Television picturesAdvanced Photoshop Pictures Contest - 22 image entries
Contest Directions: 
Sony became the latest major electronics manufacturer to drop its production of rear-projection TVs, and focus on liquid crystal display (LCD) TVs and organic light-emitting diode (OLED) TVs. The sales or rear-projection TVs are dropping so fast that it became a losing business unit for Sony and some other TV manufacturers. The sales of classic CRT (cathode-ray tube) TVs are also dropping fast in favor of LCD and plasma TVs, and analysts predict that CRT TVs may completely disappear from US and American shop shelves in the next 24 months. The same thing happened with VCRs when DVD players took over years ago.
To pay a tribute to good old CRT (cathode-ray tube) TV technology which started TV era, photoshop CRT (cathode-ray tube) type of TVs any way you wish. Some examples are: showing alternative uses for CRT TVs, including them in paintings, merging them with other objects or even modern TVs.
[ browse best gallery pictures ] Tags: television
Jackpot: 1st place: $5, 2nd place: $3 , 3rd place: $2
Started: 12/27/2007 6:00:00 AM, Ended: 12/29/2007 6:00:00 AM
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| This contest is fueled by the following news: |
| | Television is a communication system for broadcasting and reception of
moving pictures and sound from a distance. Television is based on the
principle of sequential broadcasting of picture elements with the help
of scanning. Frequency of picture change is selected, mainly, by
criterion of smooth broadcasting of motion. Interlace scanning is used
to reduce the transmission frequency bandwidth. It allows in
increasing the picture frequency by two times (that means, reduce the
flickering of screen) without changing the resolution of frame.
In general view, television channel includes the following devices:
1. Video camera: Lens projects the image on a photosensitive
surface. Along the lines, scanning circuit senses the
brightness of elements of the image. First, odd lines (field
1) are transmitted and then the even (field 2) are
transmitted. Information about the color is transmitted on sub
carrier frequency. Thus, picture of full color television
signal is formed. Specialized document-cameras are
used to shoot and transfer the documents.
2. Video recorder (not compulsory): Records and reproduces
alternation of lines and fields at required moment.
3. Transmitter: Radio frequency signal is modulated by television
signal and broadcasted (translation along the cable is
possible). Sound is transmitted on separate frequency usually
by means of frequency modulation.
4. Receiver: Television. With the help of sync pulses, television
picture is developed on the screen (CRT, LC panel, plasma
panel) in exact order of succession of image lines.
Distribution of video programs on cassettes and compact discs (even
though it is not considered as telecasting) is widely used.
It is accepted to name set of picture details, picture or field change
frequency and occurrence of interlacing as television broadcasting
standard. Three standards with interlace scanning (interlacing) exist
in world since several decades:
* 625 lines, 50 fields per second in Europe (PAL)
* 525 lines, 59.94 fields per second in America and Japan (NTSC)
* 625 lines, 50 fields per second in France, Russia, China and several
countries of Near East (SECAM)
Now, high definition TV is about to replace the existing standards.
History:
TV technologies have not been invented by single person and in a
single shot. Television is based on the invention of
photo-conductivity of selenium, made by Willoughby Smith in 1873.
Invention of scanning disk by Paul Nipkow in 1884 served as impetus in
the development of mechanical TV, which was popularly used right till
1930.
Till date, place of invention of electronic television system is
disputed. Different versions interpret about Germany and also about
the Great Britain, and the boldly, even Hungary and Uzbekistan claims
to be inventors. Russian historians claim that the TV was invented in
Russia, in St. Petersburg by professor B. L. Rozing, who in 1907,
presented the first trial electronic system of TV. However, subsequent
development and commercial introduction was done in USA thanks to
V. K. Zvorykin, a student of B. L. Rozing.
Color TV was invented by O. A. Adamyan
In second half of XX century, TV got widely popular. Its role in the
world was emphasized by UNO by declaring commemorative day - World TV
Day. |
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