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6. Functions and Operations
6.1. Principle of operation
A line scan camera works according to the same principle as a fax machine, also sometimes
referred to as a “push broom” operation.
It captures a single line at a time (horizontal), and requires either the object or the camera to
be moving to create the vertical direction of the image.
Area
Fig. 8. The principle of line scan.
A 3CCD line scan camera follows the exact same principle, with the added complexity of three
CCD sensors mounted on a dichroic prism. The three CCD sensors are aligned on the prism in
such as way, that they all view the same part of the object. This is referred to as co-site
sampling. Figure 4 shows the construction of the prism, and how the CCDs are aligned.
I
R
-cut
Green
pixel
n of
Red
p
ixel
Blue
p
ixel
Fig. 9. 3 CCD prism construction.
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