackandwhiteTVsignals.ItishopedthattheairlaunchedsignalswillbeconvertedintoYUVsignals.Whenthebrightnessofwhitelightis
5、expressedbyY,therelationbetweenredandgreen,greenandbluecanbedescribedbythefollowingequation:Y=0.299R+0.587G+0.114B3.1.2colorspace1.RGBspaceTheequationofcolormatchingcanbewritteninanycolorlightF:F=r[R]+g[G]+b[B]Amongthem,R,G,BarethreecoefficientsR=1redAfternormalization,r+g+b=1isg=1GreenB=
6、1blue2.YUVandYIQcolorspaceYUVspacewithPALYIQspacewithNTSCBrightnessYColordifferenceUVY=0.3R+0.59G+0.11BU=m(B-Y)=0.493(B-Y)V=n(R-Y)=0.877(R-Y)ColordifferencebetweenB-YandR-Y.Y0.30.590.11RU=-0.15-0.290.44GV0.61-0.52-0.096BY=0.3R+0.59G+0.11BThebenefitsofusingYUVandYIQ:(1)luminancesignalYsolv
7、estheproblemofcompatibilitybetweencolorTVandblackandwhitetv.(2)alargenumberofexperimentsshowthatthehumaneyeisnotsensitivetothecolordifferencesignal,andisparticularlysensitivetothebrightnesssignal.Ybandwidth4.43MHz(PAL)(becausesensitive)U,Vbandwidth1.3MHz(becauseinse
