47 – 1920x1080 HDTV
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Publisher Summary
This chapter details a family of high-definition television systems (HDTV) standardized in Society of Motion Picture and Television Engineers (SMPTE) 274M. The systems have image format of 1920x1080, an aspect ratio of 16:9, and square sampling. HDTV equipment based on 1125/60 scanning and 1920x1035 image format, with nonsquare sampling that has been deployed for several years and is standardized in SMPTE 240M. SMPTE 274M represents agreement on colorimetry according to the international standard Rec. 709. The commercial success of 1920x1080 image structure led to the development of SMPTE 295M that defines interlaced or progressive systems for 1920 x 1080 image data in a 1250-line raster. 1920 x 1080 video represents stationary or moving two-dimensional images sampled temporally at a constant rate of 24/1.00l, 24, 25, 30/1.001, 50, 60/1.001 or 60 frames per second. For studio video, the tolerance on frame rate is normally ±10 ppm. In practice, the tolerance applies to a master clock at a high frequency, but for purposes of computation and standards writing, it is convenient to reference the tolerance to the frame rate.