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Expansion
Delete
contraction.
Contraction
Delete isolated white points by contraction and then restore the original image size by expan-
sion.
[F]
Fillet width (shading width)
Size of a hollow rectangle which closely matches to the target object in a binary image (white part).
Horizontal direction: Length of a side parallel to the X axis. Vertical direction: Length of a side
parallel to the Y axis.
Fillet width (horizontal)
Flat width
See "Edge detection."
Full pixel reading (progressive scan)
A system which reads all of pixels of image information from the CCD element one after another is
referred to as "full pixel reading system." This system provides the same high resolution for moving
objects as it does for static objects.
On the other hand, conventional CCDs using the NTSC scanning technique must read an object two
times. First the odd lines are read and then the even lines. Therefore, NTSC system produces blurry
images of moving objects. In order to solve this problem, the NTSC system can read only the odd
lines. The disadvantage is that only half the resolution is available.
Conventional NTSC system
Odd line
contraction
e isolated black points by expansion and then restore the original image size by
expansion
Odd line
Even line
CCD
Even line
Image signal
Full pixel reading system
Full lines
G-5
Glossary
G
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