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Topic: Luminance (video)


    Note: these results are not from the primary (high quality) database.


  
 Television and Video Glossary
Analog Component Video -- Refers to a standard consisting of analog video signals transmitted on three wires, one for luminance (Y), one for the red component from which is subtracted the total luminance (R-Y), and one for the blue component from which is subtracted the total luminance (B-Y).
Composite Video -- Refers to a video signal where both the luminance component and the color component(s) are transmitted on a single wire or broadcast in a limited bandwidth.
This is true because as the video standards (NTSC, etc.) were defined, the luminance signal was given a larger bandwidth to permit the carrying of all of the picture detail while the color signal was deliberately constrained to consume less bandwidth and consequently possess less detail.
www.geocities.com /columbiaisa/tv_video_glossary.htm   (10842 words)

  
 S-Video - Wikipedia, the free encyclopedia
In composite video, the luminance signal is low-pass filtered to prevent crosstalk between high-frequency luminance information and the color subcarrier.
The luminance performance of S-Video is noticeably better than composite video; the chrominance performance with reduced crosstalk also shows noticeable improvement.
S-Video will appear better than composite video since the television does not have to split the brightness and color information that are found together on composite video.
en.wikipedia.org /wiki/S-video   (606 words)

  
 Video Glossary
The structuring of the video signal whereby color and luminance signals are kept separate from one another using the color-subtraction method Y (luminance), B—Y (blue minus luminance) and R—Y (red minus luminance), with green derived from a combination.
A video effect wherein a particular area of color (i.e., range of chrominance) is removed from one video signal and replaced with a different signal.
Digital video that is essentially the digitized waveform of NTSC or PAL video signals, with specific digital values assigned to the sync, blank, and white levels.
www.profim.ch /News/MandVGlossary.HTML   (606 words)

  
 S-Video - Wikipedia, the free encyclopedia
In composite video, the luminance signal is low-pass filtered to prevent crosstalk between high-frequency luminance information and the color subcarrier.
The luminance performance of S-Video is noticeably better than composite video; the chrominance performance with reduced crosstalk also shows noticeable improvement.
S-Video will appear better than composite video since the television does not have to decode the brightness and color information that are found together on composite video.
en.wikipedia.org /wiki/S-Video   (606 words)

  
 John McGowan's AVI Overview: Authoring and Related Topics
Composite video signals are analog signals that combine luminance and chrominance (color) information in a single analog signal that can be transmitted over a single wire or stored in a single track on an analog magnetic tape.
Composite video is particularly prone to errors in reproducing exact colors due to the overlap of the color and luminance signals.
In component video, the luminance (Y) and two color difference signals (U and V or I and Q) are separated into three separate analog signals that can be transmitted over three separate wires or stored in three separate tracks on an analog tape, or digitized separately.
www.jmcgowan.com /aviauthor.html   (8758 words)

  
 S-Video - Wikipedia, the free encyclopedia
In composite video, the luminance signal is low-pass filtered to prevent crosstalk between high-frequency luminance information and the color subcarrier.
Separate video, abbreviated S-Video and also known as Y/C (or erroneously, S-VHS and "super video") is an analog video signal that carries the video data as two separate signals (brightness and colour), unlike composite video which carries the entire set of signals in one package.
Due to the separation of the video into brightness and colour components, S-Video is sometimes considered a type of component video signal, although it is also the most inferior of them, quality-wise, being far surpassed by the more complex component video schemes (like RGB).
en.wikipedia.org /wiki/S-Video   (844 words)

  
 S-Video - Wikipedia, the free encyclopedia
In composite video, the luminance signal is low-pass filtered to prevent crosstalk between high-frequency luminance information and the color subcarrier.
Separate video, abbreviated S-Video and also known as Y/C (or erroneously, S-VHS and "super video") is an analog video signal that carries the video data as two separate signals (brightness and colour), unlike composite video which carries the entire set of signals in one package.
Due to the separation of the video into brightness and colour components, S-Video is sometimes considered a type of component video signal, although it is also the most inferior of them, quality-wise, being far surpassed by the more complex component video schemes (like RGB).
en.wikipedia.org /wiki/S-Video   (806 words)

