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YPbPr

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Subject: Color space, S-Video, YCbCr, PlayStation Portable, History of video game consoles (sixth generation)
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YPbPr


YPBPR is the analog video signal carried by component video cable in consumer electronics. The green cable carries Y, the blue cable carries PB and the red cable carries PR.

YPBPR[1] is a color space used in video electronics, in particular in reference to component video cables. YPBPR is the analog version of the YCBCR color space; the two are numerically equivalent, but YPBPR is designed for use in analog systems whereas YCBCR is intended for digital video.

YPBPR cables are also commonly referred to as Yipper cables.[2] YPBPR is commonly called "component video" by manufacturers, but this is imprecise, as there are many other types of component video, most of which are some form of RGB.

Some video cards come with video-in video-out (VIVO) ports for connecting to component video devices.

Contents

  • Technical details 1
  • YPBPR advantages 2
  • References 3
  • External links 4

Technical details

YPBPR is converted from the RGB video signal, which is split into three components: Y, PB, and PR.

  • Y carries luma (brightness or luminance) and synchronization (sync) information. Y = 0.2126 R + 0.7152 G + 0.0722 B. Before the advent of color television, the Y axis on an oscilloscope display of a video waveform represented the intensity of the scan line. With color, Y still represents intensity but it is a composite of the component colors.
  • PB carries the difference between blue and luma (B − Y).
  • PR carries the difference between red and luma (R − Y).

Sending a green signal would be redundant, as it can be derived using the blue, red and luma information.

When color signals were first added to NTSC-encoded black and white video standard, the hue was represented by a phase shift of a color reference sub-carrier. P for phase information or phase shift has carried through to represent color information even in the case where there is no longer a phase shift used to represent hue. Thus, the Y PB PR nomenclature derives from engineering metrics developed for the NTSC color standard.

The same cables can be used for YPBPR and composite video. This means that the yellow, red, and white RCA connector cables commonly packaged with most audio/visual equipment can be used in place of the YPBPR connectors, provided the end user is careful to keep track of the device functions (i.e., connect any one of the individual functions to the corresponding function on the other end using any cable color).

YPBPR advantages

Female RCA connectors used to output YPBPR component video from a set-top-box, DVD player or similar device. Female connections in this configuration are also used for YPBPR inputs on display devices such as TVs.

Signals that use YPBPR offer enough separation that no color multiplexing is needed, so the quality of the extracted image is nearly identical to the signal before encoding. S-Video and composite video mix the signals together by means of electronic multiplexing; however, more often than not the signal is degraded at the display end as the display is not able to separate the signals completely. It is possible for their multiplexed counterparts to interfere with each other (see dot crawl).

Among consumer analog interfaces, only YPBPR and analog RGB component video are capable of carrying non-interlaced video and resolutions higher than 480i or 576i, up to HD ready for YPBPR.

References

  1. ^ Often written YPbPr and also referred to as Y/PB/PR, YPRPB, PRPBY, PBPRY, Y/Pb/Pr, YPrPb, PrPbY, PbPrY, Y/R-Y/B-Y, Y(R-Y)(B-Y), Y, R-Y, B-Y.
  2. ^ High-Def Terminology at Amazon.com

External links

  • Color FAQ, Charles Poynton
  • Color formats for image and video processing - Color conversion between RGB, YUV, YCbCr and YPbPr.
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