Degree Of Match Inspection For Shape And Size - Sharp IV-S20 User Manual

9-4 Degree of match inspection for shape and size

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.
Purpose
(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
Applica-
precision in the mounting of electrical components on PC boards, checking for
tions
misprints, check for missing electrical parts such as terminals, and simple inspection
of lettering.
[Checking for label misalignment]
Example
· 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
3 If the level of match between the images is too low, then a "label NG" decision
Search area used to
establish the position
Image used to
establish the
position
SERIAL NO.
8F053G26
MODEL
IV - S20
New image to
be checked
Good label
the new image and then begin the matching process.
will result.
Image used to
establish the
position
New image to
be checked
NG label
9·45
Degree of match inspection
Search area used to
establish the position
9