Surveilance Camera Wallpaper 2560X1600

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A camera is a device that records and stores images. These images may be still photographs or moving images such as videos or movies. The term camera comes from the word camera obscura (Latin for "dark chamber"), an early mechanism for projecting images. The modern camera evolved from the camera obscura.

Cameras may work with the light of the visible spectrum or with other portions of the electromagnetic spectrum. A camera generally consists of an enclosed hollow with an opening (aperture) at one end for light to enter, and a recording or viewing surface for capturing the light at the other end. A majority of cameras have a lens positioned in front of the camera's opening to gather the incoming light and focus all or part of the image on the recording surface. The diameter of the aperture is often controlled by a diaphragm mechanism, but some cameras have a fixed-size aperture. Most cameras use an electronic image sensor to store photographs on Flash memory. Other cameras including the majority from the 20th century use photographic film.

The still camera takes one photo each time the user presses the shutter button. A typical movie camera continuously takes 24 film frames per second as long as the user holds down the shutter button, or until the shutter button is pressed a second time.

The forerunner to the photographic camera was the camera obscura.^[1] In the fifth century B.C., the Chinese philosopher Mo Ti noted that a pinhole can form an inverted and focused image, when light passes through the hole and into a dark area.^[2] Mo Ti is the first recorded person to have exploited this phenomenon to trace the inverted image to create a picture.^[3] Writing in the fourth century B.C., Aristotle also mentioned this principle.^[4] He described observing a partial solar eclipse in 330 B.C. by seeing the image of the Sun projected through the small spaces between the leaves of a tree.^[5] In the tenth century, the Arabic scholar Ibn al-Haytham (Alhazen) also wrote about observing a solar eclipse through a pinhole,^[6] and he described how a sharper image could be produced by making the opening of the pinhole smaller.^[5] English philosopher Roger Bacon wrote about these optical principles in his 1267 treatise Perspectiva.^[5] By the fifteenth century, artists and scientists were using this phenomenon to make observations. Originally, an observer had to enter an actual room, in a which a pinhole was made on one wall. On the opposite wall, the observer would view the inverted image of the outside.^[7] The name camera obscura, Latin for "dark room", derives from this early implementation of the optical phenomenon.^[8]

The actual name of camera obscura was applied by mathematician and astronomer Johannes Kepler in his Ad Vitellionem paralipomena of 1604. He later added a lens and made the apparatus transportable, in the form of a tent.^[9][10] British scientist Robert Boyle and his assistant Robert Hooke developed a portable camera obscura in the 1660s.^[11]

The first camera obscura that was small enough for practical use as a portable drawing aid was built by Johann Zahn in 1685.^[12] At that time there was no way to preserve the images produced by such cameras except by manually tracing them. However, it had long been known that various substances were bleached or darkened or otherwise changed by exposure to light. Seeing the magical miniature pictures that light temporarily "painted" on the screen of a small camera obscura inspired several experimenters to search for some way of automatically making highly detailed permanent copies of them by means of some such substance.

Early photographic cameras were usually in the form of a pair of nested boxes, the end of one carrying the lens and the end of the other carrying a removable ground glass focusing screen. By sliding them closer together or farther apart, objects at various distances could be brought to the sharpest focus as desired. After a satisfactory image had been focused on the screen, the lens was covered and the screen was replaced with the light-sensitive material. The lens was then uncovered and the exposure continued for the required time, which for early experimental materials could be several hours or even days. The first permanent photograph of a camera image was made in 1826 by Joseph Nicéphore Niépce using a sliding wooden box camera made by Charles and Vincent Chevalier in Paris.^[13]

Source: Wikipedia