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"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.