  
 MPEG-2 video compression
One method of determining the motion that has occurred between the block being coded and the reference frame is a 'block-matching' search in which a large number of trial offsets are tested by the coder using the luminance component of the picture.
The coded luminance and chrominance prediction error is combined with 'side information' required by the decoder, such as motion vectors and synchronising information, and formed into a bitstream for transmission.
In video systems other than television, non-interlaced video is commonplace (for example, most computers output non-interlaced video).
www.bbc.co.uk /rd/pubs/papers/paper_14/paper_14.html   (4263 words)

  
 Video Color Resolution Basics
By formatting video as a luminance signal and two color component signals, the latter two can be carried at much less resolution, saving on storage and transmission space requirements.
Lower color resolution is the result of the need to reduce the total video signal content to fit within the allotted bandwidth, spectrum space, or bit rate, taking into account the lesser sensitivity of the human eye to fine color detail, and also a result of holding down the costs of manufacturing of equipment.
Video professionals use for this distance the height of the picture as displayed on the screen.
members.aol.com /ajaynejr/vidcolor.htm   (4263 words)

  
 What is S-Video? - A Word Definition From the Webopedia Computer Dictionary
Short for Super-Video, a technology for transmitting video signals over a cable by dividing the video information into two separate signals: one for color (chrominance), and the other for brightness (luminance).
When sent to a television, this produces sharper images than composite video, where the video information is transmitted as a single signal over one wire.
Most digital video devices, such as digital cameras and game machines, produce video in RGB format.
www.webopedia.com /TERM/S/S_Video.html   (430 words)

  
 component vs S video - Car Forums and Automotive Chat
In Component video, one of the cables is for chrominance, and for the other two it is the luminance that is actually split into two signals.
In S-Vid, there are actually two cables in the jacket that separate chrominance and luminance.
View Full Version : component vs S video
www.automotiveforums.com /t275186.html   (715 words)

  
 TFT-LCD targets industrial apps
The display offers a high luminance of 400cd/m² and a wide color gamut of 72 percent, which is equivalent to that of a cathode-ray tube (CRT).
Featuring NEC LCD Technologies' proprietary ultra-advanced, super-fine TFT (UA-SFT) technology, which enables ultra-wide viewing angles, high luminance, a wide color gamut and high contrast ratio, this new VGA LCD is said to offer an equivalent brightness level and added energy savings of approximately 45 percent compared to the XGA model.
In response to increasing demand for more cost-efficient UA-SFT-based LCDs for industrial applications, NEC Electronics America Inc. has introduced a new 8.4-inch (21-centimeters-diagonal) video graphics array (VGA), amorphous silicon, thin film transistor liquid crystal display (TFT-LCD) module.
www.eetasia.com /ART_8800378401_480700_b395df95.HTM?from=RSS   (295 words)

  
 Video Engineering Primer
If, however, you are not changing the video signal because you are working with a basic editing system without any additional equipment, then except for degadations caused by generation loss, the colors and luminance of your edited tape should be the same as your source tape.
Each of the 30 frames of a video picture includes these two interlaced fields so the actual scanning rate is 60 fields per second.
Together they are called the television composite waveform, more commonly referred to as composite video.
www.videouniversity.com /engineer.htm   (1584 words)

  
 Section 2: Luminance, Luminance, Luminance!
Luminance Rule 1: For minimum text readability, the difference between the luminance of a background and the foreground text should be no less than 0.50.
The Luminance rules might seem to be an enormous creative constraint, but the rules actually make it easier to test your color combinations for visibility problems in a scientific and consistent way.
Luminance Rule 2: Having the foreground objects presented in color while using a monochrome background, or any other combination* of color and black and white, does not allow you to avoid Luminance Rule 1.
nemesis.lonestar.org /reference/internet/web/color/luminance.html   (2062 words)

