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Digital Camera

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What is Digital Camera?

A digital camera is a camera that stores pictures in electronic memory instead of film. Because of this, a digital camera can hold many more pictures than a traditional film camera. A digital camera can sometimes hold hundreds or thousands of pictures. Many use a memory card to store them. Most digital cameras can use a USB cable that connects into a computer to send pictures that are in the camera to the computer.

Digital photography is a kind of photography where a digital camera is used to take photos. Digital cameras use an image sensor instead of photographic film. Very often, they also use a memory card to store the photos in a digital format. Most photography is digital, though some photographers still use the old film cameras.

The majority of cameras are part of a mobile phone, called a "camera phone". They can send their pictures to other phones and other devices. Most camera phones do not make as good pictures as larger separate cameras do, especially where light is not bright.

Most digital cameras can serve as Video cameras. Some have a direct link to another computer where the data may be stored.

A digital camera stores images digitally rather than recording them on film. The pictures can be downloaded to a computer system.


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History of Digital Camera:-

The history of the digital camera began with Eugene F. Lally of the Jet Propulsion Laboratory, who was thinking about how to use a mosaic photo sensor to capture digital images. His 1961 idea was to take pictures of the planets and stars while travelling through space to give information about the astronauts' position. Unfortunately, as with Texas Instruments employee Willis Adcock's filmless camera in 1972, the technology had yet to catch up with the concept.

Steven Sassoon as an engineer at Eastman Kodak invented and built the first electronic camera using a charge-coupled device image sensor in 1975. Earlier ones used a camera tube; later ones digitized the signal. Early uses were mainly military and scientific; followed by medical and news applications. In the mid to late 1990s digital cameras became common among consumers. By the mid-2000s digital cameras had largely replaced film cameras, and higher-end cell phones had an integrated digital camera. By the beginning of the 2010s, almost all smartphones had an integrated digital camera.


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How Digital Camera work?

Digital cameras look very much like ordinary film cameras but they work in a completely different way. When you press the button to take a photograph with a digital camera, an aperture opens at the front of the camera and light streams in through the lens. So far, it's just the same as a film camera. From this point on, however, everything is different. Instead, there is a piece of electronic equipment that captures the incoming light rays and turns them into electrical signals. This light detector is one of two types, either a charge-coupled device (CCD) or a CMOS image sensor.

In a television or computer screen, electronic equipment switches all these coloured pixels on and off very quickly. Light from the screen travels out to your eyes and your brain is fooled into see a large, moving picture.

In a digital camera, exactly the opposite happens. Light from the thing you are photographing zooms into the camera lens. This incoming "picture" hits the image sensor chip, which breaks it up into millions of pixels. The sensor measures the colour and brightness of each pixel and stores it as a number. Your digital photograph is effectively an enormously long string of numbers describing the exact details of each pixel it contains. You can read more about how an image sensor produces a digital picture in our article on webcams.


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Digital Camera data storage:-

 When you take a picture or a video, it is saved on a memory device. The memory device can be internal flash memory inside the camera, or external - memory cards, micro drives and so on. The most used method for saving pictures and videos from a camera is a SD card.

The picture can be saved in a compressed file (JPEG, TIFF) or in an uncompressed RAW file. The compressed picture is lower quality than the uncompressed, but the uncompressed picture has to be processed in a computer.

A video is usually saved as an AVI, MPEG or MOV file format (depends on the producer of the camera).

Most modern cameras also put Exit information in the picture file. This metadata information usually includes the date of taking the picture, the camera type, and its settings. Some cameras include GPS coordinates.


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