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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. The ITU Radiocommunication Sector (ITU-R) is a standards body subcommittee of the International Telecommunication Union relating to radio communication. ...
The ITU Radiocommunication Sector (ITU-R) is a standards body subcommittee of the International Telecommunication Union (ITU) relating to radio communication. ...
Interlacing is a method of displaying images on a raster-scanned display device, such as a cathode ray tube (CRT). ...
Video (Latin for I see, first person singular present, indicative of videre, to see) is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion. ...
MHZ redirects here. ...
As applied to analog television signals, two different words are used, luminance and luma, meaning two different things. ...
Chrominance (chroma for short) comprises the two components of a television signal that encode color information. ...
Color is an important part of the visual arts. ...
YUV 4:2:2 is a specific encoding for digital representation of the YUV color space. ...
The CCIR 601 signal can be regarded as if it is a digitally encoded analog component video signal, and thus includes data for the horizontal and vertical sync and blanking intervals. Regardless of the frame rate, the luminance sampling frequency is 13.5 MHz. The luminance sample is at least 8 bits, and the chrominance samples are at least 4 bits each.
The first version of CCIR 601 defined only a parallel interface, but later versions introduced the bit-serial family of serial digital video interfaces that are now commonly used. The 8 bit serial protocol (216 Mbit/s) was once used in D1 digital tape recording. Modern standards use an encoding table to expand the data to 9 or 10 bits for improved behavior over long transmission lines. The 9 bit serial version has a data rate of 243 Mbit/s. By far, the most common version of the interface is the 10-bit Serial Digital Interface (which was later standardized as SMPTE 259M), which is now a ubiquitous interconnect standard for professional video equipment which operates on standard-definition digital video. This format, originally used in D5 digital tape recording, has a data rate of 270 Mbit/s. Additionally, a 360 Mbit/s version of the interface has been defined, which is sometimes used in widescreen applications. Sonys D1 format was the first major professional digital video format, introduced in 1987. ...
The Serial Digital Interface (SDI), standardized in ITU-R BT.656 and SMPTE 259M, is a digital video interface used for broadcast-grade video. ...
The Society of Motion Picture and Television Engineers or SMPTE (pronounced simptee or sometimes sumptee) is a US professional association of engineers. ...
The inner box (green) is the format used in most pre-1952 films and pre-widescreen television. ...
There is an 8 bit version in which only data from the active video periods are transmitted, with a bit rate of only 165.9 Mbit/s.
In each 8 bit luminance sample, the value 16 is used for black and 235 for white, to allow for overshoot and undershoot. The values 0 and 255 are used for sync encoding. The Cb and Cr samples use the value 128 to encode a zero value, as used when encoding a white, grey or black area.
The CCIR 601 video raster format has been re-used in a number of later standards, including MPEG. The Moving Picture Experts Group or MPEG is a working group of ISO/IEC charged with the development of video and audio encoding standards. ...
References
- International Telecommunications Union, ITU-R BT.601
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