Edge Detection - Sharp IV-S30 User Manual

Setting Measurement Conditions

(8) Edge detection

The "edge" refers to the boundaries between the brighter (white) and darker (black) parts in an
image. The "edge detection" function is used to detect this boundary by processing the image.
Ë Ë Ë Ë Ë An example of detecting a point using the edge detection function and user specified criteria
- Horizontal transition point
from light to dark (moving
3
from left to right)
Edge detection point
Detection direction
- Horizontal transition point
from light to dark (moving
from right to left)
Detection direction
- Center (dark), horizontal (left and right)
- Edge detection of the inside and outside edges of a two circles
A: Moving right horizontally
from light to dark
- The edge detection point coordinates are used as a reference point to detect an out of position
condition.
- Edge detection in binary images is much quicker than in a gray scale search. However, the binary
image detection process is less precise at detecting position.
Ë Ë Ë Ë Ë Setting the threshold value automatically
By executing an "AUTO.REGI" (automatic setting) for the edge detection condition in each
measurement program, the IV-S30 can automatically detect edges in the measurement areas, and
set the optimum threshold values automatically (density difference and edge width).
- Edge detection condition menu for lead inspection
1REGISTER NO.
2DTCT SHAPE
3SEARCH ARE
4DTCT MODE
5SEARCH DIR
6AUTO.REGI
7THRESHOLD
- Vertical transition point from
light to dark (moving from top
to bottom)
Detection area
A B
- Vertical transition point from
light to dark (moving from
bottom to top)
Detection area
A B
Edge detection
point
Edge detection point
Detection area
B: Moving right horizontally
from dark to light
Detection area
0(0~15)
RECT(ARTIFACT) LINE CIRC.L
MOVE UP.L(224,208) LO.R(287,271)
CENTR(BRT DRK)
HOLIZ(
EXEC
GRYS.050(0~255) EDGE.W2(1~8)
FLAT.W04(1~16)
Edge detection
Light
point
A
Brightness
level
Dark
B
Light
A
Brightness
level
B
Dark
C: Moving left horizontally
from dark to light
) VERT( )
3-12
Edge Flat
width width
Difference
in level
A Direction B
Edge Flat
width width
Difference
in level
A Direction B
D: Moving left horizontally
from light to dark
Internal diameter (between B and C)
External diameter (between A and D)