what is progressive scan in TV and what are the advantages of it?
446356
Progressive scan allows for a better quality picture when viewing media from a source that support it as well.\n\nfor example, if you DVD player support progressive scan, your TV must also support it inorder to use the function.
1169448
it is because of the difference in resolution.\ntypically, a television monitor is set at 270 X 480 lines. at 6 feet the pixels are a little blurry making the picture clear. If you looked at it from 2 feet away, it wold be real grainy.\nthe computer monitor has a much higher resolution, 800x600 and up, there for the higher resolution is seen clear close up. If you use a tv monitor for your computer monitor at 6 feet away, it sould be very clear.\nHope that explains it
925069
Conserves energy, supports very high resolutions, portable, sexy.\n\nNote: Viewing angle is still a trouble..... you don't have that problem in CRT monitors. The picture becomes negetive & colour changes when we increase the viewing angle of a TFT screen.
815501
A CRT(cathode ray tube) display screen uses a "electron gun" to fire electrons at the phosphor screen, thus creating an image. The advantages to having a CRT screen over a LCD(liquid crystal display) screen is that it's easier to install, since almost all computers and its motherboards have the port integrated.\nThe disadvantages of a CRT screen, is that it's bulky(due to the size of the "electron gun"), and it produces radiation, which is received by your eyes when viewing the screen. Prolonged exposure to the radiation can cause discomfort(in terms of headaches and/or seizures).
771187
CCTV is simply normal TV without a broadcase.  The camera puts out a video signal that's the same video signal that your TV displays.  The only difference is that there's no conversion to RF and back as there is with standard broadcast TV.\n\nI suggest that rather than waiting for someone to do your research for you, you should get off your metaphorical butt and start doing the work:\nhttp://en.wikipedia.org/wiki/Closed-circuit_television\nhttp://electronics.howstuffworks.com/tv.htm
326112
20 inch flatscreen wide is best.\n\n-J
1060050
The TV research companies select a determined amount of homes, and then ask those families if they are interested in participating in a study Those interested then agree to the installation to their TVs or cable boxes of a device called a "meter". The meter then keeps track of every program viewed based on channel and time of day and the amount of time that that particular channel was tuned. It is very, very accurate. However, the downside of the meter is it can register which channel is tuned, but is in no way able to know how many people are watching, and their gender and age. Also, it is not able to tell when the TV is just on and no one is in that room watching it (like my kids do).\n\nBefore the meter, there was a very simple system called the  "diary". The families that agreed to participate were given a booklet with its pages divided in days and hour frames. In it the families manually entered the channel and program watched, how long they watched it and how many people watched it. Although it sounds more thorough than the meter, it really wasn't because some people could forget to fill out the diary the moment they watched TV, and then just before returning it, they would fill it all out of memory. \n\nHope I was of help, my friend.
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Its progressive jpg file.\n\nA simple or "baseline" JPEG file is stored as one top-to-bottom scan of the image.  Progressive JPEG divides the file into a series of scans.  The first scan shows the image at the equivalent of a very low quality setting, and\ntherefore it takes very little space.  Following scans gradually improve the quality.  Each scan adds to the data already provided, so that the total storage requirement is roughly the same as for a baseline JPEG image of the\nsame quality as the final scan.  (Basically, progressive JPEG is just a rearrangement of the same data into a more complicated order.)\n\nThe advantage of progressive JPEG is that if an image is being viewed on-the-fly as it is transmitted, one can see an approximation to the whole image very quickly, with gradual improvement of quality as one waits longer; this is much nicer than a slow top-to-bottom display of the image.  The disadvantage is that each scan takes about the same amount of computation to display as a whole baseline JPEG file would.  So progressive JPEG only makes sense if one has a decoder that's fast compared to the communication link. (If the data arrives quickly, a progressive-JPEG decoder can adapt by skipping some display passes.  Hence, those of you fortunate enough to have T1 or faster net links may not see any difference between progressive and\nregular JPEG; but on a modem-speed link, progressive JPEG is great.)
309685
A common garden variety TV screen is a Cathode Ray Tube- the screen itself is a phosphor coated glass surface attached to the vacuum bottle and electron gun assembly that makes up the rest of it. In operation the electrons from the gun at the rear of the thing are electromagnetically accelerated to the phosphor screen, and scanned by electromagnetic deflection back and forth over the phosphor, making little dots of light that cumulatively make the "picture"- each dot is a "picture element" or pixel the whole accumulation makes a recognizable image. and if you like I can explain how the thing work in color, too.