  
 Luminance
The luminance signal is formed by combining a proportion of 30% red, 59% green and 11% blue from the colour signal.
This combined output becomes the luminance (brightness/ monochrome) signal.
Video: A component, the black and white signal (the brightness signal) in colour television.
www.screensound.gov.au /glossary.nsf/Pages/Luminance?OpenDocument   (104 words)

  
 Component video - Wikipedia, the free encyclopedia
S-Video is another type of component video signal, because the luminance and chrominance signals are transmitted on separate wires.
Component video is capable of producing signals such as 480p, 720p, 1080i and 1080p, but digital connections such as DVI (video only) and HDMI (which can also include up to 8 channels of audio) give better results at the higher resolutions (up to 1080p).
Component video can be contrasted with composite video (such as NTSC or PAL) in which all the video information is combined into a single signal such as a TV broadcast.
en.wikipedia.org /wiki/Component_video   (788 words)

  
 Videocassette recorder - Wikipedia, the free encyclopedia
Macrovision is a system that reduces the quality of recordings made from commercial video tapes, DVDs and pay-per-view broadcasts by adding random peaks of luminance to the video signal during vertical blanking.
DVD Video Recorders and Digital video recorders such as TiVo have recently begun to drop in price in developed countries, signaling the end is near for VCRs in those markets.
The videocassette recorder (or VCR, more commonly known in the British Isles as the video recorder), is a type of video tape recorder that uses removable videotape cassette containing magnetic tape to record audio and video from a television broadcast so it can be played back later.
en.wikipedia.org /wiki/Video_cassette_recorder   (1506 words)

  
 Video Engineering Primer
If, however, you are not changing the video signal because you are working with a basic editing system without any additional equipment, then except for degadations caused by generation loss, the colors and luminance of your edited tape should be the same as your source tape.
To see the various elements of the composite video signal two special test oscilloscopes are used - the waveform monitor and the vectorscope.
Together they are called the television composite waveform, more commonly referred to as composite video.
www.videouniversity.com /engineer.htm   (1584 words)

  
 Component Video Cables from Blue Jeans Cable
Component video can be run at any resolution, unlike composite and s-video which are 480i formats, and, as a result of having the color signal split three ways (luminance and two color-difference signals), provides the best color rendition.
Any component video cable, electrically speaking, is just a set of three cables for the Y, Pb, and Pr components of the signal; but most people prefer their component video cables to come in the form of a single bundle for neatness and ease of installation.
Bundled component video cable is useful in applications where appearance and convenience of use are important, but unbundled cables--delivered as three separate cables of equal length--provide the same performance at lower cost.
www.bluejeanscable.com /store/component   (1249 words)

  
 Using a Video Mixer
A video mixer is a sophisticated electronic device that can combine two or more video sources in a variety of ways.
A mixer is a very flexible video production tool.
The Videonics Digital Video Mixer lets you use sound from either source or from an external source.
www.focusinfo.com /articles/MXEDIT.html   (1249 words)

  
 MX-50 - Panasonic MX-50 Video Mixer Quick Reference Guide
Y/C - A combination of video signals that connect the inputs and outputs of video equipment in which the luminance ("Y"), or brightness portion of the signal, and the chrominance ("C"), or color portion of the signal, travel through two separate lines which are typically encased in one cable.
Also, the principal on which Panasonic digital video mixers work: Rather than depending upon genlockable cameras or time-base corrected VCRs, incoming video signals are immediately converted from analog to digital and it is in the digital domain that these signals can be mixed and/or processed.
Differs from a frame synchronizer in that it digitally "grabs" one line of video, stabilizes it, strips off the old sync information, adds new perfectly-timed sync information, often times compensates for video tape drop-outs, and then "spits out" the line in time to grab and process another.
www.studio1productions.com /Articles/MX50QRG.htm   (1249 words)

