Sharp IV-S30J User Manual page 59

Setting Measurement Conditions
(5) Binary processing (fixed/threshold value correction)
By setting THRESHOLD-ADJ (threshold adjustment function), the IV-S30 can cope with variations in
lighting.
3
Threshold correction value
Threshold correction using either VAR-DIFF (enter variations in lighting as value) and
VAR-RATE (enter variations in lighting as a rate) can be selected the THRESHOLD-ADJ
(the threshold adjustment function).
Set (selection) item
Threshold value
adjustment
Measurement programs which are affected by these settings
Area measurement by binary conversion, object counting by binary conversion, object
identification by binary conversion, point measurement (binary images)
Setting method
Select "
screen and then change the upper and lower
limit values using the up, down, left, and right
arrow keys.
Fails to convert the image
due to a variation in lighting
Correct the threshold value by adding the previously specified threshold
Variation
value to the light level variation difference.
difference
(Measured light level — reference light level) + specified threshold value
Correct the threshold value by multiplying the previously threshold value
Variation
to the light level variation rate.
rate
(Measured light level ÷ reference light level) x specified threshold value
THRESHOLD" on the "REG COND"
(threshold adjustment
function), the monitor brightness
functions must be selected to
measure variations in lighting. If
Fixed
you don't select the monitor
brightness function, a LIGHT LVL
NOT SET (correcting binary value:
monitor illumination not selected)
error will occur.
Details of correction
REG COND SCREEN COND SAVE DETAIL
1MEAS SHAPE
RECTANGLE
2MEAS AREA
SET (224,208)~(287,271)
3THRESHOLD
SET [U.LM255 L.LM100(0~255)]
4INVERT B/W
NO
Change using the up and
down arrow keys.
3-12
F C1 BRT