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9-10 Existence inspection by point measurement
The presence or absence of target objects is examined.
· A simple black or white evaluation is made in the specified pixel area of binary
Purpose
images.
· The light level in the specified pixel area is averaged, and a decision is made
whether or not it is within the specified lightness range in gray scale images.
Checking the presence or absence of packed parts, inspecting the working
condition of LEDs or fluorescent character display tubes, and sorting household
Applications
electric appliances
[Inspection at 6 points]
Example
· Inspection sequence
Image capture
Binary image
conversion
Average light
9-107
Existence inspection by point measurement
Number of points (max.)
: 128 points at average light levels
256 points in binary images
Point size: 2 m x 2n pixels
(m, n = 1 to 16)
Black/white evaluation
of points
Light level evaluation
level
of points
9
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