358985
you can get a scanner (dont think there expensive)
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Plasma technology differs from other display systems in as much as here in each pixel a source of light is produced. Between the flat glass panels loaded electrodes cause tiny explosions of xenon gas, which cause an ultraviolet light radiation, which for its part produces red, green and blue phosphorus light at the screen back. \n\nContrary to the conventional cathode ray tubes, with which a picture is divided into a rapid succession by pixels on the screen, all plasma display pixels become at the same time "illuminate". Therefore the plasma picture develops spontaneously and is extremely sharp. It extends evenly into all corners of the screen - whole without distortion or flares.\n\nAstonishing colors\n\nThe plasma technology ensures a brilliant, sharp image quality of unbelievable clarity by 256 gray tones and altogether 16.7 million colors.\n\nPrecise image quality\n\nOwing to the fact that in the case of the plasma display brightness, color and contrast of each individual screen pixel are stopped, it does not develop brightness differences between the center of the screen and the boundary regions. In addition the square pixels provide for an absolutely precise image replication, freely from the distortions which one at the edges of cathode ray tubes you have to consider with.\n\n160-Grad viewing angle \n\nFlat plasma panels offer opposite shining crystal displays (LCD) and screens with rear-projection a substantial advantage, if as the phosphorus-coated screen surface and the picture is stimulated directly is not projected on it.\n\nTherefore the plasma technology can obtain an unusually broad viewing angle - both in vertical and in horizontal direction. This makes a clearer view for a larger spectator number possible on the screen.\n\nNo magnetic disturbances \n\nDifferently than cathode ray tubes plasma displays do not shoot electrons at the screen and therefore also by the proximity of magnetic fields are not disturbed. That means that plasma panels can be set up problem-free in the proximity of loudspeakers or other strong magnetic sources, without thereby picture distortions or disturbances in the color equilibrium are caused.\n\nMultimedia flexibility\n\nPlasma displays support variety of sceen sizes and work both with Pal and with NTSC video format. Many plasma support additionally also SECAM and HDTV. All displays support multimedia-applications and offer a RS232-Terminal, so that the user can switch problem-free between input signals from different sources. Multi lnput terminals permit even the announcement of divided pictures* on only one plasma display.
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There really isn't software to make a picture sharper. When you see these TV shows that take a outdoor camera photo and turn it into someones face 100 yards away it's not real. If the resolution is not in the photo it can't be enhanced really well. That's why when the news show pictures of convenience store robberies they are blurry.
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They Check your blood pressure, examine you.  Just like on TV. It is no problem.
745456
Don't listen to the radiation crap, they don't put out nearly enough to really harm you.  LCDs are better, they produce less eye strain because they do not blink like CRTs.  Also, the image quality on new LCDs is excellent.
873772
It depends on what you class as a television. There were monitors around before the camera such as wave form and vectorscope monitors so that engineers could see visual images of electronic activity within an electronic system such as radio. They used these when researching how to capture moving images i.e. the TV camera, we still use them for monitoring the technical quality of the pictures we produce. But in terms of what the general public knows as a TV monitor it was developed concurrently with the camera. The picture was captured on a tube converted into signal sent down a cable and then reproduced on the tube in the TV.\nI've just had this debate with one of our technical directors our news director and some other staff and the majority say the monitor or TV in it's crudest form came before the camera.\nHope this helps.
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It is based primarily on historical capabilities and modern compatibility.  From Wikipedia:\n\nModulation\nGiven all of these parameters, the result is a mostly-continuous analogue signal which can be modulated onto a radio-frequency carrier and transmitted through an antenna. All analogue television systems use vestigial sideband modulation, a form of amplitude modulation in which the lower sideband is incompletely suppressed. This provides a small guard band between the actual video carrier and the bottom frequency in the channel, which helps to reduce interference between transmitters on adjoining channels at a receiver which receives strong signals from both. At the time television was developed, the vestigial sideband was easier to accomplish than true single-sideband modulation; with today's technology, there is no reason for it except to be compatible with existing technology.\n\n\n[edit] Audio\nIn analogue television, the sound portion of a broadcast is invariably modulated separately from the video. Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, but in some cases separate aural and visual antennas can be used. In almost all cases, standard wideband frequency modulation is used for the standard monaural audio; the exception is systems used by France, which are AM. Stereo, or more generally multi-channel, audio is encoded using a number of schemes which (except in the French systems) are independent of the video system. The principal systems are NICAM, which uses a digital audio encoding; double-FM (known under a variety of names, notably Zweikanalton, A2 Stereo, West German Stereo, German Stereo or IGR Stereo), in which case each audio channel is separately modulated in FM and added to the broadcast signal; and BTSC (also known as MTS), which multiplexes additional audio channels on the existing FM audio carrier. All three systems are compatible with monaural FM audio, but only NICAM may be used with the French AM audio systems.\n\nj
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A CAT scan is very similar to an x-ray as it still uses x-rays. However, The x-rays are 'collated' (that is they are focused through a very small section of the body (think of looking through a tube)). One exposure takes the volume x-rayed and allocates it value that corresponds basically to the attenuation (amount of x-ray energy absorbed) by the skin, fat, tissue, bone, tissue, fat, skin sequence the x-ray travels through. The CAT machine then moves the tube sideways and takes another shot. The tube is also rotated and further exposures taken (Actually there are banks of 'tubes'). Advanced computation is then used to work out the density of each small volume, which can be mapped visually to represent the type of tissue and an internal picture of the body generated.\n\nMRI uses magnetic fields to align the atoms in the body, a radio frequency pulse (that causes hydrogen atoms to resonate) is targeted at the area of interest. This causes the Hydrogen atoms to spin at a particular frequency.\n\nWhen the radio pulse is turned off, the Hydrogen atoms change their spin and emit a frequency that is specific to the tissue the atoms were in. The energy is picked up by coils and again can be used to generate a visual interpretation of the body.