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【文章內(nèi)容簡(jiǎn)介】 ormation What about Color? Component Nature of Color R G B Video Color Palette Color Television R = Red G = Green B = Blue B + G = Cyan G + R = Yellow B + R = Magenta NTSC Color Bars Block Diagram of Color Camera Gamma G A measurement of contrast, gamma correction is required because the brightness output of a camera does not correspond to the brightness recognition of the human eye. Composite Color ? Y = Luminance Signal Y =30% red + 59% green + 11% blue ? C = Chrominance Signal C = I Q Matrix Color Matrix ? Saturation = Amplitude of the I and Q signals ? Hue = Phase developed by the difference in amplitude between the I and Q signals Transmitter Tube Color TV Transmitter TV Frequency Allocations 2 4 VHFLo 54 MHz 72 MHz 5 6 VHFLo 76 MHz 88 MHz 7 – 13 VHFHi 174 MHz – 216 MHz 14 – 59 UHF 470 MHz – 746 MHz NOTE: Natural breaks occur between channels 4 and 5。 channels 6 and 7。 and channels 13 and 14. Each channel is 6 MHz wide. NTSC Bandpass Characteristics (Black and White) Color TV Signal NTSC Bandpass Characteristics (Color) Color TV Signal Worldwide Standards ? National Television System Committee NTSC (1953) ? Phase Alternation Line PAL (1967) ? Sequentiel Couleur Avec Memoire SECAM (1967) World TV Standards World TV Standards Prin
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