YUV


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YUV

The color encoding system used for analog television worldwide (NTSC, PAL and SECAM). The YUV color space (color model) differs from RGB, which is what the camera captures and what humans view. When color signals were developed in the 1950s, it was decided to allow black and white TVs to continue to receive and decode monochrome signals, while color sets would decode both monochrome and color signals.

Luma and Color Difference Signals
The Y in YUV stands for "luma," which is brightness, or lightness, and black and white TVs decode only the Y part of the signal. U and V provide color information and are "color difference" signals of blue minus luma (B-Y) and red minus luma (R-Y). Through a process called "color space conversion," the video camera converts the RGB data captured by its sensors into either composite analog signals (YUV) or component versions (analog YPbPr or digital YCbCr). For rendering on screen, all these color spaces must be converted back again to RGB by the TV or display system.

Mathematically Equivalent to RGB
YUV also saves transmission bandwidth compared to RGB, because the chroma channels (B-Y and R-Y) carry only half the resolution of the luma. YUV is not compressed RGB; rather, Y, B-Y and R-Y are the mathematical equivalent of RGB. See color space conversion and YUV/RGB conversion formulas.

Composite Video and S-video
The original TV standard combined luma (Y) and both color signals (B-Y, R-Y) into one channel, which uses one cable and is known as "composite video." An option known as "S-video" or "Y/C video" keeps the luma separate from the color signals, using one cable, but with separate wires internally. S-video is a bit sharper than composite video.

Component Video
When luma and each of the color signals (B-Y and R-Y) are maintained in separate channels, it is called "component video," designated as YPbPr when in the analog domain and YCbCr when it is digital. Component video is the sharpest of all.

The Term Is Generic
In practice, YUV refers to the color difference encoding system whether composite or component, and "YUV," "Y, B-Y, R-Y" and "YPbPr" are used interchangeably for analog signals. Sometimes, "YCbCr," which is digital, is used interchangeably as well, which does not help to clarify the subject. See YPbPr, YCbCr, luma, ITU-R BT.601, YIQ and chroma subsampling.


Video Connections
Analog video can be transmitted as composite video, S-video or component video. High-end consumer and professional equipment uses component analog video (YPbPr) and three separate cables.








YUV Out
The top diagram shows how YUV signals are mixed and distributed to outside connectors, and the device on the bottom shows the actual ports from an NVIDIA graphics card. (Bottom image courtesy of NVIDIA Corporation.)



YUV Out
The top diagram shows how YUV signals are mixed and distributed to outside connectors, and the device on the bottom shows the actual ports from an NVIDIA graphics card. (Bottom image courtesy of NVIDIA Corporation.)








Analog or Digital?
The outputs on the back of this DVD player are really analog (YPbPr), but designated as Pb/Cb and Pr/Cr just to cover all bases. YPbPr and YCbCr are often used interchangeably, and erroneously.
References in periodicals archive ?
Although the segmentation effect with Log edge detection is superior to the FCE-based approach applied in the HSV and YUV spaces, it performs not well as the proposed approach applied in the RGB color space, as shown in Figures 11 and 12.
Before we faced difficulty to sell milk in the market but now YUV comes and collect the milk to sell in the market so it's very helpful for us," added Leimapokpam Nimobala Devi, another farmer.
Their study involved the test of four color spaces, RGB, HSV, CMY, and YUV, in order to identify the best color representation.
[15] Bulatov VV, Vladimirov YuV. Wave dynamics of stratified mediums.
A color image in the RGB space with pixels normalized in [0,1] is converted to YUV space via the formula [5]
A corresponding AVI file format of approximately 1.2 GB was saved, with the following properties: 100 fps, 656x490 px, YUV 4:2:2 (16 bits/pixel avg.).
It also features six layers of overlay window displays, with an alpha plane and constant alpha value for each layer, and two separate video-capture units that support YUV, RGB, ITU656, and other formats.
(3) BT.601 Transport Over IEEE-1394: A transport protocol for sending BT.601 video streams (YUV, RGB, etc.) over 1394 Automotive, promulgated by the 1394 Trade Association.
La desventaja de este espacio es que presenta redundancia de informacion entre los tres colores, para salvar esto es posible realizar una conversion a otro espacio de color, por ejemplo al YUV. Las formulas para la conversion son:
Out of the box, users can test for composite, S-Video, HD (component) and HDMI signals including NTSC-M, NTSC-4.43, PAL-M, PAL-N, RGB, and YUV. Audio test capabilities include S/PDIF, PCM, Raw Dolby Digital, and DTS.
Evaluation parameters and values Planes U and V planes of YUV color system Belt width 8 pixels Shift vector (6, 6) Payload 64 bits Cell size 104 x 104 pixels Table 2.
Nine nonsense syllables were employed in the study (ZID, BIH, ROG, QAT, VEK, DUT, CAJ, YUV, and HEZ) and, in the interests of clarity, will be referred to by the alphanumerics A1, A2, A3, B1, B2, B3, C1, C2, and C3.