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3.
CAMERA OVERVIEW
3.1
Colour Separation
RED
INFRARED
INCOMING LIGHT
3 x CCD
R-GB-IR colour line
Figure 3.2.
Alignment of the CCD linear arrays.
3.2
Camera Operation
The CCDs convert incoming light into electrical charge. The amount of charge generated in
each of the individual pixels is directly proportional to the intensity of light they receive. The
resulting charge packets are transferred into two high-speed CCD shift registers and trans-
ferred to the output charge-to-voltage converters of the CCDs. The generated output video is
Correlate Double Sampled (CDS) and amplified by two user accessible gain factors prior to
digitisation into 12 bits.
© TVI Vision, 18 October 2006
XIIMUS R-GB-IR CL User Manual.
The incoming light is separated into three, Infrared, Red
and Bluegreen, colour images by an R-GB-IR beam
splitter (figure 3.1). The spectral distribution of each
colour is standardised and well known. By attaching a
CCD to each of these colour outputs, it is possible to
measure the intensity of each colour image.
BLUEGREEN
Figure 3.1
GB
The R-GB-IR colour separation beam splitter.
The CCDs are aligned to each other to
get the perfect image of the three
measured colour components. All the
three CCDs see exactly the same area
IR
of the target from same viewing angle,
R
distance
and
Corresponding pixels of all the three
sensors are very precisely positioned
optically in the same place (figure 3.2).
This makes the colour analysis simpler
and does not require matching or
synchronising of separate colour lines.
The resolution of the camera is the
same as for the individual CCD array.
Version 1.2
at
the
same
time.
page 8 ( 57 )
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