電視原理課件1

1、 無線電波無線電波紅外線紅外線紫紫外外線線X射線X射線射線射線10105 5101010101010151510102020101025253103103 3310310-2-2310310-7-7310310-12-12310310-17-17頻率(Hz)頻率(Hz)波長(m)波長(m) 玻璃棱鏡玻璃棱鏡太陽光太陽光偏轉(zhuǎn)角小偏轉(zhuǎn)角小偏轉(zhuǎn)角大偏轉(zhuǎn)角大白色屏幕白色屏幕 標(biāo)準(zhǔn)照明體代表模擬A色溫于2856K完全輻射體的光近日出或日落時之日光B色溫約4874K的直射陽光近正午之陽光C色溫約6740K的平均日光相似北方45度仰角之日光D50色溫約5000K的日光印刷工藝用之標(biāo)準(zhǔn)光D65色溫約6504K

2、的日光平均太陽光D75色溫約7500K的日光相似北方天空之日光 相 對 視 敏 度4004005005006006007007000.20.20.40.40.60.60.80.81.01.0/nm/nm -24-18-12-606121824123456 lgcmfaLb 觀觀察察者者待配彩色待配彩色視場視場光亮調(diào)節(jié)光亮調(diào)節(jié)三三基基色色光光源源R RG GB B ( )( ), ( )rgb， ( )( ) R( ) G( ) BFrgb 780380( )( )eRrd780380( )( )eGgd780380( )( )eBbd1()()NieiiRr 1()()NieiiGg 1()(

3、)NieiiBb rgbX1.2750- 0.27780.0028Y-1.73932.7673- 0.0280Z- 0.74310.14091.6022 0.41850.09120.00090.1580.25240.00250.08280.01570.1786XRYGZB 2.76891.75181.13021.00004.59070.06010.00000.05655.5943XRYGZB2.76891.75181.13021.00004.59070.06010.00000.05655.5943xrygzb y的曲線與明視覺完全一致，這是因為在XYZ色度系統(tǒng)中Y代表亮度。 制式NTSCPAL

4、基色與光源Re1Ge1Be1C白Re2Ge2Be2D65色坐標(biāo)x0.670.210.140.3100.640.290.150.313y0.330.710.080.3160.330.600.060.329 1Re=1 x1X+y1Y+z1Z1Ge=2 x2X+y2Y+z2Z1Be=3 x3X+y3Y+z3Z 1 x1+ 2 x2+ 3 x3 X +1 y1+ 2 y2+ 3 y3 Y+1 z1+ 2 z2+ 3 z3 Z = 1Re +1Ge+ 1Be = Fc白白（1lm）mc xcX+ ycY+ zcZ =Fc白白 (1lm) mc yc 1，mc 1 yc 顯像三基色與XYZ的矩陣表示 為

5、：Re 0.607 0.299 0.000 XGe 0.174 0.587 0.066 YBe 0.200 0.114 1.116 Z逆矩陣表示 為：X 1.910 -0.985 0.058 ReY -0.532 1.999 -0.118 GeZ -0.288 -0.028 0.897 Be 1.9100.5320.2880.9851.9990.0280.0580.1180.879eeeNTSCeNTSCRXXGYAYBZZ 10.6070.1740.2000.2990.5870.1140.0000.0661.116NTSCeeeeeeeNTSCNTSCXRRYAGGZBB 3.06341.39340.47580.96931.87600.04160.06790.22881.0691eeePALePALRX