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SKIING WITH LAMBERT  --  SNOW, ILLUMINATION AND MACHINE VISION  (continued)


5. Application: How to Illuminate Machine Vision
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Knowing some details about visual appearance of snow can be useful to an engineer.
Let us start with a small story, taken from factory floor:


5.1 Story from Factory Floor
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Key words:

tilt | collimated | diffuse | point source | area source | Illumination design | application



Your colleage hands you over some component and describes some unusual feature that he has seen on it.

At first, you don't see that feature.

Now please watch carefully what you normally do without thinking:

(You look at the component from various distances.)

While watching it, you TILT that component in your hands.

If still without success, you move the component to a place where a different type of illumination prevails.
That might comprise
* different color temperature (here not discussed in more detail)
* more COLLIMATED / more DIFFUSE light
* POINT SOURCEs or AREA SOURCEs of light.

If still fruitless, perhaps you ask your colleage to show you that feature.
Maybe, he also doesn't see it any more.
So you both decide to go back to the place where he discovered the feature.
And, bingo, here it is visible.

Why do I tell this story? --
First, and nowadays commonplace: ILLUMINATION DESIGN is extremely important for the success of machine vision.
Second: There is no "ideal" illumination that fits to any APPLICATION. Optimum illumination depends on APPLICATION.

Some examples are shown in the following paragraphs.



Continued: 5.2 Scanning Printed Matters for OCR

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Last modified Feb.12th, 2009