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Projekt na anglinu

1. března 2012 v 17:33 | Simon |  :P - Škola
Mali sme za úlohu spraviť projekt na tému prístroja ktorý nás zasiahol. Vybrala som si video kapmeru. Možno to niekoho z vás inšpiruje. Dosť som sa s tým nadrela, takže by to malo byť dole, ak si ale niečo všimnete tak dajte vedieť :) Je to okolo 430 slov :) Pac a pusu Simon

History of video-camera


Nowadays we have video camera almost everywere. Whether they are tiny lenses video cameras on mobile phone, web cameras on our laptops, industrial cameras guarding our security and privacy, digital or analog cameras, trick cameras used in the film industry, scientific cameras adapted for example to record very fast processes/movements, cameras capable of recording at night, the cameras recording the heat (infrared) or cameras with very high, resolution and zoom, with the results of their work to meet virtually all the time.
Their use is also an almost unlimited: from the survey sites dangerous to humans through the use of film to guard shops and businesses.
The basic design of the camera consists of two parts: a scanning and recording parts. The sensor is CCD (1 or 3) chip, lens, controls for zoom, focus, iris etc. and storage section to store the captured video and audio to any media: tape, disk or hard disk memory or flash memory.


The emergence of video-camera was not a matter for the individual. Video-camera, as we know it today emerged gradually from about the 15th century and its origin preceded by three subsidiary inventions: mastery of electricity, advances in optics and the invention of photography.
The first break came in 1881 when Thomas Edison built the first power plant. A decisive step forward in the last two lines of business happend almost at the same time.
In 1824 an English scholar Peter Mark Roget published his work "Persistence of Vision with regard to Moving Objects" in which he explains the imperfection of human sight, and its base: so called resonance of sight. This is reflected the way that even a tenth of a second after the object is no longer in the field of an eye our brain still remembers how the object had looked like. So if we rotate still images in a certain frequency, they will seem to us like a moving film.
Roget discovery did not remain unnoticed and soon after that the first mechanical toys appeared that fascinated the general public, and also scientists.
The design was simple. On a strip of paper or parchment progressive stages of movement (eg, galloping horse) were painted. This strip was pasted on the wall of the drum with the light source in the middle.
Spinning the drum at the moderate speed the phases of given movements started to merge. Being lit from behind it clearly showed the "story" of one movement, jump or step of a character on the belt.
In 1839 the French Academy of Sciences demonstrated the first photo.


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