9·45
Degree of match inspection
9
Search area used to
establish the position
New image to
be checked
Search area used to
establish the position
New image to
be checked
▲
Good label
SERIAL NO.
8F053G26
MODEL
IV-S20
SERIAL NO.
8F053G26
MODEL
IV
-
S20
▲
NG label
Purpose
Applica-
tions
Example
The comparison requires the use of the gray scale search function for measuring
the new image against the reference image. By identifying the differences between
images, decisions can be made about the new image being tested.
(The acceptance of the workpiece (in the image being tested) is based its level of
similarity to the reference image.)
It is also possible to make matching decisions about images which have undergone
binary conversion.
Checking the positional deviation of labels, checking for the wrong part or other
foreign objects mixing in with the desired parts, checking for sufficiently high
precision in the mounting of electrical components on PC boards, checking for
misprints, check for missing electrical parts such as terminals, and simple inspection
of lettering.
[Checking for label misalignment]
· Checking sequence
1
Conduct a gray scale search of the image used to establish the position.
2
Using the image coordinates obtained in step
1
, first, adjust the position of
the new image and then begin the matching process.
3
If the level of match between the images is too low, then a "label NG" decision
will result.
Image used to
establish the
position
Image used to
establish the
position
9-4 Degree of match inspection for shape and size
