A digital on-screen graphic, digitally originated graphic (DOG, bug,[1]network bug, or screenbug) is a watermark-like station logo that most television broadcasters overlay over a portion of the screen area of their programs to identify the channel. They are thus a form of permanent visual station identification, increasing brand recognition and asserting ownership of the video signal.
In a typical digital on-screen graphic, the station's logo appears in a corner of the screen (in this simulated example, the bottom-right).
The graphic identifies the source of programming, even if it has been time-shifted—that is, recorded to videotape, DVD, or a digital personal video recorder such as TiVo. Many of these technologies allow viewers to skip or omit traditional between-programming station identification; thus the use of a DOG enables the station or network to enforce brand identification even when standard commercials are skipped.
DOG watermarking helps to reduce off-the-air copyright infringement—for example, the distribution of a current series' episodes on DVD: the watermarked content is easily differentiated from "official" DVD releases, and can help identify not only the station from which the broadcast was captured, but usually the actual date of the broadcast as well.[citation needed]
Graphics may be used to identify if the correct subscription is being used for a type of venue. For example, showing Sky Sports within a pub requires a more expensive subscription; a channel authorized under this subscription adds a pint glass graphic to the bottom of the screen for inspectors to see. The graphic changes at certain times, making it harder to counterfeit.
On the other hand, watermarks pollute the picture, distract viewers' attention and may cover an important piece of information presented in the television program. Extremely bright watermarks may cause screen burn-in on some types of TV sets.
Usage of visually perceptible embedded watermarks requires the program author to have a separate clean copy for archival purposes, but this practice was not common decades ago when watermarking became popular among broadcasters. Watermarks present an issue when archival videos are used for a documentary that strives to create a coherent story. In some cases, watermarks are blurred or digitally removed if possible to clean up the picture. In the absence of visually perceptible watermarks content control can be ensured with visually imperceptible digital watermarks.[2]
In some cases, the graphic also shows the name of the current program. Some television networks may place additional logos or text alongside their DOG to advertise significant upcoming programs. For example, broadcasters of the Olympic Games often add the Olympic rings to their DOG for a period of time leading up to—and during—the Games.
Another graphic on television usually connected with sports (particularly in North America, though not in Europe) is the sponsor tag. It shows the logos of certain sponsors, accompanied by some background relevant to the game, the network logo, announcement and music of some kind.
Usage in ham radio and TVedit
In most countries, the ham station is required to periodically identify their amateur-TV transmission. Such stations frequently overlay their callsign on the signal instead of placing a card in the background. Most hams use homebuilt devices or old consumer character generators to generate such identifications rather than using graphical superimposes of high cost to do so. Only rarely one can see real graphics, as the callsign is usually written in the "OSD font".
Live DOGs by hobbyistsedit
One of the easiest and most sought-after devices used to generate DOGs by hobbyists is the 1980s vintage Sony XV-T500 video superimposer. This device can luma-key a signal, capture a still frame into memory and then overlay the keyed graphic in one of eight colors onto any CVBS signal. Another method commonly used by hobbyists and even low-budgeted TV stations in former times was Amiga computers with genlock interfaces.
^Program Supplier Pack | Aurora 3 November 2013 at the Wayback Machine
^Content Control: Digital Watermarking and Fingerprinting 14 November 2014 at the Wayback Machine
External linksedit
Wikimedia Commons has media related to Digital on-screen graphics.
February 15, 2024
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A digital on screen graphic digitally originated graphic DOG bug 1 network bug or screenbug is a watermark like station logo that most television broadcasters overlay over a portion of the screen area of their programs to identify the channel They are thus a form of permanent visual station identification increasing brand recognition and asserting ownership of the video signal In a typical digital on screen graphic the station s logo appears in a corner of the screen in this simulated example the bottom right The graphic identifies the source of programming even if it has been time shifted that is recorded to videotape DVD or a digital personal video recorder such as TiVo Many of these technologies allow viewers to skip or omit traditional between programming station identification thus the use of a DOG enables the station or network to enforce brand identification even when standard commercials are skipped DOG watermarking helps to reduce off the air copyright infringement for example the distribution of a current series episodes on DVD the watermarked content is easily differentiated from official DVD releases and can help identify not only the station from which the broadcast was captured but usually the actual date of the broadcast as well citation needed Graphics may be used to identify if the correct subscription is being used for a type of venue For example showing Sky Sports within a pub requires a more expensive subscription a channel authorized under this subscription adds a pint glass graphic to the bottom of the screen for inspectors to see The graphic changes at certain times making it harder to counterfeit On the other hand watermarks pollute the picture distract viewers attention and may cover an important piece of information presented in the television program Extremely bright watermarks may cause screen burn in on some types of TV sets Usage of visually perceptible embedded watermarks requires the program author to have a separate clean copy for archival purposes but this practice was not common decades ago when watermarking became popular among broadcasters Watermarks present an issue when archival videos are used for a documentary that strives to create a coherent story In some cases watermarks are blurred or digitally removed if possible to clean up the picture In the absence of visually perceptible watermarks content control can be ensured with visually imperceptible digital watermarks 2 In some cases the graphic also shows the name of the current program Some television networks may place additional logos or text alongside their DOG to advertise significant upcoming programs For example broadcasters of the Olympic Games often add the Olympic rings to their DOG for a period of time leading up to and during the Games Contents 1 Usage 2 Connections with sponsor tags 3 Usage in ham radio and TV 4 Live DOGs by hobbyists 5 See also 6 References 7 External linksUsage editMain article Digital on screen graphic by countryConnections with sponsor tags editAnother graphic on television usually connected with sports particularly in North America though not in Europe is the sponsor tag It shows the logos of certain sponsors accompanied by some background relevant to the game the network logo announcement and music of some kind Usage in ham radio and TV editIn most countries the ham station is required to periodically identify their amateur TV transmission Such stations frequently overlay their callsign on the signal instead of placing a card in the background Most hams use homebuilt devices or old consumer character generators to generate such identifications rather than using graphical superimposes of high cost to do so Only rarely one can see real graphics as the callsign is usually written in the OSD font Live DOGs by hobbyists editOne of the easiest and most sought after devices used to generate DOGs by hobbyists is the 1980s vintage Sony XV T500 video superimposer This device can luma key a signal capture a still frame into memory and then overlay the keyed graphic in one of eight colors onto any CVBS signal Another method commonly used by hobbyists and even low budgeted TV stations in former times was Amiga computers with genlock interfaces See also editBroadcast designer Screen burn in a side effect in some cases of digital on screen graphics On screen display Television news screen layout Digital watermark Score bug an on screen graphic specifically for sport broadcasts Clock identReferences edit Program Supplier Pack Aurora Archived 3 November 2013 at the Wayback Machine Content Control Digital Watermarking and Fingerprinting Archived 14 November 2014 at the Wayback MachineExternal links edit nbsp Wikimedia Commons has media related to Digital on screen graphics Retrieved from https en wikipedia org w index php title Digital on screen graphic amp oldid 1189216137, wikipedia, wiki, book, books, library,