  
 8 mm video format - Wikipedia, the free encyclopedia
This problem could be overcome by "dubbing" the video; using the VCR to make a copy of the original video as it was played by the camcorder, although this (as with all analog formats) had the drawback of degrading the copied-signal.
Both Hi8 and SVHS were officially rated at a (luminance) resolution of "400 horizontal TV/lines," a vast improvement from their respective base-formats (of 240 TV/lines.) Chroma resolution (for both SVHS and Hi8) remained unchanged, well below 100 TV/lines.
As of 2005, analog video recording is being supplanted by digital video recording.
en.wikipedia.org /wiki/Video8   (1249 words)

  
 Video compression
The first number refers to the luminance or black and white part of the video, and is an expression of the component sampling ratio (not the compression ratio).
Since MPEG2 compressed video relies on data in adjacent frames, if the video is stopped on a particular frame—as would be the case in editing—critical data will be missing.
, or personal video recorders, use a high capacity computer hard disk to record up to about 100 hours of programming.
columbiaisa.50megs.com /camcord_video_compression.htm   (1145 words)

  
 Video Cables, Component Video Cables, S-Video Cables, Composite Video Cables and VGA Monitor Cables
Component video separates the luminance signal from the sub-components of the chrominance signal, i.e., the blue signal and the red signal.
It is useful to remember that RGB video typically describes a computer video signal, while component video relates to a television screen signal.
S-video is also known as Separate Video or Y/C video because the Y signal (brightness) and C signal (color) are separated.
www.cable-connection.com /cablec8.html   (395 words)

  
 Component Video - TimeForDVD.com
Technically speaking, the component video signal is comprised of the luminance (Y) signal and separate chrominance (P
The component video connection allows each signal to pass through its own medium, allowing delivery of a reference-quality picture with the most precise color presentation.
Although the RCA jacks are usually color coded (see picture) as red, green, and blue, component video is not the same as or interchangeable with the RGB connection.
timefordvd.com /ref/ComponentVideo.shtml   (266 words)

  
 2.05: Flying Toasters
The Video Toaster gives the user a four-input switcher, two 24-bit frame buffers, a luminance keyer (the ability to lay live video over computer graphics, a la the TV weatherman), and an internal genlock.
Desktop video people are in corporate communication departments, art agencies, educational markets, even medical and government markets, as well as the traditional video market and the event videographers.
After the Toaster, assuming you are starting from scratch with no decks, no computers, no nothing, the dream costs from $10,000 to $15,000, depending on whom you talk to, what catalogue you use, and where you are willing to compromise.
www.wired.com /wired/archive/2.05/flying.toasters_pr.html   (266 words)

  
 Video Preservation: Glossary of Terms
Luminance indicates the amount of light intensity in a picture which is perceived by the eye as brightness.
The frequent appearance of dropouts on playback is an indication that the tape or recorder is contaminated with debris and/or that the tape binder is deteriorating.
Characterized by jittery movement of the tape in the transport and/or audible squealing of the tape.
palimpsest.stanford.edu /byorg/bavc/bavcterm.html   (1725 words)

  
 Glossary Search Results
S-Video (Super-Video) - A video cabling standard that splits video information into two separate signals: one for brightness (luminance), and the other for color information (chrominance).
Video quality is between VCD and DVD quality, and SVCDs are mainly found in Asia.
S-Video is also supported by many electronic accessories, such as camcorders, computer video cards with TV functions, and even console games such as the Sony PlayStation.
www.geek.com /glossary/glossary_search.cgi?s   (10973 words)

  
 S-Video Cables from Blue Jeans Cable
S-Video delivers better color and resolution than one-wire "composite" video by separating the luminance (brightness) and chrominance (color) elements of the signal, but is inferior to three-wire "component" video in that it doesn't support progressive scan or high-definition.
S-Video is a video signal format which has grown in popularity in recent years and is widely used on satellite receivers, PVRs, DVD players and S-VHS VCRs.
The answer to the problem is simple: at each end of the S-Video run is a breakout adapter, with a mini-DIN at one end and two female BNC connectors at the other.
bluejeanscable.com /store/svideo   (739 words)

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