User`s manual

G-11
Glossary
G
Shading correction
The process used to remove uneven gray areas (light level) from an image is called a shading
correction. The figures below illustrate the principle of the shading correction. The new image has
the areas of uneven brightness subtracted from it to produce a corrected image.
Smoothing
See "Space filter."
Space filter
Space filter includes various image manipulation processes that create more readable images by
removing noise and distortion in the image data. And, by extracting or emphasizing certain image
features, it is easier to evaluate or identify target objects by converting the images into standard
patterns. In the IV-C35M, you can select a "smoothing (average, center)," "edge emphasis," "edge
extraction," "horizontal edge," and "vertical edge."
Item Contents
Smoothing
(center)
- Specify the median pixel gray level from the
surrounding3x3area.
- Since noise elements are difficult to select,
they will not affect the output.
- Display smooth images with
decreased noise.
- Used to eliminated surface flaws
and unevenness in the reflected
light caused by protrusions or
dents.
- This type of smoothing (averaging)
is faster than the median
smoothing.
Smoothing
(average)
- Specify the average pixel gray level from the
surrounding3x3area.
- Since noise elements are included in the
average, the noise will affect the output.
Edge
emphasis
- Display images with sharp boundaries between brighter and darker areas.
- Used to stabilize and create a binary outline around unclear objects.
Edge
extraction
- Display images after extracting and clarifying
the boundaries between the brighter and
darker areas.
- Used to measure objects with low
contrast.
Horizontal
edge
- Horizontal edge extraction: Display only the
horizontal boundaries of an object.
Vertical
edge
- Vertical edge extraction: Display only the
vertical boundaries of an object.
÷
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New image Uneven areas of brightness Corrected image