Rec. 601

ITU-R Recommendation BT.601, more commonly known by the abbreviations Rec. 601 or BT.601 (or its former name CCIR 601) is a standard originally issued in 1982 by the CCIR (an organization, which has since been renamed as the International Telecommunication Union  Radiocommunication sector) for encoding interlaced analog video signals in digital video form.[1] It includes methods of encoding 525-line 60 Hz and 625-line 50 Hz signals, both with an active region covering 720 luminance samples and 360 chrominance samples per line. The color encoding system is known as YCbCr 4:2:2.

Rec. 601
Rec. 601 chromaticity diagram, with 625-line (PAL and SECAM) and 525-line (NTSC SMPTE C primaries) areas shown in black and white
First published1982; 41 years ago (1982)
Latest versionBT.601-7
March 8, 2011; 11 years ago (2011-03-08)
AuthorsITU-R (CCIR)
Base standardsRec.601, BT.601, CCIR 601
Related standardsISO/IEC MPEG, ITU-T H.26x
DomainDigital image processing

The Rec. 601 video raster format has been re-used in a number of later standards, including the ISO/IEC MPEG and ITU-T H.26x compressed formats, although compressed formats for consumer applications usually use chroma subsampling reduced from the 4:2:2 sampling specified in Rec. 601 to 4:2:0.

The standard has been revised several times in its history. Its seventh edition, referred to as BT.601-7, was approved in March 2011 and was formally published in October 2011.

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