How Digital Cameras Work?
The basic working of the Digital camera and Film camera is one
and the same. Both use the shutter, lens and aperture. The Lens
captures the light and then it passes it into the aperture,
which controls the light and the shutter opens and closes to
control the duration of light, which enters.
The major difference is the technology of capturing the image.
Digital camera does not use film to store the image. In digital
camera an image sensor is used to capture the image. It is a
computer silicon chip. On the surface of this chip there are
millions of pixels, which are photosensitive diodes.
The shutter button of the digital camera activates a metering
cell, which manages the shutter speed and aperture according to
the amount of light coming through the lens. When a person
clicks on the camera shutter each and every pixel of the image
sensor stores the intensity of the light, which falls on it by
gathering an electrical charge. When strong light hits a pixel,
it generates high charge and weak light generates low charge.
After the shutter closes charges from every pixel is converted
into digital numbers. This series of numbers creates an image on
a computer screen.