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Ë
Pre-processing
Pre-processing 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 fea-
tures, it is easier to evaluate or identify target objects by converting the images into standard patterns.
In the IV-S20, you can select from "smoothing," "edge emphasis," and "edge extraction (whole, horizon-
tal, vertical)" pre-processing techniques
Item
Smoothing
Edge
emphasis
Edge
extraction
- See page 9-9 for descriptions about example for image.
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Progressive scan
- See "Full pixel reading."
[R]
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Random shutter function
This function allows the CCD camera shutter operation to be triggered when even an object to be mea-
sured reaches a specified position in the camera's field of view.
In order to make a partial reading of the CCD image at high speed, the IV-S20 is equipped with the
detection function described above with the works just like a proximity sensor to trigger the CCD. A
proximate sensor can also be connected to the system.
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Resolution
The CCD in the IV-S20 contains 512 pixels horizontally and 480 pixels vertically. If it takes a full picture,
the resolution will be X/512 and Y/480.
[S]
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Search area
A portion of the target image to be compared with the reference image, using the gray scale search
function.
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Search pixel
The relationship between detection precision and search speed, and also between pixel contraction
(reduce the number of pixels in the image that must be searched) and search speed, is shown below:
- DETECT ACCURANCY: High speed + [STANDARD-HIGH] _ Low speed
(dectection precision)
- CONTR. PIXEL:
(pixel contraction)
- Display smooth images decreasing the noise.
- Use to eliminated surface flaws and unevenness in the reflected light
caused by protrusions or dents.
- Display images with sharp boundaries between brighter and darker areas.
- Used to stabilize and create a binary outline of obscure objects.
- Display images after extracting and clarifying the boundaries between the
brighter and darker areas.
- Used to measure objects with low contrast.
- Horizontal edge extraction: Display only the with horizontal boundaries o
an object.
- Vertical edge extraction: Display only the vertical boundaries of an object.
High speed + [3 - 2 - 1] _ Low speed
Contents
(standard) (high precision)
Search speed
G-9
Glossary
G
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