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1960 CIE-UCS diagram achromatic point aliasing amplitude axis bandlimited Bandwidth Compression baseband brightness broadcast television camera CCIR channel chromaticity coordinates chrominance signals coding colour balance point colour television colour temperature components convolution curve cut-off delta function dimensions display distortion DPCM effect encoding excitation purity eye's field flicker Fourier transform frame gamma green and blue ideal illuminant illustrated in Figure image spectrum impairment line harmonics line interlacing low-pass filtering luminance signal matrix measured modulation noise NTSC Nyquist rate PAL System perceived colour phosphors picture elements picture quality practical quantised reference white replication reproduced response sampling density sampling frequency saturation scale scanning lines scene sensitivity sine space spatial bandwidth spatial filtering spatio-temporal spectral spectral power distribution subcarrier subjective Table test colour three-dimensional tion transmission tristimulus values two-dimensional vertical spatial frequency video frequencies video signal video spectrum viewing conditions visibility visual wavelength