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topic 3 + 4
topic 4
4.3
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Libby Code
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Cards (6)
photo
storage;
brain
- The brain
receives
and
sends
signals as
electrical
impulses
camera
- films rely on
chemicals
to store
information.
Over time these
chemicals
can react & change, so the
image
may also
change
digital
-
numbers
digital
imaging -
process
of
creating
an
image
using a
computer
pixels
- Short for
Picture
element
;
individual
element
of a digital image
each
is assigned
coordinates
each is
assigned
a
value
(
colour
)
these
numbers
are stored on
computers
resolution
-
number
of
pixels
per unit
area
of a
Digital
image
more
pixels =
better
quality
CCD
-
charged coupled device
grid
similar to
graph paper
, when
light
falls on a
square
it creates
electricity
, the image is
converted
to
numbers
after this, it can be
stored
Satellites
have
cameras
which capture
images
, turn them into
digital information
and
beam
that information to
computers
here on
earth