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Working principle of a digital camera:

· Capturing image: lenses focused the light rays come from the object made into a coherent image. Diaphragm determines amount of light to be entered and shutter speed determines time of exposure. Then lights made fall onto sensor (CCD) to get corresponding electric charge.

· Binary system processing: Where there is word digital, the word binary also found there. To convert analogue signal (electric charge from photosites) to Digital signal in binary form a ADC converter is used. Each of the charge stored in photosites assigns to a binary value, storing them as pixels. A pixel is a point sample of an image which contains three basic color (RGB) components. Pixel per square inches determines the resolution of the camera, which indicates the size and quality of image. In next post I'll discuss more about pixel and resolution.

· Compression and storage: Once the image is digitalized, it is compressed by a microprocessor and stores as image file (JPEG, TTF etc.)

From the age of invention of camera, evolution of this has been taken place and which will continue. Now digital cameras are being developed by adding new features like video recording, music playing, even GPS has embedded in it.

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