CCIR 601

CCIR 601 is the old name of a standard published by the CCIR (now ITU-R) for encoding interlaced analogue video signals in digital form. The new name of the standard is ITU-R BT.601, but the old name is still in common use in informal contexts. It includes methods of encoding 525 line 60 Hz and 625-line 50 Hz signals, both with 720 luminance samples and 360 chrominance samples per line. The colour encoding system is known as YUV 4:2:2, that being the ratio of Y:Cb:Cr samples (luminance data:blue chroma data:red chroma data). For a pair of pixels, the data are stored in the order Y1:Y2:Cb:Cr, with the chrominance samples co-sited with the first luminance sample.
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CCIR 601 ist der alte Name eines Standards, der durch den CCIR (jetzt ITU-R) veröffentlicht wurde und der festlegt, wie digitale interlaced-Video-Signale zu kodieren sind. Der neueste Name des Standards lautet ITU-R BT 601. Er enthält Methoden, analoge Fernsehsignale mit einer Bildrate von 60 Hz und 525 Zeilen oder alternativ dazu mit einer Bildrate von 50 Hz und 625 Zeilen zu digitalisieren.
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CCIR 601 es la primera norma sobre la televisión digital, encargándose del muestreo de la señal. Se aplica solamente en estudios, sin llevar a cabo ningún tipo de compresión. Dicha norma, ha ido evolucionando desde que fue creada, en los años 80, lo que hace interesante o imprescindible especificar la família de parámetros a los cuales hace referencia. Empezando por la relación de aspecto (4:3 ó 16:9) hasta el submuestreo de las componentes de color que se aplica (4:4:4 ó 4:2:2).
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-CCIR Recommendation 601: image format, acquisition semantic, and parts of the coding for digital standard television signals (PAL, SECAM, NTSC)

See: ITU-R BT.601-2.

Formerly known as CCIR 601. This international standard defines the encoding parameters of digital television for studios. It is the international standard for digitizing component television video in both 525 and 625 line systems and is derived from the SMPTE RP125. ITU-R 601 deals with both color difference (Y, R-Y, B-Y) and RGB video, and defines sampling systems, RGB/Y, R-Y, B-Y matrix values and filter characteristics. It does not actually define the electro-mechanical interface--see ITU-R BT.656. ITU-R 601 is normally taken to refer to color difference component digital video (rather than RGB), for which it defines 4:2:2 sampling at 13.5 MHz with 720 luminance samples per active line and 8 or 10-bit digitizing. Some headroom is allowed with black at level 16 (not 0) and white at level 235 (not 255)--to minimize clipping of noise and overshoots. Using 8-bit digitizing approximately 16 million unique colors are possible: 28 each for Y (luminance), Cr and Cb (the digitized color difference signals) = 224 = 16,777,216 possible combinations. The sampling frequency of 13.5 MHz was chosen to provide a politically acceptable common sampling standard between 525/60 and 625/50 systems, being a multiple of 2.25 MHz, the lowest common frequency to provide a static sampling pattern for both.