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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.
New image
Uneven areas of brightness
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
- Specify the median pixel gray level from the
Smoothing
surrounding 3 x 3 area.
(center)
- Since noise elements are difficult to select,
they will not affect the output.
- Specify the average pixel gray level from the
Smoothing
surrounding 3 x 3 area.
(average)
- Since noise elements are included in the
average, the noise will affect the output.
Edge
- Display images with sharp boundaries between brighter and darker areas.
emphasis
- Used to stabilize and create a binary outline around unclear objects.
- Display images after extracting and clarifying
Edge
the boundaries between the brighter and
extraction
darker areas.
Horizontal
- Horizontal edge extraction: Display only the
edge
horizontal boundaries of an object.
Vertical
- Vertical edge extraction: Display only the
edge
vertical boundaries of an object.
Corrected image
Contents
- 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.
- Used to measure objects with low
contrast.
G-11
Glossary
G
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