Pixelization

Source: Wikipedia, the free encyclopedia.
This article is about the graphical editing/censorship technique. For the undesirable phenomenon in which individual pixels are visible, see Pixelation. For the stop motion animation technique, see Pixilation.

Pixelization (British English, pixelisation) or mosaic processing is any technique used in editing images or video, whereby an image is blurred by displaying part or all of it at a markedly lower resolution. It is primarily used for censorship. The effect is a standard graphics filter, available in all but the most basic bitmap graphics editors.

As censorship

A familiar example of pixelization can be found in a majority of television news and documentary productions, in which vehicle

COPS
. Graphic injuries and excess blood may also be pixelized. Offense words that are visually visible may also be pixelized.

Pixelization may also be used to avoid unintentional

time stamps on home video submissions. Censorship for such purposes is most common on reality television series.[citation needed
]

  • Pixelization was used to anonymize this photograph.
    Pixelization was used to anonymize this photograph.
  • Marshall B. Webb, an American general, sits in the White House Situation Room during Operation Neptune Spear. A classified document on the desk in front of him was pixelized by the government of the United States before the photo was released.
    Operation Neptune Spear
    . A classified document on the desk in front of him was pixelized by the government of the United States before the photo was released.
  • Wall poem in Amsterdam. The image was self-censored by the artist, Rombout Oomen, in 2004 (pixelization of the pubic hair).
    Wall poem in Amsterdam. The image was self-censored by the artist, Rombout Oomen, in 2004 (pixelization of the pubic hair).
  • Part of this image, a mural at the entrance to the offices of The Pokémon Company in Tokyo, has been pixelized for copyright reasons.
    Part of this image, a mural at the entrance to the offices of The Pokémon Company in Tokyo, has been pixelized for copyright reasons.

In media

Pixelization has also been used for artistic effect, notably in the art print The Wave of the Future, a reinterpretation of

wireframe model computer graphics image.[1][2] Westworld (1973) was the first feature film to use digital image processing
to pixelize photography to simulate an android's point of view.

The 2010 third-person cover shooter Kane & Lynch 2: Dog Days also used pixelization for artistic purposes, as nudity and headshots are pixelated in the game, to make the game appear more like user-generated content.

Alternative techniques

Umm Er-Rasas in Jordan have been rearranged by aniconists
.

A black rectangular or square box (known as censor bars) may be used to occlude parts of images completely (for example, a black bar covering the eyes instead of the entire face being pixelized). Censor bars were extensively used as a graphic device in the January 2012 protests against SOPA and PIPA.

A drawback of pixelization is that any differences between the large pixels can be exploited in moving images to reconstruct the original, unpixelized image;[3] squinting at a pixelized, moving image can sometimes achieve a similar result. In both cases, integration of the large pixels over time allows smaller, more accurate pixels to be constructed in a still image result. Completely obscuring the censored area with pixels of a constant color or pixels of random colors escapes this drawback but can be more aesthetically jarring.

An additional drawback, when pixelization is used to reduce the repulsing, disturbing or, more generally shocking, aspect of an image, is that all information contained in the pixelized area is lost for the audience.[4] Other visual processing techniques can help reduce the shocking aspect of images or videos while preserving most of the information of the media.[4][5]

International legal standards

Nudity is obscured on broadcast television stations in the United States. The Federal Communications Commission states it is a violation of federal law to air obscene, indecent, and profane programming at any time, especially during certain hours. Monetary penalties and revocation of licenses are issued for law breakers.[6] Japanese pornography laws require that genitals in films (including animated works) and other forms of adult media (such as eroge, drawings, etc) be obscured. Article 175 of Penal Code (Act No.45 of 1907) still in effect today in Japan forbids any person and imprisons anyone who distributes, sells or displays in public an obscene document, drawing or other objects of such nature.[7] In Thailand, restrictions are placed on television broadcast depiction of cigarettes being smoked,[8] alcohol being consumed, or guns being pointed at people. Pixelization is one method of censoring this content.

See also

References

  1. ^ vorpal.us: "Wave of the Future is now the Past". Retrieved July 13, 2009
  2. ^ vorpal.us: "High resolution image of 'Wave of the Future'". Retrieved July 14, 2009
  3. S2CID 1813467
    .
  4. ^
    ISSN 0167-7055
    .
  5. S2CID 51928057
    .
  6. ^ "Obscenity, Indecency and Profanity". Federal Communications Commission. 2010-11-18. Retrieved 2020-09-17.
  7. ^ "PENAL CODE (Act No.45 of 1907)" (PDF). Article 175
  8. ^ 2Bangkok.com: "Smoking on Thai TV" Archived 2010-07-25 at the Wayback Machine Retrieved February 15, 2007

External links

Wikimedia Commons has media related to Pixelization.
Look up pixelization or pixelisation in Wiktionary, the free dictionary.
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