21 Aug 2013
Digital camera
21 Aug 2013
Tags:
how
Sorry for posting so late, actually I was busy
in developing the blog and learning new codes, but I hope that this post would
make you happy and help you to forgive me.
The Digital Camera
+pomi.jpg)
The word “photography” comes from Greek words which,
combined, mean “to draw with
light” (from photos, or “light,” and graphis, or “drawing”).
Photography is the technique of
recording fixed images on a light-sensitive surface. Digital
cameras are based on the
principles of traditional photography, but, instead of
fixing images on film coated with chemical
substances sensitive to light, they process the intensity of
the light and store the data in digital
files. Modern digital cameras generally have multiple
functions and are able to record sound and
video in addition to photographs.
The Digital System
The Sensor that
Replaces Film
The CCD
(charge-coupled device) is a group of small diodes sensitive to light
(photosites),
which convert photons (light) into electrons (electric charges).
Binary system
processing
To convert
the electric charges of the
photosite
(analog) to digital signals, the
camera uses a
converter (ADC), which
assigns a
binary value to each one of the
charges
stored in the photosite, storing
them as
pixels (points of color).
ADDITIVE MIXTURE
Each pixel is
colored by mixing values of RGB.
Varying
quantities of each of these colors can
reproduce
almost any color of the visible
spectrum.
The value of
each can vary from 0 (darkness)
to 255 (the
greatest color intensity).
Resolution
is measured
in PPIs, or pixels per square inch—
the number of
pixels that can be captured by a
digital
camera. This figure indicates the size and
quality of
the image.
Compression and Storage
Once the
image is digitized, a
microprocessor
compresses the data in
memory as JPG
or TIFF files.
Even mobiles are serving a good place in capturing images and videos, but still digital cameras are only option if your pretty serious in capturing pictures and their quality.
according to a survey during in 2006, it was found that 110 million number of digital cameras sold worldwide.
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