課件基本原理compatibility mode

ExternalExternalExternal基本原 Copyright?

Presenter:ShijiangFengDepartment:OutlineGammaAdaptiveSCE(SecondaryColorNR(Noise

External External和色 Copyright? ExternalAgendaGamma色溫(ColorTemperature和色域 External 校正校3理想狀態(tài):輸入數(shù)據(jù)線性地顯示在 示器上，右圖曲線一條為γ=2.2的冪指數(shù)曲線，如右

x External a3液晶電視進(jìn)行Gamma有些panel可能本身Gamma不是2.2，我們就可以Gamma校正到2.2附近求的色溫由于液晶電視液晶屏RG求的色溫 External 校正3通常將Panel校正到2.2的一條Gamma曲線，如果panel本身的Gamma是2.2，Gamma校正的結(jié)果將趨于一條 External色溫和色色溫(ColorTemperature)：當(dāng)某一光源所發(fā)出的光的色域(Gamut)：就是指某種備所能表達(dá)的顏色數(shù)量所構(gòu) 的范圍區(qū)域 .y R越大x越大,Lv越大G越大y越大,Lv越大

x External Copyright? (YinContrast)(BrightnessGlobalContrast/BrightnessContrast最亮的場景要調(diào)得跟對比機(jī)一樣，如果對比機(jī)能區(qū)分開，我們要能區(qū)分開。例如：（100:95:90，100:97:95，Brightness最暗的場景要調(diào)得跟對比機(jī)一樣，如果對比機(jī)能區(qū)分開，我們要能區(qū)分開。例如：（0:5:10，0:3:5， ExternalContentDynamicContrast(動(dòng)態(tài)對比度Compressthelessdatapart,andenhancetheAdjustmentisbasedonthehistogramDividethehistogramtosomegrouptoapplydifferentBlack&WhiteStretch（黑電平&白電平擴(kuò)展CompresstheblackandwhiteparttoenhancetheAlsoreferto histogramdataandAPL(AveragePixel ExternalDynamicContrast1/2HistogramCompressthelessdataEnhancetheconcentrated ExternalDynamicContrast2/2DynamicContrastThevalue’srangeisfrom0to0x80.Theeffectofdynamiccontrast whenthevalueislarge.Thevalue’srangeisfrom0to0x10.Theeffectofdynamic eswhenthevalueis在一般場景（APL不高不低）下調(diào)，因?yàn)锳PL影響這兩個(gè)參數(shù)的作用 BlackStretchBlackStretch決定曲線斜率，越小代表壓越低

External? ? 決定暗場景時(shí)要抬高多少??APL WhiteStretch決定WhiteStretch作用范圍，超國此范圍的部份會(huì)被直接內(nèi)插連線.決定曲線斜率，越小代表臺越高WSLimit決定亮場景時(shí)要壓低多少

ExternalAPL ,簡單的說，就是重新

定曲線會(huì)往下偏或者往上偏值越大強(qiáng)度越強(qiáng)，曲線會(huì)向上偏

192 ExternalSCEIntroductionCopyright?MediaTekInc.All Hon/uetituraSalGobal

esUlrateEx這個(gè)就是UI上調(diào)節(jié)飽和度，和色響所有，會(huì)影候動(dòng)到度的以叫的顏色飽和度和色度，所lolbaG Saturation

x x xx SaturationxxOutline

ExternalIntroductionColorSCEBlockHueSCEDescriptionPartialPartialPartialPartial ExternalColorSpaceOverviewColoramathematicalrepresentationofasetofThreepopularcolorRGB:usedincomputerYIQ/YUV/YCbCr:used OurIC colorRGB,YUV,Our pathcolorRGB,YCbCr, ExternalColorRGBColorRGBR,G, Color

ExternalYhasarangeof16-CbandCrhavearangeof16-AttentionshouldbepaidtotherangeofRGBwhencovertYCbCrto YCbCr(235,64,73)=>RGB(167,324,126)Sat Cb2CrHue

1Cr Introduction-

ExternalTheHSIcolormodelrepresentseverycolorwiththreecomponents:hue(H),saturation(S),Intensity(I). SCEBlockDiagramSCE(SecondaryColor

External

YSH

Y

All

ExternalHueDivision28huephase:morefinehuephaseatskinPartialYonly16–PartialSat/HuePartialYonly161

0Cb099 ExternalYonHue(PartialLuma)Usage:ChangelumaofdifferenthueExample:ifwewanttoturntheluminanceofskintone ExternalPartialSaturationUsage:ModifysaturationonspecificExample:Enhancesaturationofskin ExternalPartialUsage:ModifyhueangleofspecifichueExample:Turnskintone ExternalSharpnessCopyright?MediaTekInc.All 2D

Agenda

External HSharpness1/2

ExternalY_out=Y_out=Y_in+

HSharpness2/2

ExternalHSharpislocatedbefore3Low,Middle,PositiveandNegativeCoring–TopreventfromenhancingthesharpnessoffalsearisingfromnoiseorTolimittheenhancelevelineachbandofToavoidtheovershoot/undershootorringing External

-DYout

Coring

DYinGain , Gain x DYin xDY 2DSharpness

External

····

··2DLumaSharpnessY_out=Y_in+

HorizontalhighHorizontalhighVerticalhighband3Verticalmiddleband5Xtypecrossover3x3Xtypecrossover5x5ExternalNRIntroductionCopyright?MediaTekInc.All ExternalOutlineNRBlock2DNR3DNR NRBlockDiagram

External01

010*Onlyone2DNR+3DNR,eithermainorsubcanuse External2DNRBlockDiagram

8-

Y_out=Y_In*(8-Blending_level)+Filter_out*Blending_level 3DNRBlockDiagram

ExternalYY

*CisthesameasLookupLookup3D3D Y_out=Y_in*(0xF–w